西南交通大学学报2024，Vol.59Issue(5)：1123-1131,9.DOI:10.3969/j.issn.0258-2724.20220179
浇筑期温度对泡沫混凝土性能和微孔结构的影响
Influence of Temperature on Performance and Microporous Structure of Foamed Concrete During Pouring Period
摘要
Abstract
Foamed concrete is susceptible to environmental factors such as temperature during the period from pouring to curing and molding,and adverse environmental factors can lead to performance degradation and deterioration of foamed concrete after curing and molding.In order to study the performance and microporous structure of foamed concrete affected by temperature(-15-70℃)during the pouring period,a single factor indoor test program was designed by using dry density,compressive strength,and water absorption to evaluate the physical property of foamed concrete,the construction quality,and the operational durability of foamed concrete,respectively.In addition,the evolution of the microporous structure of foamed concrete was analyzed by using an image data acquisition system and Image J software.The results show that the dry density of foamed concrete generally decreases in a stepwise manner as the temperature rises.The compressive strength first decreases,then increases,and finally decreases.The water absorption rate takes 0 as the cut-off point,and it tends to increase and then decrease when the temper℃ature decreases or increases.The equivalent pore size shows a trend of increasing,decreasing,and increasing.The pore roundness value first increases and then decreases.The fractal dimension of pore distribution first decreases and then becomes larger.The results of macroscopic performance and microporous structure show that the recommended temperature range for the construction of foamed concrete during the pouring period is-5-40℃.关键词
泡沫混凝土/浇筑期/温度/宏观性能/微孔结构Key words
foamed concrete/pouring period/temperature/macroscopic performance/microporous structure分类
土木建筑引用本文复制引用
刘鑫,姚云龙,张思卿,史云强,洪宝宁..浇筑期温度对泡沫混凝土性能和微孔结构的影响[J].西南交通大学学报,2024,59(5):1123-1131,9.基金项目
国家自然科学基金项目(51609071) （51609071）
