摘要
排水沥青混合料主要依靠内部连通空隙排出路表积水,但目前设计排水沥青路面时更多的是参照空隙率指标,而不是连通空隙率指标。为更准确地认识连通空隙率的影响因素,以及其与排水、抗滑、降噪之间的关系,通过室内试验成型不同筛孔通过率的排水沥青混合料PAC-10试件,测得每个试件的渗水系数,并分别使用体积法以及真空塑封法测得其空隙率与连通空隙率。优选5个连通空隙率从小到大差值为2%左右的级配成型试件测得其摆值及吸声系数。结果表明:两种方法得到的连通空隙率都比空隙率与渗水系数线性回归相关系数高,其中体积法测得的连通空隙率与渗水系数相关系数最大R^(2)=0.991,说明它能解释渗水系数99.1%的变异量,更能准确地反映排水沥青混合料的排水能力;使用体积法测得的空隙率与连通空隙率之间在空隙率大于20%时呈线型关系,且线性关系良好,但当空隙率小于20%时,数据开始偏离拟合直线,相关性变差;连通空隙率与2.36 mm筛孔的通过率及4.75 mm通过率之间呈线性关系,2.36 mm及4.75 mm筛孔通过率越小,连通空隙率越大;同时降低4.75 mm与2.36 mm通过率可有效提高连通空隙率;抗滑及降噪效果随着连通空隙的增大而增大,当连通空隙率超过18%之后抗滑降噪增长速度下降明显。
The porous asphalt mixture mainly relies on the internal connected void ratio to drain water out of the surface, but at present, the design of the porous asphalt pavement is more referring to the void ratio rather than the connected void ratio. For more accurate understanding the influencing factors of connected void ratio and its relationship with drainage, sliding resistance and denoisng, the drained asphalt mixture PAC-10 specimens with different mesh passing rates are prepared through indoor test, the water permeability coefficient of each specimen is measured, and the void ratio and connected void ratio are measured by using volumetric method and vacuum encapsulation method. The pendulum values and sound absorption coefficients of 5 graded formed specimens with connected void ratio difference of about 2% from small to large are selected and measured. The result shows that(1) The connected void ratios obtained by the 2 methods are higher than the linear regression correlation coefficient between the void ratio and the water seepage coefficient, and the maximum correlation coefficient between the connected void ratio and the water seepage coefficient measured by the volume method is R^(2)=0.991, indicating that it can explain 99.1% of the variation of the water seepage coefficient, and can more accurately reflect the drainage capacity of the porous asphalt mixture.(2) When the void ratio is greater than 20%, there is a good linear relationship between the void ratio and the connected void ratio measured by the volume method. However, when the void ratio is less than 20%, the data start to deviate from the fitting line and the correlation becomes worse.(3) There are linear relationships of the connected void ratio with the passing rates of 2.36 mm sieve and 4.75 mm sieve. The smaller the passing rate of 2.36 mm sieve and 4.75 mm sieve, the larger the connected void ratio.(4) The connectivity void ratio can be effectively improved by reducing the pass ratios of 4.75 mm and 2.36 mm.(5) The effects of anti-slip an
作者
黄丰
刘沛荣
王灿升
邹杰
农智雄
HUANG Feng;LIU Pei-rong;WANG Can-sheng;ZOU Jie;NONG Zhi-xiong(Guangxi Liujing-Binyang Expressway Construction and Development Co.,Ltd.,Nanning Guangxi 530400,China;Zhonglu Jiaojian(Beijing)Material Engineering Technology Co.,Ltd.,Beijing 100176,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2023年第1期41-47,共7页
Journal of Highway and Transportation Research and Development
基金
广州交投集团科技项目(BLX-SGYY-2021-001)
江西省交通厅科技项目(2022H0006)。
关键词
道路工程
排水沥青路面
关键粒径
空隙率
连通空隙率
road engineering
porous asphalt pavement
key sieve
air voids
connected air voids
