东南大学学报（自然科学版）Issue(2)：401-405,5.DOI:10.3969/j.issn.1001-0505.2014.02.031
冻融环境下黏土红砖的性能劣化规律与微结构演化
Performance deterioration and microstructure evolution of clay brick submitted to freeze-thaw cycles
摘要
Abstract
The changes of appearance,mass loss percentage and relative dynamic elastic modulus of clay brick submitted to freeze-thaw cycles were systematically studied.The mercury intrusion poro-simetry (MIP)was utilized to investigate the pore size distribution before and after freeze-thaw cy-cles.The X-ray computed tomography (CT)was also used to in situ quantitatively observe the evo-lution of the three-dimensional pore structure under freeze-thaw cycles.The results show that the frost damage is slight in the early stages.Macroscopic cracks appear on the surface after 35 freeze-thaw cycles and spalling occurs after 65 cycles.Mass is more sensitive when submitted to freeze-thaw cycles and shows a similar regulation as the relative dynamic elastic modulus with a first gradual increase,followed by a decrease.The pore structure analysis results show that the average pore size increases about 4 times after freeze-thaw cycles with coarse pores increasing by 23% in volume. Simultaneously,the number and the volume of pores with the volume of 0.01 to 0.1 mm3 increase evidently.The frost resistance of clay red brick is reduced consequently.关键词
黏土砖/冻融循环/性能劣化/微结构演化Key words
clay brick/freeze-thaw cycle/performance deterioration/microstructure evolution分类
建筑与水利引用本文复制引用
宦文娟,张云升,刘国建,赵鹏..冻融环境下黏土红砖的性能劣化规律与微结构演化[J].东南大学学报（自然科学版）,2014,(2):401-405,5.基金项目
国家自然科学基金重点资助项目（51138002）、“十二五”国家科技支撑计划资助项目（2012BAK14B05）． （）
