[1]郭寅川,陈志晖,申爱琴,等.基于抗裂性能的高寒地区桥面板混凝土配合比优化设计[J].长安大学学报(自然科学版),2019,39(04):1-8.
　GUO Yin chuan,CHEN Zhi hui,SHEN Ai qin,et al.Optimization mix design of bridge deck concrete based on crack resistance in alpine regions[J].Journal of Chang’an University (Natural Science Edition),2019,39(04):1-8.
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基于抗裂性能的高寒地区桥面板混凝土配合比优化设计()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年04期
页码:
1-8
栏目:
道路工程
出版日期:
2019-07-15

文章信息/Info

Title:
Optimization mix design of bridge deck concrete based on crack resistance in alpine regions
作者:
郭寅川; 陈志晖; 申爱琴; 李鹏
（长安大学 特殊地区公路工程教育部重点实验室，陕西 西安 710064）
Author(s):
GUO Yinchuan;  CHEN Zhihui;  SHEN Aiqin;  LI Peng
（Key Laboratory of Highway Engineering in Special Region of Ministry of Education， Chang‘an University， Xi‘’an 710064， Shaanxi, China）
关键词:
道路工程; 配合比建议值; 收缩试验; 抗裂性能; 高寒地区; 微观机理
Keywords:
road engineering;  recommended value of mix proportion;  shrinkage test;  anti cracking performance;  alpine region;  microscopic mechanism
文献标志码:
A
摘要:
为解决高寒地区桥面板混凝土早期收缩抗裂性不足的问题，在室内模拟高寒地区桥面板工作环境并通过干缩和塑性收缩试验，研究水灰比、水泥用量和减水剂掺量对高寒环境下桥面板混凝土早期收缩阻裂性能的影响规律；采用扫描电子显微镜（SEM）测试技术对混凝土收缩裂缝的产生和演化过程进行微观剖析，从而提出基于抗裂性能的高寒地区桥面板混凝土配合比设计建议值。研究结果表明：水灰比是影响高寒地区桥面板混凝土早期收缩性能的重要因素，高水灰比有利于提高C40桥面板混凝土早期收缩抗裂性能，也利于早龄期养护水的渗入，但水灰比高于0.49时混凝土塑性抗裂性能会呈现劣化趋势；水泥用量增加会显著增大桥面板混凝土7 d内的收缩值，加速塑性裂缝的贯通，且水泥用量每增加80 kg/m3，塑性开裂时间将提前20 min，贯通开裂时间将缩短32 min，因此水泥用量应控制在260~300 kg/m3之间为宜；高效缓凝减水剂的掺入会细化混凝土内部初始裂缝，使其在收缩时呈现多向劣化趋势且贯通裂缝宽度也会显著增大，对有工作性能要求的桥面板混凝土，减水剂掺量应控制在0.5%~0.8%之间为宜；桥面板混凝土前5 d的收缩值占7 d总收缩值的80%以上，且在第5 d达到峰值，所以应尽可能延长养护时间至第5 d，以减少早期水化带来的收缩裂缝。
Abstract:
In order to solve the early shrinkage cracking problem of bridge deck concrete in alpine regions, the concrete working environment of the alpine regions were simulated, the dry shrinkage and plastic shrinkage tests of water cement ratio were conducted, and the effects of the cement and superplasticizer on the cracking performance of the bridge deck concrete were determined. By using SEM electron microscopy, concrete shrinkage cracks and the evolution process of the micro analysis were clearly identified, and the design proposal for the alpine region based on the crack resistance of concrete bridge deck was presented. The results show that the water cement ratio is an important factor affecting the early shrinkage and crack resistance of the concrete bridge panel in the alpine area. The high water cement ratio was helpful in improving the early shrinkage and crack resistance of the concrete deck C40 bridge and it was conducive to the early age curing the infiltration of water. However, a water cement ratio higher than 0.49 would appear inferior when the crack resistance of concrete mixed plastic and the trend increase, the dosage of cement increased significantly in the 7 d panel concrete shrinkage crack, accelerated through shaping, and increased further to 80 kg/m3, shaping the cracking time would advance 20 min, the though time would be shortened 32 min, so based on the dry shrinkage and plastic shrinkage test results, the best mixing amount should be controlled within 260~300 kg/m3. The superplasticizer was added to refine the initial crack concrete, which made it appear more deterioration trend and its meso crack width was in contraction increased for bridge deck concrete work requirements, the content should be controlled between 0.5%~0.8%; 5 d before the bridge deck concrete shrinkage value accounted for more than 7 d total shrinkage of 80%, and reached the peak at fifth days, it should be as far as possible to extend the curing time to fifth days to reduce early the hydration shrinkage crack. 1 tab, 13 figs, 23 refs.

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更新日期/Last Update: 2019-07-29