Builder's sand/15.0 Red iron oxide (optional, up to 5%, based on weight of cement) Type I Portland cement/5.0 Potable tap water/3.5-4.0
配制方法:
The quantity of tap water that is used, within the specified range, is adjusted to yield a mix of plastic consistency with the particular lots of sand and cement that are available, and use of the selected volume of water is then repeated in subsequent tests with the same raw materials.
地址：山东省烟台市开发区南昌大街48号
