【摘要】：本文作者首先通過采用不同配合比的鋼纖維聚合物混凝土作為修補材料，研究新舊混凝土粘結(jié)面在是否涂抹界面劑、新舊混凝土粘結(jié)成型后的養(yǎng)護齡期的不同對新舊混凝土界面粘結(jié)拉拔性能以及界面剪切性能的影響。確定了使新舊混凝土粘結(jié)界面粘結(jié)性能達(dá)到最佳的鋼纖維聚合物混凝土的配合比，，同時研究結(jié)果表明涂刷聚合物水泥凈漿界面劑大大提高了新舊混凝土界面的粘結(jié)性能。 通過鋼纖維聚合物混凝土與老基準(zhǔn)板梁的三點彎曲梁實驗，在不同配合比的鋼纖維聚合物混凝土作為修補材料和普通混凝土作為修補材料的對比的情況下研究了新舊混凝土粘結(jié)面的斷裂性能。同時在新舊混凝土發(fā)生斷裂破壞后繼續(xù)施加壓力的情況下研究了新舊混凝土粘結(jié)后的抗折性能。通過實驗研究得出鋼纖維聚合物混凝土作為修補材料后斷裂性能和抗折性能要遠(yuǎn)遠(yuǎn)強于普通混凝土，同時確立了鋼纖維聚合物混凝土與舊混凝土界面斷裂韌度達(dá)到最大時鋼纖維聚合物混凝土的配合比。 在微觀結(jié)構(gòu)方面：1、通過壓汞實驗研究鋼纖維聚合物混凝土的孔結(jié)構(gòu)特征參數(shù)2、通過鋼纖維聚合物混凝土的吸水率實驗研究了鋼纖維聚合物乳液的摻入對混凝土的密實度和孔隙率的影響。通過上述實驗研究來分析鋼纖維聚合物混凝土微觀結(jié)構(gòu)與新舊混凝土粘結(jié)面的粘結(jié)性能的關(guān)系。
[Abstract]:In this paper, the author first used steel fiber reinforced polymer concrete (SFRC) with different mix ratios as repair materials to study whether the bonding surface of the new and old concrete is coated with interface agent or not. The influence of the curing age of the new-old concrete on the interfacial bond-pull performance and the interfacial shear performance of the new-old concrete. The blending ratio of steel fiber reinforced polymer concrete (SFRC) which can make the bonding properties of new and old concrete bond interface is determined. The results show that the bonding performance of the new and old concrete interface is greatly improved by brushing the polymer cement paste interface agent. Through the three-point bending experiment of steel fiber reinforced polymer concrete (SFRC) and old reference plate beam, The fracture behavior of new and old concrete interface was studied by comparing the steel fiber reinforced polymer concrete (SFRC) with different mix ratios as repair materials and ordinary concrete as repair materials. At the same time, the flexural behavior of the new-old concrete after bond is studied under the condition that the new-old concrete is subjected to continuous pressure after the fracture failure of the new-old concrete. The experimental results show that the fracture and flexural properties of steel fiber reinforced polymer concrete (SFRC) are much stronger than that of ordinary concrete after being used as repair material. At the same time, the ratio of steel fiber reinforced polymer concrete (SFRC) to steel fiber reinforced polymer concrete (SFRC) is established when the interface fracture toughness of SFRC and old concrete reaches the maximum. In terms of microstructure: 1, the pore structure characteristic parameters of steel fiber reinforced polymer concrete (SFRC) are studied by mercury compression experiment. The influence of steel fiber polymer emulsion on the compactness and porosity of concrete was studied by water absorption experiment of steel fiber polymer concrete. The relationship between the microstructure of steel fiber reinforced polymer concrete (SFRC) and the bond properties of the new and old concrete interface is analyzed by the above experimental study.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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