Anyone in the construction industry knows of a product called concrete admixture, which is added before or during the mixing process to improve the new energy of mixed concrete and hardened concrete. The admixture is not much more than five percent of the quality of the cement (except in special cases).
1. Concrete admixtures are divided into four categories according to their functions
(1) admixtures to improve the performance of concrete mixing and logistics, including various water-reducing agents, pumping agents and air entraining agents;
(2) admixtures for regulating the setting time and hardening performance of concrete, including retarder, early-strength agent and accelerating agent;
(3) admixtures to improve the durability of concrete, including air-entraining agent, water-proofing agent, rust inhibitor, etc.;
(4) admixtures to improve other properties of concrete, including expansion agent, antifreeze, colorant, etc.
2. Concrete admixture standard defined in 27 kinds of admixtures, common water reducing agent, retarder, early strength agent, coagulant, air-entraining agent, high efficiency water reducing agent, retarding high efficiency water reducing agent and early strength jianshuiji, retarding water reducing agent, air-entraining water reducing agent, waterproofing agent, rust agent, air entrained agent, expansive agent, antifreeze, colorant, accelerator, pumping agent, water retention agent, flocculant, thickening agent, shrinkage-reducing agent, agent, grinding fine fine slag, silica fume, fly ash, fine grinding of natural zeolite.
Ordinary water-reducing agent refers to the admixture that can reduce water consumption when the concrete collapse degree is basically the same;Early strength agent is the admixture to accelerate the early strength development of concrete.Retarder is the admixture that prolongs the setting time of concrete;Coagulant is an admixture that can shorten the setting time of mixing.
The air-entraining agent refers to the admixture that can introduce a large number of evenly distributed, stable and closed micro bubbles in the concrete mixing process and can be retained in the hardened concrete. The efficient water-reducing agent refers to the admixture that can greatly reduce the water consumption for mixing under the condition that the concrete collapse degree is basically the same.
Retarding and efficient water reducer refers to the admixture with retarding and efficient water reducing functions.Early strength water reducing agent refers to both early strength and water reducing admixture.Retarder is the admixture with retarder and water reducing function, while the air-reducing agent is the admixture with both retarder and water reducing function.Waterproofing agent refers to the admixture that can improve the impermeability of cement mortar and concrete, and rust inhibitor refers to the admixture that can inhibit or reduce the corrosion of steel reinforcement and other metal embedded parts in concrete.
