水泥路面混凝土配合比设计与耐久性研究

Study on Concrete Mix Proportion Design and Durability of Cement Concrete Pavement

针对水泥混凝土路面耐久性问题,首先给出了脆性系数、断裂韧性与弯拉弹性模量三个评价指标,然后设计并进行了四因素(水灰比、砂率、水泥用量、水泥细度)五水平二次回归正交试验。通过实验数据分析得出结论:水泥混凝土在抵抗裂纹扩展方面最优设计配合比为水灰比:0.41;砂率:37.5%;水泥用量:406 kg/m^3;水泥细度:375 m^2/kg;水泥混凝土在刚度方面最优配合比考虑为水灰比:0.41;砂率:32%;水泥细度:300 m^2/kg;综合四因素考虑最终给出了路面水泥混凝土耐久性配合比建议范围:水灰比:0.38~0.41;砂率:35.2%~37.5%;水泥用量:390~406 kg/m^3;水泥细度:375~420 m^2/kg。

Aiming at the problem of cement concrete pavement durability, firstly, bntUeness co- efficient, fracture toughness and flexural modulus of three evaluation indexes, and then the design of four factors （water and cement ratio, sand ratio, dosage of cement, cement fineness） two orthogonal experi- ments with five levels. Through data analysis concluded： cement concrete crack propagation resistance in the optimal mix design for water cement ratio： 0.41 ; Sand rate： 37.5% ; the amount of cement sand ra- tio： 406 kg/m3 ; Cement fineness： 375 m2/kg; cement fineness： Cement Concrete stiffness is considered as optimal ratio of water cement ratio： 0.41 ; sand rate： 32% ; cement fineness： 300 m2/kg; comprehen- sive consideration is given to the four recommendations with cement concrete pavement durability： water cement ratio： 0.38 -0.41 ; 35.2% -37.5% ; the dosage of cement sand ratio, fineness of cement： 375 m2/kg-420 m2/kg： 390 kg/m3 -406 kg/m3.