Study on estimation of creep behaviour of concrete at early age considering temperature effect

¹ Student of master course, Department of Civil and Environmental Engineering, Hosei University Graduate School, Japan
² Student of doctoral course, Department of Civil and Environmental Engineering, Hosei University Graduate School, Japan
³ Professor, Department of Civil and Environmental Engineering, Hosei University, Japan

^* Corresponding author: kayo.ohashi.7f@stu.hosei.ac.jp

Abstract

Clarifying the creep behaviour of concrete at early age not only improves the accuracy of temperature stress analysis but also contributes to prediction accuracy and control measures in cracks caused by thermal stress. However, most past researches on creep behaviour were investigated after 28 days. Currently, it is difficult to accurately perceive the creep behaviour of concrete at an early age in the test method of creep which is generally carried out. Therefore, it is necessary to evaluate the creep behaviour of concrete at early age and to establish a convenient test method to estimate the creep behaviour. Therefore, in this study, experiments were carried out for concrete at early age within one week. As the result of the experiments, it was shown that the creep strain is proportional to the load stress of concrete at an early age and the strain of specific creep decreases as the loaded age increases. In addition, based on the experimental results, an estimation equation for creep strain at early age was proposed. Within the scope of this experimental result, it was confirmed that the estimation equation proposed in this study accurately represented the creep behaviour of concrete at early age.