自密實(shí)鋼纖維全輕混凝土的收縮性能試驗(yàn)研究
[Abstract]:Self-compacting steel fiber all-light concrete is a kind of new composite material formed by adding a certain amount of disordered steel fiber to the self-compacting total light concrete. In this paper, the early age crack resistance, autogenous shrinkage and drying shrinkage of self-compacting steel fiber all-light concrete are discussed, and the influencing factors are also discussed. The early age crack resistance, autogenous shrinkage and drying shrinkage of the self-compacting steel fiber whole light concrete were analyzed by experiment. The concrete strength grade C40 is selected on the basis of the existing tests in our research group. The test parameters are steel fiber content and maximum particle size of coarse aggregate. The volume ratio of steel fiber in the range of 0% and 1.6% is 0.8% and 1.2% and 1.6% respectively. The effects of different content of steel fiber on crack resistance and crack state of self-compacting steel fiber whole light concrete at early age and on autogenous shrinkage and dry shrinkage are studied. The maximum diameter of coarse aggregate is 10mm / 16mm and 20mm respectively, and the effects of maximum diameter of coarse aggregate on the early age crack resistance, autogenous shrinkage and dry shrinkage of self-compacting steel fiber whole light concrete are studied by experiments. The results show that, in the early age crack resistance test, the crack development rate of the self-compacting steel fiber fully light concrete in the first 1.5 days is faster than that in the first 1.5 days, and the development speed tends to be gentle after 1.5 days. When the maximum diameter of coarse aggregate is 16mm and the content of steel fiber is 1.2, the nominal crack area and crack depth of concrete at early age reach the minimum. Crack resistance grade is also higher than the coarse aggregate maximum particle size of 10mm and 20mm concrete. With the increase of steel fiber content, the self-shrinkage value decreases gradually. When the maximum diameter of aggregate is 10 mm and the content of steel fiber is 1.2 mm, the value of autogenous shrinkage is the smallest. When the content of steel fiber is in the range of 0% to 1.2%, the drying shrinkage decreases with the increase of the content of steel fiber, but the shrinkage value does not decrease obviously when the content of steel fiber increases to 1.6%. When the maximum particle size of aggregate is 16mm, the drying shrinkage value reaches the minimum. Finally, the experimental data are analyzed synthetically, and the experimental data are fitted. The correlation coefficient R is greater than 0.9, and the fitting degree is better. The fitting curve with good fitting degree is obtained by comparing the fitting value with the measured value.
【學(xué)位授予單位】:華北水利水電大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU528
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