低气压对水泥基材料性能及水化进程的影响
作者:
作者单位:

1.长安大学 公路学院,陕西 西安 710064;2.中交第二公路工程局有限公司,陕西 西安 710065;3.中交集团山区长大桥隧建设技术研发中心,陕西 西安 710199

作者简介:

包卫星(1979—),男,新疆乌鲁木齐人,长安大学教授,博士生导师,博士.E-mail:baowx@chd.edu.cn

通讯作者:

陈 锐(1987—),男,广西来宾人,长安大学副教授,硕士生导师,博士.E-mail:rchenua@chd.edu.cn

中图分类号:

TU528.01

基金项目:

新疆维吾尔自治区重大科技专项项目(2020A03003-7);陕西省自然科学基金资助项目(2022JM-228);中央高校基本科研业务费专项资金项目(300102211302);陕西省自然科学基础研究计划项目(2021JM-180)


Effect of Low Atmospheric Pressure Environment on Properties and Hydration Process of Cement-Based Materials
Author:
Affiliation:

1.School of Highway, Chang’an University, Xi’an 710064, China;2.CCCC Second Highway Engineering Co., Ltd., Xi’an 710065, China;3.Research and Development Center on Construction Technology of Long Bridge and Tunnel in Mountain Areas, CCCC, Xi’an 710199, China

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    摘要:

    采用强度试验、X射线衍射仪和综合热分析仪等手段,研究了低气压对水泥基材料性能及水化进程的影响.结果表明:低养护气压延缓了水泥水化进程,水化产物生成量减小,且养护气压越低,影响效果越显著,3~7 d龄期时出现明显的水化平台期;低养护气压下水泥基材料孔隙结构劣化,凝胶孔占比增长幅度最大;养护气压越低,水泥基材料吸水速率越快,吸水量越大;水泥基材料的吸水量、吸水速率及相对吸水率均随着环境气压的降低明显减小.

    Abstract:

    The effects of low atmospheric pressure on the properties and hydration process of cement-based materials were studied by strength tests, X-ray scanning and comprehensive thermal analysis. The results show that the low curing atmospheric pressure delays the cement hydration process, the generation of hydration products decreases, and the lower the curing atmospheric pressure, the more significant the impact effect. An obvious hydration plateau period appeares at the age of 3-7 days. Under the low curing atmospheric pressure, the pore structure of the cement-based marerials deteriorates, and the proportions of gel pore growth is the largest. The lower the curing atmospheric pressure, the higher the water absorption rate, and the greater water absorption amount. However, the water absorption, water absorption rate and relative water absorption rate of the cement-based marerials all decrease significantly with the decrease of environmental atmospheric pressure.

    表 2 不同养护气压下水泥净浆凝胶结合水的含量Table 2 Bound water content(by mass) of cement pastes under different curing atmospheric pressures
    图1 试件制备及养护过程Fig.1 Preparation and curing process of specimens
    图2 不同养护气压下水泥砂浆的抗压及抗折强度Fig.2 Compressive and flexural strength of cement mortars under different curing atmospheric pressures
    图3 不同养护气压下水泥净浆的XRD图谱Fig.3 XRD patterns of cement pastes under different curing atmospheric pressures
    图4 不同养护气压下水泥净浆的TG-DSC曲线Fig.4 TG-DSC curves of cement pastes under different curing atmospheric pressures
    图5 不同养护气压下水泥砂浆的孔隙分布及占比Fig.5 Pore size distribution and proportion of cement mortars under different curing atmospheric pressures
    图6 不同环境气压下水泥砂浆的毛细吸水性能Fig.6 Capillary water absorption property of cement mortars under different curing atmospheric pressures
    图7 不同环境气压下单侧封闭毛细管内水分迁移现象示意图Fig.7 Water migration in unilateral closed capillary under different environmental atmospheric pressures
    图8 不同环境气压下试件PS-101的相对吸水率Fig.8 Relative water absorption of specimen PS-101 under different environmental atmospheric pressures
    表 1 水泥的化学组成Table 1 Chemical composition(by mass) of cement
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引用本文

包卫星,孙勋,陈锐.低气压对水泥基材料性能及水化进程的影响[J].建筑材料学报,2024,27(9):773-779

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  • 收稿日期:2023-11-03
  • 最后修改日期:2024-01-06
  • 在线发布日期: 2024-10-11
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