本文關鍵詞：沙漠砂鋰渣聚丙烯纖維混凝土力學性能及耐久性試驗研究　出處：《新疆大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 沙漠砂混凝土 鋰渣 聚丙烯纖維 力學性能 耐久性

【摘要】：沙漠砂混凝土是一種新型環(huán)保型混凝土,將沙漠砂按一定比例替代普通中砂,配置出符合工程實際要求的混凝土。沙漠砂混凝土基本力學性能及耐久性能與一般混凝土十分相近,然而因其較易收縮開裂,抗?jié)B性不佳等問題而未被廣泛使用,為了改善沙漠砂混凝土以上各項性能,通過摻入礦物摻合料鋰渣和低彈性模量纖維的方法解決上述問題。鋰渣是鋰鹽生產加工流程中大規(guī)模排放的工業(yè)固體廢棄物,有效提高混凝土強度并改善混凝土抗?jié)B和抗凍等耐久性能,而聚丙烯纖維能大幅度提升混凝土內部結構整體性,對混凝土抗拉強度有明顯改善效用。新疆地區(qū)合理開發(fā)沙漠砂進行工程建設,降低工程造價,遏制荒漠化和沙塵暴,為生態(tài)環(huán)境做出貢獻,從發(fā)展的長遠角度看,有著深遠的經(jīng)濟效益和社會效益。本文通過將新疆托克遜縣沙漠砂按一定比例替代普通中砂配置混凝土,并利用工業(yè)廢棄物鋰渣和聚丙烯纖維對沙漠砂混凝土進行改性。對不同沙漠砂替代率下的鋰渣聚丙烯纖維混凝土部分基本力學性能及耐久性深入探討,分析了沙漠砂鋰渣聚丙烯纖維混凝土的立方體抗壓、劈裂抗拉、軸心抗壓、受壓應力—應變曲線等各項基本力學性能指標和抗凍性、抗?jié)B性。試驗研究表明:當沙漠砂替代率為30%時,試件力學及耐久性能最優(yōu)異,并且通過峰值應變與軸心抗壓強度數(shù)學表達式:εc=(80.02βfc-3737.86)×106,得到沙漠砂替代率影響系數(shù)。當摻入沙漠砂、聚丙烯纖維和鋰渣后,立方體抗壓強度提高了17.56%,軸心抗壓強度提高了20.06%,劈裂抗拉強度提高了53.26%,且凍融后質量損失率降低了36.79%,立方體強度損失率降低了34.78%,動彈性模量損失率降低了25.5%,經(jīng)加壓水滲透后平均滲水高度降低了22.28%。綜合考慮抗凍融性能中混凝土質量、強度、動彈性模量損失率整體趨勢及抗?jié)B性能中平均滲水高度,試驗中各因素按影響程度排序為聚丙烯纖維鋰渣沙漠砂。
[Abstract]:Desert sand concrete is a new type of environmental protection concrete. Desert sand is replaced by common medium sand in a certain proportion. The basic mechanical properties and durability of desert sand concrete are very close to those of normal concrete, but it is easy to shrink and crack. Problems such as poor impermeability are not widely used in order to improve the above properties of desert sand concrete. The above problems are solved by adding mineral admixture lithium slag and low elastic modulus fiber. Lithium slag is the industrial solid waste discharged on a large scale in the process of lithium salt production and processing. It can effectively improve the strength of concrete and improve the durability of concrete such as impermeability and frost resistance, while polypropylene fiber can greatly enhance the integrity of the internal structure of concrete. Xinjiang region reasonable development of desert sand for engineering construction, reduce engineering costs, contain desertification and dust storms, and make contributions to the ecological environment. From the long-term point of view of development, there are far-reaching economic and social benefits. In this paper, the desert sand in Tokeson County, Xinjiang, is replaced by concrete in proportion to ordinary medium sand. The sand concrete was modified by industrial waste lithium slag and polypropylene fiber. The basic mechanical properties and durability of lithium slag polypropylene fiber concrete with different desert sand replacement ratio were discussed. The basic mechanical properties and freezing resistance of Lithium slag polypropylene fiber concrete from desert sand are analyzed, such as cube compressive resistance, splitting tensile resistance, axial compression resistance, compressive stress-strain curve and so on. Impermeability. The experimental study shows that when the sand substitution ratio is 30%, the mechanical and durability of the specimen is the best. And through the mathematical expression of peak strain and axial compressive strength: 蔚 _ (CX) _ (80.02) 尾 _ (fc-3737.86) 脳 10 ~ (6), the influence coefficient of desert sand substitution rate is obtained. After polypropylene fiber and lithium slag, the cube compressive strength increased 17.56%, the axial compressive strength increased 20.06%, and the splitting tensile strength increased 53.26%. After freezing and thawing, the mass loss rate decreased by 36.79, the cube strength loss rate decreased by 34.78 and the dynamic elastic modulus loss rate decreased by 25.5%. The average percolation height is reduced by 22.28 after permeation of pressurized water. The concrete quality, strength, dynamic elastic modulus loss rate and average seepage height in the anti-freezing and thawing properties are considered comprehensively. According to the degree of influence, the factors in the test are polypropylene fiber lithium slag desert sand.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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