钢渣矿渣基全固废胶凝材料的水化反应机理

发布时间：2018-07-22 14:30

【摘要】：以钢渣、矿渣和脱硫石膏为主要原料制备胶凝材料,使用XRD、IR、TG-DTA和SEM等手段探究胶凝材料的水化反应机理,研究了钢渣掺量对全固废混凝土强度的影响,以及胶凝材料浆体的p H值和代表性离子浓度的变化规律。结果表明,当原料质量比为m(钢渣):m(矿渣):m(石膏)=30:58:12时,全固废混凝土3 d、7 d和28 d可以获得较优的强度。随着反应龄期的增加胶凝材料水化溶液的pH值先减小后增大,Ca2+浓度和硅(铝)溶解物的早期浓度较低,后期浓度有所提高。在脱硫石膏的激发下钢渣和矿渣相互促进水化,水化产物以钙矾石(AFt)和水化硅酸钙(C-S-H)凝胶为主。在反应的后期,水化产物的数量迅速增加。针棒状的AFt晶体穿插在C-S-H凝胶内,使硬化浆体的结构更加致密。
[Abstract]:The cementing materials were prepared from steel slag, slag and desulphurized gypsum as main raw materials. The hydration reaction mechanism of cementing materials was investigated by means of XRDD, TG-DTA and SEM, and the effect of steel slag content on the strength of solid waste concrete was studied. And the change of pH value and representative ion concentration of cementitious paste. The results show that when the mass ratio of raw material is m (steel slag): M (gypsum) 30: 58: 12, the strength of the whole solid waste concrete can be obtained for 3 days, 7 days and 28 days. With the increase of reaction age, the pH value of the hydration solution of the cementitious material decreases first, then increases the concentration of Ca 2 + and the concentration of silicon (Al) dissolved in the early stage, but increases in the later stage. Under the excitation of desulphurization gypsum, steel slag and slag promote hydration mutually. The hydration products are ettringite (aft) and calcium silicate hydrate (C-S-H) gel. At the late stage of the reaction, the number of hydration products increased rapidly. The needle rod shaped after crystal was inserted into the C-S-H gel, which made the hardened paste more compact.
【作者单位】：北京科技大学工业典型污染物资源化处理北京市重点实验室;商洛学院陕西省尾矿资源综合利用重点实验室;
【基金】：国家高技术研究发展计划(2012AA062405) 陕西省尾矿资源综合利用重点实验室开放基金(2014SKY-WK001) 陕西省自然科学基金(2017JM5125)~~
【分类号】：TU526

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