In addition to selecting a high-quality portland cement, producers optimize aggregates, then optimize the combination of materials by varying the proportions of cement, water, aggregates, and admixtures.

• 除了选用高性能的波特兰水泥以外，还要选用合适的骨料，然后通过调整水泥、、料和外加剂的比例使各种材料的组合达到最佳。