- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Fuhai, TANG Huiqi, LI Jiyun, LIU Menghui, WANG Jiangshan, CHEN Shuang, XU Tengfei. Concrete Elastic Modulus and Creep Control Based on Dense Packing Theory[J]. Journal of Southwest Jiaotong University, 2024, 59(2): 404-412. doi: 10.3969/j.issn.0258-2724.20210431
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In order to reduce the deflection amplitude of the continuous rigid frame bridge span, an optimized control method of mix proportion based on the dense packing theory of aggregates was proposed for the two influencing factors of elastic modulus and creep. In addition, the original mix proportion was studied to analyze the influence of the optimized control method on the elastic modulus and creep under different ages and environments. At the same time, the optimization mechanism was analyzed from the microscopic level of concrete in combination with scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) experiments. Based on the CEB-FIP (1990) model, a modified model considering the maturity of elastic modulus was proposed. The results show that the optimized control method can effectively control the elastic modulus of concrete at an early age, but the increase in the area of the interface transition zone limits the later development of the elastic modulus. Under the same conditions, the creep coefficient of the optimized concrete is reduced by 12%–23% compared with the original mix proportion. Moreover, the influence of the environment on the concrete creep is dominant compared with the optimized control method. The variation range of concrete creep under different environments is between 45% and 60%. Concrete creep decreases with the loading age, and the creep of optimized concrete at a small loading age is still 3%–13% lower than the original mix proportion of the concrete at a large loading age. After optimization, the number of internal pores and micro-cracks in the concrete at an early age is reduced. Therefore, the internal structure of the concrete is improved. The modified CEB-FIP (1990) model has higher accuracy in predicting creep.
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