| Calcium and sodium stearate soap additions in the ordinary
portland cement have been studied by mixing 0.5, 1.0, 1.5,
2.0, 2.5 and 3.0 per cent respectively by weight of cement.
Cement and sand mortar in the ratio of 1 :3 with different
percentages of additives were tested for workability and
water retention properties. It was observed that calcium
soap was more effective in increasing the workability and
_sodium soap in water retention property. Setting time on
the neat cement with additives indicated that both the soaps
acted as accelerator and both the initial and as well as the
final setting time were reduced in each case. The tensile
strength of cement was not affected much in the case of calcium
soap addition while a little lowering in strength was
observed in the case of sodium soap. |
