Study On Lightweight And Mechanical Properties Of Prefabricated Composite Board Of High Titanium Heavy Slag Concrete

There has been a problem in domestic assembled structure that the prefabricated composite board is often “overweight”,which affects the production and popularization of composite board.Aimed at this,the subject develops a lightweight composite board by using the solid waste of high-titanium blast furnace slag from Panzhihua Iron and Steel Co.,Ltd.as coarse and fine aggregate in concrete,and studies the mechanical properties of its limit state for normal use and the ultimate capacity of its load-bearing.The research results have a positive theoretical and application value for the reuse of high-titanium blast furnace slag as a industrial solid waste resource,for the protection of the ecological environment in the upper reaches of the Yangtze River,for the formation of new application standards for the solid waste materials industry,and for the promotion of the development of fabricated buildings.The subject uses the weight and strength of the concrete used for the lightweight composite board as technical control indexes.And the full-scale model test is used for the study of the light weight and the mechanical properties of the composite board from the aspects of material and component.According to this research,the main conclusions are as follows:(1)The addition of shale ceramsite and superplasticizer and other mineral admixtures to the concrete reduces the weight of the high-titanium blast furnace slag concrete laminate.Tests have shown that the density of high-titanium blast furnace slag concrete is reduced by11.9% compared with ordinary concrete under the same design conditions(common concrete density is calculated as 2450 kg/m3).Considering economic factors,in the case of a certain amount of shale ceramsite blending,the most important influence on the density of high-titanium blast furnace slag concrete is the water-to-binder ratio,followed by the water reducing agent.(2)The most important factor affecting the compressive strength and splitting tensile strength of high-titanium heavy slag concrete is the water-to-binder ratio.With the increase of water-to-binder ratio,the compressive strength of concrete decreases gradually,and the tensile strength of splitting increases first and then increases.When the water-to-binder ratio is 0.45,the cracking tensile strength of high-titanium heavy slag concrete is the lowest.The blending amount of fly ash has a significant effect on the compressive strength of high-titanium heavy slag concrete in the early stage.With the increase of the blending amount,the compressive strength of concrete shows a downward trend..(3)The experimental cracking load of the high-titanium blast furnace slag concrete composite slab is close to the design cracking load,indicating that the existence of truss ribsin the high-titanium blast furnace slag concrete composite slab has little effect on the cracking load of the composite slab.(4)The ultimate bearing capacity of the high-titanium blast furnace slag lightweight composite board calculated by the plastic hinge method is small,so the method is suitable for solving the ultimate bearing capacity of the high-titanium blast furnace slag lightweight composite board.(5)The finite element simulation analysis of the bending mechanical properties of high-titanium blast furnace slag lightweight composite slabs shows that the finite element simulation results are basically consistent with the bending mechanical properties of high-titanium blast furnace slag lightweight composite slabs,indicating that the high-titanium blast furnace slag is based on The finite element analysis of the concrete plastic damage constitutive model is accurate and reliable,which provides a theoretical basis for the lightweight application of the high titanium blast furnace slag concrete in other fabricated prefabricated components.