硅酸盐学报

矿物掺合料对蒸养高强浆体抗压强度及孔结构的影响

作者：熊蓉蓉龙广成谢友均王猛

单位：中南大学土木工程学院长沙 410075

分类号：TU528.31

出版年,卷(期):页码：2017,45(2):175-181

DOI：10.14062/j.issn.0454-5648.2017.02.01

摘要：

为明确胶凝组分对蒸养混凝土性能与孔结构的影响规律，以铁路预制预应力梁、轨道板用典型蒸养混凝土配比及其生产工艺为基础，研究了粉煤灰、矿渣、硅灰及石灰石粉等矿物掺合料对蒸养水泥浆体抗压强度、孔结构的影响，采用胶凝系数指标分析了蒸养条件下不同掺合料的强度贡献以及蒸养浆体抗压强度与孔隙率之间的关系。结果表明：分别掺上述矿物掺合料蒸养浆体28 d龄期后的强度均低于基准试样；本蒸养条件并没有促进粉煤灰火山灰活性的提早发挥，其3、28 d龄期下的胶凝系数较小且两者基本相同，仅约为90 d龄期胶凝系数的20%；而矿渣、硅灰、石灰石粉3 d龄期的胶凝系数显著大于其后期的胶凝系数；随各矿物掺合料的掺入，蒸养浆体28 d龄期、90 d龄期的总孔隙率呈现增加趋势；孔径大于20 nm的较大孔隙对蒸养浆体抗压强度的不利影响要大于孔径小的孔隙。

The influences of mineral admixtures including fly ash (FA), slag, silica fume and limestone powder on the compressive strength and pore structure of steam-cured high-strength cement paste were investigated based on typical mix proportions of steam-cured concrete and the corresponding production technology used in steam-cured pre-stressed beam and track slab. The parameter of cementitious coefficient was employed to analyze the strength-contribution of mineral admixtures on paste. And the relationship between compressive strength and pore structure of paste was also discussed. The results show that the strength of steam-cured paste with mineral admixtures after 28 d age is lower than that of control sample without mineral admixtures. Under steam-curing condition, the pozzolanic activity of fly ash shows no obvious acceleration and the cementitious coefficient of FA at 3 d or 28 d age is low and only approximately 20% of that at 90 d. The cementitious coefficient of slag, silica fume and limestone powder at 3 d is significantly greater than that at later ages. The total porosity of steam-cured paste at both 28 d and 90 d increases with the increasing the mineral admixture. Pore with diameter of over 20 nm has a great negative impact on compressive strength of steam-cured paste.

基金项目：

高铁联合基金(U1534207)；国家“973”计划(2013CB036201) 资助项目

作者简介：

熊蓉蓉(1991—)，女，硕士研究生

参考文献：

[1]谢友均, 马昆林, 刘运华, 等. 蒸养超细粉煤灰高性能混凝土性能试验研究[J]. 深圳大学学报: 理工版, 2007, 24(3): 234–239.

XIE Youjun, MA Kunlin, LIU Yunhua, et al. J Shenzhen Univ (in Chinese), 2007, 24(3): 234–239.

[2]肖茜. 蒸养条件下外加剂对混凝土性能的影响[D]. 西安: 西安建筑科技大学, 2013.

XIAO Qian. Effect of admixture on performance of steam cured concrete (in Chinese, dissertation). Xi’an: Xi’an University of Architecture and Technology, 2013.

[3]LOTHENBACH B, WINNEFELD F, WIELAND E, et al. Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastes[J]. Cem Concr Res, 2007, 37(37): 483–491.

[4]KJELLSEN K O, DETWILER R J, GJORV O E. Pore structure of plain cement pastes hydrated at different temperatures[J]. Cem Concr Res, 1990, 20(6): 927–933.

[5]孙伟, 缪昌文. 现代混凝土理论与技术[M]. 北京: 科学出版社, 2012: 2–5.

[6]刘宝举, 谢友均, 李建. 粉煤灰-矿渣复合超细粉蒸养混凝土力学性能[J]. 建筑材料学报, 2002(4): 311–315.

LIU Baoju, XIE Youjun, LI Jian. J Build Mater (in Chinese), 2002(4): 311–315.

[7]阎培渝, 张庆欢. 含有活性或惰性掺合料的复合胶凝材料硬化浆体的微观结构特征[J]. 硅酸盐学报, 2006, 34(12): 1491–1496.

YAN Peiyu, ZHANG Qinghuan. J Chin Ceramc Soc, 2006, 34(12): 1491–1496.

[8]阎培渝, 张庆欢. 含粉煤灰或石英粉复合胶凝材料的抗压强度发展规律[J]. 硅酸盐学报, 2007, 35(3): 263–267.

YAN Peiyu, ZHANG Qinghuan. J Chin Ceramc Soc, 2007, 35(3): 263–267.

[9]刘仍光, 阎培渝. 水泥–矿渣复合胶凝材料中矿渣的水化特性[J]. 硅酸盐学报, 2012, 40(8): 1112–1118.

LIU Rengguang, YAN Peiyu. J Chin Ceramc Soc, 2012, 40(8): 1112–1118.

[10]韩方晖, 刘仍光, 阎培渝. 矿渣对复合胶凝材料硬化浆体微观结构的影响[J]. 电子显微学报, 2014(1): 40–45.

HAN Fanghui, LIU Rengguang, YAN Peiyu. J Chin Electron Microscopy Soc (in Chinese), 2014(1): 40–45.

[11]周万良, 方坤河. 矿渣掺量对胶砂和混凝土强度的影响[J]. 硅酸盐通报, 2012, 31(2): 322–326.

ZHOU Wanliang, FANG Kunhe. Bull Chin Ceram Soc (in Chinese), 2012, 31(2): 322–326.

[12]Zhang W, Zhang Y, Liu L, et al. Investigation of the influence of curing temperature and silica fume content on setting and hardening process of the blended cement paste by an improved ultrasonic apparatus[J]. Construct Build Mater, 2012, 33(7): 32–40.

[13]MITCHELL D R G, HINCZAK I, DAY R A. Interaction of silica fume with calcium hydroxide solutions and hydrated cement pastes[J]. Cem Concr Res, 1998 , 28(11): 1571–1584.

[14]肖佳, 金勇刚, 勾成福, 等. 石灰石粉对水泥浆体水化特性及孔结构的影响[J]. 中南大学学报: 自然科学版, 2010(6): 2313–2320.

XIAO Jia, JIN Yonggang, GOU Chengfu, et al. J Central South Univ: Sci Technol (in Chinese), 2010(6): 2313–2320.

[15]TERMKHAJORNKIT P, BARBARULO R. Modeling the coupled effects of temperature and fineness of Portland cement on the hydration kinetics in cement paste[J]. Cem Concr Res, 2012, 42(3): 526–538.

[16]ESCALANTE-GARCIA GARCI?A J I, SHARP J H. Effect of temperature on the hydration of the main clinker phases in Portland cements: Part I, neat cements[J]. Cem Concr Res, 1998, 28(28): 1245–1257.

[17]焦宝祥, 钟白茜. 激发剂对粉煤灰–Ca(OH)2系统性能的影响[J]. 粉煤灰综合利用, 2001(1): 7–10.

JIAO Baoxiang, ZHONG Baiqian. Fly Ash Comprehen Util (in Chinese), 2001(1): 7–10.

[18]PAPADAKIS G, TSIMAS S. Supplementary cementing materials in concrete, Part Ⅰ: efficiency and design[J]. Cem Concr Res, 2002,32(9): 1525–1532.

[19]蒲心诚. 应用比强度指标研究活性矿物掺料在水泥与混凝土中的火山灰效应[J]. 混凝土与水泥制品, 1997(3): 6–14.

PU Xingcheng. China Concr Cem Prod (in Chinese), 1997(3): 6–14.

[20]龙广成, 王新友, 肖瑞敏. 混凝土矿物掺合料的强度效应研究[J]. 硅酸盐学报, 2002, 30(2): 139–143.

LONG Guangcheng, WANG Xinyou, XIAO Minrui. J Chin Ceram Soc, 2002, 30(2): 139–143.

[21]龙广成, 谢友均, 王培铭. 粉煤灰强度效应的研究[J]. 铁道科学与工程学报, 2005, 2(1): 19–24

LONG Guangcheng, XIE Youjun, WANG Peiming. J Rail Way Sci Eng (in Chinese), 2005, 2(1): 19–24

[22]肖佳, 许彩云. 石灰石粉对水泥混凝土性能影响的研究进展[J]. 混凝土与水泥制品, 2012(7): 75–80.

Xiao Jia, Xu Caiyun. China Concr Cem Prod (in Chinese), 2012(7): 75–80.

[23]郑克仁, 孙伟, 贾艳涛, 等. 矿渣掺量对高水胶比水泥净浆水化产物及孔结构的影响[J]. 硅酸盐学报, 2005, 33(4): 520–524.

ZHENG Keren, SUN Wei, JIA Yantao, et al. J Chin Ceram Soc, 2005, 33(4): 520–524.

[24]刘伟, 邢锋, 谢友均. 水灰比、矿物掺合料对混凝土孔隙率的影响[J]. 低温建筑技术, 2006(1): 9–11.

LIU Wei, XING Feng, XIE Youjun. Low Temp Archit Technol (in Chinese), 2006(1): 9–11.

[25]马昆林, 谢友均, 刘运华. 粉煤灰对混凝土孔隙率及强度的影响[J]. 粉煤灰综合利用, 2007(5): 3–5.

Ma Kunlin, Xie Youjun, Liu Yunhua. Fly Ash Comprehen Util (in Chinese), 2007(5): 3–5.

[26]刘仍光, 丁士东, 阎培渝. 水泥-矿渣复合胶凝材料硬化浆体的微观结构(英文)[J]. 硅酸盐学报, 2015, 43(5): 610–618.

LIU Rengguang, DING Shidong, YAN Peiyu. J Chin Ceram Soc, 2015, 43(5): 610–618.

[27]贺智敏. 蒸养混凝土的热损伤效应及其改善措施研究[D]. 长沙: 中南大学, 2012.

HE Zhimin. Heat damage effects of steam curing on concrete and corresponding improvement measure (in Chinese, dissertation). Changsha: Central South University, 2012.

[28]Odler I, Abdul-Maula S. Investigations on the relationship between porosity structure and strength of hydrated portland cement pastes III. Effect of clinker composition and gypsum addition[J]. Cem Concr Res, 1987, 17(1): 22–30.

服务与反馈：

【文章下载】【加入收藏】