Evaluation of the Thermal and Shrinkage Stresses in Restrained High-Performance Concrete

Materials

Jintao Liu¹  Chunping Gu²  Jie Huang²  Yang Yang²  Linhao Ma²  Tongyuan Ni²  Zhenjian Xu³ 

[1] Hydro-electric Power Co., Ltd., Huzhou 313000, China;College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China;;Huzhou Southern Taihu Lake Design Institute of Water Conservancy &

关键词: high performance concrete;    restrained stress;    autogenous shrinkage;    drying shrinkage;    thermal stress;   

DOI  :  10.3390/ma12223680

来源: DOAJ

【 摘 要 】

The early age volume deformation is the main course for the cracking of high-performance concrete (HPC). Hence, the shrinkage behavior and the restrained stress development of HPC under different restraints and curing conditions were experimentally studied in this paper. The method to separate the stress components in the total restraint stress was proposed. The total restrained stress was separated into autogenous shrinkage stress, drying shrinkage stress and thermal stress. The results showed that the developments of the free shrinkage (autogenous shrinkage and drying shrinkage) and the restrained stress were accelerated when the drying began; but the age when the drying began did not significantly influence the long-term shrinkage and restrained stress of HPC; the autogenous shrinkage stress continuously contributed to the development of the total restrained stress in HPC; the drying shrinkage stress developed very rapidly soon after the drying began; and the thermal stress was generated when the temperature dropped. The thermal stress was predominant at the early age, but the contributions of the three stresses to the total restrained stress were almost the same at the age of 56 d in this study.

【 授权许可】

Unknown