再生骨料混凝土拉伸徐變影響因素試驗(yàn)研究
[Abstract]:At present, a series of environmental problems caused by waste concrete are becoming more and more prominent. Using waste concrete as recycled aggregate after processing becomes an important method to solve these problems, which can protect the environment and save resources. So as to promote the sustainable development of society has an important role. At present, there are few reports on tensile creep properties of recycled aggregate concrete. Due to the difference between recycled coarse aggregate and natural coarse aggregate, the tensile creep behavior of recycled aggregate concrete may be different from that of ordinary concrete. Therefore, in this paper, the influence of the replacement rate of recycled coarse aggregate and the replacement rate of fly ash and slag on tensile creep of recycled aggregate concrete is studied in order to deepen the understanding of the factors affecting the tensile creep of recycled aggregate concrete. Thus the application of recycled aggregate concrete is popularized. The main work of this paper is as follows: 1. The physical and mechanical properties of recycled coarse aggregate show that a large amount of old mortar attached on the surface leads to the characteristics of low density, large porosity, high water absorption and crushing index compared with natural coarse aggregate. 2. The effects of 70% recycled coarse aggregate replacement ratio and fly ash plus slag replacement ratio on the basic mechanical properties of recycled aggregate concrete were studied through the test of the basic mechanical properties of recycled aggregate concrete. The test results show that the recycled coarse aggregate can replace 70% natural coarse aggregate, which will lead to the decrease of the basic mechanical properties of recycled aggregate concrete in varying degrees. The basic mechanical properties of recycled aggregate concrete decrease with the increase of fly ash content. The addition of fly ash and slag can also reduce the basic mechanical properties of recycled aggregate concrete to different degrees, and the more the content of fly ash is, the lower the basic mechanical properties of recycled aggregate concrete are, but the decrease range is lower than that of fly ash group with the same amount of fly ash. Through uniaxial tensile creep test of recycled aggregate concrete, the effects of 70% recycled coarse aggregate replacement ratio and fly ash and slag co-substitution ratio on tensile creep properties of recycled aggregate concrete were studied. The experimental results show that the tensile creep of recycled aggregate concrete increases with the replacement of 70% natural coarse aggregate with recycled coarse aggregate, and the tensile creep increases with the increase of fly ash content, and the tensile creep of recycled aggregate concrete increases with the addition of fly ash. The addition of fly ash and slag can also increase the tensile creep of recycled aggregate concrete, and the tensile creep increases with the addition of fly ash, but the increase range is obviously lower than that of fly ash group with the same total content. 4. The results of tensile creep test of recycled aggregate concrete are compared with several kinds of creep prediction models at home and abroad. It is found that the commonly used creep prediction model is not suitable for the total tensile creep prediction of recycled aggregate concrete. The M-Burgers model can predict the basic creep of some test groups. The M-Burgers model is selected as the reference model, and based on the model, a basic creep prediction model suitable for recycled aggregate concrete is established by introducing appropriate parameters to consider the influence of coarse aggregate substitution ratio and mineral admixture.
【學(xué)位授予單位】:福州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TU528
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