建筑垃圾廢磚再生粗骨料混凝土及預(yù)制墻板受力性能研究
發(fā)布時(shí)間：2018-08-05 11:42
【摘要】：我國仍處于大規(guī)模的基本建設(shè)時(shí)期,新建工程和拆除舊有建筑產(chǎn)生了大量建筑垃圾,目前對(duì)建筑垃圾的處置方式主要是填埋與堆放,資源化再利用的比率很低,建筑垃圾大量填埋與堆放不僅侵占破壞土地,還嚴(yán)重污染環(huán)境。我國城鄉(xiāng)大量的舊建筑物以砌體結(jié)構(gòu)或混合結(jié)構(gòu)為主,建筑垃圾中廢磚所占的比例很大,但當(dāng)前對(duì)廢磚再生利用的研究較少。本文針對(duì)急待解決的大量廢磚建筑垃圾的再生利用問題,開展建筑垃圾廢磚再生粗骨料混凝土及預(yù)制墻板受力性能研究,力求將大量廢磚建筑垃圾開發(fā)為一種新型墻體材料。論文的研究內(nèi)容對(duì)促進(jìn)建筑垃圾的綜合利用,節(jié)約資源、保護(hù)環(huán)境具有重要意義,研究成果可供廢磚再生粗骨料混凝土預(yù)制墻板的工程應(yīng)用參考,對(duì)其他建筑垃圾的再生利用也有借鑒作用。論文研究工作得到了河南省新型墻材改革基金的資助。論文在對(duì)廢磚再生粗骨料和建筑垃圾再生細(xì)骨料的物理力學(xué)性能、廢磚再生混凝土的配合比和物理力學(xué)性能試驗(yàn)研究的基礎(chǔ)上,采用大粒徑廢磚再生粗骨料、廢混凝土再生細(xì)骨料制作了再生混凝土預(yù)制墻板,進(jìn)行了這種新型墻板在豎向荷載、平面外荷載和水平低周往復(fù)荷載作用下的受力性能試驗(yàn),并進(jìn)行了數(shù)值分析。根據(jù)研究結(jié)果并參考國內(nèi)外有關(guān)資料,提出了工程應(yīng)用的建議。論文的主要工作和成果有：1.采用廢棄粘土磚經(jīng)輕微破碎獲得大粒徑粗骨料,對(duì)廢磚再生粗骨料和廢混凝土再生細(xì)骨料的顆粒級(jí)配、表觀密度、堆積密度、空隙率、吸水率、壓碎指標(biāo)等物理力學(xué)性能進(jìn)行了較為系統(tǒng)的試驗(yàn)和分析,并與天然骨料進(jìn)行比較。結(jié)果表明建筑垃圾廢磚再生粗骨料強(qiáng)度較低,不適用于配制對(duì)強(qiáng)度要求較高的普通混凝土,但可用于配制對(duì)強(qiáng)度要求不高的墻板類構(gòu)件或其他墻體材料的混凝土；廢混凝土再生細(xì)骨料除吸水率較大外其他性能與天然砂相近,采取一定措施后可替代天然砂配制混凝土。2.采用100%大粒徑廢磚再生粗骨料和100%廢混凝土再生細(xì)骨料配置再生混凝土,根據(jù)廢磚再生粗骨料吸水率大、吸水速度快的特點(diǎn),采用預(yù)先添加附加水、二次攪拌的方法獲得拌合物具有較好工作性能、強(qiáng)度等級(jí)可達(dá)到C10-C20的廢磚再生混凝土；根據(jù)試驗(yàn)結(jié)果,給出了立方體抗壓強(qiáng)度隨凈水膠比變化的關(guān)系式。對(duì)廢磚再生粗骨料混凝土的抗壓強(qiáng)度、彈性模量以及收縮變形、碳化等物理力學(xué)性能進(jìn)行了試驗(yàn)研究,提出了廢磚再生粗骨料混凝土彈性模量計(jì)算公式和力學(xué)性能建議指標(biāo),為墻板計(jì)算分析和工程應(yīng)用提供了參考依據(jù)。3.制作了邊緣構(gòu)件為普通混凝土、芯部為大粒徑廢磚再生粗骨料混凝土組成的預(yù)制墻板,進(jìn)行墻板在豎向荷載和平面外荷載作用下的受力性能試驗(yàn)和分析。結(jié)果表明在平面內(nèi)豎向荷載作用下,邊緣構(gòu)件的普通混凝土和墻板芯部的廢磚再生粗骨料混凝土能共同受力,二種混凝土的強(qiáng)度均能較好發(fā)揮,建立了廢磚再生粗骨料混凝土預(yù)制墻板軸向受壓承載力的計(jì)算公式,公式的計(jì)算結(jié)果有較大安全儲(chǔ)備并可保證墻板在正常使用極限狀態(tài)下不出現(xiàn)裂縫；在大于可能承受的最大風(fēng)荷載的平面外均布荷載作用下,墻板側(cè)向撓度很小且未產(chǎn)生裂縫,在保證上、下兩端可靠連接的基礎(chǔ)上可不進(jìn)行專門的抗風(fēng)驗(yàn)算；基于彈性薄板理論和彈性支承邊界條件,推導(dǎo)出廢磚再生粗骨料混凝土預(yù)制墻板在平面外均布荷載作用下的位移、內(nèi)力、應(yīng)力和應(yīng)變等的計(jì)算公式,為墻板在平面外荷載作用下的受力分析提供了有效方法。4.進(jìn)行了廢磚再生粗骨料混凝土預(yù)制墻板在給定軸壓比下的水平低周往復(fù)加載試驗(yàn),對(duì)墻板開裂前后的滯回曲線、骨架曲線、剛度退化曲線、耗能和恢復(fù)性能、以及破壞特點(diǎn)等進(jìn)行了分析。結(jié)果表明廢磚再生混凝土預(yù)制墻板開裂前剛度退化不明顯,水平荷載穩(wěn)定；開裂后的耗能和變形能力均較好。參照深受彎構(gòu)件受剪承載力的計(jì)算方法,建立了考慮邊柱普通混凝土作用的廢磚再生混凝土預(yù)制墻板的受剪承載力計(jì)算公式,公式計(jì)算值與試驗(yàn)結(jié)果符合較好,可供廢磚再生混凝土預(yù)制墻板工程設(shè)計(jì)參考。5.引入廢磚再生粗骨料混凝土材料性能試驗(yàn)結(jié)果,運(yùn)用有限元軟件ABAQUS建立再生粗骨料混凝土墻板的分析模型,對(duì)廢磚再生粗骨料混凝土預(yù)制墻板在低周往復(fù)荷載作用下的受力性能進(jìn)行了數(shù)值分析并與試驗(yàn)結(jié)果比較。結(jié)果表明在各次荷載循環(huán)下數(shù)值分析的應(yīng)力狀態(tài)、滯回曲線、骨架曲線、耗能曲線、剛度退化曲線以及殘余變形均與試驗(yàn)實(shí)測結(jié)果接近;考慮廢磚再生粗骨料混凝土材料性能的有限元分析,可作為對(duì)廢磚再生粗骨料混凝土預(yù)制墻板受力性能分析的一種有效方法。6.根據(jù)試驗(yàn)研究成果并參考國內(nèi)外相關(guān)資料,提出了包括廢磚再生粗骨料混凝土預(yù)制墻板的制作、用于多層房屋承重墻體和框架結(jié)構(gòu)房屋外墻及隔墻的設(shè)計(jì)施工要點(diǎn)等內(nèi)容的工程應(yīng)用初步建議。結(jié)合我國建筑垃圾再生利用的現(xiàn)狀和存在的問題,提出了推廣廢磚再生混凝土預(yù)制墻板以及建筑垃圾處理和再生利用產(chǎn)業(yè)化的建議。
[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.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528
，
本文編號(hào)：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.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528
，
本文編號(hào)：2165689
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