HYDRATION OF SODIUM PHOSPHATE-MODIFIED HIGH-ALUMINA CEMENT
HYDRATION OF SODIUM PHOSPHATE-MODIFIED HIGH-ALUMINA CEMENT
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DOI：
10.1557/jmr.1994.1291
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发表时间：
1994-05-01
影响因子：
2.7
通讯作者：
BROWN, PW
中科院分区：
文献类型：
--
作者：
MA, WP;BROWN, PW
在高铝水泥（HAC）中，通过掺入10%和20%重量%的磷酸盐基添加剂，可以实现高强度。为了建立导致更高强度的机理，研究了多种缩合磷酸钠（NaPO3）n、（NaPO3）n、（NaPO3）n的作用。研究了Na2O、Na5P3010和（naapo3）3。用等温量热法研究了这些添加剂对水化动力学的影响。磷酸盐的加入增强了反应性，但x射线衍射分析没有发现新的结晶含磷酸盐水化产物的证据。利用环境扫描电镜实时观察微观结构演变，观察到水化产物具有不同的形态。所展示的特征从无定形到多边形、板状和纤维状不等。这些通常形成于晶体铝酸钙水合物颗粒之间，通过这样做似乎提供了一种增强这些胶结物强度的方法。尽管形态上存在差异，但伴随能量色散x射线分析表明，这些产物的成分变化不大。它们的组成范围为52-60 wt. % Al2O3, 20-26 wt. % P2O5和20-24 wt. % CaO。
High strength can be achieved in high alumina cement (HAC) through the incorporation of phosphate-based additions at levels of 10 and 20 wt. %. In order to establish the mechanism that results in higher strength, the effects of a variety of condensed sodium phosphates (NaPO3)n, (NaPO3)n . Na2O, Na5P3010, and (NaPO3)3 were studied. The influence of these additions on the kinetics of hydration was studied using isothermal calorimetry. The phosphatic additions enhanced reactivity, but x-ray diffraction analyses did not reveal evidence of new crystalline phosphate-containing hydration products. Microstructural evolution was examined in real time using environmental SEM, and hydration products exhibiting distinct morphologies were observed. The features exhibited ranged from amorphic to polygonal shapes, plates, and fibers. These frequently formed between crystalline calcium aluminate hydrate grains and by doing so appear to provide a means to enhance the strengths of these cements. In spite of the morphological variations, companion energy dispersive x-ray analysis showed that the compositions of these products did not vary widely. Their ranges of compositions are 52-60 wt. % Al2O3, 20-26 wt. % P2O5, and 20-24 wt. % CaO.