本文選題：再生混凝土 + 鋼纖維��； 參考：《長沙理工大學(xué)》2015年碩士論文

【摘要】：再生混凝土作為一種“綠色”混凝土,不僅可以降低成本、節(jié)約資源,同時也可以減輕對環(huán)境的污染。目前再生混凝土在實際工程中已得到許多應(yīng)用,對再生骨料、再生混凝土性能及應(yīng)用的研究工作也日益受到重視。本文通過正交試驗,研究水灰比、砂率、取代率對再生混凝土性能的影響；從而選定一組最佳的配合比,研究再生混凝土的耐磨性、抗沖擊性以及鋼纖維的加入對其性能的影響；并提出了兩種新型取代方式,研究了在不同取代方式下再生混凝土的早期抗壓強度。本文主要研究內(nèi)容及成果如下：1、設(shè)計兩種級配方式,分別采用兩種級配方式對再生粗骨料的表觀密度、堆積密度、吸水率和壓碎指標(biāo)進(jìn)行試驗研究,最后通過綜合分析選取一種性能較優(yōu)的級配方式,并確定再生粗骨料等級；2、選取水灰比、再生粗骨料取代率、砂率三個影響因素,以再生粗骨料水泥混凝土的抗壓強度和抗折強度作為試驗指標(biāo),通過正交試驗極差分析,得到了三個因素對再生粗骨料水泥混凝土性能影響的主次順序,并通過綜合分析,選取最佳配合比和再生粗骨料取代率；3、進(jìn)行了再生粗骨料水泥混凝土的耐磨性和抗沖擊性試驗,通過試驗發(fā)現(xiàn),在滿足再生粗骨料水泥混凝土抗壓強度、抗折強度的同時,其耐磨性和抗沖擊性也良好,其抗沖擊性甚至優(yōu)于天然粗骨料水泥混凝土；4、提出兩種新型再生粗骨料取代方式：大粒徑取代方式、小粒徑取代方式,探討研究了在相同的取代率下,不同取代方式對再生粗骨料水泥混凝土早期抗壓強度的影響。試驗結(jié)果表明,無論在何種取代率下,大粒徑取代方式下再生粗骨料水泥混凝土的早期抗壓強度最優(yōu),其次是全粒徑取代,再次是小粒徑取代。5、試驗研究了鋼纖維再生粗骨料水泥混凝土及鋼纖維天然粗骨料水泥混凝土28天抗壓強度、抗折強度和抗沖擊性能。研究表明,適量鋼纖維的加入可以大幅度提高再生粗骨料水泥混凝土和天然粗骨料水泥混凝土的抗壓強度、抗折強度和抗沖擊性能。本文提出的再生粗骨料水泥混凝土配合比設(shè)計技術(shù)在長沙市黃興南路改公交車道等項目中得到了應(yīng)用,節(jié)省了工程投資,取得了顯著的社會、環(huán)境和經(jīng)濟效益。
[Abstract]:As a kind of "green" concrete, recycled concrete can not only reduce the cost, save the resources, but also reduce the pollution to the environment. At present, recycled concrete has been used in many practical projects, and the research work on recycled aggregate, recycled concrete performance and its application has been paid more and more attention. In this paper, the effects of water-cement ratio, sand ratio and substitution rate on the properties of recycled concrete are studied by orthogonal test, and the wear resistance of recycled concrete is studied by selecting a group of optimum mix ratio. The impact resistance and the effect of steel fiber addition on the properties of recycled concrete were studied, and two new substitution methods were proposed to study the early compressive strength of recycled concrete. The main contents and results of this paper are as follows: 1. Two gradation methods are designed. The apparent density, accumulation density, water absorption and crushing index of recycled coarse aggregate are studied by using two gradation methods, respectively. Finally, by synthetically analyzing and selecting a better gradation method, three influencing factors are determined: grade 2 of recycled coarse aggregate, ratio of water to cement, replacement rate of regenerated coarse aggregate, sand rate, etc. The compressive strength and flexural strength of recycled coarse aggregate cement concrete are taken as the test indexes. By means of orthogonal test range analysis, the primary and secondary order of three factors affecting the performance of recycled coarse aggregate cement concrete is obtained, and the comprehensive analysis is carried out. The wear resistance and impact resistance of recycled coarse aggregate cement concrete were tested by selecting the optimum mix ratio and the replacement ratio of recycled coarse aggregate. It was found that the compressive strength and flexural strength of recycled coarse aggregate cement concrete were satisfied at the same time. Its wear resistance and impact resistance are also good, and its impact resistance is even better than that of natural coarse aggregate cement concrete. The influence of different substitution methods on the early compressive strength of recycled coarse aggregate cement concrete under the same substitution rate was studied. The experimental results show that the early compressive strength of recycled coarse aggregate cement concrete is the best under the substitution rate of large particle size, followed by the replacement of total particle size. Second, the small particle size replaced .5. the compressive strength, flexural strength and impact resistance of steel fiber regenerated coarse aggregate cement concrete and steel fiber natural coarse aggregate cement concrete were studied in 28 days. The results show that the compressive strength, flexural strength and impact resistance of recycled coarse aggregate cement concrete and natural coarse aggregate cement concrete can be greatly improved by adding appropriate steel fiber. In this paper, the design technology of recycled coarse aggregate cement concrete mixture ratio has been applied in the transformation of Huangxing South Road to bus path in Changsha City, which has saved the project investment and achieved remarkable social, environmental and economic benefits.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

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本文編號：1888030