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首页> 外文期刊>Journal of Civil, Construction and Environmental Engineering >Assessment of the Semi-Adiabatic Temperature Rise of Mass Concrete Containing Bagasse Ash
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Assessment of the Semi-Adiabatic Temperature Rise of Mass Concrete Containing Bagasse Ash

机译：评估含甘蓝灰分混凝土的半绝热升高

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Previous studies show that pozzolan materials are a wise choice for retarding significant heat in mass concrete placements. This research aims at studying the early age thermal property of concrete containing bagasse ash under different ambient temperatures. Moreover, the compressive strength of concrete specimens with varying ratios of the mix is assessed. Semi-adiabatic temperature rise data of four different concrete mixtures (containing pure Portland cement, 6.5%, 13%, and 20% dosage of bagasse ash by volume) are determined. Concrete specimens of size 30cm*30cm*40cm were cast and insulated using Styrofoam. The temperature measurement is taken at three different locations for every 30 minutes of interval. The influence of ambient temperature on specimens' early age thermal response is studied using a temperature chamber capable of simulating 25.15°C, 35.54°C, and 43.77°C average ambient temperatures. The results indicated that bagasse ash could replace the cement up to an optimum replacement level of 10 percent even if an early age strength drop is observed. The experiment revealed that the bagasse ash in the concrete mixture shift the temperature rise-time profile, reduces the total heat of hydration, and decreases the thermal gradient in the specimens. The peak temperature gauge of all mixes elevated as the ambient temperature increased, but mixtures containing bagasse ash show a slower heat liberation rate relative to the control group. The study proves pozzolan reaction is slow, releasing heat over a long period and not taking place early. It has merit in a massive concrete placement where cooling can lead to cracking following a significant temperature rise.
机译：以前的研究表明，Pozzolan材料是延迟大规模混凝土放置中显着热的明智选择。本研究旨在研究不同环境温度下含有甘蓝灰的混凝土的早期热特性。此外，评估了混合物的混凝土试样的压缩强度。确定四种不同混凝土混合物的半绝热升温数据（含有纯波特兰水泥，6.5％，13％和20％的甘蔗渣灰体积）。使用聚苯乙烯泡沫塑料铸造和绝缘尺寸为30cm * 30cm * 30cm * 40cm的混凝土标本。温度测量在三个不同位置拍摄每30分钟的间隔。使用能够模拟25.15℃，35.54°C和43.77°C平均环境温度的温度室研究了环境温度对试样的初期热响应的影响。结果表明，即使观察到休眠强度下降，Bagasse Ass也可以将水泥替换为10％的最佳替代水平。实验表明，混凝土混合物中的甘蔗渣灰变速温度上升时间曲线，降低了水合的总热量，并降低了样本中的热梯度。随着环境温度的增加，所有混合物的峰值温度计升高，但含有甘蔗糖灰的混合物显示相对于对照组的较慢的热解。该研究证明了Pozzolan反应缓慢，释放热量，在长期内且未早发。它在大规模的混凝土放置中具有优异的优点，其中冷却可能导致在显着的温度升高之后开裂。

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