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用硅灰(SF)和不同温度煅烧后MgO制备水化硅酸镁(MgO-SiO2-H_2O,M-S-H)胶凝材料,研究其流动度、凝结时间、pH值与M-S-H胶凝材料强度及膨胀特性的相互关系。采用X射线衍射和热重分析等测试手段分析了不同温度煅烧的MgO对MgO-SF净浆水化产物和M-S-H结构的影响。结果表明:随着煅烧温度增加,MgO衍射峰强度增加,峰宽变窄,晶粒尺寸增加,活性降低。1 150℃煅烧MgO制备的净浆中Mg(OH)2和M-S-H物相含量高,且M-S-H硅氧四面体聚合程度最大。1 150℃煅烧MgO制备的MgO-SF流动度适中易成型(净浆和砂浆流动度分别为129 mm和206 mm),净浆pH值和凝结时间适中,砂浆强度高、自由膨胀率(εt)最小。εt与Mg(OH)2的含量变化幅度正相关。
Abstract：The relationships among the fluidity,setting time,and pH value of hydrated magnesium silicate(MgO-SiO2-H_2O,M-S-H)prepared by silica fume(SF)and MgO after calcination at different temperatures were investigated,and the strength and shrinkage characteristics of M-S-H cementious materials were analyzed.The effect of MgO on the hydrated products of MgO-SF and the structure of M-S-H at different calcination temperatures was investigated by X-ray diffraction and thermogravimetric analysis.The results show that the intensity of MgO diffraction peak increases,the peak width becomes narrower,the grain size increases,and the activity decreases as the calcination temperature increases.The contents of Mg(OH)2 and M-S-H in the pure pulp prepared by calcining MgO at 1 150℃are the highest,and the degree of polymerization of M-S-H silicon tetrahedron becomes the maximum value.The MgO-SF pulp and mortar slump prepared by calcining MgO at 1 150℃ are 129 mm and 206 mm,respectively,in accordance with the large-flow concrete.The pH value and setting time of the pulp are moderate,the mortar strength is high,and the dry shrinkage rate(εt) is the minimum value.εt is positively correlated to the change in Mg(OH)2 content.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2020.05.20190480
中图分类号:TQ177.5
引用信息:
[1]王倩,武志红,张国丽,等.硅酸镁胶凝材料体积稳定性及水化特性[J].硅酸盐学报,2020,48(05):682-688.DOI:10.14062/j.issn.0454-5648.2020.05.20190480.
基金信息:
国家自然科学基金项目(51974218);; 西安建筑科技大学基础研究基金(JC149 6);; 先进耐火材料国家重点实验室开放基金(SKLAR201905)
2020-03-06
2020-03-06
2020-03-06