【摘要】 将煤矸石最大限度地应用于高等级路面基层是一项重要的利用途径。首先研究了煤矸石的物化特性,其次采用部分煤矸石替代2. 36～13. 2 mm范围内的普通碎石,选用5. 5%的水泥剂量,依据煤矸石、碎石的不同掺量设定了8组级配混合料,进行室内7 d无侧限抗压强度试验;最后对3组优选级配混合料进行力学性能试验研究。结果表明:煤矸石性能良好,采用26%～30%的碎石1号料,煤矸石利用量可达到35%～47%,且混合料的7 d无侧限抗压强度满足规范中高等级路面基层的要求;经过标准养生28 d和90 d的混合料抗压强度、抗压回弹模量、劈裂强度和劈裂回弹模量均能满足规范要求,该混合料可用于高等级路面基层。更多还原

【Abstract】 It is an important way to apply coal gangue to the base of high-grade pavement to the maximum extent. The physical and chemical properties of gangue were studied at first. Secondly,some gangues were used to replace ordinary gravels in the range of 2. 36-13. 2 mm. According to the different dosages of gangues and gravels,when the cement dosage was 5. 5%,8 groups of graded mixtures were set for the 7 d unconfined compressive strength test. Finally,3 groups of preferred graded mixtures were selected for mechanical performance test. The results show that the gangue has better characteristics,with 26%-30% 1 # gravel,the utilization of gangue can reach 35%-47%,and the 7 d unconfined compressive strength of the mixture meets the requirements of the specification for high-grade pavement bases,the compressive strength,compressive rebound modulus,splitting strength and splitting rebound modulus of the mixture after standard curing of 28 d and 90 d can meet the requirements of the specification,and the mixture can be applied to a highgrade pavement base.更多还原