极旱、大温差地区养护方式对混凝土桥墩性能的影响

doi:10.11988/ckyyb.20170348

长江科学院院报 ›› 2018, Vol. 35 ›› Issue (12): 148-153.DOI: 10.11988/ckyyb.20170348

极旱、大温差地区养护方式对混凝土桥墩性能的影响

刘建勋^1,2, 赵文斌², 张戎令², 芮雪³, 赵永鹏³, 康健²

1.甘肃省交通运输厅,兰州 730050;
2.兰州交通大学土木工程学院,兰州 730070;
3.甘肃路桥建设集团有限公司,兰州 730030

收稿日期:2017-03-27 出版日期:2018-12-01 发布日期:2018-12-18
通讯作者: 赵文斌(1990-),男,甘肃庆阳人,硕士研究生,主要从事预制混凝土箱梁裂缝预防及控制的研究。E-mail:1079913040@qq.com
作者简介:刘建勋(1970-),男,甘肃武威人,教授级高级工程师,博士研究生,主要从事桥梁全寿命的应用及研究。E-mail:18209315888@139.com
基金资助:
甘肃省交通运输厅科研项目(201606);长江学者和创新团队发展计划滚动支持(IRT15R29);陇原青年创新人才扶持计划项目

Effects of Curing Methods on the Performance of Concrete Bridge Piers in Extremely Dry Area with Large Temperature Difference

LIU Jian-xun^1,2, ZHAO Wen-bin², ZHANG Rong-ling², RUI Xue³, ZHAO Yong-peng³, KANG Jian²

1.Gansu Provincial Department of Transportation, Lanzhou 730050, China;
2.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
3.Gansu Bridge and Road Construction Corporation Ltd., Lanzhou 730030, China

Received:2017-03-27 Online:2018-12-01 Published:2018-12-18

摘要/Abstract

摘要： 为研究极旱、大温差地区不同养护方式及不同养护天数下混凝土桥墩的强度及抗渗性、微观孔结构之间的关系,选择4种养护方式及3个养护天数(7,14,28 d)对试验桥墩进行了研究。在龄期28 d时对混凝土桥墩的强度、抗渗性和微观孔结构进行了测试和分析,结果表明:按照自然养护、土工布养护、新材料养护、标准养护的顺序最可几孔径及多害孔不断减小,抗渗性逐渐增强;随着养护天数的增加,混凝土的抗渗性、强度、多害孔逐渐下降;养护天数>14 d时,混凝土桥墩各项性能良好,建议养护天数为14 d;新材料养护优于土工布养护,在极旱、大温差地区养护方式的保湿效果越好混凝土桥墩的抗渗性及强度越高。

关键词: 极旱、大温差, 混凝土桥墩, 抗渗性, 微观孔结构, 养护方式

Abstract: The relationship among strength, impermeability, and micro-pore structure of concrete bridge pier cured with four different methods at three different curing ages (7d, 14 d, 28d) is examined in extremely dry area with large temperature difference. The strength, impermeability and pore structure of concrete pier are tested and analyzed on the 28^th day of curing. Results demonstrate that the most probable pore and the harmful pore in natural curing condition are the largest, followed by those under geotextile curing, new material curing, and standard maintenance in sequence, indicating an improvement of impermeability. With the increase of curing age, the impermeability, strength, and harmful pore of concrete gradually decline; when curing age exceeds 14 days, the concrete pier performs well, hence we suggest curing for 14 days. New material is superior to geotextile in maintenance. Better moisturizing effect of curing method could result in higher strength and impermeability.

Key words: extremely dry with large temperature difference, concrete bridge pier, impermeability, micro-pore structure, curing method

中图分类号:

TV698.1

刘建勋, 赵文斌, 张戎令, 芮雪, 赵永鹏, 康健. 极旱、大温差地区养护方式对混凝土桥墩性能的影响[J]. 长江科学院院报, 2018, 35(12): 148-153.

LIU Jian-xun, ZHAO Wen-bin, ZHANG Rong-ling, RUI Xue, ZHAO Yong-peng, KANG Jian. Effects of Curing Methods on the Performance of Concrete Bridge Piers in Extremely Dry Area with Large Temperature Difference[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2018, 35(12): 148-153.

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极旱、大温差地区养护方式对混凝土桥墩性能的影响

Effects of Curing Methods on the Performance of Concrete Bridge Piers in Extremely Dry Area with Large Temperature Difference

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