Study On Preparation And Properties Of Artificial Stone Based On Solid Waste

With the vigorous development of the construction industry,the demand for building decoration materials is continuously expanding.With its many advantages such as smooth surface,beautiful appearance,durability,and strong plasticity,artificial stone has gradually bloomed its own in modern building decoration projects.Light.Among them,solid wastebased artificial stone has also emerged,but as a new type of building material,the existing solid waste-based artificial stone still has some problems to be solved in the production technology,especially the low solid waste mixing ratio and organic additives The high production cost of adhesives and the inability of product strength and weather resistance to meet the standard requirements are the technical bottlenecks restricting the application of solid waste artificial stone industry.Based on the above-mentioned problems,this subject mainly carried out the research on the molding and curing process of solid waste-based artificial stone.The research content and research results are as follows:(1)The artificial stone test block is prepared by using the total solid waste composite powder as the raw material.First,the influence of the molding pressure and the amount of material(the thickness of the test block)on the compressive strength of the test block is studied.The results show that when the molding pressure is in the range of 20MPa-60 MPa,with the increase of molding pressure,the compressive strength and density of the test block increase,but the increase of the compressive strength and density of the test block at the initial stage of the molding pressure increases,and the increase is smaller in the later stage..When the molding pressure increases from 20 MPa to 50 MPa,the compressive strength and density of the test block increase greatly,the average increase is about 11.5% and 2.9%,respectively.When the molding pressure is increased from 50 MPa to 60 MPa,the compressive strength and density of the test block increase The increase was small,about3.5% and 1.4% respectively.Increasing molding pressure is conducive to material compaction,thereby improving the strength and compactness of the test block.However,if the pressure is too high,not only the range of increasing the strength of the test block is limited,but also the pressing equipment requires high and high energy consumption.Considering the two aspects of strength comprehensively,the molding pressure under the experimental conditions can be preferentially selected as 50 MPa,and the compressive strengths of the corresponding test block for 1 day,3 days and 7 days are 47 MPa,58 MPa and 67 MPa,respectively.Under the same molding pressure of 50 MPa,when the amount of materials formed at a time is 75 g,100g and 125 g,the corresponding test block thickness is17.5mm,23.5mm and 30 mm,and the corresponding 1-day compressive strength is 47.2MPa,35.0MPa and 29.5MPa.The thicker,the lower the 1-day strength of the corresponding test block.(2)Choose to prepare cemented test block with total solid waste composite powder as raw material,and improve the product’s performance by adding other components(fiber,mineral wool,slag)and using organic solvents(styrene-acrylic emulsion,epoxy resin).The compressive strength provides a reference for the preparation of artificial marble in the later period.Studies have shown that adding a certain amount of fiber,mineral wool and slag is beneficial to increase the late strength of the test block,but it is not good for the early strength of the test block.When 0.5% fiber,0.5% mineral wool and 30% slag are added,the7-day strength of the test block is increased by 22.5%,7.5%,and 15.2%,but the 1-day strength is decreased by 13.7%,15.4%,and 17.8,respectively.%.Adding less than 5% of the styrene-acrylic emulsion,the 1-day strength of the test block is significantly reduced,and the 7-day strength is slightly reduced.It is recommended not to use it in the industry;adding less than 2% of the epoxy resin,the 1-day strength of the test block is reduced by about 22.5%,7 The day strength increased by about 11.3%.Compared with the blank sample(no added sample),the addition of steel wire netting can significantly increase the compressive strength of the test block.The corresponding test block’s 1d,3d,and 7d compressive strengths reach 49.1MPa,64.5MPa and 95 MPa,respectively,with an increase of 4%.,21.1% and 41.6%.With the addition of steel mesh and 0.5% fiber composite,the compressive strength of the test block is further increased,corresponding to the 1d,3d,and7 d compressive strengths of the test blocks reaching 57.1MPa,73.4MPa and 110 MPa,respectively,the increase rate is about 21%,37.7% and 63.9%.(3)Mainly explore the influence of the curing system on the strength of the solid wastebased artificial stone cemented test block.The results show that after 3 days of curing of the test block,when the curing age is the same,the strength of the test block is: natural curing<hydrothermal curing <natural curing + hot water curing <hydrothermal curing + hot water curing;adopting “hydrothermal curing + hot water” The "maintenance" curing system can obtain solid waste-based high-strength test blocks with a 28 d strength of 145.5MPa,which meets the strength index of high-quality natural stone(MU100),indicating that industrial solid waste can be used to prepare high-quality artificial stone.Among them,under different curing conditions,for 28 days,the corresponding test block of hydrothermal curing increased by 176% compared with the natural curing,and the test block after hot water curing increased by 15.6% compared with the test block of hydrothermal curing.Compared with natural curing,autoclaved curing has an intensity increase of 62%,but compared with hot water curing,the intensity of the test block decreases by 96%.Compared with autoclaved curing,the intensity of 70℃ hot water curing for 1 day,3 days and 7 days reaches90%,152.5% and 188.9%,respectively.Hot water curing has obvious advantages over autoclaved curing.(4)Carry out industrial application research experiments with Shanxi Liheng Environmental Protection Technology Itd.’s existing fly ash brick production system.Calcium carbide slag is used as a substitute for quicklime.The powdered coal furnace ash and fluidized bed ash are respectively compounded with calcium carbide slag,and desulfurized gypsum is added to prepare solid waste non-burning bricks.The results show that in autoclaved curing,when the proportion of calcium carbide slag is 30%,a good gelation effect is achieved;among them,the effect of pulverized coal furnace ash is better than that of fluidized bed ash,which meets production requirements and reaches MU25 strength grade.After hot water curing,the compressive strength of fluidized bed ash and pulverized coal ash has been greatly improved;compared with autoclaved,the compressive strength of pulverized coal ash has increased by nearly 60%,while the compressive strength of fluidized bed ash The strength increased by 175%,even exceeding the MU25 strength grade,reaching 39 MPa.This provides an advantageous way for the resource utilization of fluidized bed fly ash.