發(fā)布時間：2018-04-09 13:29

  本文選題：橡膠集料　切入點：高強混凝土　出處：《遼寧工程技術(shù)大學》2015年碩士論文

【摘要】：橡膠集料高強混凝土是一種新型綠色環(huán)保建筑材料。在高強混凝土的基礎上,摻入橡膠集料(等體積取代細集料砂子),改善高強混凝土高溫爆破的缺陷,提高高強混凝土的高溫性能。目前國內(nèi)外主要研究的是摻橡膠集料(粉)的普通混凝土常溫下的性能,對摻橡膠集料(粉)的高強混凝土高溫下的性能研究鮮有報道。因此,從建筑減災的角度出發(fā),研究橡膠集料對高強混凝土高溫前后性能的影響,不僅具有明確的工程應用前景,對混凝土技術(shù)的發(fā)展也有理論價值。論文引用細度模數(shù)作為橡膠集料粗細程度的評價指標,對橡膠集料高強混凝土高溫前后性能進行了大量試驗研究,包括混凝土拌合物稠度試驗；高溫前后混凝土表觀密度試驗；高溫前后混凝土抗壓強度及劈拉強度試驗等。研究表明：①低摻適量的橡膠集料可以提高高強混凝土高溫性能。用掃描電鏡對橡膠硬化水泥漿體進行了高溫前后的表征分析,從微觀角度解釋混凝土宏觀力學性能變化。②通過三因素、四水平的正交試驗,研究橡膠集料摻量、細度以及高強混凝土煅燒溫度對高強混凝土性能的影響。發(fā)現(xiàn)摻“1.7%”特細橡膠集料可抑制高強混凝土高溫爆裂,提高高強混凝土的殘余強度,但其影響程度遠不如煅燒溫度的影響。初步建立了橡膠集料高強混凝土高溫前后強度剩余百分率與橡膠集料摻量、細度和煅燒溫度之間的回歸方程,對工程應用有一定指導作用。③通過采用單因素對比試驗,研究不同溫度下(常溫、200℃、400℃、600℃和800℃)C60高強混凝土和摻“1.7%”特細橡膠集料C60高強混凝土的耐久性能。結(jié)果表明,在常溫和600℃煅燒溫度后,摻“1.7%”特細橡膠集料的高強混凝土的耐久性能要好于未摻橡膠集料的高強混凝土的耐久性能,適量的橡膠細集料對高強混凝土常溫下和600℃煅燒溫度后的耐久性有提高作用。
[Abstract]:Rubber aggregate high strength concrete is a new kind of green environmental protection building material.On the basis of high strength concrete, rubber aggregate (equal volume instead of fine aggregate sand) is added to improve the defects of high strength concrete in high temperature blasting and to improve the high temperature performance of high strength concrete.At present, the main research at home and abroad is the performance of ordinary concrete mixed with rubber aggregate (powder) at room temperature, and there are few reports on the performance of high strength concrete mixed with rubber aggregate (powder) at high temperature.Therefore, from the point of view of building disaster reduction, studying the influence of rubber aggregate on the performance of high strength concrete before and after high temperature not only has a clear engineering application prospect, but also has theoretical value for the development of concrete technology.In this paper, the fineness modulus is used as the evaluation index of rubber aggregate thickness, and a large number of tests are carried out on the properties of rubber aggregate high strength concrete before and after high temperature, including the consistency test of concrete mixture, the apparent density test of concrete before and after high temperature, and the test of concrete apparent density before and after high temperature.Test of compressive strength and splitting tensile strength of concrete before and after high temperature.The results show that the high temperature properties of high strength concrete can be improved by low content of rubber aggregate.The rubber hardened cement paste was characterized before and after high temperature by scanning electron microscope (SEM). The change of macroscopic mechanical properties of concrete was explained from the microscopic point of view. 2. The content of rubber aggregate was studied by orthogonal test of three factors and four levels.Effects of fineness and calcination temperature of high strength concrete on properties of high strength concrete.It is found that the addition of "1.7%" ultra-fine rubber aggregate can restrain the high strength concrete cracking at high temperature and increase the residual strength of high strength concrete, but its influence degree is far less than that of calcination temperature.The regression equation between the residual percentage of strength of rubber aggregate high strength concrete before and after high temperature and the content, fineness and calcining temperature of rubber aggregate is established.The durability of C60 high strength concrete at different temperatures (200 鈩，

本文編號：1726626