本文選題：鋼纖維混凝土　切入點(diǎn)：界面粘結(jié)　出處：《重慶交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：本文通過不同摻量的聚合物、硅灰加入到鋼纖維混凝土中作為新澆筑混凝土,研究新舊混凝土的界面粘結(jié)性能和斷裂性能,同時(shí)研究不同界面處理工藝對(duì)新舊混凝土界面粘結(jié)性能的影響,和不同脫粘面積對(duì)新舊混凝土粘結(jié)后斷裂性能的影響,并且對(duì)斷裂試驗(yàn)進(jìn)行了有限元模擬。本次研究主要進(jìn)行了以下試驗(yàn)分析:(1)混凝土抗壓、抗折試驗(yàn),研究不同摻量的聚合物、硅灰對(duì)鋼纖維混凝土的影響;(2)混凝土鉆芯拉拔試驗(yàn),測(cè)得新舊混凝土界面粘結(jié)強(qiáng)度,研究不同摻量的聚合物、硅灰以及不同界面處理工藝對(duì)鋼纖維混凝土與舊混凝土界面粘結(jié)強(qiáng)度的影響;(3)混凝土三點(diǎn)彎曲梁試驗(yàn),研究不同摻量的聚合物、硅灰以及不同脫粘面積對(duì)新舊混凝土粘結(jié)斷裂性能的影響;(4)運(yùn)用有限元軟件ABAQUS對(duì)三點(diǎn)彎曲梁試驗(yàn)進(jìn)行數(shù)值模擬分析,比較不同脫粘面積的下新舊混凝土的斷裂性能。通過上述試驗(yàn),可以得到以下結(jié)論:(1)硅灰對(duì)混凝土的基本力學(xué)性能都有明顯的提高作用,并且在本次試驗(yàn)所用摻量中9%為最佳,聚合物的加入,并不能明顯提高混凝土的力學(xué)性能,但能增加其柔性;(2)聚合物摻入普通混凝土中時(shí),能明顯提高其界面粘結(jié)性能,但對(duì)于鋼纖維混凝土而言,影響不明顯;硅灰對(duì)普通混凝土和鋼纖維混凝土,均能提高其界面粘結(jié)強(qiáng)度;同時(shí)在涂抹界面劑時(shí)其粘結(jié)強(qiáng)度最大,切槽次之,未做處理最小。(3)聚合物對(duì)混凝土斷裂過程中的峰值荷載和斷裂韌度并沒有明顯的提高作用,硅灰能夠有效的提高斷裂過程中的峰值荷載和斷裂韌度;不同的脫粘面積時(shí),脫粘面積越大,試件的峰值荷載越小,對(duì)應(yīng)的位移越大,其斷裂韌度不斷減小;(4)有限元分析結(jié)果與試驗(yàn)結(jié)果顯示出的趨勢(shì)基本一致,但由于數(shù)值分析所用參數(shù)一部分來自試驗(yàn),一部分來自理論計(jì)算,使得數(shù)值分析的結(jié)果與實(shí)際也存在一定的差異。
[Abstract]:In this paper, the interfacial bond and fracture properties of new and old concrete are studied by adding silica fume into steel fiber reinforced concrete with different amount of polymer. At the same time, the effects of different interfacial treatment processes on the bond properties of new and old concrete and the effect of different debonding areas on the fracture properties of new and old concrete are studied. And the fracture test was simulated by finite element method. In this study, the following tests were carried out to analyze the compressive and flexural strength of concrete, and to study the influence of different amount of polymer and silica fume on steel fiber reinforced concrete (SFRC) core drawing test. The interfacial bond strength of new and old concrete was measured. The effect of different amount of polymer, silica fume and interfacial treatment technology on bond strength between steel fiber concrete and old concrete was studied. The effects of different amount of polymer, silica fume and different debonding area on bond fracture properties of new and old concrete are studied. Numerical simulation analysis of three-point bending beam test is carried out by using finite element software ABAQUS. By comparing the fracture properties of new and old concrete with different debonding areas, the following conclusions can be drawn from the above tests: (1) silica fume can obviously improve the basic mechanical properties of concrete, and 9% is the best one in this experiment. The addition of polymer can not obviously improve the mechanical properties of concrete, but it can increase the flexibility of concrete. When the polymer is added into ordinary concrete, it can obviously improve the interfacial bond property, but for steel fiber reinforced concrete, the influence is not obvious. Silica fume can improve the interfacial bond strength of both ordinary concrete and steel fiber concrete. Without treatment, the maximum load and fracture toughness of concrete during fracture were not significantly increased by the polymer, but the peak load and fracture toughness were increased effectively by silica fume, and different debonding areas were obtained. The larger the debonding area is, the smaller the peak load is and the larger the displacement is. The fracture toughness of the specimen decreases continuously. (4) the results of finite element analysis are basically consistent with the experimental results. However, some of the parameters used in the numerical analysis come from the test. Some of them come from theoretical calculation, which makes the results of numerical analysis different from the actual ones.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU528

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本文編號(hào)：1577147