Masonry
Cement (IS 3466)
Masonry
Cement (IS 3466): The Portland cement clinker is ground and mixed
intimately with pozzolanic material (flyash or calcined clay), or
non-pozzolanic (inert) materials (lime-stone, conglomrates, dolomite,
granulated slag) and waste materials (carbonated sludge, mine tailings) and
gypsum and air entraining plasticizer in suitable proportions. The physical
requirements of masonry cement are as follows.
1. Fineness: Residue on 45-micron IS Sieve,
Max, Percent (by wet sieving) 15
2. Setting Time (by Vicat Apparatus):
(a) Initial,
Min 90 min
(b) Final,
Max 24 h
3. Soundness:
(a) Le-Chatelier
expansion, Max 10 mm
(b) Autoclave
expansion, Max 1 %
4.
Compressive Strength: Average strength of not less than 3
mortar cubes of 50 mm size, composed
of 1 part masonry
cement and 3 parts standard sand by
volume, Min
7 days 2.5 MPa
28 days 5 MPa
5. Air Content: Air content of mortar
composed of 1 part masonry cement 6 per
cent
and 3 parts standard sand by volume,
Min
6. Water Retention: Flow after suction of
mortar composed of 1 part 60 % of
masonry cement and 3 parts standard
sand by volume, Min original flow
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