纳米SiO_(2)气凝胶水泥基复合材料中水的形态分布规律研究  

Study on moisture morphology distribution of nano-SiO_(2) aerogel cement based composites

作　　者：周暘 黄冬梅[1] 丰桢敏 杨建红 ZHOU Yang;HUANG Dongmei;FENG Zhenmin;YANG Jianhong(College of Energy Environment and Safety Engineering,China Jiliang University,Hangzhou 310018,China;Service Manufacturing Research Institute,Hangzhou 311199,China)

机构地区：[1]中国计量大学能源环境与安全工程学院,浙江杭州310018 [2]服务型制造研究院,浙江杭州311199

出　　处：《混凝土与水泥制品》2024年第11期12-16,共5页China Concrete and Cement Products

基　　金：国家自然科学基金面上项目(51976205)。

摘　　要：为了研究纳米SiO_(2)气凝胶对水泥基复合材料水分分布机制的影响,采用LF-NMR技术对室温环境下不同掺量(0、5%、7%、10%)纳米SiO_(2)气凝胶水泥基复合材料(AIC)吸水30 min后的T2信号进行了测试,在真空饱和的条件下,采用孔隙体积内饱水度描述AIC吸水前后含水量空间变化。结果表明:AIC0、AIC5、AIC7、AIC10试件的T2谱最高峰的峰面积所占比例分别为83.0%、78.7%、79.3%、79.6%,掺入纳米SiO_(2)气凝胶降低了最高峰的峰面积;当纳米SiO_(2)气凝胶掺量由0增至10%时,AIC试件的吸附水、毛细管水及孔隙水饱水度均减小;纳米SiO_(2)气凝胶能降低AIC的自由水存储性能。In order to investigate the effect of nano-SiO_(2) aerogel on the water distribution mechanism of cement based composites,the T2 signals of cement based composites with different nano-SiO_(2) aerogel contents(0、5%、7%、10%)after 30 min of water absorption at room temperature environment were tested by LF-NMR technique.The spatial variation of water content before and after water absorption of AIC specimens was described using the degree of water saturation in the pore volume under vacuum saturation conditions.The results show that the percentage of peak area of the highest peak of T2 spectra of AIC0,AIC5,AIC7,and AIC10 is 83.0%,78.7%,79.3%,and 79.6%,respectively,and adding nano-SiO_(2) aerogel reduces the peak area of the highest peak.When the content of nano-SiO_(2) aerogel increases from 0 to 10%,the adsorption water,capillary water,and pore water saturation of AIC specimens all decrease.Nano-SiO_(2) aerogel can reduce the free water storage performance of AIC.

关 键 词：纳米SiO_(2)气凝胶 水泥基复合材料 T2谱 水分分布 吸水 

分 类 号：TU528.2[建筑科学—建筑技术科学]