The Research Of New To Old Concrete Interface Performance

With the old building gradually aging, The repair and strengthening of old building has become an important engineering domain. From 1970's, the engineering use large quantity concrete for building. Now, most of the buildinges needs to reinforcement and strengthening. But when we repair or reinforce the old building, we have to face to the frail zoo ?new to old concrete interfacial transition zone. The other side, in normal construction, the formerly cast concrete and later cast concrete also exsits interface problem, i.e. construction crack. The text commences from the problem, regarding experimenting as the means, proceeding the research to the new to old concrete interfacial transition zone. In experiment process, we researched two kinds of bonding-agent and use it to reinforce the new to old concrete structure.In experiment process, we adopted orthognal experiment. It reduced the experiment's quantity consumedly, while didn't influence the experiment comprehensive. In order to study bonding-agent's gluing result, at the same time, we make some experiments about two kinds of selling bonding-agents. and, we adopted some analyzing methods for the experimenting rusult, such as analysis of orthognal experiment, analysis of ductility, analysis of variance, for completely investigating the two kinds of bonding-agents' capacity, which we researched it. To inorganic material, after experi- menting and analyzing, we discovered the main factor was silicon ash, it affected interfacial bondage. Silicon ash's interfacial activity can improve property of ITZ (interfacial transition zone), and improve ITZ's bonding cappacity. Then in organism material, water in the bonding-agent is fatal. So, you can't mix water with organism material bonding-agent. But the constructional face allows have some water. To organism material bonding-agent, the measure of stagnate agent is very important. Only it must adopt a fit measures, you can get the best bonding result.Based on the experiments and analysis about the organism, inorganic material bonding-agents, we found that organism material bonding-agent can satisfy engineering, but inorganic material bonding-agents is badly to it. At the same time, based on the analysis the experiment's result, we discovered the factors that influenceing the two kinds of bonding--agents' property. This provide some consults to research bonding-agent in the future.