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Structural Engineering and Mechanics
  Volume 66, Number 2, April25 2018, pages 263-271
DOI: http://dx.doi.org/10.12989/sem.2018.66.2.263
 


Long-term development of compressive strength and elastic modulus of concrete
Shuzhen Yang, Baodong Liu, Mingzhe Yang and Yuzhong Li

 
Abstract
    Compressive strength and elastic modulus of concrete are constantly changing with age. In order to determine long-term development of compressive strength and elastic modulus of concrete, an investigation of C30 concrete cured in air conditions was carried out. Changes of compressive strength and elastic modulus up to 975 days were given. The results indicated that compressive strength and elastic modulus of concrete rapidly increased with age during the initial 150 days and then increased slowly. The gain in elastic modulus was slower than that of compressive strength. Then relationships of time-compressive strength, time-elastic modulus and compressive strength-elastic modulus were proposed by regression analysis and compared with other investigations. The trends of time-compressive strength and time-elastic modulus with age agreed best with ACI 209R-92. Finally, factors contributed to long-term development of compressive strength and elastic modulus of concrete were proposed and briefly analyzed.
 
Key Words
    long-term properties; compressive strength; elastic modulus; influence factors
 
Address
Shuzhen Yang and Baodong Liu: Department of Bridge Engineering, Beijing Jiaotong University, No. 3 Shangyuancun, Haidian District, Beijing, China
Mingzhe Yang: China Chengda Engineering Co., Ltd., No. 279, Middle Section, Tianfu Avenue, Chengdu, Sichuan Province, China
Yuzhong Li: Hebei University of Architecture, No. 13, Chaoyang Avenue(West), Qiaodong District, Zhangjiakou City, Hebei Province, China
 

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