In a general manner, explain how the rate of heat generation progresses during the formation of the concrete crystal matrix formed from cement paste molecules.  Be thorough in answering this question

Q1) Read the following sentences, write true or false, and correct the sentences that are false: 70, and by 20% 111 I Ultian vanas Ol Yu 3- The alkali silica reaction is very fast, happen between active silica in the cement and the alkalis in aggregate. Call wings: [5M] 4- Sulphate in mixing water should not be more than 10,000 ppm. 5- Higher curing temperature decrease earlier strength, but it increases 28-day strength of concrete.

Explain how 27Al NMR is useful for studying cement hydration.

Hydration of cement is exothermic process that generates heat. The table below shows the heat generate with different cement components. Which component is recommended to build a dam wall which is a large amount of cement block? a. None of the above b. C2S only which generate less heat and less thermal stress c. A mixture of Low heat cements to avoid thermal stress and high energy released and other factors should be considered. d. C3A because it generates large amount of heat and dry the block faster.