将硅灰加入混凝土,可显著地降低其透水性和增大其抗压强度,这就使得硅灰混凝土有可能用于需要耐久性和强度的场合。但是,在混凝土中掺入高百分数含量的硅灰时,这种潜在的益处会受到硅灰对新拌的拌合料的不利影响,如降低和易性、可浇筑性、流动性以及易修整性,并使凝聚性和粘着性增大。因此,某些工程标准限制硅灰量为胶结料体积的10％。然而,当混凝土拌合料中的硅酸盐水泥部分地用粉煤灰代替时,新浇拌合料的 Adding silica fume to concrete can significantly reduce its water permeability and increase its compressive strength, which makes it possible for silica fume concrete to be used where durability and strength are required. However, when incorporating high percentages of silica fume in concrete, this potential benefit can be adversely affected by silica fume on fresh mixes, such as reduced workability, castability, flowability, and ease of dressing. Sex, and increase the cohesion and adhesion. Therefore, some engineering standards limit the amount of silica fume to 10% of the binder volume. However, when the Portland cement in the concrete mix is ​​partially replaced with fly ash, the new mix is