Application And Experimental Study Of Waste Glass On Mortar And Sleeper Concrete

On the one hand,the construction industry,including the construction of railway facilities,continues to develop rapidly,so the demand for sand and gravel resources is also growing,but sand and gravel resources is in short supply.On the other hand,the piles of discarded glass are waiting to be disposed.In addition,there are few studies on the impermeability of waste glass mortar,the application of waste glass fiber-glass sand cement-based composite materials and glass sand in sleeper concrete.Therefore,in this paper,recycled waste glass was applied to cement-based materials instead of natural sand.The workability,physical and mechanical properties and durability of waste glass mortar and concrete were systematically studied.Moreover,waste glass fiber-glass sand composite mortar was proposed.Based on the experimental research,optimum content of glass sand and glass fiber were obtained.Finally,a kind of concrete for sleepers containing 100%waste glass fine aggregate was developed.The results of the paper can be summarized into three points:(1)The density,fluidity,consistency,mechanical properties,and impermeability of mortar were tested by using recycled waste glass sand instead of natural sand.The test results show that as the glass sand content increases,the density and fluidity of mortar decrease while the consistency increases.The compressive and flexural strength also decrease,but the strength requirement is reached at 40%glass content.Impermeability decreases first and then increases,and the impermeability is lowest at 60-80%,but replacement of cement with 10%metakaolin can enhance its impermeability.By means of SEM micromorphological analysis,it was found that the mortar has the largest microscopic porosity.Finally,through regression analysis,a multivariate regression model of glass sand,metakaolin and impermeability was established,which provided reference for the study on impermeability of glass sand cement-based materials.(2)The waste glass fibers with volume content of 0.5%,1%,and 1.5%were respectively mixed into waste glass mortar to test the workability and mechanical properties of new mortar.The test results show that the addition of glass fiber reduces the fluidity and compressive strength of the mortar,but has a positive effect on flexural strength.When the glass fiber content is constant,mortar with 40%glass sand content can achieve the best compressive and flexural strength,and comprehensively analyze the mechanical strength test results to obtain 1%as optimum glass fiber content.This research further promotes the application of solid waste materials in cement-based composites.(3)Based on the existing mix proportion of sleeper concrete,the slump,density and mechanical properties(compressive strength,flexural strength and splitting tensile strength)were studied.And there was the same gradation between glass sand and natural sand.Moreover,the application feasibility of glass sand concrete sleeper was discussed.The test results show that the addition of glass sand greatly increases the slump of the concrete,and the density rises first and then falls.Under standard curing conditions,the addition of glass sand can improve the compressive,flexural and splitting tensile strength of sleeper concrete,and the optimum glass sand content is 20%.The performance difference of glass sand concrete under steam curing and standard curing was further compared.Compared with concrete used natural aggregate,steaming curing can improve the strength of glass sand concrete more obviously.Finally,through comprehensive analysis,the mix proportion of sleeper concrete was optimized,and steam curing concrete for sleepers with 100%waste glass sand was obtained.The mechanical properties are better than the existing sleeper concrete,and its application is feasible.