摘要
采用裹浆工艺对煤矸石骨料进行预处理,研究原状煤矸石骨料与不同浆体裹浆煤矸石骨料的吸水率、压碎值和干湿、冻融环境下的劣化行为以及裹浆煤矸石混凝土的强度和耐久性能,并分析骨料性能强化与混凝土性能提升的相关性。采用XRD、SEM分析原状煤矸石骨料与裹浆煤矸石骨料干湿、冻融循环前后的矿物组成、微观形貌和界面过渡区。结果表明,原状煤矸石骨料吸水率高,硬度低,在干湿、冻融环境下劣化明显,裹浆后煤矸石骨料性能提升。原状煤矸石混凝土强度与耐久性能较差,裹浆后煤矸石混凝土性能得到增强,骨料性能与混凝土性能相关性良好。煤矸石骨料劣化的主要原因是黏土矿物吸水后在干湿、冻融环境下软化失稳,而裹浆可以起到隔绝水分的作用,从而使骨料性能得到强化。骨料强化以及骨料与砂浆基体的结合程度提高共同促进了裹浆煤矸石混凝土性能提升。
The coal gangue aggregate was pretreated by slurry wrapping technology. The water absorption, crushing value and deterioration behavior under dry-wet and freeze-thaw environment of original coal gangue aggregate and different slurry wrapped coal gangue aggregates were studied. The strength and durability of slurry wrapped coal gangue concrete were tested and the correlation between aggregate performance enhancement and concrete performance improvement was analyzed. XRD and SEM were used to analyze the mineral composition, microstructure and interfacial transition zone of original coal gangue aggregate and slurry wrapped coal gangue aggregate before and after dry-wet and freeze-thaw cycle. The results show that the original coal gangue aggregate has high water absorption, low hardness and obvious deterioration in dry-wet and freeze-thaw environment, while the performance of coal gangue aggregate is improved after slurry wrapping. The strength and durability of original coal gangue concrete are poor, while the performance of coal gangue concrete is enhanced after slurry wrapping. The correlation between the performance of aggregate and concrete is good. The main reason for the deterioration of coal gangue aggregate is that clay minerals soften and destabilize under dry-wet and freeze-thaw environment after absorbing water, but the wrapping slurry can isolate water, thus strengthening the performance of aggregate. Aggregate strengthening and the improvement of the bonding degree between aggregate and mortar matrix jointly promote the performance improvement of slurry wrapped coal gangue concrete.
作者
姚志鑫
穆川川
单俊鸿
刘捷
王奎
高鹏
YAO Zhixin;MU Chuanchuan;SHAN Junhong;LIU Jie;WANG Kui;GAO Peng(School of Civil Engineering,Hebei University of Engineering,Handan 056000,China;Shanxi Road and Bridge Group Xinzhou National Road Project Construction Management Co.,Ltd.,Xinzhou 034000,China;Shanxi Zhuoyue Cement Co.,Ltd.,Changzhi 046000,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第2期587-597,共11页
Bulletin of the Chinese Ceramic Society
关键词
混凝土
煤矸石骨料
裹浆工艺
干湿循环
冻融循环
强度
耐久性能
concrete
coal gangue aggregate
slurry wrapping technology
dry-wet cycle
freeze-thaw cycle
strength
durability
