As one of the most important concrete admixtures, concrete plasticizer can significantly improve the fluidity, water resistance, crack resistance and strength of concrete, making it more durable and stable. This helps us improve project quality and construction efficiency. In the future development, with the continuous improvement of building material performance requirements, the application prospects of concrete plasticizer will be more extensive.
Main Categories of Concrete Plasticizer
oncrete plasticizer is an additive that can improve the performance of concrete and increase its plasticity. It usually contains dispersants, retarders, expanders and plasticizers. According to its chemical composition and mechanism of action, concrete plasticizers can be divided into the following categories:
- Organic plasticizer. Made of organic compounds containing ether, ester, epoxy, etc., it usually has good dispersing and lubricating effects, and is suitable for building concrete, prefabricated components, repair projects, etc.
- Inorganic plasticizer. Generally made of inorganic materials such as silicate, calcium carbide, and ammonium salt, it has good filling and wetting effects, and is suitable for excavation and landfill, road paving and other projects.
- Composite plasticizer. It is a mixture of different types of organic plasticizers and inorganic plasticizers, with comprehensive improvement performance, which can take into account the fluidity, strength and crack resistance of concrete, and is suitable for large-scale projects such as bridges and high-rise buildings.
(1) Plasticizer
Concrete plasticizer is not an independent classification, but a part of concrete admixtures. Its specific type may vary depending on the composition and performance.
The mechanism of action of plasticizer is relatively complex, mainly including increasing the solubility of cement, improving particle dispersion, increasing lubrication, etc., thereby improving the plasticity and fluidity of concrete.
Plasticizer is mainly used to improve the plasticity and fluidity of concrete, making it more suitable for complex construction environments and structural requirements.
(2) Water reducer
Concrete water reducer is an admixture that can significantly reduce the amount of mixing water while maintaining the slump of concrete basically unchanged.
The mechanism of action of water reducer mainly includes dispersion, lubrication and steric hindrance. The hydrophilic group and hydrophobic group in its molecular structure are adsorbed on the surface of cement particles and aqueous solution respectively, and the cement particles are dispersed through electrostatic repulsion and steric hindrance effect, releasing more free water, thereby improving the fluidity of concrete.
Water reducing admixture has a wider range of applications and can be used in almost all occasions where the workability, strength and durability of concrete need to be improved. Especially in high-strength, high-performance concrete and large-volume concrete, the role of water reducer is more significant.
- Construction field. Used in the construction of buildings, bridges, underground pipelines and other construction facilities to improve the quality of concrete, save materials and time, and reduce costs.
- Transportation field. In the construction of transportation facilities such as bridges and roads, it improves the durability and crack resistance of concrete and prevents defects such as cracks and potholes on the concrete surface.
- Water conservancy field. In the construction of water conservancy facilities, it improves the permeability and water resistance of concrete, prevents weathering and erosion of cement components, and extends the service life of water conservancy facilities.
Concrete plasticizer can change the physical and chemical properties of concrete by chemically reacting or physically adsorbing with raw materials such as cement, sand, and stone in concrete, thereby improving its performance. Specifically, the working principles of concrete plasticizers include:
- Improving the fluidity of concrete. The plasticizer can change the surface tension and viscosity of concrete, making it more fluid and plastic, which is convenient for pouring and compacting during construction.
- Improving the crack resistance of concrete. It can reduce the shrinkage rate and temperature stress of concrete, reduce the pressure inside the concrete, and thus reduce the possibility of concrete cracking.
- Increasing the strength of concrete. They can promote the hydration reaction inside the concrete, effectively utilize the hydration heat in the cement, accelerate the hardening process, and enhance the strength and hardness of the concrete.
- Improving the water resistance of concrete. Concrete plasticizers can improve the waterproof performance of concrete, reduce water penetration and leakage, and improve the water resistance and corrosion resistance of concrete.
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