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Outdoor Problems of the Householder: Cement

Cement is, therefore, only one part CEMENT SAND 12 STONE 12 CONCRETE Required quantities of cement, sand, and stone or gravel for a 1:2:4 concrete mixture and the resulting quantity of of Public Roads.) of a concrete mixture. The great bulk of concrete is gravel and sand.

The object to be obtained in mixing is to fill all the spaces or voids between the stone or gravel with sand, and the spaces between the particles OUTDOOR PROBLEMS OF THE HOUSEHOLDER 281 of sand with cement. And such is an ideal mixture. In other words, only sufficient cement is required, in theory, to cover the surface of the particles of sand, gravel and stone with a thin coating of wet cement sufficient to stick or glue them firmly together.

To secure such an ideal mixture it is necessary to observe the proper proportions of the different ingredients. These proportions have been determined by experience and if the following rules are followed, good results will be assured.