Preparation Of Industrial Solid Waste Composite Gel Material And Its Road Application In Engineering

At present,China industrialization process is in a stage of rapid development,and a large amount of industrial solid waste is generated while industrialization is advancing rapidly.The low utilization rate of industrial solid waste results in a large amount of accumulation,and the large amount of accumulated solid waste will pollute the atmosphere,water bodies and even endanger human health.How to rationally utilize industrial solid waste has become the focus of the government.In recent years,the preparation of building materials from industrial solid waste is an effective way of large-scale and rational utilization of solid waste,but the contradiction between the comprehensive utilization rate of solid waste and the added value of products in the process hinders the further development of this way.This paper aims to solve the massive accumulation and low utilization rate of industrial solid waste,combined with the synergistic effect of solid waste,composite industrial solid waste into hydraulic binder,and use it to stabilize crushed stone and soil to be suitable for road base and roadbed.In this paper,the optimal ratio of steel slag,fly ash and slag is firstly optimized by mechanical property test,and the action mechanism of solid waste binder is analyzed by XRD,TG and SEM test results;It is used to stabilize the subgrade soil,to study the influence of the amount of solid waste on the mechanical properties and durability of the subgrade soil,and to analyze the interaction mechanism between the solid waste and the soil by XRD and SEM;finally,the solid waste binder is used to stabilize the subgrade soil.The influence of solid waste content on the mechanical properties and durability of the base was studied.The specific research contents and conclusions are as follows:(1)Steel slag,fly ash and blast furnace granulated slag are selected as the main raw materials for the preparation of industrial solid waste composite binder.First,their chemical composition,mineral composition and microscopic morphology were studied.Secondly,the optimal ratio of tapping slag/fly ash/slag is 2:3:5 through the mechanical properties of the solid waste binder with different mix ratios.The 28 d compressive strength of solid waste binder can reach 46.15 MPa,and the 28 d flexural strength can reach 11.7MPa.From the microscopic test,it was found that the number of C-S-H formed by the hydration of the solid waste binder was significantly higher than that of the cement,and the needle-shaped ettringite was interwoven in the plate-shaped C-S-H.However,there are some pores in the solid waste gel material,which is the reason for its poor resistance to water damage.In addition,it was found that the solid waste binder is highly sensitive to temperature,which is mainly caused by the large amount of metallic minerals.(2)By studying the performance of stabilized silt soil of industrial solid waste composite binder,it is found that,affected by the density of solid waste raw materials,the maximum dry density of stabilized soil mixture increases with the increase of solid waste content;4% solid waste stabilized soil The mechanical properties are close to or even exceed 4% cement-stabilized soil.Similarly,the mechanical properties of solid waste-stabilized silt soil increase with the increase of solid waste content.This is because a large amount of solid waste results in an increase in hydration products and a denser structure.Caused.In addition,due to the influence of temperature-sensitive metal minerals,the temperature shrinkage of solid waste stabilized soil is higher than that of cement stabilized soil.(3)By studying the stable crushed stone properties of industrial solid waste composite binder,it is found that the influence of solid waste content on the mechanical properties of base samples is similar to that of roadbed samples.The difference is that the dry shrinkage performance of the solid waste stabilized macadam is obviously better than that of the cement stabilized macadam sample,which is caused by the steel slag in the solid waste material,and the micro-expansion of the steel slag reduces the dry shrinkage deformation of the base to a certain extent.In addition,the anti-scour and anti-freeze-thaw tests show that the 3% and 4% solid waste stabilized macadam samples are easily immersed in the interior of the sample during the moisture erosion process,while the moisture is very sensitive to the 5% and 6% solid waste stabilized macadam samples.The damage is only the outer surface damage.