参数法设计自密实混凝土配合比

Parameter method for mix design of self-compacting concrete

提出一套计算自密实混凝土配合比的参数设计法。在此方法中,参数α为粗骨料系数,β为砂拨开系数,γ为掺合料系数,它们主要提供拌合物的工作性能。水胶比W/B主要与混凝土硬化后的强度和耐久性有关。针对所用原材料,建议α取值0.63～0.65,β取值1.50～1.60,γ取值根据实际情况和净浆流动度试验结果选定,W/B要考虑强度和耐久性要求。

This study proposes a new mix design method for self-compacting concrete（SCC） named parameter method.In this method, the parameter α, β and γ represents the modulus of coarse, fine aggregates and mineral admixture respectively,which provide the workability of SCC at fresh state,while the parameter W/B is mostly related with the strength and durability of SCC after hardened. For the raw materials used in this study,two values of 0.63～0.65 and 1.50～1.60 were recommended for α and β ,while the value of γ should be selected according to the existing condition and based on the result of flow test on paste.As far as deciding the value ofW/B ,we should take strength and durability of SCC into consideration.