冶金渣制备高强人工鱼礁结构材料的试验研究

李颖,倪文,陈德平,王中杰,张斌

(北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083)



摘要:

为了研究钢渣粉磨时间和矿渣钢渣复掺比例对矿渣-钢渣-熟料-石膏体系胶凝材料强度的影响,采用一次线性回归得到胶凝材料强度的变化趋势,并利用XRD和SEM方法分析钢渣粉磨和净浆的水化过程.试验表明:矿渣与钢渣的复合比为7∶1,钢渣和矿渣的比表面积分别为550和480m²/kg,且与质量分数10%的水泥熟料和质量分数10%的脱硫石膏复合的胶凝材料具有较高的强度.以优化后的胶凝材料代替水泥,并以热闷法稳定化的钢渣颗粒为骨料,可以制备出抗压强度达到60MPa以上,水泥熟料总用量为2%的高强人工鱼礁混凝土.研究表明,对钢渣适度粉磨能改善钢渣性能,适量加入钢渣对促进体系的水化有积极作用.

关键词:  钢渣  矿渣  胶凝材料  高强混凝土  人工鱼礁

DOI：10.11951/j.issn.1005-0299.20130113

分类号:

基金项目:国家海洋局海洋公益性行业科研专项经费重点项目(200805030).



A primary investigation on preparing of a new structural material from iron and steel slags for high-strength artificial reefs

LI Ying,NI Wen,CHEN De-ping,WANG Zhong-jie,ZHANG Bin

(Key Laboratory of High-Efficient Mining and Safety of Metal Mines(Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China)

Abstract:

A cementitious material of iron slag-steel slag-clinker-gypsum system was prepared and the effect of grinding time of steel slag and mixing ratio of iron slag to steel slag on the strength was investigated.A linear regression was used to get the strength change trend of cementitious material,XRD and SEM were used to analyze the grinding process of steel slag and the hydration process of the cementitious material net slurry.The results showed that with the ratio of iron slag :steel slag= 7∶1,and when 10% cement clinker and 10% gypsum of Flue Gas Desulfurization Waste(FGDW) were mixed with 80% iron and steel slags powder,the mixed cementitious material had an optimized strength.The optimized specific surface area are 550m²/kg and 480m²/kg for steel slag and iron slag powder respectively.The ordinary portland cement can be totally substituted by such a mixed cementitious material with iron and steel slags as its major components in preparing the concrete for building high-strength artificial reefs.A concrete with a compressive strength over 60MPa can be prepared by using such a mixture as a cementitious material and steel slag grains as its fine and coarse aggregates which have been stabilized by a hot-simmering method.The total usage of cement clinker can be as low as 2% in weight in the final high strength artificial reef concrete.The results show that a moderate grinding process can improve the reaction property of the steel slag.A proper mixing ratio of steel slag powder into the system is helpful to the hydration process.

Key words:  iron and steel slags  cementitious material  high-strength concrete  artificial reefs