风速对浇筑期轻质泡沫混凝土性能的影响

为了探究风速在浇筑期对轻质泡沫混凝土（lightweight cellular concrete，LCC）性能的影响规律，设计模拟风速的室内试验研究了LCC宏观性能和微观结构的演变规律，并揭示了微孔结构参数与宏观性能参数之间的相互关系。结果表明：当风速在4级风以下和持续时间在6 h以内，LCC干密度和抗压强度均与风速呈正相关，吸水率与风速呈负相关；等效孔径和平均孔圆周度与风速呈负相关，孔径分布符合对数正态分布，气孔逐渐趋于有利于受力特性的圆形；风速对孔隙分布分维影响不大，但总体趋势也是与孔分布分维呈负相关。可见，在4级风以下和持续时间较短（6 h以内）时，风速增长、时间延长总体上对LCC各项性能起优化作用。

Effect of wind speed on performance of lightweight cellular concrete during pouring phase

In order to investigate the effect of wind speed on the performance of lightweight cellular concrete (LCC) during the pouring phase, indoor tests simulating wind speed were designed to investigate the evolution of macroscopic properties and microstructure of LCC, and to reveal the correlation between microporous structure parameters and macroscopic performance parameters. The results show that the dry density and compressive strength of LCC are positively correlated with wind speed and the water absorption is negatively correlated with wind speed when the wind speed is below 6 m/s and the duration is within 6 h. The average pore size and the average pore roundness value are negatively correlated with wind speed, and the pore size distribution conforms to the log-normal distribution, and the pores gradually tend to be circular with favorable force characteristics. Wind speed has little effect on fractal dimension of pore distribution, but the overall trend is also negatively correlated with the fractal dimension of pore distribution. It can be seen that the increase of wind speed and the increase of time generally optimize the performance of LCC when the wind level is below 6 m/s and the duration is short (within 6h).