表面状态对硬化水泥石显微硬度及统计分布的影响  

Influence of Surface Status of Hardened Cement Paste on Its Microhardness and Statistical Distribution

作　　者：蒋雁[1] 党玉栋[2,3] 钱觉时[4] 李昕成[2,3] 石鲜明[5] 杨正宏[1] 

机构地区：[1]同济大学,先进土木工程材料教育部重点实验室,上海201804 [2]云南省建筑科学研究院,昆明650223 [3]云南省建筑结构与新材料企业重点实验室,昆明650223 [4]重庆大学材料科学与工程学院,重庆400045 [5]华盛顿州立大学土木与环境工程系,美国普尔曼99164

出　　处：《硅酸盐学报》2017年第2期212-219,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51302191,51132010)

摘　　要：研究了硬化水泥石样品表面平整度和含水状态对其微观形貌、显微硬度及统计分布的影响。结果表明:硬化水泥石显微硬度数据呈明显的离散分布特征,提高样品表面平整度可在一定程度上降低显微硬度数据的离散性,但对硬化水泥石进行有限次的显微硬度测试时,不论抛光与否,数据均不符合正态分布,而更加符合3因数对数正态分布。采用3因数对数正态分布对相同原材料、配比、养护和制样方法制备的硬化水泥石显微硬度进行统计分析后发现,饱和面干硬化水泥石的显微硬度明显低于干燥状态的样品。因此,当测试水泥基材料的显微硬度时,必须要保持待测样品表面具有相同的平整度和水饱和程度,并应采用统计方法对数据进行比较和分析。Influences of smoothness and saturation level of hardened cement paste （HCP） on its microscopic morphologies, microhardness and statistic distribution were investigated. The results indicate that the measured microhardness values are subject to considerable variability, and the improvement of the sample smoothness can slightly lead to the less variability of microhardness values. However, for limited microhardness measurements, the microhardness data are not normally-distributed, but fit best with a 3-parameter lognormal model. For the same HCP samples with different water saturation levels, it is clear that the microhardness of saturated surface-dried （SSD） samples is lower than that of oven-dried samples after quantitatively comparing the statistical parameters to the best goodness-of-fit of 3-parameter lognormal distribution. It is essential to keep the sample with the same surface condition, and it is necessary to statistically analyze the microhardness of cement based materials.

关 键 词：硬化水泥石 显微硬度 制样方法 抛光 饱和程度 统计分布 

分 类 号：TU528[建筑科学—建筑技术科学]