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随着高层建筑的发展,对混凝土的质量要求越来越高,尤其是对其压缩强度的要求,通常已超过60MPa。若用传统技术要得到如此高压缩强度的混凝土,只能加大水灰比中的水泥比例。 混凝土用复合粘结材料不仅可提高压缩强度,而且能进一步改善混凝土的可加工性能。所用原料为水泥、粉煤灰和粒化高炉矿渣。其中粉煤灰的颗粒外形多为球形,为保证其形态,粉煤灰不经粉碎工序,筛分其中小于20μm的待用。这样不仅能改善混凝土的可加工性,而且
With the development of high-rise buildings, the quality requirements for concrete are getting higher and higher, especially the requirements for its compressive strength, which usually exceed 60 MPa. If concrete with such high compressive strength is to be obtained by conventional techniques, the proportion of cement in the water-cement ratio can only be increased. The composite bond material for concrete not only improves the compressive strength but also further improves the processability of the concrete. The raw materials used were cement, fly ash and granulated blast furnace slag. Among them, the particle shape of fly ash is mostly spherical. In order to ensure its shape, fly ash is not crushed and sieved, which is less than 20 μm, is to be used. This will not only improve the machinability of the concrete, but also