隧道露石混凝土路面试验性能及路用性能研究

Study on Experimental Performance and Road Performance of Tunnel Exposed Concrete Pavement

本文分别选取骨料粒径偏小的EAC1和骨料粒径偏大的EAC2两种配合比制备露石混凝土试件,确定了露石剂的最佳喷洒量.在某隧道中铺筑了SMA-13、EAC1、EAC2、以及刻槽混凝土四种路面,检测比较其宏观纹理、抗滑性能与降噪性能.结果表明:随着温度升高,水泥混凝土表面水膜消失时间不断缩短,露石混凝土的最早、最佳、最迟可刷洗时间均明显提前,且可刷洗窗口期不断缩短.推荐6%露石剂溶液的喷洒量在250~300 g/m 2之间,在相同的露石剂溶液喷洒量下,增大骨料粒径有利于提升露石深度.露石混凝土的抗滑性能与其宏观纹理大小并不一定成正比,过大的骨料粒径不利于路面的抗滑性能.两种露石混凝土的宏观纹理抗衰减性能、抗滑性能与降噪性能均明显优于刻槽路面,而与SMA-13路面接近,且小粒径EAC1路面的各项性能均更好.

Two kinds of mixture ratios,EAC1 with smaller aggregate size and EAC2 with larger aggregate size,were selected to prepare exposed concrete specimens,and the optimum spraying amount of exposed stone agent was determined.Four kinds of pavements,SMA-13,EAC1,EAC2 and grooved concrete,were paved in a tunnel,and their macro-texture,anti-sliding performance and noise reduction performance were tested and compared.The results show that the disappearance time of water film on the surface of cement concrete is shortened with the increase of temperature.The earliest,best and latest washable time of exposed concrete is obviously advanced,and the washable window period is shortened continuously.It is recommended that the spraying amount of 6%exposure agent solution is between 250-300 g/m 2.Under the same spraying amount of exposure agent solution,increasing aggregate particle size is beneficial to improve the exposure depth.The anti-sliding performance of exposed concrete is not necessarily proportional to its macro texture size,and too large aggregate particle size is not conducive to the anti-sliding performance of pavement.The macro-texture attenuation resistance,anti-sliding performance and noise reduction performance of the two kinds of exposed concrete are obviously superior to the grooved pavement,but close to the SMA-13 pavement,and the performance of the small-particle EAC1 pavement is better.