By breaking the trial into two ranges is in the first stage is to test the basic ratios include the ratio of cement water ratio per sandy, cement and corn sizes.
The trial divided into two periods: during the first trial, including preliminary ratio of cement, sand, water to cement ratio. And the size of the corn
The study was divided into 2 periods. In the first test the initial ratio including cement to sand ratio, the. Water cement ratio and the size of the corn.