發(fā)布時(shí)間：2018-07-16 21:03

【摘要】：纖維再生磚(骨料)混凝土是指以再生磚骨料為基體材料并在其中摻入纖維而制成的新型纖維增強(qiáng)生態(tài)材料。纖維再生磚骨料混凝土作為一種新型生態(tài)材料,能夠克服傳統(tǒng)生態(tài)材料強(qiáng)度低,延性差,易開裂等缺點(diǎn),極大地提高了其抗拉強(qiáng)度,增強(qiáng)了其耐久性,不但使建筑垃圾(尤其是建筑廢棄磚瓦)得到合理的利用,實(shí)現(xiàn)資源的可持續(xù)發(fā)展和對(duì)環(huán)境的保護(hù),又解決了課題組中高層生態(tài)復(fù)合墻體對(duì)新型內(nèi)填材料的需求問題。為使這種新型材料能更好地推廣與運(yùn)用,本文采用試驗(yàn)和理論分析相結(jié)合的方法,擬對(duì)纖維再生磚混凝土的基本力學(xué)性能和受壓本構(gòu)模型進(jìn)行研究,本文主要研究?jī)?nèi)容包括:1.選用聚丙烯纖維和鋼纖維來配置聚丙烯纖維再生磚混凝土和鋼纖維再生磚混凝土,采用正交試驗(yàn)設(shè)計(jì)方法,進(jìn)行纖維含量、水灰比、取代率等關(guān)鍵因素對(duì)材料強(qiáng)度的敏感性分析,并優(yōu)化其組分及配比,初步確定纖維再生磚混凝土的最優(yōu)工藝組合。試驗(yàn)結(jié)果及分析表明:對(duì)于聚丙烯纖維再生磚混凝土的立方體抗壓強(qiáng)度和立方體劈裂抗拉強(qiáng)度,各因素的影響順序?yàn)樗冶壤w維含量取代率;對(duì)于鋼纖維再生磚混凝土的立方體抗壓強(qiáng)度,各因素的影響順序?yàn)樗冶壤w維含量取代率,對(duì)于鋼纖維再生磚混凝土的立方體劈裂抗拉強(qiáng)度,各因素的影響順序?yàn)槔w維含量水灰比取代率。2.采用單因素試驗(yàn)方法研究聚丙烯纖維再生磚混凝土和鋼纖維再生磚混凝土的受壓破壞過程和裂縫形態(tài),探討纖維摻量對(duì)這兩種材料的軸心抗壓強(qiáng)度、彈性模量、強(qiáng)度換算關(guān)系的影響趨勢(shì),并給出聚丙烯纖維再生磚混凝土立方體抗壓強(qiáng)度和軸心抗壓強(qiáng)度之間的強(qiáng)度比值系數(shù)和立方體抗壓強(qiáng)度與劈裂抗拉強(qiáng)度之間的經(jīng)驗(yàn)公式。試驗(yàn)結(jié)果及分析表明:纖維能提高再生磚混凝土的軸心抗壓強(qiáng)度,但提高幅度有限;纖維降低了再生磚混凝土的彈性模量。3.采用單因素試驗(yàn)的方法對(duì)聚丙烯纖維再生磚混凝土和鋼纖維再生磚混凝土的棱柱體試塊進(jìn)行單軸受壓試驗(yàn)研究,測(cè)定其單軸受壓應(yīng)力-應(yīng)變?nèi)�,并分析纖維摻量對(duì)受壓全曲線上的特征參數(shù)和韌性指數(shù)的影響;基于試驗(yàn)結(jié)果,提出了符合纖維再生磚混凝土的受壓本構(gòu)模型,并結(jié)合損傷理論給出了纖維再生磚混凝土的損傷本構(gòu)模型,研究了纖維再生磚混凝土的損傷演化曲線。試驗(yàn)結(jié)果及分析表明:纖維能有效抑制裂縫的發(fā)展,提高混凝土的變形能力,改善混凝土的韌性,有效抑制混凝土損傷的發(fā)展。
[Abstract]:Fiber recycled brick (aggregate) concrete is a new fiber reinforced ecological material which is made of recycled brick aggregate as matrix material and mixed with fiber. As a new ecological material, fiber recycled brick aggregate concrete can overcome the disadvantages of low strength, poor ductility and easy cracking of traditional ecological materials, and greatly improve its tensile strength and durability. It not only makes the construction waste (especially the building waste brick and tile) get reasonable utilization, realizes the sustainable development of the resources and the protection of the environment, but also solves the problem of the demand for the new type inner filling material of the high-level ecological composite wall in the research group. In order to make this new material more popularized and applied, the basic mechanical properties and compressive constitutive model of fiber recycled brick concrete are studied in this paper by the method of combining test and theoretical analysis. The main contents of this paper include: 1. Polypropylene fiber and steel fiber were used to configure polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete. Orthogonal design method was used to carry out fiber content and water cement ratio. The key factors such as substitution ratio and so on are analyzed to the material strength, and its composition and ratio are optimized, and the optimum process combination of fiber recycled brick concrete is preliminarily determined. The experimental results and analysis show that: for the cube compressive strength and cube splitting tensile strength of polypropylene fiber recycled brick concrete, the influence order of each factor is water cement ratio fiber content substitution rate; For the cube compressive strength of steel fiber recycled brick concrete, the influence order of each factor is the substitution ratio of water cement ratio fiber content, and the cube splitting tensile strength of steel fiber regenerated brick concrete. The influence order of each factor is the substitution ratio of water to cement ratio of fiber content. The compressive failure process and crack morphology of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete were studied by single factor test method, and the axial compressive strength and elastic modulus of the two materials were discussed. The influence trend of strength conversion relation is given, and the empirical formula between cube compressive strength and axial compressive strength of polypropylene fiber recycled brick concrete and the empirical formula between cube compressive strength and split tensile strength are given. The experimental results and analysis show that the fiber can improve the axial compressive strength of recycled brick concrete, but the range is limited, and the fiber reduces the elastic modulus of recycled brick concrete. Uniaxial compression tests were carried out on the prisms of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete by single factor test method, and the full stress-strain curves of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete under uniaxial compression were measured. The influence of fiber content on the characteristic parameters and toughness index of the whole compression curve is analyzed, and based on the experimental results, the compressive constitutive model of fiber regenerated brick concrete is proposed. Based on the damage theory, the damage constitutive model of fiber recycled brick concrete is given, and the damage evolution curve of fiber recycled brick concrete is studied. The experimental results and analysis show that the fiber can effectively inhibit the development of cracks, improve the deformation ability of concrete, improve the toughness of concrete, and effectively inhibit the development of concrete damage.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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