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nature : the cement is a condensation process of hardening concrete (including mortar and cement paste) have controlled inflation, reduce shrinkage admixtures. In cement hydration and hardening stage, expanders can expand itself, but also concrete and other ingredients reaction expansion. Restrictions and can be used to restrict non-pouring of concrete. According expanders can be divided into main components : sulfur and calcium aluminate - expanders lime, iron-expanders, filling agent. Expanders restrictions on expansions into First Commodities (water 14 days restrained expansion of not less than 0.04%) and qualified Commodities (water 14 days restrained expansion of not less than 0.02%). The main compensation for the preparation of concrete shrinkage (or mortar), filled with expansive concrete (or mortar), and since stress concrete (or mortar). I stored the middle period of six months shall be mixed with cement release.
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