Which of the following cements is suitable for use in massive concrete structures such as large dams ?

low heat cement, but you can use normal cement with fly ash

The answer is :

b) low heat cement

In massive concrete structures, heat of hydration plays important part. High heat of hydration will create cracks in the structure, hence we can use either;

1- Low heat cement

2- Cement blended with flyash/slag

3- Cement with low C3A content preferably mixed with flyash/slag

for mass concrete, you should control heat of hydration

SRC= sulphate resisting cement

Ordinary Portland cement with curing compound.

Low Heat Cement

SR Cement

to a good resulte for cement it depened to

a qualt of  cement and good mix on time than good waterig

1. Use low heat cement

2. Ordinary cement with flyash

If using the portland cement then need to control the concrete temprature because heat of hydration increase the temprature. which cause or develop the cracks.

I worked in dam project and 22 degree centigrade temprature of concrete cause the cracks although we used fly ash.

We controlled by keeping the concrete temp under 10 degree centigrade at the time of placement. We used liquid nitrogen to keep the concrete temprature under 10 degree centigrade but very expensive.

other type of cement or blended cement may use to control the concrete temprature in order to avoid the cracks