| 蒸养制度对预制桥面板混凝土强度与抗渗性的影响 |
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| 引用本文： | 黄安,李北星,杨建波,王丽静.蒸养制度对预制桥面板混凝土强度与抗渗性的影响[J].硅酸盐通报,2021,40(4):1170-1177. |
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| 作者姓名： | 黄安 李北星 杨建波 王丽静 |
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| 作者单位： | 武汉理工大学,硅酸盐建筑材料国家重点试验室,武汉 430070;湖北长江路桥股份有限公司,武汉 430077 |
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| 基金项目： | 国家重点研发计划(2020YFC1909904) |
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| 摘 要： | 为了获得预制桥面板的最佳蒸养制度,研究了蒸养温度、蒸养时间及蒸养后补充养护方式对复掺粉煤灰和矿粉配制的C55混凝土的强度和氯离子扩散系数的影响,并采用X-射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了不同蒸养制度下胶凝材料浆体的物相组成和微结构。结果表明,蒸养温度的提高和蒸养时间的延长,对水泥的水化和浆体微结构形成有促进作用,提高了混凝土的脱模强度,但降低了混凝土的后期强度和抗氯离子渗透性能。混凝土蒸养后的补充湿润养护为未水化水泥和矿物掺合料的持续水化提供水化用水,有利于混凝土的后期强度增进和抗渗性提高。预制桥面板在55 ℃温度下蒸养6 h,蒸养后补充覆盖洒水养护7 d具有较好的综合性能。
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| 关 键 词： | 混凝土 蒸养制度 抗压强度 抗渗性能 微结构 |
| 收稿时间： | 2020-12-14 |
Effect of Steam Curing System on Strength and Impermeability of Precast Bridge Deck Concrete |
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| HUANG An,LI Beixing,YANG Jianbo,WANG Lijing.Effect of Steam Curing System on Strength and Impermeability of Precast Bridge Deck Concrete[J].Bulletin of the Chinese Ceramic Society,2021,40(4):1170-1177. |
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| Authors: | HUANG An LI Beixing YANG Jianbo WANG Lijing |
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| Affiliation: | 1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Changjiang Road Bridge Co., Ltd., Wuhan 430077, China |
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| Abstract: | In order to obtain the best steam curing system for precast bridge deck concrete, the effects of steam curing temperature, steam curing time and supplementary curing method after steam curing on strength and chloride ion diffusion coefficient of C55 concrete incorporated with fly ash and slag powder were studied. The phase composition and microstructure of the cementitious paste hydrated under different steam curing systems were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the higher steam curing temperature and the longer steam curing time promote the hydration of cement and the formation of the paste microstructure, which increase the demoulding strength of concrete, but reduce the later strength and the resistance to chloride ion penetration of concrete. The supplementary moisture curing after steam curing provided hydration water for the continuous hydration of unhydrated cement and mineral admixtures, which helps to improve the later strength and impermeability of concrete. The precast bridge deck concrete has good comprehensive performance when it is steam cured for 6 h at 55 ℃ and then wet cured for 7 d with covering of geotextile. |
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| Keywords: | concrete steam curing system compressive strength impermeability microstructure |
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