摘要
为了揭示矿渣微粉在混凝土中的作用机理,立足于三因素三水平正交试验同时结合宏观性能测试和微观结构分析,通过探究矿渣微粉的比表面积、活性等级、掺量对混凝土强度和微观形貌的影响,得出相关结论如下:(1)矿渣微粉-水泥复合胶凝材料中矿渣微粉活性等级对混凝土强度的影响最大,其次是掺量,再次是比表面积;(2)矿渣微粉-水泥复合胶凝材料高强度的条件是等级为S105、掺量为30%、比表面积为450 m^(2)/kg;宏微观结果表明:龄期7、28 d时矿渣微粉-水泥复合胶凝材料硬化浆体的水化结晶相较空白组增多,且排列紧密,结构整体较纯空白组更加致密。综合上述矿渣微粉的作用机理及其生产工艺要求,提出工程应用矿渣微粉的条件为活性等级S95,掺量为30%左右,比表面积为400 m^(2)/kg。
To explore the action mechanism of slag powder in concrete,it based on three factors and three levels orthogonal test,combined with macro-performance test and micro-structure analysis,through studying the influence of specific surface area,active grade and content of slag powder on concrete strength and micro-morphology,the relevant conclusions were as follows(1)Active grade of slag powder in slag powder-cement composite cementitious material has the greatest influence on the strength of concrete,followed by dosage and again specific surface area.(2)The high strength condition of slag powder-cement composite cementitious material is grade S105,specific surface area is 450 m^(2)/kg,and the dosage is 30%.The macroscopic and microscopic results show that the hydration crystals of the hardened slurry of slag powder-cement composite cementitious material increase compared with the blank group on 7 d and 28 d,and the structure is more compact than that of the pure blank group.Based on the action mechanism of the slag powder and its production process requirements,the conditions for the application of slag powder in engineering application is active grade S95,the dosage is about 30%,and the specific surface area is 400 m^(2)/kg.
作者
杜兴亮
DU Xingliang(School of Engineering Economics,Henan University of Finance and Economics,Zhengzhou,Henan 451464,China)
出处
《混凝土》
CAS
北大核心
2022年第8期87-91,共5页
Concrete
关键词
矿渣微粉
正交试验
微观形貌
slag powder
orthogonal test
microscopic morphology
