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You are going to cast concrete in a site during a very hot summer.

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Q1) You are going to cast concrete in a site during a very hot summer.

The local market has the two cements available:
Cement A (%): C3S= 50, C2S= 35, C3A= 5, C4AF= 10
Cement B (%): C3S = 65, C2S= 15, C3A= 10, C4AF= 10
Which cement should you select?

Q2) Compute the water/cement ratio needed to obtain zero porosity in a paste that is only 50% hydrated.

Q3) Consider the statement: we should always have a bag of gypsum in the field in case the cement is reacting too fast. Is it correct?

 
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