摘要
采用精密切片及划片技术,制备边长分别为100μm和200μm的硬化水泥净浆微观立方体试件。采用纳米压痕仪,利用不同几何形状的压头,对制备的试件进行无侧限轴压及单边劈裂测试,在微观尺度上研究硬化水泥净浆的抗压和劈裂强度。为了表征硬化水泥净浆微观尺度的变异性,每组工况测试100个样品,建立数据库,进行统计分析。结果表明:硬化水泥净浆的微观强度概率分布可以用二参数Weibull分布函数进行表征;高水胶比的硬化水泥净浆的平均强度较低且变异性高;试件尺寸对测试结果具有显著影响,强度和变异性均随试件尺寸增大而降低。与已有研究结果对比,发现硬化水泥净浆的微观强度和离散性介于单一水化产物和混凝土之间。
Micro-cubes of hardened cement paste with the lengths of 100μm and 200μm were prepared by micro-dicing and thin-sectioning techniques.The compressive strength and splitting strength of these specimens were measured by a nanoindenter equipped with different types of tips.Considering the heterogeneity nature of the material in a micro-scale,we examined 100 specimens via a statistic analysis.The results show that the two-parameter Weibull distribution can be used to represent the probability distribution of both compressive strength and splitting strength in a micro-scale.The specimens with a higher water-to-binder ratio have a higher strength and a lower variability.Furthermore,the specimen size has an influence on the measured strength.The bigger specimens have lower strength and variability.The reported average value and variability of strengths obtained in this work are greater than those of the concrete in a meso-scale,but lower than those of the hydration product in a nano-scale.
作者
葛智
姜能栋
张洪智
侯东帅
Erik Schlangen
Branko Šavija
GE Zhi;JIANG Nengdong;ZHANG Hongzhi;HOU Dongshuai;SCHLANGEN Erik;ŠAVIJA Branko(School of Qilu Transportation,Shandong University,Ji’nan 250100,China;Suzhou Research Institute,Shandong University,Suzhou 215021,Jiangsu,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;Faculty of Civil Engineering and Geosciences,Delft University of Technology,2628 CN,Delft,the Netherlands)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第5期887-892,共6页
Journal of The Chinese Ceramic Society
基金
山东省泰山学者青年计划(tsqn201909032)
国家自然科学基金项目(52008234,51478252,51978387)
江苏省自然科学基金项目(BK20200235)。
