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国家自然科学基金(51178105)

作品数:2 被引量:7H指数:2
相关作者:胡传林高岳毅张亚梅李宗津更多>>
相关机构:江苏省安全生产科学研究院东南大学香港科技大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:建筑科学更多>>

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用纳米压痕复合扫描电子显微镜分析水泥砂浆中单一组相的力学性能(英文)被引量:5
2012年
采用纳米压痕复合扫描电子显微镜研究了硬化水泥砂浆的物相和对应的微观力学性能。结果发现:微观尺度上,砂子、未水化水泥颗粒和氢氧化钙的弹性模量分别为105.55、107.06 GPa和60.88 GPa。同时,低密度水化产物和高密度水化产物的存在得到了验证,其弹性模量的统计分析值分别为18.42GPa和32.53GPa。从测试结果的对比分析可以看出,未水化水泥颗粒弹性模量的测试值与文献值基本保持一致,氢氧化钙弹性模量的测试值高于文献值;水化产物弹性模量统计分析的结果虽与文献保持一致,但超高密度水化产物的存在仍有不确定性。
高岳毅张亚梅胡传林李宗津
关键词:纳米力学性能弹性模量纳米压痕
Quantitative Characterization and Elastic Properties of Interfacial Transition Zone around Coarse Aggregate in Concrete被引量:2
2017年
Backscattered electron images(BSE) obtained by scanning electron microscope was used to quantitatively characterize the microstructure of interfacial transition zone(ITZ) in concrete. Influences of aggregate size(5, 10, 20, and 30 mm), water to cement ratio(0.23, 0.35 and 0.53) and curing time(from 3d to 90d) on the microstructure of interfacial transition zone between coarse aggregate and bulk cement matrix were investigated. The volume percentage of detectable porosity and unhydrated cement in ITZ was quantitatively analyzed and compared with that in the matrix of various concretes. Nanoindentation technology was applied to obtain the elastic properties of ITZ and matrix, and the elastic modulus of concrete was then calculated based on the Lu & Torquato model and self-consistence scheme by using the ITZ thickness and elastic modulus obtained from this investigation. The experimental results demonstrated that the microstructure and thickness of ITZ in concrete vary with a variety of factors, like aggregate size, water to cement ratio and curing time. The relative low elastic properties of ITZ should be paid attention to, especially for early age concrete.
贾子健HAN Yunge张亚梅QIU ChenHU ChuanlinLI Zongjin
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