Concrete additives can be divided into four categories according to their functions:
1, Improve concrete mixing logistics variable performance of admixtures, such as various functions of water reducer.
2, Adjust the concrete setting time, hardening performance of the external price, such as a variety of retarder, early strength agent, accelerating agent, etc.
3, Improve the durability of concrete admixtures, including air-entraining agent, waterproof agent, rust inhibitor, and so on.
4, Improve the performance of concrete other admixtures, including antifreeze agent, expansion agent, foaming agent, release agent, etc.
The types and functions of concrete additives
1. water reducing agent
Water reducing agent is to keep the work ability of concrete unchanged, and significantly reduce its mixing water admixture. Because of the addition of a water reducer in the mixing room, if the unit water consumption is not changed, the work ability can be significantly improved, so the water reducer is also known as a elasticize.
Mechanism of action of water reducing agent Cement and water mixing, cement particles will attract each other, forming a lot of flocculent in the water. In the flocculent structure, a lot of mixing water is wrapped, so that the water can not play the role of increasing the fluidity of slurry. When adding a water reducer, the water reducer can break up the flocculent structure, free water wrapped, thus improving the fluidity of the mixture. At this time, if you still need to keep the work ability of the original concrete unchanged, can significantly reduce the mixing of water, play a role in reducing water, so-called water reducer.
If the strength is maintained unchanged, the amount of cement can be reduced while reducing water, to achieve the purpose of saving cement.
2. early strength agent
The admixtures that accelerate the early strength development of concrete become early strength agents. This kind of concrete can accelerate the process of cement hydration, improve the early strength of concrete, and has no significant effect on the late strength. Commonly used are chloride salt, sulfate, methamphetamine three categories, and based on them complex early strength agents.
3. chemical blowing agent
The process of mixing concrete can introduce a large number of evenly distributed, stable, and closed micro bubble admixtures known as chemical blowing agent. The chemical blowing agent can be introduced in the concrete mixture diameter of about 0.05 ~ 1.25mm bubble, can improve the likability of concrete to improve the frost resistance of concrete, suitable for port engineering, hydraulic engineering, underground waterproof concrete, and other projects, commonly used products are rosin thermal polymer, pine soap, etc., in addition to alkyd sodium sultanate and alkyd benzene sodium sultanate, etc.
The admixture that prolongs the setting time of concrete is called a retarder. In the concrete construction, to prevent in the high temperature, transport distance is longer, the concrete mixture premature condensation affects the pouring quality, to extend the heat release time of mass concrete or layered concrete pouring to prevent construction cracks of the project, often need to add the retarder in the concrete.
Admixtures that can harden concrete at negative temperatures and achieve sufficient antifreeze strength within a specified time are called antifreeze agents. Concrete works under negative temperature conditions must be mixed with antifreeze. In general, antifreeze can not only reduce the freezing point but also promote coagulation, early strength, water reduction, and other functions, so it is mostly composite antifreeze.
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