氯盐对碱激发矿渣净浆强度影响试验

发布时间：2018-04-27 08:54

本文选题：氯化钠 + 氯化钙　；参考：《北京航空航天大学学报》2015年04期

【摘要】：通过对掺加氯化钠(Na Cl)、氯化钙(Ca Cl2)的碱激发矿渣(KC)净浆的无侧限抗压强度试验,研究两种氯盐对KC净浆强度的影响规律,利用X射线衍射(XRD)、热重分析(TG-DTG)、液相离子测定、水化程度测定等测试手段,分析两种氯盐对KC净浆强度的作用机理.结果表明,随着Na Cl掺量增加,KC净浆抗压强度提高;随着Ca Cl2掺量增加,KC净浆抗压强度基本不变.掺加Na Cl与Ca Cl2的KC净浆中均生成含氯水化物水化氯铝酸钙(Fs,Friedel’s salt),但Fs的生成对KC净浆强度无影响作用.掺加Na Cl的KC净浆中氢氧化钠(Na OH)的生成是导致其强度增强的主要原因,混合物中Na OH的存在提高了KC净浆的液相碱度,促进矿渣水化的进一步发生,进而生成更多的水化硅酸钙(CSH)使KC净浆强度得到提高.
[Abstract]:The effect of two chloride salts on the strength of KC pure pulp was studied by the experiment of the unconfined compressive strength of alkaline activated slag (KC) slurry mixed with sodium chloride, calcium chloride (CaCl _ 2). X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), liquid phase ion determination were used to study the effect of two chloride salts on the strength of KC pulp. The mechanism of the two chloride salts on the strength of KC pulp was analyzed by measuring the hydration degree. The results show that the compressive strength of KC pulp increases with the increase of NaCl content, and the compressive strength of KC pulp increases with the increase of Ca Cl2 content. In KC pure pulp mixed with NaCl and Ca Cl2, chloride hydrated calcium chloride aluminate hydrates were formed, but the formation of Fs had no effect on the strength of KC pulp. The formation of sodium hydroxide (NaOH) in KC pulp with NaCl is the main reason for its strength enhancement. The presence of NaOH in the mixture increases the liquid alkalinity of KC pulp and promotes the further hydration of slag. Furthermore, more calcium silicate hydrate (CSH) was formed to increase the strength of KC pulp.
【作者单位】：北京航空航天大学交通科学与工程学院;
【基金】：国家自然科学基金资助项目(50278007)
【分类号】：TU528

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