水泥路面改性环氧磨耗层骨料形状特征分析与评价

Aggregate Shape Analysis and Evaluation of Modified Epoxy Wear Layer for Cement Pavement

目的分析水泥路面改性环氧树脂磨耗层骨料形状特征,建立评价指标体系,推荐抗剥落性最好的骨料类型.方法利用骨料图像测量系统和数字图像处理技术,对4种骨料的轮廓形状、棱角性和表面纹理等形状特征进行量化研究,建立二级评价体系,利用层次分析法计算各级指标权重,进而对4种骨料的抗剥落性进行评估.结果玄武岩、花岗岩、石灰岩和辉绿岩4种骨料的针状性相似;玄武岩和辉绿岩的圆度和球度更接近于1,对应的抗滑耐磨性能优于花岗岩和石灰岩;石灰岩的棱角度数值最高,其次是花岗岩,最后是玄武岩和辉绿岩;表面纹理指数越高,细观纹理性能越优异,凹凸的粗糙表面也就越多;计算4种骨料的骨料形状特征综合评价指标Asc值,指出玄武岩是最理想的磨耗层骨料类型,辉绿岩次之;并利用玄武岩骨料铺筑一油一石和两油两石的实体工程,半年后检测两种施工工艺的抗拉强度和剪切强度均大于1.50 MPa,满足粘结强度的要求.结论利用层次分析法计算指标权重,结合骨料形状特征综合评价指标的计算,选择水泥路面改性环氧磨耗层骨料,为工程中预防性养护的进一步发展打下理论基础.

The aggregate shape characteristics of modified epoxy wear layer for cement concrete were analyzed,the evaluation index system was established,and then the best aggregate was recommended. The shape characteristics and surface textureof four kinds of aggregate were quantita-tively studied by using aggregate image measurement system and digital image processing technology. Based on the analysis of the skid resistance and the anti-peeling property of the aggregate,the secondary evaluation system of modified epoxy wear layer of cement pavement was proposed,and the weight of the index is calculated by the analytic hierarchy process. The anti-peeling properties of four aggregates were evaluated. The results showthat the acicularity of basalts,granites,limestone and diabase are similar. The roundness and sphericity of basalt and diabase are closer to 1,and the corresponding skid resistance is better than granite and limestone. The angle value of limestone is the highest value,followed by granite,and finally basalt and diabase. The higher the surface texture index,the better the fine texture performance,the more therough surface. The aggregate shape characteristics Ascvalues of the four aggregates indicate that the basalt is the ideal type of wear layer,followed by diabase. The engineering of one oil and one stone,two oil and two stone was paved by using the basalt aggregate,after six months,both the tensile strength and shear strength are greater than 1. 50 MPa,it meets the bonding strength requirements. The weight of the index was calculated by using the analytic hierarchy process,thentheevaluationindexof aggregate shape characteristicswascalculated. The best aggregate is selected by the index for the modified epoxy wear layer for cement pavement,which can lay the theoretical basis for the prevention.