But the mix design of SCC now only considers the max particle diameter of coarse aggregate and fineness modulus of sand. However, the surface area and void fraction of aggregate influes the volume of paste.
骨料对自密实混凝土的工作性能影响很大，但现有的自密实混凝土配合比只考虑粗骨料的最大粒径和砂子的细度模数，而骨料的总表面积、空隙率直接影响水泥浆的用量。
The increase of fineness of fly ash does not improve hydration degree of pastes, the dense packing and micro aggregate effect of ultrafine fly ash play an important role in improvement of compressive strength of hardened pastes.
粉煤灰细度的增加并没有提高水泥粉煤灰复合胶凝材料的水化程度，而超细粉煤灰的密实填充和微集料效应对硬化浆体后期抗压强度的增加起到了重要的作用。
The effect of a variety of water reducing agent, portland cement and its composition and fineness, cement content, water-cement ratio, and aggregate quality and granularity on the concrete properties are investigated.
试验查明减水剂品种、水泥品种、矿物组成和细度、水泥用量、水灰比、骨料质地和粒状的影响。