Hydration and hydration products of two-phase Portland cement clinker doped with Na2O
Hydration and hydration products of two-phase Portland cement clinker doped with Na2O
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DOI：
10.1680/adcr.2007.19.3.125
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发表时间：
2007-07
影响因子：
2
通讯作者：
Sebastian Wistuba;D. Stephan;G. Raudaschl‐Sieber;J. Plank
中科院分区：
文献类型：
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作者：
Sebastian Wistuba;D. Stephan;G. Raudaschl‐Sieber;J. Plank
碱是普通波特兰水泥熟料的重要次要成分。特别是Na2O被掺入铝酸盐相中并改变其晶体结构。对于本研究，使用由掺杂有不同量的Na2O的阿利特和铝酸盐组成的定义明确的波特兰水泥熟料。由该熟料制成的水泥的等温传导量热法表明，掺杂Na2O激活了熟料在最初几个小时内的初始放热。它也影响了主要的反应。原位X射线衍射监测水泥水化表明，C3A和石膏的溶解加快了掺入Na2O。在水合的最初几个小时期间，晶体钙矾石和单硫酸盐的形成被延迟。经过90天的水化，大部分的C3A已反应为单硫酸盐，可通过差示扫描量热法，扫描电子显微镜和27铝核磁共振检测。Na_2O含量的增加导致了钙离子浓度的增加。
Alkalis are important minor constituents of ordinary Portland cement clinker. Na2O, in particular, is incorporated into the aluminate phase and alters its crystal structure. For this study, well defined Portland cement clinkers consisting of alite and aluminate doped with different amounts of Na2O were used. Isothermal conduction calorimetry of cements made from this clinker revealed that doping with Na2O activates the initial heat evolution of the clinker during the initial hours. It also influences the main reaction. In situ X-ray diffraction for monitoring cement hydration demonstrates that the dissolution of C3A and gypsum is accelerated by the incorporation of Na2O. The formation of crystalline ettringite and monosulphate during the first few hours of hydration is delayed. After 90 days of hydration, most of the C3A has reacted to monosulphate, detectable by differential scanning calorimetry, scanning electron microscopy and 27Al nuclear magnetic resonance. An increase of the Na2O content brought abo...