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Setting of cement involves
a)Absorption of heat b)Evolution of of heat
c)Expansion d)Contraction
Can anyone help me out with proper reasoning
Dear Palaash
the correct options are (b) and (d)
When mixed with water, cement sets to a hard mass. It first forms a plastic mass which hardens after some time due to 3-dimensional cross-links between the --Si-O-Si-- and --Si-O-Al-- chains. The first setting occurs within 24 hours whereas the subsequent hardening requires a fortnight, when it is covered by a layer of water. This transition from plastic to solid state is called setting.
This calcium hydroxide binds calcium silicate particles together. On the other hand, aluminium hydroxide fills the interstices (an intervening space) rendering the mass impervious (not affording passage to a fluid).
ALL THE best AskIITIANsExpert ABhinav Batra
ALL THE best
AskIITIANsExpert
ABhinav Batra
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