Study on Influence of Recycled Coarse Aggregate Replacement Rate on Creep of Recycled Thermal Insulation Concrete
[1]Huang Jiayu,Liu Yuanzhen,Gao Yuxuan,et al.Study on Influence of Recycled Coarse Aggregate Replacement Rate on Creep of Recycled Thermal Insulation Concrete[J].Journal of Zhengzhou University (Engineering Science),2021,42(5):68-73.[doi:10.13705/j.issn.1671-6833.2021.05.001]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42
Number of periods:
2021 Issue 5
Page number:
68-73
Column:
Public date:
2021-09-10
- Title:
- Study on Influence of Recycled Coarse Aggregate Replacement Rate on Creep of Recycled Thermal Insulation Concrete
- Keywords:
- recycled coarse aggregate replacement rate; elastic modulus; creep; creep coefficient; modified model
- CLC:
- -
- Abstract:
- Based on the creep test of recycled thermal insulation concrete under constant temperature and humidity, this research studies the different development of creep value, creep coefficient and elastic modulus of recycled thermal insulation concrete when the replacement rate of recycled coarse aggregate changes. Based on the ACI-FIP (1990) model, a new modified model is proposed to predict accurately the development state of creep coefficient of recycled thermal insulation concrete when the replacement rate of recycled coarse aggregate is different. Experiments showed that with the increase of the replacement rate of recycled coarse aggregate, the elastic modulus of recycled thermal insulation concrete decreased, and the creep value and creep coefficient increased significantly. Compared with thermal insulation concrete, the elastic modulus of recycled thermal insulation concrete with recycled coarse aggregate replacement ratios of 50% and 100% decreased by 10% and 12%, respectively. At 180 days, the creep of recycled thermal insulation concrete with recycled coarse aggregate replacement ratios of 50% and 100% increased by 6% and 17%, and the creep coefficient increased by 12% and 31%, respectively. Comparing the predicted results of the modified creep model with the test results, through linear regression analysis, it is found that the linear regression coefficients (R2) of recycled thermal insulation concrete models are all between 0.91 and 0.93, indicating the model has a good degree of fit and it can better predict the change of concrete creep coefficient with variation of recycled coarse aggregate replacement ratios.
- References:
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Last Update:
2021-10-11
