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。
Cementitious materials was prepared with powders of steel slag（SS）, blast furnace slag（BFS） and desulfurized gypsum（DG）. The influence of SS content on the strength of the concrete composted of all industrial solid wastes was investigated. The hydration mechanism of cementitious materials was characterized by means of XRD, IR, TG-DTA and SEM, while the variation of p H and concentration of the specified ions of cementitious materials were acquired during the hydration process. The results show that when the mass ratio of SS, BFS and DG is m（SS）：m（BFS）：m（DG）=30：58：12, the concrete possesses a better compressive strength after curing for 3 d, 7 d and 28 d. With the increasing dosage of SS, the pH value and Ca^（2＋） concentration decreased first and then increased. The initial concentration of solutes of silicon（aluminum） was relatively low and then increased later. In the presence of DG, SS and BFS can synergistically promote the hydration and the major hydration products are ettringite（AFt） andcalcium silicate hydrate（C-S-H） gels. During the later stage of the hydration process, the quantity of hydration products increased rapidly, forming a composite of C-S-H gel as matrix, within which there existed randomly dispersed needle-like AFt crystallites as strengthening phase, thereby, the hardened cement paste became much dense and hard.
作者
崔孝炜
倪文
任超
CUI Xiaowei NI Wen REN Chao(Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2017年第9期687-694,共8页
Chinese Journal of Materials Research
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)~~
关键词
无机非金属材料
胶凝材料
钢渣
水化机理
inorganic non-metallic materials, steel slag, cementitious materials, hydration mechanism
