(Solved): a. The graph below shows examples of TG and DTG data. State what the TG and DTG abbreviations stand ...

a. The graph below shows examples of TG and DTG data. State what the TG and DTG abbreviations stand for and explain the different information TG and DTG data can provide.

The graph in question (a) above shows TG and DTG data for three different concrete samples with the following formulation.

Sample 1: 25 wt% cement paste with 75 wt% aggregate

Sample 2: 78 wt% cement paste with 22 wt% aggregate

Sample 3: 100 wt% cement paste with no aggregate

b. Based on the data, calculate the amount of calcium hydroxide in wt% for each concrete sample when the dehydroxylation of calcium hydroxide can take place according to Reaction 1 shown below at any temperatures in the range of 300- 600oC. The molecular masses of Ca, H, O are 40 g/mol, 1 g/mol and 16 g/mol, respectively.

Ca(OH)2 ?CaO + H2O ----- (1)

Assuming the amount of calcium hydroxide represents the degree of hydration in cement, estimate which sample has the most hydrated cement paste based on the calculation in question (b).