Overview of Concrete Additives
Concrete additives also referred to as concrete admixtures, refer to the material added to improve and adjust the performance of concrete. Concrete admixtures are chemical additives or mineral additives added during concrete mixing to enhance specific properties of the fresh or hardened concrete, such as workability, durability, or early and final strength. They can either be liquid or powdered additives. The amount of concrete admixture is generally not more than 5% of the cement quality. Because concrete admixture can improve the performance of concrete effectively, and has good economic benefit. It has been widely used in many countries and has become an indispensable material in concrete.
1. Improve the performance of concrete: The use of admixtures can improve the working performance of fresh concrete, improve the mechanical properties of hardened concrete, and improve the durability of concrete.
2. Save cement: The use of admixtures can reduce the water consumption of concrete and save cement, thereby reducing project costs.
3. Adjust the setting time: The use of admixtures can adjust the setting time of concrete to make it more suitable for construction needs and improve construction efficiency.
4. Improve rheological properties: The use of admixtures can improve the rheological properties of concrete, making it easier to construct and operate.
5. Environmental protection: The production and use of admixtures will not have a negative impact on the environment and comply with environmental protection requirements.
Construction field: In the construction field, concrete additives are mainly used to improve the performance of concrete and improve the quality of projects. For example, water-reducing agents can reduce the water consumption of concrete and improve its strength and durability; air-entraining agents can introduce tiny bubbles into concrete to improve its crack resistance and impermeability.
concrete in construction field
Bridges and highways: In these areas, concrete additives are mainly used to improve the durability and stability of concrete. For example, waterproofing agents can increase the impermeability of concrete, giving it better durability in underwater or underground projects; retarders can extend the initial setting time and final setting time of concrete, making it more suitable for construction needs.
concrete bridges and highways
Airport and railway areas: In these areas, concrete additives are mainly used to improve the quality of projects. For example, accelerators can harden concrete quickly and shorten construction time; thickeners can increase the viscosity of concrete, making it more uniform and reducing segregation and bleeding.
concrete in airport and railway areas
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1) Store in a dry environment at room temperature.
2) Avoid damp and high temperature.
3) Use immediately after opening the inner packing bag.
What is the classifications of concrete additives?
1. Additives to improve the variable performance of concrete mixing. Including a variety of water-reducing agents, air-entraining agents and pumping agents.
2. Adjust the concrete setting time, hardening performance admixture. Including retarding agent, early strength agent and accelerating agent.
3. Additives to improve the durability of concrete. Including air entrainment agent, waterproof agent and rust inhibitor.
4. Additives for improving other properties of concrete. Including aerating agent, expansion agent, colorant, antifreeze, waterproof agent and pumping agent .
What are the usage of concrete additives?
1. Can reduce the water consumption of concrete. Or you can increase the fluidity of concrete without increasing the amount of water used.
2. You can adjust the setting time of concrete.
3. Reduce concrete bleeding and segregation. Improved workability and water panning resistance.
4. Slump loss can be reduced. Increase permeability of pumped concrete.
5. It reduces shrinkage. The addition of an expansion agent can also compensate for shrinkage.
6. Delay the initial hydration heat of concrete. Reduce the temperature rise speed of mass concrete and reduce the occurrence of cracks.
7. Improve the early strength of concrete. Prevents freezing at negative temperature.
8. Improve strength, increase frost resistance, permeability resistance, wear resistance, corrosion resistance.
9. Control alkali-aggregate reaction. Prevent steel corrosion, reduce chloride ion diffusion.
10. Make concrete with other special properties.
11. Reduce the viscosity coefficient of concrete.
Which concrete additives are commonly used in bridge construction?
Water reducing agent: It can reduce the viscosity and internal friction of concrete, reduce the separation, precipitation and bleeding of concrete, and improve the uniformity and stability of concrete. In bridge construction, water reducing agents can effectively improve the construction efficiency and quality of concrete, especially during concrete preparation, mixing and transportation.
Retarder: It can delay the peak period of hydration heat and improve the workability of concrete, and reduce the water-cement ratio to achieve the purpose of reducing hydration heat. In bridge construction, retarder is mainly used for long-term construction projects, such as large-volume concrete pouring.
Expansion agent: It can produce a large number of bubbles in concrete, thereby improving the fluidity of concrete and reducing the shrinkage of concrete. In bridge construction, expansion agents can be used to create high-strength, high-durability concrete structures.
Waterproofing agent: Prevents moisture from penetrating into the concrete, thereby improving the durability of the concrete. In bridge construction, waterproofing agents can be used in the construction of various concrete structures, such as piers, beams, etc.
What additives can be used to increase the strength of concrete?
Expansion agent: It can replace cement in equal amounts and cause moderate expansion of concrete. On the one hand, it ensures the density of concrete, and on the other hand, it generates pressure inside the concrete to offset the partial tension generated in large-volume concrete such as bridges and dams. stress.
Chloride ion-based concrete super early strength agent: The main component is chloride ions, which react with water to produce calcium hydroxide and calcium chloride, thus improving the strength of concrete.
Micro-bead concrete super early strength agent: The main component is micro-beads, which improve the strength of concrete by forming a certain pore structure in the concrete.
What are cement enhancers?
Cement enhancer is a chemical additive used to improve the performance of cement. It can chemically react with cement to form a denser and denser building material structure, thereby improving the tensile strength, compressive strength and wear resistance of cement. characteristic. Common ingredients of cement reinforcements include polymers, polymer compounds, nanomaterials, etc., which can form a new three-dimensional network structure in cement to enhance the strength and durability of cement.
According to different application requirements and technical characteristics, how many categories of cement reinforcements can be divided into?
Silicate reinforcing agents: This type of reinforcing agent generates C-S-H gel through chemical reaction with cement to form a hardening system, which can significantly improve the strength, tightness and durability of cement products. 2
Siloxane enhancer: This enhancer can form a hydrophilic siloxane layer on the cement surface, which helps prevent the loss of water in the cement and plays a catalytic role in the hardening process. It is especially suitable for High fluidity concrete, self-leveling cement and high temperature resistant cement, etc.
Nano-silica: As a new type of cement enhancer, nano-silica has a particle size of less than 100nm. It can strengthen the internal structure of cement and improve the strength and durability of cement. It is suitable for use in high-performance cement products and high-strength concrete.
Carbon fiber: Carbon fiber is a high-strength material that, when used as a reinforcing agent, can improve the tensile strength and durability of cement products. It is especially suitable for the production of cement boards, cement pipes, cement beams and other products.
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