Foam concrete is a kind of concrete with lightweight and has ideal strength. Because of the hollow structure in foam concrete, it has the function of absorbing heat and isolating sound.
The density of foamed concrete is 300-1200 kg/m3, and the thermal conductivity is between 0.08-0.3W/ (m ·K).
Foam concrete is widely used in CLC blocks, lightweight partition panels, roof insulation, floor cushion construction, floor heating backfilling, and other occasions.
At the same time, foam concrete is also a good sound absorption material, which can be used in highway sound insulation boards, sound absorption boards, and other fields.
Generally speaking, foam concrete is a kind of building material with multi-function, environmental protection, and economy, which has a wide application prospect.
Concrete superplasticizer is an admixture widely used in the manufacturing and constructing of concrete, also known as high-efficiency superplasticizer or high-performance superplasticizer. Its main function is to reduce the water demand of concrete while improving its fluidity, water retention, and stability. This article will briefly introduce the mechanism, performance characteristics, usage precautions, and development prospects of concrete superplasticizer.
The main mechanism of concrete superplasticizer is to improve the fluidity, water retention, and stability of concrete by adsorbing and dispersing cement particles. Specifically, the polar groups in the superplasticizer molecules will adsorb on the surface of cement particles, causing them to charge and generate electrostatic repulsion, thereby expanding the distance between cement particles and reducing the viscosity of concrete. At the same time, the molecular structure of the superplasticizer also contains non-polar groups, which can form steric hindrance, further preventing the aggregation of cement particles and improving the fluidity of concrete.
Reducing water consumption: Concrete superplasticizer can significantly reduce the water consumption of concrete, thereby improving its strength and durability.
Improving fluidity: Concrete superplasticizer can improve the fluidity of concrete, making it easier to pour and pump.
Enhancing water retention: Concrete superplasticizer can enhance the water retention of concrete, prevent rapid evaporation of water, and thus improve concrete's crack resistance and durability.
Improving stability: Concrete superplasticizer can enhance the stability of concrete and prevent phenomena such as layering and segregation.
Choose appropriate types and dosages of superplasticizer: Different types and dosages of superplasticizer will have different effects on the performance of concrete, so it is necessary to choose according to the needs of the project.
Pay attention to the mix ratio and mixing time: When using superplasticizer, it is necessary to operate according to the specified mix ratio and mixing time to ensure the quality of concrete.
Pay attention to the influence of weather and temperature: The effect of superplasticizer is greatly influenced by weather and temperature, so it is necessary to adjust the dosage when used in high temperature or dry environments.
Strengthen quality control: When using superplasticizer, it is necessary to strengthen quality control and conduct strict quality testing on raw materials and finished products to ensure product quality.
A: Pot sticking phenomenon: Part of the cement mortar adheres to the wall of the mixer cylinder, causing uneven and less ash in the discharged concrete, resulting in concrete sticking.
Reason analysis:
Concrete sticking often occurs after adding retarders and superplasticizer or in drum mixers with similar axial diameter ratios.
Solution:
(1) Timely pay attention to cleaning and removing remaining concrete;
(2) First, add aggregate and some water to mix, then add cement, residual water, and superplasticizer to mix;
(3) Use a large shaft diameter ratio or forced mixer.
B: False setting phenomenon: After being discharged from the machine, the concrete quickly loses its fluidity and cannot even be poured.
Reason analysis:
(1) Insufficient content of calcium sulfate and gypsum in cement leads to rapid hydration of calcium aluminate;
(2) The superplasticizer has poor adaptability to this type of cement;
(3) When the content of triethanolamine exceeds 0.05-0.1%, the initial setting is rapid but not the final setting.
Solution:
(1) Change the type of cement;
(2) If necessary, adjust the admixtures and carry out reasonable compounding;
(3) Add Na2SO4 component to the admixture.
(4) Reduce mixing temperature
C: Non setting phenomenon: After adding a superplasticizer, the concrete has not been set for a long time, even day and night, or the surface exudes slurry and turns yellow-brown.
Reason analysis:
(1) Excessive dosage of superplasticizer;
(2) Excessive use of retarders.
Solution:
(1) Not exceeding 2-3 times the recommended dosage, although the strength has slightly decreased, the 28-day strength reduction is less, and the long-term strength reduction is even less;
(2) After final setting, appropriately increase the curing temperature and strengthen watering and curing;
(3) Remove the formed part and pour it again.
D: Low strength phenomenon: The strength is much lower than the test results of the same age, or although the concrete has set, the strength is extremely low.
Reason analysis:
(1) Excessive addition of air entraining superplasticizer results in excessive air content in concrete;
(2) Insufficient vibration after mixing with air entraining superplasticizer;
(3) Not reducing water or increasing water cement ratio instead;
(4) Increase the amount of triethanol added.
Solution:
(1) Adopting other reinforcement measures or repouring;
(2) Strengthen post pouring vibration;
(3) Take measures to address the reasons mentioned above.
E: Rapid loss of slump: Concrete quickly loses its workability. After being discharged from the tank every 2-3 minutes, the recession decreases by 1-50 mm, and there is a significant phenomenon of sinking to the bottom. High-slump concrete is more prone to this phenomenon.
Reason analysis:
(1) Superplasticizer have poor adaptability to the cement used;
(2) The bubbles introduced into the concrete continuously overflow, causing water evaporation, especially when using air entraining superplasticizer;
(3) High concrete mixing temperature or environmental temperature;
(4) The slump of concrete is very high.
Solution:
(1) Find the cause and take measures to address it;
(2) Using the post mixing method, the superplasticizer is added 1-3 minutes after mixing the concrete or even before pouring and then remixed;
(3) Be careful not to add water.
F: Settlement joint: After pouring, there will be several short, straight, wide, and shallow cracks in the concrete before and after the initial setting.
Reason analysis:
After adding superplasticizer, the concrete is more dense, does not bleed, and is not easy to completely settle, often appearing above the steel bars;
Solution:
Apply pressure to the cracks before and after the initial setting of the concrete until they disappear.
With the rapid development of the construction industry and the popularization of green building concepts, the application prospects of concrete superplasticizer are becoming increasingly broad. In the future, concrete superplasticizer will develop towards high-performance, low dosage, and environmentally friendly directions. At present, researchers are developing a new generation of superplasticizer products, with a focus on improving the water reduction rate and enhancing water retention while reducing the impact on the environment. In addition, with the development of emerging technologies such as 3D printing, the application field of concrete superplasticizer will also be further expanded.
TRUNNANO is a supplier of CLC concrete with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Antifreeze is widely used in foam concrete to enhance its performance in cold conditions. Because in winter, foam concrete may be affected by freezing, resulting in its performance degradation. This article will discuss in detail how to use antifreeze in winter foam concrete.
According to its mechanism of action and effectiveness, antifreeze can be divided into the following categories:
Early strength antifreeze: mainly used to quickly improve the early strength of concrete and reduce its freezing point. It is an antifreeze agent that promotes the strength development of concrete within a certain period, which can quickly achieve the goals of protection, corrosion prevention, and fast hardening, and self-supporting. It also has good self compacting performance and pumpability, and the product has better water reducing performance. This type of antifreeze can be used in combination with other polycarboxylic acid series superplasticizers. Early strength antifreeze is a type of concrete admixture selected in areas where the daily minimum temperature does not exceed -10 ℃. It has characteristics such as early strength, water reduction, antifreeze, and reinforcement.
Efficient antifreeze: It has a long shelf life and is suitable for concrete that is exposed to low temperatures for a long time. This type of antifreeze meets the strength performance requirement when its strength is measured to be 1% -1.5% higher than the sequential limit strength within the specified age. It should have performance characteristics such as efficient water reduction, reinforcement, air entrainment, and nitrite composition.
Composite antifreeze: Combining the advantages of early strength and high efficiency, it can quickly improve early strength and effectively prevent freezing in the long term. Composite early strength and high-efficiency antifreeze have the characteristics of early strength, high water reducing ability, retarding setting, and plastic preservation. It can improve the early and late strength of concrete while reducing the critical water content. Therefore, it can be used as a protective variety under critical and above environmental conditions, and its impermeability, water resistance, and adhesion to formwork have also been improved, especially suitable for various types of concrete projects poured under harsh conditions.
When using antifreeze in foam concrete in winter, we need to follow the following steps:
Choose the appropriate type of antifreeze: Select the corresponding type of antifreeze based on the climate conditions and engineering needs of the project location. Specifically, the type of antifreeze required can be decided based on elements such as the location of use, pouring time, curing conditions, and minimum temperature of the concrete.
Determine the dosage of antifreeze: The required dosage varies for different engineering needs and types of antifreeze. The specific amount required should be determined based on the actual situation and engineering needs. Generally, the amount of antifreeze required for foam concrete in winter should be within the appropriate range, and too much or too little will have adverse effects on the performance of concrete.
Evenly mixing: Add antifreeze into foam concrete according to the specified proportion and fully mix evenly. This ensures that all materials can be fully mixed and evenly distributed without local aggregation or uneven concentration. In order to achieve uniform mixing, mechanical mixing or manual mixing can be used for operation.
Transportation and storage: Since antifreeze is added to foam concrete, special attention shall be paid to waterproof, moisture-proof and sunscreen measures during transportation and storage. In addition, it is also necessary to ensure that the materials used comply with relevant standards and that the storage time should not be too long to avoid affecting the quality and effectiveness of the materials.
On site pouring and curing: During the pouring process, attention should be paid to controlling the temperature and humidity of the concrete to ensure its stability. After the pouring is completed, appropriate maintenance operations should also be carried out, such as covering insulation materials and regularly watering to ensure the quality and stability of the concrete.
Result testing: After using antifreeze, the performance of concrete should be tested, such as whether its compressive strength, flexural strength, thermal conductivity, and other indicators meet the expected requirements. If the test results don't satisfy the specifications, then remedial actions should be implemented promptly, or pouring operations must be repeated.
A bridge project was constructed in a city in winter. Considering the low temperature in winter, in order to ensure the quality and stability of foam concrete, it was decided to add an appropriate amount of antifreeze to foam concrete. The specific implementation steps are as follows:
Choose the appropriate type of antifreeze: In light of the fact this project situated in the northern region of the country, with lower winter temperatures and longer duration, high-efficiency antifreeze was ultimately chosen.
Determine the amount of antifreeze: According to the experimental comparison results and project needs, the amount of antifreeze is finally determined as 5 kg per cubic meter of foam concrete.
Evenly mixing: Add antifreeze into foam concrete in proportion and fully mix it evenly with mechanical mixing equipment.
Transportation and pouring: The mixed foam concrete is then transported to the construction site via special transport vehicles that are designed for pouring. Strictly control the temperature and humidity of the concrete during the pouring process to ensure its stability.
On site maintenance: After pouring is completed, cover and moisturize the concrete, and take measures such as regular watering to ensure the quality and stability of the concrete. After a winter's use and test, it was found that the quality of foam concrete in the bridge project is stable and reliable and has good compressive strength and flexural strength and other performance.
TRUNNANO is a supplier of foam agents with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Cement foaming machine is a kind of equipment that mixes foaming agent and cement slurry to prepare foam concrete. Its working principle is to introduce air into the foaming agent aqueous solution and form foam through high-speed mixing, foaming and other processes. Then, these foam are mixed with cement slurry to prepare foam concrete.
Cement foaming machine and cement foaming agent are technical systems that cooperates and cannot function independently. No one can do without each other. Between the two, it cannot be said who is the main or who is not the main, but their role is quite equivalent. Without the cement foaming agent, the cement foaming machine will not produce foam and will lose its value of existence.
Similarly, without a foaming machine, no matter how good the foaming agent is, it cannot become a foam, and its use will be lost. The cement foaming machine adopts intelligent control, integrating a hydraulic system, quantitative feeding system, mixing system, automatic foaming system, and digital control system. The produced foam cement bubbles are fine and uniform, and the density can be continuously adjusted according to needs. Customers highly praise its technical performance and stability. In recent years, with the development, large cement foaming machines, also known as foam light soil operation stations, can be used for filling at the bridge head and back of expressway; Soft roadbed replacement; Widening of highways, etc. Fast speed and large daily completion quantity.
Regardless of the type of cement foaming machine, the basic principle of being able to foam is to introduce the air into the foaming agent solution. The changes in various models are due to the different ways in which gas is introduced, resulting in different effects.
There are two necessary elements for the formation of foam: the first one is the foaming agent solution, and the other one is air, both of which are indispensable. The liquid film bordering the gas will certainly not develop without a frothing agent service, and there will be no bubbles.
In the foaming formation system, the foaming agent solution is a dispersion medium, and the gas is a dispersion phase. Only when the gas is dispersed in the liquid can bubbles be formed, and then countless bubbles form foam. Along with the substantial factor of lathering agent performance, the intro of gas right into the frothing agent remedy is the various other essential components. A foaming machine must complete the introduction of it into the liquid. Different foaming generators have different methods of introducing gas. Overall, there are several methods for introducing gas into foaming machines.
It is a technique of directly presenting gas into mortar (or concrete slurry) mixed with lathering agents. When the mixer blades push the slurry, air enters the slurry with the mixer blades. Furthermore, a big quantity of air is wrapped in the slurry when the slurry is turned, and a section of the air is brought into the slurry by cement and accumulations. The amount of the 3 is the complete amount of air entering the slurry. Among them, the air brought into the slurry by the mixing blades and the air wrapped in the slurry by the turning blades represent the majority.
After the air gets in the slurry, a liquid having frothing representative surfactants borders the air, developing a double electron layer fluid movie at the interface in between the air and the fluid, and inevitably creating bubbles in the slurry in a liquid to air way.
As a result of the slow-moving turning speed of the blades and the introduction of less gas in this method, the amount of bubbles created is tiny, resulting in bad frothing effect and reduced effectiveness.
It is a method of introducing gas into the foaming agent solution through high-speed rotating blades. The introduction of gas mainly relies on the force of rotating blades. The blades of this model generally require high-speed rotation, with a speed greater than 700 rpm, typically between 700 and 1400 rpm. The circumferential speed at the end of the impeller should be>20m/s to achieve satisfactory results. A certain high speed is necessary to expose the impeller to the liquid, come into contact with air, and introduce air. The speed can not be too low. Otherwise, the impeller will not be exposed to the liquid, and the air intake will be really reduced. The appropriate rotational speed should be such that the impeller is exposed during liquid rotation.
The basic principle of impeller bleed is as follows:
When the impeller rotates at high speed, it drives the foaming agent solution inside the foaming cylinder to rotate, forming a rolling circular flow and generating a large vortex. At this point, the gas-liquid two-phase particles located at the gas-liquid interface at the top of the foaming agent solution will accompany each other and rapidly spiral down to the bottom of the vortex, forming a turbulent zone at 2.5-5 cm from the edge of the impeller. In this region, gas-liquid two-phase particles are subjected to strong shear and impact effects from the impeller, dispersing into small dispersions, quickly achieving gas-liquid mixing, evenly dispersing the gas in the liquid, and achieving the introduction of gas. The efficiency of its introduction is related to various technical factors such as rotational speed, impeller diameter, distance between the impeller and the foam cylinder, and the shape of the impeller blades. It is not determined by a single rotational speed. High speed impellers all have an air entrainment effect, but their efficiency, effectiveness, and energy consumption are different.
This is the most widely used advanced air entraining foaming method at home and abroad in 2021. It is also a more scientific air entraining method and is the core technology of high-pressure and medium pressure foaming machines for foam concrete.
Both technologies stated above are slow-moving, irregular, and have huge bubble diameters, especially the irrepressible bubble diameter, which is entirely according to the randomness of the foaming device and can not guarantee the two most important technological indicators of tiny bubble size and consistent foam.
In order to effectively solve these problems, the method of pressure induced foaming has emerged. Whether from the foaming amount, foaming speed, foam diameter, foam evenness, etc., they have reached a new level and made great technical progress. Its primary principle is to make use of different devices that can produce air pressure to press air right into the liquid stage and attain uniform mixing of both stages. Under normal pressure, it is difficult for air to enter a fluid, yet under a certain stress, it comes to be simpler. This atmospheric pressure not only presses the gas into the fluid but also the liquid into the gas, which is, in fact, a dual phase synchronized application of stress. By doing this, the blending of both stages will certainly be quick, effective, and consistent, and the bubbles will be small, satisfying the technical demands of foam.
There are mainly two types of pressure equipment used in China: one is an air compressor and the other is a blower. The air compressor produces high pressure, while the blower produces medium to low pressure. Therefore, the foaming effect of the air compressor is better, while the foaming effect of the blower is slightly worse. Those that use an air compressor for foaming are called high-pressure foaming machines, while those that use a blower for foaming are called medium and low pressure foaming machines. The quality of air compressor foaming mainly controls its pressure and exhaust volume, while the blower foaming mainly controls its air pressure and air volume.
Due to the good foaming effect of air compressors, most foaming machines in China use air compressors. There are also many applications of blower foaming in China, but compared to high-pressure foaming, this foaming method is still relatively rare. The foam produced by high-pressure air foaming has a low water penetration rate, small bubble diameter, fine and uniform, and high quality. The foam produced by air blowing is slightly larger in bubble diameter, and its overall quality is inferior to high-pressure foaming.
This is a foaming method that was attempted from 2015 to 2021 but has not yet been widely used. Its basic principle is to use the strong dispersion force generated by the jet to realize the instantaneous large surface contact between the gas phase and the liquid phase so that they can be evenly mixed and form foam with liquid wrapped gas. This method does not show any more advantages than high-pressure air foaming, and further exploration and improvement are needed.
There is a wide variety of foaming devices appearing in the marketplace, with a growing number of foaming devices of numerous brand names, shapes, and names every day. Moreover, new brands and names of foaming machines will continue to increase. With so many models, many people are at a loss when choosing, even looking at it with confusion, not knowing how to make a choice, to the extent that they may even choose the wrong model or choose a model that does not meet technical requirements. In order to facilitate the correct selection of the foaming machine, the selection method is introduced below.
This is the most important question to clarify when choosing a foaming machine. The foaming principle of each type of foaming machine is not entirely the same. Still, roughly speaking, there are several types of principles we discussed in the second section of this chapter, and their basic principles are mostly within this range, which can be compared and referenced.
Understanding the foaming principle of a foaming machine is of great help in further understanding its technical characteristics and performance. Different foaming principles have different equipment structures and performances. By understanding its foaming principle, one can have an overall grasp of this foaming machine and understand the overall direction of selection. This can determine that you won't make a big mistake when choosing. For example, you know that a certain model has high-speed impeller air entrainment. According to the principle we introduced earlier, you can preliminarily know that the foam produced by this foaming machine cannot be uniform in size.
Many foaming machine manufacturers treat the foaming principle as a technical secret, keeping inspectors unaware and habitually letting them see through the fog. In fact, it is completely unnecessary to keep it confidential. The foaming principle is not equivalent to being the structural secret of the foaming machine. Many people have learned about the foaming principle during inspection, and it is impossible to understand its entire structure. Therefore, it is entirely possible and necessary for the buyer to understand the foaming principle of the foaming machine during inspection without affecting the confidentiality of the core technology. This is not only responsible for the buyer but also for their own reputation.
No matter how many brands and names there are, in the final analysis, there are only three types of foaming machines: low-speed stirring type, high-speed impeller type, high-pressure, and medium-low type introduced earlier. The performance differences between different types of foaming machines are quite significant. Understanding its model categories is crucial for gaining a deeper understanding of its performance. Knowing the type of foaming machine, even if the manufacturer does not introduce its technical features (advantages, disadvantages, and scope of application), you can still have a clear understanding and understand it 60 to 70%. It is very important for accurately selecting the model.
Recognizing the version is a detailed understanding, not a particular understanding. On this basis, one is required to even more understand numerous important technical criteria of the foaming equipment to determine whether it is appropriates for one's own manufacturing needs.
Return. Its output is the quantity of foam created, which has to be somewhat greater than its very own foam needed by 20% to leave the area. The foam production should be calculated based upon the complying with restrictions, not the upper limit;
Installed ability. To determine the versatility of one's electrical circuit to total power consumption;
Tools size. To identify the height and location of the workshop;
Foam diameter array. Normally, contrasts need to be made based upon the demands of one's very own item for bubble dimension;
4) Carefully recognize the frothing high quality and confirm that the utmost product of the frothing equipment is foam based on the field test.
The foam quality is the standard to evaluate the performance of the gathering device, and recognizing various other elements likewise serves this objective. If the high quality of foam is poor, what is using the foaming machine? To evaluate the foaming quality of the foaming device, we need to focus on complying with three elements: foam excellence, foam uniformity, and foam blood loss. Whether the foaming device can fulfill the demands of these three elements ought to be validated and verified via trial procedure.
Regular inspection: Regularly inspect all components of the cement foaming machine to ensure they are intact and undamaged.
Maintain cleanliness: Regularly clean the cement foaming machine to prevent dirt accumulation.
Lubrication: Regularly lubricate the cement foaming machine to reduce friction and wear.
Maintenance of hydraulic system: The hydraulic system is the core part of the cement foaming machine, and it is necessary to regularly check the cleanliness of the hydraulic oil and the working status of the hydraulic components. If necessary, replace the hydraulic oil and hydraulic components in a timely manner.
Adjusting and maintaining the mixing system: The mixing system is an important part of the cement foaming machine, and it is necessary to regularly check the wear of the mixing blades. If necessary, replace the worn blades in a timely manner. At the same time, adjust the balance of the mixing shaft to avoid vibration and noise during the mixing process.
Check the air circuit system: The air circuit system is an auxiliary part of the cement foaming machine, and it is necessary to regularly check the sealing of the air circuit and the stability of the air pressure. If necessary, timely repair leaks and adjust the air pressure.
Maintenance of electrical system: The electrical system is the control part of the cement foaming machine. It is required to regularly check the working condition of electrical elements and the insulation of wires. If necessary, replace damaged electrical components and wires in a timely manner.
Keep records: After each maintenance, relevant maintenance data and problem descriptions should be recorded in a timely manner for future reference and troubleshooting.
TRUNNANO is a supplier of CLC concrete with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Concrete admixtures are chemical substances added during the mixing process of concrete aimed at improving the physical, chemical, or mechanical properties of concrete. These admixtures can enhance the strength, durability, flowability, and impermeability of concrete to meet the needs of specific engineering projects.
Concrete admixtures are mainly divided into the following categories:
Improving flowability: Such as air entraining agents, water reducing agents, pumping agents, etc., which can maintain good workability of concrete while reducing water consumption and improving flowability.
Adjusting the setting time and hardening speed：Such as retarders, accelerators, etc., can control the initial and final setting time of concrete to meet the construction needs in different environments.
Improving durability: Such as waterproofing agents, antifreeze agents, impermeable agents, etc. These admixtures can enhance the frost resistance, impermeability, corrosion resistance, and other properties of concrete, extending the service life of the structure.
Enhance mechanical properties: Such as early strength agents, reinforcing agents, etc., which can improve the early strength of concrete to meet the high requirements for structural strength in engineering.
The main functions of concrete admixtures are as follows:
Improving the mix ratio of concrete: By reducing water consumption and increasing orthopedic content, the strength and durability of concrete can be improved.
Enhance the physical properties of concrete：such as impermeability, frost resistance, crack resistance, etc., to improve the durability and service life of concrete.
Adjusting the hardening rate of concrete: By adding retarders or accelerators, it can adapt to different construction environments and requirements.
Improving the construction performance of concrete: Air entraining agents and pumping agents can improve the pumping performance of concrete and facilitate construction operations.
Enhancing the mechanical properties of concrete: early strength agents and reinforcing agents can improve the early strength and durable strength of concrete.
Concrete admixtures are widely used in various civil engineering projects, such as buildings, bridges, tunnels, roads, etc. Its application areas include:
Building structure: A large amount of concrete admixtures are used in the beams, slabs, columns and other structures of buildings to improve the strength, durability, and impermeability of concrete.
Bridge engineering: In bridge construction, admixtures can improve the performance of concrete and increase the bearing capacity and service life of bridges.
Tunnel engineering: In tunnel construction, the use of admixtures can improve the impermeability and durability of concrete, ensuring the long-term stability and safety of the tunnel.
Road engineering: In road construction, admixtures can improve the crack resistance and wear resistance of concrete and extend the service life of roads.
Other fields: In addition to the fields above, concrete admixtures are also widely used in water conservancy engineering, port engineering, and other fields, providing efficient, energy-saving, and environmentally friendly building material solutions for various civil engineering projects.
Because the quality of commonly used raw materials for ready-mixed concrete fluctuates greatly, it is impossible to ensure smooth production and manufacturing. Therefore, adjusting the mortar mix ratio is indispensable and crucial. The adjustment method of mortar mix proportion during the processing process should be formulated based on the trial results to ensure that it is carried out within the controllable range, and authorized and professional training should be provided to relevant staff to enable authorized personnel to fully grasp the adjustment technology within the scope of management authority. Otherwise, mindlessly following the trend to adjust the mortar mix ratio will inevitably lead to deepening fluctuations in the quality of concrete, which can easily lead to product quality problems or safety accidents.
Generally speaking, admixtures have no special requirements for concrete mix proportions and can be designed using ordinary methods. However, in the case of reducing the water or saving cement, appropriate adjustments should be made to the sand rate, cement dosage, water cement ratio, etc.
1. Sand rate
The sand content has a significant impact on the workability of concrete. Due to the significant improvement in workability after the addition of water reducing agents, the sand content can be appropriately reduced by 1% -4%. For example, the lower limit for wood calcium can be 1% -2%, and the upper limit of air entraining water reducing agents can be 3% -4%. If the sand rate is too high, the reduction can be increased because high sand rates not only affect the strength of concrete but also bring certain difficulties to the molding operation. The specific ratio should be determined by the trial results.
2. Cement dosage
The use of water reducing agents in concrete has varying degrees of cement saving effects. The use of ordinary water reducing agents can save 5% -10%, while efficient water reducing agents can save 10% -15%. Using high-strength grade cement to prepare concrete and adding water reducing agents can save more cement.
3. Water cement ratio
The water cement ratio of concrete with water reducing agents should be determined based on the water reducing rate of the added variety. Originally, the water reduction rate was higher for those with a higher water cement ratio than for those with a lower water cement ratio. After saving cement, in order to maintain the same slump, the water cement ratio is the same or increased by about 0.01-0.03 compared to when no cement is saved.
TRUNNANO is a supplier of concrete admixtures with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
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