I am trying to mix cement:lime:sand mortar in the lab for research
purpose. However, I am not sure about the amount of water required to
achieve good strength and sufficient workability for cement:lime:sand
mortar. For cement:sand mortar, the water/cement ratio is normally
being 0.45-0.65 or so. Will the water/cement ratio change when we add
lime? should we proportion water for the combined cement+lime content.
I am mixing a 1:2:9 cement:lime:sand mortar and have worked out the
following material weights in accordance with ASTM C270-06.
Portland cement: 131 grams (density = 94 lbs/ft3)
Hydrated lime: 111 grams (density = 40 lbs/ft3)
Sand: 1000 grams (density = 80 lbs/ft3)
Can you please comment on the mix design. Obviously, it is quite a
weak mortar mix - ASTM type 'O'.
If we work out the amount of water with a 0.485 (ASTM standard) w/c
ratio, the amount of water comes out to:
water = 0.485 (131) = 64 grams
or with a water/lime + cement ratio of 0.485:
water = 117 grams
I thank you in anticipation of your promt response.
With best regards,