Microstructural damage characterization of concrete under freeze-thaw action

材料科学 微观结构 霜冻风化 复合材料 表征(材料科学) 多孔性 水泥 霜冻(温度) 地质学 纳米技术 土壤科学 土壤水分
作者
Qi Luo,Dongxu Liu,Pizhong Qiao,QG Feng,Lizhi Sun
出处
期刊:International Journal of Damage Mechanics [SAGE Publishing]
卷期号:27 (10): 1551-1568 被引量:65
标识
DOI:10.1177/1056789517736573
摘要

This paper conducts a quantitative analysis of microstructural damage evolution of concrete materials under freeze-thaw action using three-dimensional X-ray computed tomography. The study employs two resolution-scales to evaluate concrete samples under various cycles of freeze-thaw action. The three-dimensional microstructural damage characterization, pore network (porosity, pore size, and pore distribution) as well as the defects in the aggregates are specifically investigated. The microstructures of concrete under different freeze-thaw action show that the interfacial transition zone is most likely to be damaged first under frost attack. Furthermore, the freeze-thaw action deteriorates not only the interfacial transition zone but also cement matrix and aggregates. The impact of freeze-thaw cycles is notable on the internal micro-pores and micro-cracks of the concrete. More pores and cracks can be nucleated during the freeze-thaw action, and further accumulate and grow in the paste and aggregates, eventually leading to final failure of concrete materials. As demonstrated in this study, three-dimensional X-ray computed tomography is capable of acquiring microstructures of concrete and revealing existence of internal pores and cracks in different phases of concrete, and more effective to characterize accumulated damage of concrete due to freeze-thaw action.
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