掺偏高岭土对蒸养混凝土性能的影响研究
PDF下载 (18783)沈黄冰 1,贺智敏 1*,何建明 2.掺偏高岭土对蒸养混凝土性能的影响研究[J].宁波大学学报(理工版),2018,31(4):74-80.DOI:
SHEN Huang-bing 1,HE Zhi-min 1*,HE Jian-ming 2.Effect of metakaolin on the performance of steam cured concrete[J].Journal of Ningbo University(Natural Science & Engineering Edition),2018,31(4):74-80.DOI:
| Title: | Effect of metakaolin on the performance of steam cured concrete |
| 作者: | 沈黄冰 1, 贺智敏 1*, 何建明 2 |
| Author(s): | SHEN Huang-bing 1, HE Zhi-min 1*, HE Jian-ming 2 |
| 关键词: | 蒸汽养护; 偏高岭土; 氯离子; 硫酸盐; 显微硬度; 水化 |
| Keywords: | steam curing; metakaolin; chloride; sulfate; micro hardness; hydration |
| 分类号: | TU52 |
| 文献标识码: | A |
| 摘要: | 为改善蒸养混凝土性能, 研究了掺偏高岭土对蒸养混凝土抗压强度、抗氯离子渗透和抗硫酸盐侵蚀性能的影响, 并通过热分析和界面区显微硬度测试, 探讨了偏高岭土对蒸养混凝土的作用机理. 结果表明, 掺偏高岭土显著提高了蒸养混凝土脱模强度和抗氯离子渗透性, 掺量15%时效果最佳; 掺偏高岭土大幅提高了蒸养混凝土的抗硫酸盐侵蚀性能, 其抗折抗蚀系数远高于空白混凝土; 偏高岭土对蒸养混凝土性能的改善机理与其水化时消耗大量Ca(OH)2, 从而提高了界面区显微硬度有关. |
| Abstract: | In order to improve the performance of steam curing concrete, the effect of metakaolin (MK) on steam cured concrete compressive strength, resistance to chloride ion permeability and sulfate corrosion were investigated. Through thermal analysis and interface microhardness test, the mechanism of MK on steam cured concrete was also discussed. Results show that MK can significantly improve the steam cured concrete demoulding strength and resistance to chloride ion permeability, and the optimal incorporating amount of MK is 15 percent. MK enhances the sulfate resistance of steam cured concrete, and its flexural resistance coefficient is much higher than that of the blank concrete. The improvement mechanism of MK on the performance of steam cured concrete is related to its consumption of a large amount of Ca(OH)2, which increases the interface area micro hardness and strengthen the interface. |
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| 备注/Memo: | 收稿日期: 2017－09－29. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/基金项目: 浙江省自然科学基金（LY17E080007）; 宁波市自然科学基金（2015A610300）; 宁波大学胡岚优秀博士基金（ZX2014000168）.第一作者: 沈黄冰（1991－）, 男, 浙江绍兴人, 在读硕士研究生, 主要研究方向: 混凝土材料. E-mail: shenhuangbing@126.com*通信作者: 贺智敏（1973－）, 男, 湖南邵阳人, 副教授, 主要研究方向: 混凝土结构耐久性. E-mail: hezhimin@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
