Early age strength enhancement of blended cement systems by CaCl2 and diethanol-isopropanolamine
Early age strength enhancement of blended cement systems by CaCl2 and diethanol-isopropanolamine
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DOI：
10.1016/j.cemconres.2010.01.008
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发表时间：
2010-06
影响因子：
11.4
通讯作者：
K. Riding;D. A. Silva;K. Scrivener
中科院分区：
文献类型：
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作者：
K. Riding;D. A. Silva;K. Scrivener
研究了氯化钙（CaCl 2）和二乙醇-异丙醇胺（DEIPA）复合体系对水泥体系1天强度的增强作用，特别是在混合水泥体系中。结合定量X射线衍射与Rietveld细化（QXRD），扫描电子显微镜（SEM）/背散射电子图像分析，热重分析（TGA），和等温量热法被用来调查的添加剂的强度增强的机制。发现添加剂通过增强水泥水化来增加早期砂浆强度，其中DEIPA主要增强铝酸盐水化。DEIPA还影响了氢氧钙石的形貌，其形成为薄片状。与此同时，发现C-S-H的钙-硅比随着DEIPA的使用而增加，这可能是因为包含微晶氢氧化钙。48小时后，发现DEIPA直接提高了粒化高炉矿渣和粉煤灰的反应速率。
The enhancement of the 1day strength of cementitious systems by a combination of calcium chloride (CaCl2) and diethanol-isopropanolamine (DEIPA) was studied, particularly in blended cement systems. A combination of quantitative X-ray diffraction with Rietveld refinement (QXRD), scanning electron microscopy (SEM)/backscattered electron image analysis, thermogravimetric analysis (TGA), and isothermal calorimetry were used to investigate the mechanism of strength enhancement by the additives. The additives were found to increase the early age mortar strength by enhancing the cement hydration, with the DEIPA enhancing primarily the aluminate hydration. DEIPA also affected the morphology of portlandite which was formed as thin plates. In parallel, the calcium-to-silica ratio of the C–S–H was found to increase with the use of DEIPA, possibly because of the inclusion of microcrystalline portlandite. After 48h DEIPA was found to directly enhance the rate of reaction of granulated blast-furnace slag and fly ash.