The influence of heat and steam curing on the properties of one-part fly ash/slag alkali activated materials: Preliminary results

L. Coppola, D. Coffetti, E. Crotti, R. Dell’Aversano, G. Gazzaniga
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引用次数: 9

Abstract

This paper presents the preliminary results of an experimental research on the influence of heat and steam curing on the performances of one-part alkali-activated mortars based on low calcium fly ash (FA) and ground granulated blast furnace slag (GGBFS) with different GGBFS/FA ratios. The mortars were manufactured at equal water to precursor ratio and were activated by sodium silicate, potassium hydroxide and sodium carbonate in powder form. In general, by growing the GGBFS/FA ratio, the workability of fresh mortars decreases and the elasto-mechanical performance increases, independently of curing conditions. The heat and/or steam curing temperatures equal to 40°C or 60°C promote the development of higher early compressive strength respect to standard curing conditions (20°C), especially at high GGBFS/FA ratios, while no advantages were detected at longer ages.
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热和蒸汽固化对粉煤灰/矿渣组分碱活性材料性能的影响:初步结果
本文介绍了热和蒸汽养护对低钙粉煤灰(FA)和不同矿渣/FA比的矿渣粉(GGBFS)单组分碱活性砂浆性能影响的初步实验研究结果。该砂浆是在水与前驱体的比例相等的条件下制成的,并以水玻璃、氢氧化钾和碳酸钠为粉末状进行活化。总的来说,随着GGBFS/FA比的增加,新鲜砂浆的和易性降低,弹力学性能提高,与养护条件无关。相对于标准养护条件(20°C), 40°C或60°C的高温和/或蒸汽养护温度促进了更高的早期抗压强度的发展,特别是在高GGBFS/FA比时,而在更长的龄期没有发现任何优势。
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