Discussion
Which of the following cement compounds is mainly responsible for Initial setting Time of cement ?
Answer: C
Initial setting is mainly due to tri-calcium aluminate (C3A).
C3A reacts with water almost at once and with great heat, and it is this reaction that stiffens the paste first. Left unchecked it causes flash set, which is why gypsum is ground into cement: it slows the C3A reaction enough to leave time for placing.
Tri-calcium silicate (C3S) hydrates next and gives the early strength of the first weeks. Di-calcium silicate (C2S) hydrates slowly and gives later strength. The tetra-calcium compound (C4AF, an aluminoferrite) contributes little to setting or strength.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development