Study on Experimental Performance and Road Performance of Tunnel Exposed Concrete Pavement
Two kinds of mixture ratios,EAC1 with smaller aggregate size and EAC2 with larger aggre-gate 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 reduc-tion 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 pe-riod is shortened continuously.It is recommended that the spraying amount of 6％exposure agent so-lution is between 250-300 g/m2.Under the same spraying amount of exposure agent solution,increas-ing 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 par-ticle 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 con-crete 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.
road worksexposed stone depthcleaning timeanti-sliding performanceroad perform-ance
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