钢纤维聚合物混凝土与旧混凝土界面粘结性能研究
发布时间：2019-03-11 07:44
【摘要】：本文作者首先通过采用不同配合比的钢纤维聚合物混凝土作为修补材料，研究新旧混凝土粘结面在是否涂抹界面剂、新旧混凝土粘结成型后的养护龄期的不同对新旧混凝土界面粘结拉拔性能以及界面剪切性能的影响。确定了使新旧混凝土粘结界面粘结性能达到最佳的钢纤维聚合物混凝土的配合比，，同时研究结果表明涂刷聚合物水泥净浆界面剂大大提高了新旧混凝土界面的粘结性能。 通过钢纤维聚合物混凝土与老基准板梁的三点弯曲梁实验，在不同配合比的钢纤维聚合物混凝土作为修补材料和普通混凝土作为修补材料的对比的情况下研究了新旧混凝土粘结面的断裂性能。同时在新旧混凝土发生断裂破坏后继续施加压力的情况下研究了新旧混凝土粘结后的抗折性能。通过实验研究得出钢纤维聚合物混凝土作为修补材料后断裂性能和抗折性能要远远强于普通混凝土，同时确立了钢纤维聚合物混凝土与旧混凝土界面断裂韧度达到最大时钢纤维聚合物混凝土的配合比。 在微观结构方面：1、通过压汞实验研究钢纤维聚合物混凝土的孔结构特征参数2、通过钢纤维聚合物混凝土的吸水率实验研究了钢纤维聚合物乳液的掺入对混凝土的密实度和孔隙率的影响。通过上述实验研究来分析钢纤维聚合物混凝土微观结构与新旧混凝土粘结面的粘结性能的关系。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
本文编号：2438092
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
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本文编号：2438092
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