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首页> 美国卫生研究院文献>Materials >The Effects of Temperature Curing on the Strength Development Transport Properties and Freeze-Thaw Resistance of Blast Furnace Slag Cement Mortars Modified with Nanosilica
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The Effects of Temperature Curing on the Strength Development Transport Properties and Freeze-Thaw Resistance of Blast Furnace Slag Cement Mortars Modified with Nanosilica

机译：温度固化对高炉炉渣水泥砂浆强度发展运输性能和冻融电阻的影响

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摘要

This investigation studies the effects of hot water and hot air curing on the strength development, transport properties, and freeze-thaw resistance of mortars incorporating low-heat blast furnace slag cement and nanosilica (NS). Mortar samples were prepared and stored in ambient conditions for 24 h. After demolding, mortar samples were subjected to two different hot curing methods: Hot water and hot air curing (40 °C and 60 °C) for 24 h. For comparison purposes, mortar reference mixes were prepared and cured in water and air at ambient conditions. Strength development (from 1 to 180 days), capillary water porosity, water sorptivity, and freeze-thaw resistance were tested after 180 days of curing. The experimental results showed that both curing regimes accelerate the strength development of mortars, especially in the first seven days of hydration. The highest early strengths were reported for mortars subjected to a temperature of 60 °C, followed by those cured at 40 °C. The hot water curing regime was found to be more suitable, as a result of more stable strength development. Similar findings were observed in regard to durability-related properties. It is worth noting that thermal curing can more efficiently increase strength in the presence of nanosilica, suggesting that NS is more effective in enhancing strength under thermal curing.
机译：本研究研究了热水和热空气固化对砂浆的强度发育，运输性能和冻融抗性的影响，包括低热高炉炉渣水泥和纳米硅（NS）。制备砂浆样品并储存在环境条件下24小时。脱荫后，对砂浆样品进行两种不同的热固化方法：24小时热水和热空气固化（40℃和60℃）。出于比较目的，在环境条件下制备并在水和空气中制备砂浆参考混合物。在180天的固化后，测试力量发展（从1至180天），毛细管水孔隙率，水吸附性和冻融抗性。实验结果表明，两种固化制度都加速了迫击炮的强度发展，特别是在水合的前七天。据报道，对于温度为60℃的砂浆，将最高的早期强度报告，然后在40℃下固化的砂浆。由于强度发育更稳定，发现热水固化性能更适合。在耐久性相关性质方面观察到类似的发现。值得注意的是，在纳米硅的存在下，热固化可以更有效地增加强度，表明NS更有效地提高热固化下的强度。

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