Study On Glass Aggregate Interface Strengthening And Anti-efflorescence Of Inorganic Artificial Stone

High-quality mineral aggregates required for inorganic artificial stone（IAS）slab are increasingly in short supply.China produces a large amount of waste glass every year,and replacing some mineral aggregates to prepare IAS after crushing can effectively improve the decorative effect of the slab,and at the same time has the significance of resource recycling and energy conservation and environmental protection.Due to the dense and smooth surface of the glass aggregate and the weak adhesion with the gel,it is easy to stripping off during the process of IAS thickness shaving,and the widespread efforescence problem of dark IAS leads to a decrease in the yield of the slab.Solving the problem of glass aggregate stripping and efforescence is of great significance to optimize the quality of IAS products and the comprehensive utilization of waste glass.In this paper,the influence of each component material on the physical and mechanical properties of IAS is studied and then the composition and ratio of IAS materials are optimized;the influence of glass aggregate on the physical and mechanical properties of IAS is explored and the aggregate gradation of IAS is optimized based on fractal theory;the interface of IAS glass aggregate was strengthened by silica fume and three interfacial agents and its mechanism was explored;quantitative evaluation of IAS efforescence degree by efflorescence area ratio and efflorescence uniformity,dark IAS with low efforescence was prepared according to the principle of optimal anti-efforescence.The results show that:（1）Component materials are the basis for regulating the properties of IAS.Adding appropriate amount of water reducing agent and quartz powder can improve the physical and mechanical properties of IAS,and effectively solve the dispersion and compactness of materials under the condition of ultra-low water-binder ratio（0.22）.The appropriate amount of silica fume can greatly improve the strength of IAS and reduce the water absorption of the plate.Latex powder can adjust the rheology and cohesiveness of IAS mixture and improve the flexural strength.Adding appropriate amount of calcium chloride can greatly improve the early strength of IAS.（2）Fractal theory can accurately evaluate IAS aggregate grading.Based on fractal theory,the optimal fractal dimension of aggregate gradation ranges from 2.23 to 2.27.Substitution rates of up to 40%can be achieved by using glass aggregates instead of quartz aggregates in IAS without significant negative effects on their performance.（3）Glass aggregate pre-wrapped interface agent is an effective measure to improve the anti-stripping property of glass aggregate.The three interface agents used in the experiment can improve the mechanical properties of IAS and significantly reduce the amount of stripping of glass aggregate.Among them,the composite interface agent of white sulfur aluminum cement and latex powder has the best effect on the interface enhancement of IAS glass aggregate.Silica fume can improve the microhardness of IAS interface,reduce the content of interface Ca（OH）₂ and the degree of Ca（OH）₂ orientation,but can not reduce the stripping rate of glass aggregate.（4）The use of 8031H latex powder with strong hydrophobicity can effectively improve the comprehensive resistance to efforescence of IAS,and the use of metakaolin,silica fallow and ternary cementitious materials can effectively inhibit the secondary efforescence of IAS;Low efforescence dark IAS plate was successfully prepared by comprehensive measures.