工业固废新型混凝土作为公路建筑材料的性能评价

Performance Evaluation of New Industrial Solid Waste Concrete as Highway Building Material

为充分利用工业固废(粉煤灰+炉渣)研制新型混凝土建筑材料在公路路堤、公路路面基层以及次基层的适用性,通过对不同水泥掺量(0%、2%、4%、6%、8%)、不同炉渣掺量(0%、10%、20%、30%、40%)进行压实实验和无侧限抗压强度实验。研究结果表明:随着水泥掺量或炉渣掺量的增加,压实混合料的最大干密度增大,最佳含水率减小,水泥-粉煤灰-炉渣混合料的最大干密度比类似级配的天然砂粉粒径的最大干密度低,有利于在可压缩性土体上建造轻型路堤;工业固废混凝土承载比随着水泥掺量的增加而提高,水泥掺量一定时,工业固废混凝土承载比随着炉渣掺量的增加而提高,表明在适当的配合比组合下,其适用于公路路面的基层和次基层。

In order to make full use of industrial solid waste(fly ash+slag)to develop the applicability of new concrete building materials in highway embankment,highway pavement base and sub base,the compaction experiment and unconfined compressive strength experiment are carried out with different cement contents(0%,2%,4%,6%,8%)and different slag contents(0%,10%,20%,30%,40%).The research results show that:with the increase of cement content or slag content,the maximum dry density of compacted mixture increases,the optimum moisture content decreases,and the maximum dry density of cement-fly ash-slag mixture is lower than that of natural sand grain size with similar gradation,which is conducive to the construction of light embankment on compressible soil;the bearing ratio of industrial solid waste concrete increases with the increase of cement content.When the cement content is fixed,the bearing ratio of industrial solid waste concrete increases with the increase of slag content.It shows that under the appropriate mix proportion combination,it is suitable for the base and sub base of highway pavement.