蒸养条件下超掺粉煤灰混凝土强度与机理研究  

Study on Strength and Mechanism of Super blended Fly Ash Concrete under Steam curing Conditions

作　　者：徐俊鹏 赵天奇 赵睿 韩春 梁鹏 赵辉川 张维国 XU Junpeng;ZHAO Tianqi;ZHAO Rui;HAN Chun;LIANG Peng;ZHAO Huichuan;ZHANG Weiguo(China MCC22 Group Co.,Ltd.,Tangshan 064000,China;School of Civil Engineering and Architecture,Wuyi University,Wuyishan 354300,China)

机构地区：[1]中国二十二冶集团有限公司,唐山064000 [2]武夷学院土木工程与建筑学院,武夷山354300

出　　处：《粉煤灰综合利用》2025年第1期49-54,共6页Fly Ash Comprehensive Utilization

摘　　要：为了对高温蒸养条件下的大掺量工业固废混凝土性能变化有进一步的了解,采用宏观试验、X射线衍射(XRD)、和扫描电子显微镜(SEM)相结合的方法对粉煤灰超量取代法制备的C30混凝土性能和增强机理进行了研究分析。结果表明:粉煤灰超量单掺时,在取代率为20%,超量系数为1.6时,脱模强度达到最大20.8 MPa,在取代率为25%,超量系数为1.4时,28 d强度达到最大42.8 MPa。在粉煤灰取代率和超量系数分别为25%和1.6,硅灰内掺5%时,双掺硅灰和粉煤灰的成本及强度等综合性能达到最佳,同时外加剂用量也仅为1.3%。在微观定性与定量分析中,双掺硅灰和粉煤灰的CH含量最少,胶凝性水化产物C-S-H的衍射强度最好,微观结构也更加致密。In order to further understand the performance changes of high content industrial solid waste concrete under high-temperature steam curing conditions.The study used a combination of macroscopic experiments,X-ray diffraction(XRD),and scanning electron microscopy(SEM)to investigate and analyze the properties and reinforcement mechanism of C30 concrete prepared by fly ash over substitution method.It was found that when fly ash was excessively added,the demolding strength reached a maximum of 20.8 MPa at a substitution rate of 20% and an excess coefficient of 1.6.At a substitution rate of 25% and an excess coefficient of 1.4,the maximum strength of 42.8 MPa was achieved at 28 days.When the substitution rate of fly ash is 25%,the excess coefficient is 1.6,and 5% of silica fume is added,the comprehensive performance of cost and strength of double blended silica fume and fly ash reaches the best,and the minimum amount of admixture is only 1.3%.In micro qualitative and quantitative analysis,the CH content of double doped silica fume and fly ash is the lowest,the diffraction intensity of cementitious hydration product C-S-H is the best,and the microstructure is also denser.

关 键 词：土木工程 高温蒸养 超量取代法 宏观力学 增强机理 

分 类 号：TU528.1[建筑科学—建筑技术科学]