建筑垃圾废砖再生粗骨料混凝土及预制墙板受力性能研究
发布时间：2018-08-05 11:42
【摘要】：我国仍处于大规模的基本建设时期,新建工程和拆除旧有建筑产生了大量建筑垃圾,目前对建筑垃圾的处置方式主要是填埋与堆放,资源化再利用的比率很低,建筑垃圾大量填埋与堆放不仅侵占破坏土地,还严重污染环境。我国城乡大量的旧建筑物以砌体结构或混合结构为主,建筑垃圾中废砖所占的比例很大,但当前对废砖再生利用的研究较少。本文针对急待解决的大量废砖建筑垃圾的再生利用问题,开展建筑垃圾废砖再生粗骨料混凝土及预制墙板受力性能研究,力求将大量废砖建筑垃圾开发为一种新型墙体材料。论文的研究内容对促进建筑垃圾的综合利用,节约资源、保护环境具有重要意义,研究成果可供废砖再生粗骨料混凝土预制墙板的工程应用参考,对其他建筑垃圾的再生利用也有借鉴作用。论文研究工作得到了河南省新型墙材改革基金的资助。论文在对废砖再生粗骨料和建筑垃圾再生细骨料的物理力学性能、废砖再生混凝土的配合比和物理力学性能试验研究的基础上,采用大粒径废砖再生粗骨料、废混凝土再生细骨料制作了再生混凝土预制墙板,进行了这种新型墙板在竖向荷载、平面外荷载和水平低周往复荷载作用下的受力性能试验,并进行了数值分析。根据研究结果并参考国内外有关资料,提出了工程应用的建议。论文的主要工作和成果有：1.采用废弃粘土砖经轻微破碎获得大粒径粗骨料,对废砖再生粗骨料和废混凝土再生细骨料的颗粒级配、表观密度、堆积密度、空隙率、吸水率、压碎指标等物理力学性能进行了较为系统的试验和分析,并与天然骨料进行比较。结果表明建筑垃圾废砖再生粗骨料强度较低,不适用于配制对强度要求较高的普通混凝土,但可用于配制对强度要求不高的墙板类构件或其他墙体材料的混凝土；废混凝土再生细骨料除吸水率较大外其他性能与天然砂相近,采取一定措施后可替代天然砂配制混凝土。2.采用100%大粒径废砖再生粗骨料和100%废混凝土再生细骨料配置再生混凝土,根据废砖再生粗骨料吸水率大、吸水速度快的特点,采用预先添加附加水、二次搅拌的方法获得拌合物具有较好工作性能、强度等级可达到C10-C20的废砖再生混凝土；根据试验结果,给出了立方体抗压强度随净水胶比变化的关系式。对废砖再生粗骨料混凝土的抗压强度、弹性模量以及收缩变形、碳化等物理力学性能进行了试验研究,提出了废砖再生粗骨料混凝土弹性模量计算公式和力学性能建议指标,为墙板计算分析和工程应用提供了参考依据。3.制作了边缘构件为普通混凝土、芯部为大粒径废砖再生粗骨料混凝土组成的预制墙板,进行墙板在竖向荷载和平面外荷载作用下的受力性能试验和分析。结果表明在平面内竖向荷载作用下,边缘构件的普通混凝土和墙板芯部的废砖再生粗骨料混凝土能共同受力,二种混凝土的强度均能较好发挥,建立了废砖再生粗骨料混凝土预制墙板轴向受压承载力的计算公式,公式的计算结果有较大安全储备并可保证墙板在正常使用极限状态下不出现裂缝；在大于可能承受的最大风荷载的平面外均布荷载作用下,墙板侧向挠度很小且未产生裂缝,在保证上、下两端可靠连接的基础上可不进行专门的抗风验算；基于弹性薄板理论和弹性支承边界条件,推导出废砖再生粗骨料混凝土预制墙板在平面外均布荷载作用下的位移、内力、应力和应变等的计算公式,为墙板在平面外荷载作用下的受力分析提供了有效方法。4.进行了废砖再生粗骨料混凝土预制墙板在给定轴压比下的水平低周往复加载试验,对墙板开裂前后的滞回曲线、骨架曲线、刚度退化曲线、耗能和恢复性能、以及破坏特点等进行了分析。结果表明废砖再生混凝土预制墙板开裂前刚度退化不明显,水平荷载稳定；开裂后的耗能和变形能力均较好。参照深受弯构件受剪承载力的计算方法,建立了考虑边柱普通混凝土作用的废砖再生混凝土预制墙板的受剪承载力计算公式,公式计算值与试验结果符合较好,可供废砖再生混凝土预制墙板工程设计参考。5.引入废砖再生粗骨料混凝土材料性能试验结果,运用有限元软件ABAQUS建立再生粗骨料混凝土墙板的分析模型,对废砖再生粗骨料混凝土预制墙板在低周往复荷载作用下的受力性能进行了数值分析并与试验结果比较。结果表明在各次荷载循环下数值分析的应力状态、滞回曲线、骨架曲线、耗能曲线、刚度退化曲线以及残余变形均与试验实测结果接近;考虑废砖再生粗骨料混凝土材料性能的有限元分析,可作为对废砖再生粗骨料混凝土预制墙板受力性能分析的一种有效方法。6.根据试验研究成果并参考国内外相关资料,提出了包括废砖再生粗骨料混凝土预制墙板的制作、用于多层房屋承重墙体和框架结构房屋外墙及隔墙的设计施工要点等内容的工程应用初步建议。结合我国建筑垃圾再生利用的现状和存在的问题,提出了推广废砖再生混凝土预制墙板以及建筑垃圾处理和再生利用产业化的建议。
[Abstract]:China is still in a large-scale construction period. The new construction and demolition of old buildings have produced a large amount of construction waste. At present, the disposal ways of construction waste are mainly landfills and stacking, the ratio of resource reuse is very low. A large number of landfill and stacking of construction waste not only invade and destroy the land, but also seriously pollutes the environment. The old buildings are mainly composed of masonry structure or mixed structure, and the proportion of waste bricks in construction waste is very large, but the research on recycling of waste bricks is less. The research content of this paper is of great significance to promoting the comprehensive utilization of building garbage, saving resources and protecting the environment. The research results can be used for the engineering application of waste brick regenerated coarse aggregate concrete prefabricated wall, and it also can be used for reference for the recycling of other building wastes. On the basis of the physical and mechanical properties of the recycled coarse aggregate and the recycled fine aggregate of the building waste, on the basis of the research on the mix ratio and the physical and mechanical properties of recycled brick recycled concrete, the recycled coarse aggregate of large size waste bricks and the regeneration of waste concrete are made in this paper. The paper is based on the physical and mechanical properties of recycled coarse aggregate and the recycled fine aggregate of building waste in Henan. The recycled concrete prefabricated wall plate is made by the aggregate, and the stress performance test of this new wall panel under the action of vertical load, plane load and horizontal low cycle reciprocating load is carried out, and the numerical analysis is carried out. Based on the results of the study and reference to the relevant data at home and abroad, the suggestions for the application of the work range are put forward. The main work and results of this paper are presented. 1. the large size coarse aggregate was obtained by the slight crushing of the abandoned clay brick. The particle size distribution of recycled coarse aggregate and recycled fine aggregate of waste concrete, apparent density, accumulation density, porosity, water absorption, crushing index and other physical mechanical properties were tested and analyzed systematically, and compared with natural aggregate. The results showed that the aggregate was compared with the natural aggregate. The recycled coarse aggregate of building waste brick is low in strength and is not suitable for preparing ordinary concrete with high strength requirements, but it can be used to prepare concrete for wall panels or other wall materials with low strength requirements. The recycled coarse aggregate and recycled fine aggregate of 100% waste concrete can be used as the substitute of natural sand in concrete.2. to configure recycled concrete. According to the characteristics of high water absorption and fast water absorption of recycled coarse aggregate, the mixture has good performance and strength grade by adding additional water in advance and mixing two times. The recycled concrete with C10-C20 can be reached. According to the test results, the relationship between the cube compressive strength and the change of water gel ratio is given. The compressive strength, elastic modulus, shrinkage deformation and carbonization of recycled coarse aggregate concrete are tested and the recycled coarse aggregate concrete is put forward. The formula for calculating the modulus of the modulus of sexual modulus and the index of mechanical properties provide reference for the calculation and analysis of the wall plate and the engineering application..3. made the prefabricated wall plate with the edge component as the ordinary concrete and the core for the recycled coarse aggregate concrete with large size scrap brick, and carried out the test of the stress performance of the wall plate under the vertical load and the outside load. The results show that under the vertical load in the plane, the common concrete and the waste brick recycled coarse aggregate concrete of the wall core can be subjected to the joint force, and the strength of the two kinds of concrete can be played well. The calculation formula of the axial compression bearing capacity of the recycled coarse aggregate concrete prefabricated wall slab is established, and the calculation result of the formula is obtained. There is a large safety reserve and can ensure that the wall panels do not appear cracks in the normal use limit state; the lateral deflection of the wallboard is very small and does not produce cracks under the surface evenly distributed load larger than the maximum wind load that the maximum wind load may bear. On the basis of the guarantee, a reliable wind resistance checking can not be carried out on the basis of the reliable connection between the two ends. The plate theory and the elastic support boundary condition are used to derive the calculation formula of displacement, internal force, stress and strain of the recycled coarse aggregate concrete prefabricated wall slab under flat surface load, which provides an effective method for the stress analysis of the wall plate under the action of the plane load..4. has been used for the recycled coarse aggregate concrete prefabricated wall. The hysteretic curve, skeleton curve, stiffness degradation curve, energy dissipation and recovery performance, and damage characteristics before and after the cracking of the panel are analyzed. The results show that the stiffness degradation before the cracking of the waste brick regenerated concrete prefabricated wall is not obvious, the horizontal load is stable, and the consumption after cracking. According to the calculation method of the shear bearing capacity of the flexural member, the formula of the shear bearing capacity of the waste brick regenerated concrete prefabricated wall slab is established in consideration of the common concrete action of the side column. The calculated value of the formula is in good agreement with the test results. It can be used as reference.5. for the engineering design of the regenerated concrete prefabricated wall slab. The experimental results of the recycled coarse aggregate concrete material performance test, using the finite element software ABAQUS to establish the analysis model of recycled coarse aggregate concrete wallboard, the numerical analysis of the stress performance of the recycled coarse aggregate concrete prefabricated wall slab under the low cycle reciprocating load is carried out and compared with the test results. The results show that the different loads are in every load. The stress state of the cyclic numerical analysis, the hysteresis curve, the skeleton curve, the energy dissipation curve, the stiffness degradation curve and the residual deformation are all close to the experimental results. Considering the finite element analysis of the properties of the recycled coarse aggregate concrete material, it can be used as an effective method for the analysis of the stress performance of the recycled coarse aggregate concrete prefabricated wall slab. Method.6. based on the results of the experiment and reference to the relevant data at home and abroad, this paper puts forward the preliminary construction of the construction of the prefabricated wall of the recycled coarse aggregate concrete, which is used for the design and construction of the wall and the partition wall of the multi storey building and the frame structure. Suggestions are put forward to promote the industrialization of waste brick recycled concrete prefabricated wallboard and construction waste treatment and recycling.
【学位授予单位】：郑州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU528
，
本文编号：2165689
[Abstract]:China is still in a large-scale construction period. The new construction and demolition of old buildings have produced a large amount of construction waste. At present, the disposal ways of construction waste are mainly landfills and stacking, the ratio of resource reuse is very low. A large number of landfill and stacking of construction waste not only invade and destroy the land, but also seriously pollutes the environment. The old buildings are mainly composed of masonry structure or mixed structure, and the proportion of waste bricks in construction waste is very large, but the research on recycling of waste bricks is less. The research content of this paper is of great significance to promoting the comprehensive utilization of building garbage, saving resources and protecting the environment. The research results can be used for the engineering application of waste brick regenerated coarse aggregate concrete prefabricated wall, and it also can be used for reference for the recycling of other building wastes. On the basis of the physical and mechanical properties of the recycled coarse aggregate and the recycled fine aggregate of the building waste, on the basis of the research on the mix ratio and the physical and mechanical properties of recycled brick recycled concrete, the recycled coarse aggregate of large size waste bricks and the regeneration of waste concrete are made in this paper. The paper is based on the physical and mechanical properties of recycled coarse aggregate and the recycled fine aggregate of building waste in Henan. The recycled concrete prefabricated wall plate is made by the aggregate, and the stress performance test of this new wall panel under the action of vertical load, plane load and horizontal low cycle reciprocating load is carried out, and the numerical analysis is carried out. Based on the results of the study and reference to the relevant data at home and abroad, the suggestions for the application of the work range are put forward. The main work and results of this paper are presented. 1. the large size coarse aggregate was obtained by the slight crushing of the abandoned clay brick. The particle size distribution of recycled coarse aggregate and recycled fine aggregate of waste concrete, apparent density, accumulation density, porosity, water absorption, crushing index and other physical mechanical properties were tested and analyzed systematically, and compared with natural aggregate. The results showed that the aggregate was compared with the natural aggregate. The recycled coarse aggregate of building waste brick is low in strength and is not suitable for preparing ordinary concrete with high strength requirements, but it can be used to prepare concrete for wall panels or other wall materials with low strength requirements. The recycled coarse aggregate and recycled fine aggregate of 100% waste concrete can be used as the substitute of natural sand in concrete.2. to configure recycled concrete. According to the characteristics of high water absorption and fast water absorption of recycled coarse aggregate, the mixture has good performance and strength grade by adding additional water in advance and mixing two times. The recycled concrete with C10-C20 can be reached. According to the test results, the relationship between the cube compressive strength and the change of water gel ratio is given. The compressive strength, elastic modulus, shrinkage deformation and carbonization of recycled coarse aggregate concrete are tested and the recycled coarse aggregate concrete is put forward. The formula for calculating the modulus of the modulus of sexual modulus and the index of mechanical properties provide reference for the calculation and analysis of the wall plate and the engineering application..3. made the prefabricated wall plate with the edge component as the ordinary concrete and the core for the recycled coarse aggregate concrete with large size scrap brick, and carried out the test of the stress performance of the wall plate under the vertical load and the outside load. The results show that under the vertical load in the plane, the common concrete and the waste brick recycled coarse aggregate concrete of the wall core can be subjected to the joint force, and the strength of the two kinds of concrete can be played well. The calculation formula of the axial compression bearing capacity of the recycled coarse aggregate concrete prefabricated wall slab is established, and the calculation result of the formula is obtained. There is a large safety reserve and can ensure that the wall panels do not appear cracks in the normal use limit state; the lateral deflection of the wallboard is very small and does not produce cracks under the surface evenly distributed load larger than the maximum wind load that the maximum wind load may bear. On the basis of the guarantee, a reliable wind resistance checking can not be carried out on the basis of the reliable connection between the two ends. The plate theory and the elastic support boundary condition are used to derive the calculation formula of displacement, internal force, stress and strain of the recycled coarse aggregate concrete prefabricated wall slab under flat surface load, which provides an effective method for the stress analysis of the wall plate under the action of the plane load..4. has been used for the recycled coarse aggregate concrete prefabricated wall. The hysteretic curve, skeleton curve, stiffness degradation curve, energy dissipation and recovery performance, and damage characteristics before and after the cracking of the panel are analyzed. The results show that the stiffness degradation before the cracking of the waste brick regenerated concrete prefabricated wall is not obvious, the horizontal load is stable, and the consumption after cracking. According to the calculation method of the shear bearing capacity of the flexural member, the formula of the shear bearing capacity of the waste brick regenerated concrete prefabricated wall slab is established in consideration of the common concrete action of the side column. The calculated value of the formula is in good agreement with the test results. It can be used as reference.5. for the engineering design of the regenerated concrete prefabricated wall slab. The experimental results of the recycled coarse aggregate concrete material performance test, using the finite element software ABAQUS to establish the analysis model of recycled coarse aggregate concrete wallboard, the numerical analysis of the stress performance of the recycled coarse aggregate concrete prefabricated wall slab under the low cycle reciprocating load is carried out and compared with the test results. The results show that the different loads are in every load. The stress state of the cyclic numerical analysis, the hysteresis curve, the skeleton curve, the energy dissipation curve, the stiffness degradation curve and the residual deformation are all close to the experimental results. Considering the finite element analysis of the properties of the recycled coarse aggregate concrete material, it can be used as an effective method for the analysis of the stress performance of the recycled coarse aggregate concrete prefabricated wall slab. Method.6. based on the results of the experiment and reference to the relevant data at home and abroad, this paper puts forward the preliminary construction of the construction of the prefabricated wall of the recycled coarse aggregate concrete, which is used for the design and construction of the wall and the partition wall of the multi storey building and the frame structure. Suggestions are put forward to promote the industrialization of waste brick recycled concrete prefabricated wallboard and construction waste treatment and recycling.
【学位授予单位】：郑州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU528
，
本文编号：2165689
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