陶瓷细骨料替代方式对混凝土抗压强度的影响

为了提高废弃陶瓷在混凝土中的利用率，将废弃陶瓷破碎、筛分加工成人工细骨料，按不同比例(10%，20%，30%，40%及50%)，且分别采用“C”替代法(即传统替代方式，要求陶瓷细骨料细度模数与天然河砂细度模数相近即可，等质量取代)、“P”替代法(陶瓷细骨料一对一平均替代对应的不同粒径的天然河砂)、“D”替代法(陶瓷细骨料一对一且仅替代粒径为1.18，2.36和4.75mm粒径相对较大的天然河砂)及“X”替代法(陶瓷细骨料一对一且仅替代粒径为0.15，0.3和0.6mm粒径相对较小的天然河砂)取代天然河砂，制备陶瓷细骨料混凝土.共设计21组混凝土，包括基准混凝土1组，“C”，“P”，“D”及“X”替代法各5组.水胶比均为0.49，进行混凝土28d的抗压强度试验.结果表明:在水胶比为0.49的条件下，陶瓷细骨料掺量不大于50%时，陶瓷细骨料混凝土抗压强度和基准混凝土为同一强度等级，均到达C30强度等级要求；不同的替代方式，对应的陶瓷细骨料最佳掺量不同；不同的陶瓷细骨料掺量，对应的最优替代方式不同.

Effect of Substitution of Ceramic Fine Aggregate on Compressive Strength of Concrete

In order to improve the utilization rate of waste ceramics in concrete， ceramic concrete was prepared by using “C” substitution method (traditional equal mass substitution method)，“P” substitution method (substitute natural river sands with different particle sizes)， “D” substitution method (substitute natural river sands with particle sizes of 1.18， 2.36 and 4.75mm) and “X” substitution method (substitute natural river sands with particle sizes of 0.15， 0.3 and 0.6mm.) to replace natural fine aggregate according to different proportion (10%， 20%， 30%， 40%， 50%). 21 groups of concrete were designed， including 1 group of reference concrete， 5 groups of concrete prepared of “C”， “P”， “D” and “X” substitution method respectively. The water-binder ratio is 0.49， and the compressive strength test of concrete takes for 28 days. The results show that when the water-binder ratio is 0.49 and the ceramic fine aggregate content is less than 50%， the compressive strength of ceramic fine aggregate concrete and the reference concrete are of the same strength level， and all reach the strength level of C30. The optimal substitution rate is different for different ceramic fine aggregate substitution methods. Different substitution rates of ceramic fine aggregate correspond to different optimal substitution methods.