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.
After reading the following story, you will know how important it is to use cement anti-cracking agent to prevent foam concrete from cracking.
4 years! The cracked apartment incident in Australia continues! No one can live there, so we must still pay property fees! Chinese property owners have difficulty safeguarding their rights. They spent $2 million to buy a house 2 months before the incident...
I don't know if you still remember: In 2019, it was revealed that 130 apartments had cracks, causing hundreds of owners to be evacuated. Now, 4 years later, the house is still uninhabitable, and the money that should be paid is still being paid. A retired couple spent $1.1 million to buy one of the apartments as their retirement residence. However, they have not moved in yet after four years of purchase. Not only that, many Chinese were also affected - they spent $2 million to buy apartments two months before the incident. Although the problem has been assessed and confirmed, the road to rights protection is very difficult...
In June 2019, more than 100 residents of Mascot Towers in Sydney were evacuated overnight due to the discovery of cracks.
After a series of investigations, more than 130 apartments in the apartment building were found to have cracks and were currently uninhabitable.
Even so, the residents still have to pay every penny they should pay. In 2023, the apartment is supported by steel and iron frames, and the owners can only find other places to live. This includes Veronica and Cliff Baker. In 2008, they spent all their superannuation money and paid $1.1 million for a three-bedroom apartment in Mascot Towers.
I originally planned to use this as my retirement residence, but the apartment cracked. The house is uninhabitable, and they still have to pay property fees. "The property fees we pay every quarter range from $2,500 to $8,000." This includes a monthly fee of 12.5% of the total $15 million the owner sued the developer. Before the incident, the value of their apartment had risen to over $2 million.
Matthew Harris is also an affected owner. He bought a two-bedroom apartment in the tower for $560,000, but now he can no longer live in it, and he still has to pay $3,000 in property fees every quarter.
"If this thing hadn't happened, the value of this apartment would be over a million now. Now that I can't live in it and can't rent it, it isn't very helpful. I'm willing to sell it for A$1 to get myself out of this trouble. ." "We have already sued those who should be sued, and the government is our last hope."
The two people mentioned above are not the only ones affected; there are also Chinese people. Chinese owner Ding Jie bought an apartment in Mascot Towers for $200 two months before she was evacuated. She said: "Every time I pass by here, I feel sad." Another Chinese owner, Ms. Chen (transliteration, Karee Chan), was forced to move out of the apartment building when she was pregnant. Her daughter is now more than 3 years old.
And this apartment building is not the only problem that has been exposed.
First, cracks were discovered in the apartment,
Then, cracks were discovered in the basement, and a business behind them had to close down because of the cracks. The estimated repair costs were as high as tens of millions, and the owners may have to pay out of their pockets. The bank refused to extend the loan period, and due to maintenance costs, some owners were even forced to file for bankruptcy. Some owners said that because of the difficulties, at least two suicides occurred in the community, and more and more people suffered from psychological problems, family breakdown and bankruptcy. Owner Stu Carr was forced to move out because the house was cracking. He was sad every time his daughter asked questions about the house. "My daughter is only a few years old. It's hard for me to answer whenever she asks me, 'Dad,' is home still broken?'.
After the quality defects of Mascot Towers were exposed, the owner's committee and the owners held numerous meetings to safeguard their rights.
They have also held up placards and protested on the streets many times, demanding that relevant parties be held accountable. But the road to rights protection is really difficult. Owner Sheehan initially said all documents indicated no problems with the apartment building. But later, cracks began to appear in the apartment.
Mascot Towers apartment owners chose to sue. In 2020, the owners launched a lawsuit against the developer AAland'sentities Church 88, EI Australia and ACE, claiming more than $15 million.
In 2022, the owners and developers settled, but the details were not made public.
In response, the New South Wales government launched an investigation. Still, during the investigation, it was discovered that important development documents for the cracked apartment building, including the occupancy permit and completion certificate, were all "missing""
According to the latest news, today, the owner of the apartment tower will meet with the apartment's building manager to discuss relevant compensation matters.
Regarding today's meeting between relevant parties, industry lawyer Stephen Goddard said he was unsure what construction leaders could promise.
"unless the building manager has a big bag of money, I don't know what they can do. The only way to remedy this is to hold the NSW government accountable."It is reported that the government may compensate those who took out loans to buy apartments, but owners who have paid in full or have paid off their loans may not receive any compensation.
Concrete anti-cracking agent is an additive that can improve the crack resistance of concrete. It can reduce micro-cracks inside the concrete and improve concrete's load-bearing capacity, durability, and impermeability. The working principle of concrete anti-intensity agents mainly includes the following aspects:
1. Improve the fluidity of concrete
Concrete anti-cracking agents can improve the fluidity of concrete, make the concrete more uniform during pouring, and reduce voids and defects within the concrete. This can avoid over-vibration, one of the causes of cracks in concrete. Excessive vibration will cause uneven distribution of aggregates inside the concrete, causing cracks inside the concrete.
2 Reduce shrinkage inside concrete
Concrete shrinks during the drying process, which is one of the reasons why concrete cracks. Concrete anti-cracking agents can reduce the shrinkage inside the concrete, thereby reducing the cracks inside the concrete. Concrete anti-stress agents can achieve this by increasing the adhesion and elastic modulus of the cement gel inside the concrete.
3. Improve the strength of concrete
Concrete anti-stress agents can improve the strength of concrete and make it harder. This is because concrete anti-stress agents can reduce the porosity inside concrete and improve its compactness. At the same time, concrete anti-cracking agents can increase the adhesion and elastic modulus of cement gel inside the concrete, thereby improving its strength and durability.
4. Prevent dry cracking on the concrete surface
Concrete anti-stress agents can prevent concrete surfaces from drying out. The dryness of the concrete surface is mainly caused by the rapid evaporation of water on the concrete surface. Concrete anti-stress agents can slow the evaporation rate of water on the concrete surface by increasing the adhesion and elastic modulus of the cement gel inside the concrete, thereby preventing the concrete surface from drying out and cracking.
5. Improve the durability of concrete
Concrete anti-cracking agents can improve the durability of concrete and make it more durable. This is because concrete anti-cracking agents can reduce micro-cracks inside the concrete and prevent the pores inside the concrete from being invaded by water, thereby reducing the possibility of concrete being eroded by water. At the same time, concrete anti-cracking agents can make the cement gel inside the concrete harder, thereby improving its durability.
TRUNNANO is a supplier of Cement Anti-crack Agent Preventing Cracks in Foam Concrete, which is concrete and relative products 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 Cement Anti-crack Agent, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Concrete accelerator is an admixture that can accelerate concrete's setting and hardening speed. It is widely used in civil engineering, water conservancy hydropower and other fields.
With the continuous development of science and technology, the research and application of concrete accelerators are also deepening. This paper will summarize the types, action mechanisms, influencing factors, and application status of concrete accelerators.
Concrete accelerators are mainly divided into two categories: inorganic salts and organic polymers.
The main components of inorganic salt accelerators are aluminate and carbonate, and their action mechanism is mainly through chemical reactions with the components of cement to form hydration products to accelerate the setting and hardening of concrete.
Organic polymer accelerators are mainly composed of polymers and amine salts, and their action mechanism is that they have high reaction activity through the adsorption of polymer chains on the surface of cement particles, thus accelerating the setting and hardening of concrete.
The concrete accelerator's action mechanism mainly includes hydration, crystallization and pozzolanic reaction.
There is a chemical reaction between the accelerator and the components in the cement to form hydration products, which will quickly form a crystal structure, which makes the concrete lose its fluidity and plasticity quickly and achieve the purpose of rapid setting.
At the same time, the accelerator will also promote the reaction of tricalcium silicate in cement with water to form calcium silicate hydrate and further accelerate the hardening of concrete.
The factors that affect the effect of concrete accelerator mainly include the following aspects: type and content of accelerator, variety and content of cement, water-cement ratio, type and gradation of aggregate, environmental temperature and humidity, etc.
Different accelerators have different action mechanisms and effects, so they must be selected according to engineering requirements and actual conditions in practical application.
At the same time, the variety and content of cement, water-cement ratio, aggregate type and gradation, and other factors will also affect the effect of the accelerator, so it is necessary to consider various factors comprehensively for optimal design.
Concrete accelerators have been widely used in civil engineering, water conservancy, hydropower, and other fields, mainly used in emergency repair, road, tunnel, and other fields.
In emergency repair projects, the concrete accelerator can effectively shorten the project period and improve the engineering efficiency; in road engineering, the concrete accelerator can improve the wear resistance and compressive strength of the pavement; in tunnel engineering, the concrete accelerator can quickly achieve the purpose of tunnel support and improve the safety and reliability of tunnel construction.
As an important admixture, concrete accelerator plays an important role in civil engineering, water conservancy, hydropower, and other fields.
With the continuous development of science and technology, the research and application of concrete accelerators are also deepening.
In the future, it is necessary to study the action mechanism further and the influencing factors of the accelerator and explore more efficient, environmentally friendly, and safe accelerator materials to meet the requirements of engineering and sustainable development.
At the same time, it is necessary to strengthen quality control and safety management in the production and use of accelerants to ensure the quality and safety of the project.
LONDON, Dec. 5, 2023 /PRNewswire/ -- Major concrete companies and cement plants such as Heidelberg, Cemex, and Holcim are leading in establishing cooperation with major architects, engineers, and construction companies. Incorporating advice from industry, the Actionable Mission Partnership has developed a new strategy that sets out the milestones and commitments required by government, industry and investors to achieve net zero emissions from the concrete and cement industry over the next 25 years.
Concrete is the most widely used material in the world after water, and concrete and cement are vital components of global economic development, construction, transportation and other infrastructure. This industry is more responsible for 8% of global CO2 emissions than aviation and transport combined. Cement and concrete production continues to increase to meet global demand, making emissions challenges even more severe. Without efficiency improvements, demand for cement is expected to increase by 50% by 2050.
The goal of "Achieving net-zero emissions from concrete and cement" reflects how, in a net-zero industry scenario, the industry can achieve net-zero greenhouse gas emissions and comply with the 1.5°C warming target by taking urgent action on three pillars:
A 22% reduction in emissions can be achieved from the demand side by improving efficiency during construction and reducing the amount of concrete required for the design without sacrificing safety or durability.
A 25% reduction in process emissions can be achieved from the supply side by reducing the slag used through supplemental cementitious materials (SCM) while bringing alternative chemical materials to the commercial market.
53% of emissions can be reduced, eliminated, or captured through integrated fuel switching, power sector decarbonization, and carbon capture utilization and storage (CCUS).
Carbon Capture, Utilization and Storage (CCUS) technology currently has the greatest emission reduction potential of all existing technologies, and 33-45 new 80 million tons must be built by 2030 if the industry is to stay within the carbon budget. CO2 CCUS plant. However, according to the new data on environmental protection industrial project tracking announced by the MPP in COP28, it is difficult for projects to reach final investment decisions (FID) due to the lack of existing projects. Fifteen factories have already reached critical mass.
Faustine Delasalle said: "The report clarifies that achieving net-zero emissions from the concrete and cement industry is possible, but time is running out. Now is the time for the entire value chain and governments to leap of faith and work together."
A cement foaming machine and cement foaming agent produce foam concrete. Let's look at what cement foaming machines and cement foaming agents are.
The cement foaming machine and the cement foaming agent are interdependent. The cement foaming agent itself cannot automatically become a foam. It need to pass through the mechanical action of the foaming machine to become a foam. The cement foaming machines and cement foaming agents are a technical system that cooperates. They cannot function alone, and neither can do without the other. Between the two, it cannot be said who is important or not. Their roles are equivalent. Without a foaming agent, the foaming machine cannot produce foam and loses its value of existence. Similarly, no matter how good the foaming agent is without a foaming machine, it cannot become foam, and its purpose will be lost.
TRUNNANO is a supplier of foaming agent and equipment for concrete, which is concrete and relative products 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 foaming agent and equipment, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
South Africa's cement and concrete industry faces multiple challenges and threats, including economic recession, cheap imports, rising input costs, construction sabotage activities and a construction industry crisis caused by a lack of major projects, according to a recent report by the South African Money Bag website.
The large-scale infrastructure spending planned by the South African government to kick-start economic recovery after the COVID-19 pandemic has largely failed to materialize, putting approximately 35,000 local jobs and billions of investments in the cement industry value chain at risk.
Industry insiders said South Africa's local cement production capacity is about 20 million tons. Still, the industry's current output is only 12 million tons, while South Africa's annual cement imports exceed 1 million tons, equivalent to the output of the entire cement plant.
Affected by the global pandemic and the slowdown in infrastructure construction in South Africa, more measures must be taken to ensure the industry's sustainability.
Hydroxypropyl methylcellulose is a multifunctional compound with the following properties:
1. Solubility: Hydroxypropyl methylcellulose has good solubility in water and forms a transparent solution.
2. Stability: It has high heat, light, and chemical stability and has a long shelf life.
3. Interface activity: Hydroxypropyl methylcellulose has a certain surface tension reduction effect and can thicken, emulsify and stabilize emulsions.
Increase the strength of concrete
HPMC can form a certain network structure in concrete to increase its strength and durability. It can fill micropores and cracks in concrete and prevent concrete from cracking and damage. At the same time, HPMC can also promote the hydration reaction of cement particles in concrete and increase the strength and hardness of concrete.
Improve the durability of concrete
HPMC can prevent concrete cracking and damage and improve concrete's durability. It can fill micropores and cracks in concrete, prevent the penetration of moisture and oxygen, and reduce the corrosion and aging of concrete. At the same time, HPMC can also reduce shrinkage and deformation in concrete and maintain the stability and durability of concrete.
Improve the fluidity of concrete
HPMC can increase the viscosity of concrete and improve its fluidity. It can make concrete easier to construct and shape, reducing delamination and bubbles. At the same time, HPMC can also reduce water loss in concrete and maintain the humidity and fluidity of concrete.
Improve the crack resistance of concrete
HPMC can fill micropores and cracks in concrete and improve the crack resistance of concrete. It prevents concrete cracking and damage, reducing concrete repairs and replacements. At the same time, HPMC can also reduce shrinkage and deformation in concrete and maintain concrete's stability and crack resistance.
TRUNNANO is a supplier of HPMC Powder, which is concrete and relative products 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 HPMC Hydroxypropyl Methyl Cellulose, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
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