负温环境下电养护对砂浆成型温度及早期强度的影响
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1.四川大学建筑与环境学院;2.西藏藏建科技股份有限公司;3.西藏大学工学院

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TU375.4

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Effect of electric curing on mortar forming temperature and early strength under negative temperature environment
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1.College of Architecture and Environment,Sichuan University,Cheng du;2.Tibet Zangjian Technology Co,Ltd;3.College of Engineering,Tibet University

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    摘要:

    为了研究负温环境下电养护对掺甲酸钙早强剂的砂浆早期强度发展的影响,向砂浆内掺入胶凝材料质量百分数2%的甲酸钙早强剂,并在-10℃环境下通以交流电进行电养护。试验过程中,通过温度仪监测了不同通电参数下砂浆内部温度实时变化,最后测试了不同通电参数下砂浆通电1d的强度以及后续标准养护3d、7d的强度。试验结果表明:砂浆中添加甲酸钙后能够有效降低电阻从而提高通电效率,添加甲酸钙的砂浆试件初始电阻为未添加甲酸钙砂浆的1/4,使其在较低外加电压下取得良好升温效果;甲酸钙在电养护1d后同样具有明显的早强作用,可以促进砂浆早期强度发展,掺甲酸钙砂浆的3d、7d强度较相同通电参数下的未掺甲酸钙砂浆分别提高了59%、29%。

    Abstract:

    In order to study the effect of electric curing on the early strength development of mortar mixed with calcium formate early strength agent under a negative temperature environment, calcium formate early strength agent with 2% mass of cementitious material was mixed into the mortar, and electric curing was carried out by passing alternating current in a -10°C environment. During the test, the real-time changes of the mortar internal temperature under different energization parameters were monitored by a thermometer, and finally, the strength of the mortar energized for 1 day and the strength of subsequent standard curing for 3 days and 7 days under different energization parameters were tested. The test results show that the addition of calcium formate to the mortar can effectively reduce the resistance and thus improve the energizing efficiency, and the initial resistance of the mortar specimens with calcium formate is 1/4 that of the mortar without calcium formate, so that it can achieve a good heating effect at a lower applied voltage. Calcium formate also has an obvious early strength effect after 1 day of electric curing, which can promote the early strength development of the mortar. The strengths at 3 days and 7 days of the calcium formate-doped mortar increased by 59% and 29%, respectively, compared with the un-doped calcium formate mortar under the same energizing parameters.

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  • 收稿日期:2022-10-27
  • 最后修改日期:2023-03-16
  • 录用日期:2023-04-07
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