Masonry Cement (IS 3466)

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