Chemical Admixture Mineral Admixture

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Presentation transcript:

4.2.4.1 Chemical Admixture 4.2.4.2 Mineral Admixture 4.2.4 Concrete Admixture 4.2.4.1 Chemical Admixture Introduction Water-Reducing Admixture Hardening Accelerator Air Entraining Admixture Set Retarding Admixture Flash Setting Admixture Expanding Admixture Frost-resistance Admixture 4.2.4.2 Mineral Admixture

Air Entraining Admixture Definition Mechanism Performance Improving durability Improving workability Decreasing concrete strength Application Common air entraining admixture

Air Entraining Admixture Definition It refers to the concrete admixture that is added bubbles with: large quantities separate independent tiny even Definition

Air Entraining Admixture Mechanism It is the hydrophobic apparent active substance Reduce the surface tension Cause the oriented adsorption in the bubble surface Change the air in the course of mixing into separate, tiny and even bubbles

Air Entraining Admixture Performance Improving durability Improving workability Decreasing concrete strength Air entraining admixture can improve durability and plasticity, but it reduces strength.

How Properties Improved Air entraining admixtures Change the pore structure, improve durability Increase lubricate of aggregates, improve plasticity Increase air content, reduce strength Connected pores Air entraining admixtures Closed pores Fig4.2.2 Sketch map of improve durablity

Air Entraining Admixture Application This type of admixture should always be used in freezing and thawing deterioration. It reduces the strength unnecessarily in structural concrete.

Common Air Entraining Admixture Rosin soap and rosin pyrolytic polymer and so on the amount 0.005%-0.012% introducing D=0.05-1.25mm air bladder making concrete air content to 2%-6% Common Air Entraining Admixture