公路工程

为降低花岗岩废石粉(GWP)对环境的不利影响，对GWP再利用，研究了不同GWP掺量下对水泥稳定碎石基本力学性能、收缩性能和水稳定性影响，并结合SEM试验探究GWP对水泥石的微观相貌影响。结果表明：随着GWP掺量增加，水泥稳定碎石的无侧限抗压强度和水稳定性先增大后减小；当掺量为2%时，其强度和水稳定性均达到最大值，7、28 d强度分别为7.1、8.3 MPa,比掺量为0%时的水泥稳定碎石分别高11%、5.1%;7、28 d水稳定系数分别为0.8、0.935。水泥稳定碎石试件的干燥收缩和温度收缩随着GWP掺量增加而增加，当GWP掺量大于3%,干缩系数趋于稳定；当温度在0～10℃时，温缩系数最低。GWP可改善水泥石的C-S-H凝胶数量和孔隙结构，从而提高强度。

In order to reduce the negative impact of Granite Waste Powder(GWP) on the environment and promote the reuse of GWP,the effects of different GWP dosage on the basic mechanical properties, drying shrinkage properties and water stability of cement stabilized aggregates were investigated, and the effects of GWP on the microscopic phase of cement paste were also explored in conjunction with SEM tests. The results show that: the unconfined compressive strength and water stability of cement stabilized aggregates increase and then decrease with the increase of GWP dosage; when the dosage is 2%, its strength and water stability reach the maximum value, and the 7d and 28d strengths are 7.1、8.3 MPa respectively, which are 11% and 5.1% higher than those of the cement stabilized aggregates with 0% dosage; the water stability coefficients of 7d and 28d are 0.8 and 0.935 respectively. The drying shrinkage and temperature shrinkage of cement stabilized aggregates specimens increased with the increase of GWP dosage, and the drying shrinkage coefficient tends to be stabilized when the dosage of GWP is more than 3%; the temperature shrinkage coefficient is the lowest when the temperature is under 0～10℃. GWP can improve the number of C-S-H gel and the pore structure of the cement paste, so as to improve the strength.