Fred T. Hodgson · Frederick J. Drake and Co. · leaf 382
Diagram showing the effect of clay on cement mortars.NO. 19. Retempering.—Table III. illustrates the effect of re-tempering Portland cement mortar. The mortars usedconsisted of Portland cement and crushed quartzite be-tween 1 and 2 millimeters in size, mixed in different pro- HOW TO USE THEM 379…