透水砖铺装面层抗冻性能实验

EXPERIMENTAL STUDY ON FROST RESISTANCE PERFORMANCE OF PERMEABLE BRICK PAVEMENT

透水铺装是雨水源头减排的重要技术之一,其在寒冷地区冻胀损坏是亟待解决的突出问题。透水砖是广泛采用的透水铺装材料,通过冻融循环实验,对透水砖铺装面层不同孔隙率、水饱和度及不同透水基层厚度条件下的面层抗冻性进行研究,结果表明:面层孔隙率与其抗冻性能呈负相关,孔隙率越高,面层抗冻性能越差。面层水饱和度与其抗冻性能呈负相关,水饱和度越高,抗冻性能越差;面层水饱和度90%是产生冻胀损坏的临界值,当面层水饱和度<90%时,其抗冻性能受损较小;当面层水饱和度>90%时,其抗冻性能明显变差。透水基层厚度对透水砖铺装面层抗冻性的影响较小。3个主要因素对透水砖铺装面层抗冻性能影响程度顺序为:面层水饱和度>面层孔隙率>透水基层厚度。

Permeable pavement is one of the key technologies for stormwater runoff emission reduction,of which the frost heaving damage in cold area is an urgent problem.Permeable bricks are widely used pervious pavement materials.The frost resistance of permeable pavement surface in different porosity,water saturation and permeable base thickness was studied through the freeze-thaw cycle experiments.The results showed that the porosity of the surface layer had a negative correlation with its frost resistance,and the higher porosity,the worse frost resistance of the surface layer.There was a negative correlation between the surface water saturation and its frost resistance,also.The frost resistance descended as the water saturation increased.The critical value of the surface water saturation for frost heave damage was 90%.When the water saturation of the surface layer was lower than 90%,the frost resistance was less damaged;when the water saturation of the surface layer was higher than 90%,the frost resistance got obviously worse.The thickness of permeable base had little effect on the frost resistance of permeable pavement.The three main influencing factors on the frost resistance of permeable pavement surface were in the extent sequence of water saturation>porosity>thickness of permeable base.