Laws of changing of microstructure and development of micro-cracks in concrete are revealed at macroscopical level by determination of longitudinal residual strains and calculation of specific crack area. Two opposite mechanisms of consolidation and cracking to the microstructure changing of concrete under axial compressive load are also revealed. Results show that the development of micro-cracks inside the concrete is consistent with the development of deformation. The residual strain and residual specific crack area are larger when the load level is higher after unloaded. There is obvious difference between the development process of micro-crack in concrete with different mix proportion. To the concrete with higher water to binder ratio and lower strength, the intial stress for micro cracks begining to expand and the critical stress of unstable crack propagation are both lower. The influence of uniaxial compressive load on the durability of concrete depends on the relative relations between these two opposite mechanisms. © 2011 Published by Elsevier Ltd.
Jiang, F. X., Wang, Y., Zhao, T., Tan, M., & Meng, L. (2012). Evaluation on micro-cracks development and damage of concrete under axial compressive load. In Procedia Engineering (Vol. 27, pp. 1553–1559). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2011.12.620