Influence of Temperature on Performance and Microporous Structure of Foamed Concrete During Pouring Period
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℃.
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