What is alkali active aggregate?
The active aggregate is the active mineral fine admixture can promote the cement hydration product further transformation, improve the hardened concrete pore structure, improve the concrete compact performance
Aggregate in the active SiO2 is too high, such as chalcedony, agate, scales quartz, square quartz and so on.
What is the base active aggregate? "Ordinary concrete with gravel or pebble quality standards and test methods JCJ53-92" provides: alkali active aggregate - with cement or concrete in the alkali chemical reaction Aggregate.
In the construction process sometimes encounter the following questions: What is the alkali active aggregate? How does it determine that the aggregate is an alkali-active aggregate? Before answering this question, let's say what is the alkali-aggregate reaction. The alkali-aggregate reaction refers to the soluble alkali (K) in the cement, admixture, admixture or mixed water *, Na *) is dissolved in the concrete void fluid and reacts with the active ingredient (such as SiO2) with the alkali in the aggregate after the coagulation and hardening of the concrete, resulting in alkali-containing gel, water swelling, Internal stress and cracking. It can make a serious decline in the durability of concrete. It is difficult to prevent its development, it is difficult to repair.
