Repeat rate of hydration of cement quick setting and early stiffening are the effects of
Answers
Explanation:
FACTORS AFFECTING THE SETTING AND HARDENING OF PORTLAND CEMENT
(1) THE IMPACT OF CEMENT’S COMPOSITION
The mineral composition of cement and their ratios are the main factors affecting the setting and hardening of cement. As mentioned above, various mineral components will reveal different characteristics when reacting with water. For example, the increase of C3A can speed up the setting and hardening rate of cement, and the heat of hydration is high at the same time.
Generally speaking, if mixed materials are added into the cement clinker, the anti-erosion will increase, and the heat of hydration and the early strength will decrease.
Answer:
Because in this case , gypsum is acting as an inhibitant to the setting of cement. When gypsum is added to cement,it binds with tricalcium aluminates to make a colloidal gel which slows down the fixing/setting of cement for sometime.
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