Which of the statements regarding to Portland Cement are correct?
1.Silica imparts strength to cement
2.Alumina makes cement quick setting
3.Excess of lime increases strength of cement
4.Calcium sulphate decreases initial setting time of cement
Select the correct answer using the code below
- 2 and 4 only
- 1 and 3
- 1,2 and 4
- 1 and 2 only