超细粉煤灰对衬砌混凝土强度与变形性能的影响  

The Influence of Ultra-fine Fly Ash on the Strength and Deformation Performance of Lining Concrete

作　　者：梅杨[1] MEI Yang(Department of Civil Engineering/Henan Technical College of Construction,Zhengzhou 450064,China)

机构地区：[1]河南建筑职业技术学院土木工程系,河南郑州450064

出　　处：《山东农业大学学报（自然科学版）》2020年第1期73-77,共5页Journal of Shandong Agricultural University：Natural Science Edition

摘　　要：为研究超细粉煤灰对衬砌混凝土材料的强度和变形性能的影响规律及微观改性机制,本文采用5种掺量超细粉煤灰制备胶结混凝土,进行抗压强度试验和电子显微镜扫描试验。结果表明:混凝土立方体的抗压强度随粉煤灰含量增加呈先增后减的趋势,15%超细粉煤灰掺量的混凝土强度性能最佳;掺入超细粉煤灰也可以提高试样抵抗变形的能力,压缩破坏时的最终应变εult在粉煤灰掺入后大幅下降;从电子显微镜扫描结果发现经过粉煤灰改性的试件内部结构有显著改变,粉煤灰细颗粒对混凝土内部孔隙具有填充效应;但超细粉煤灰过大时,水泥含量相对减少反而导致骨料之间的粘结减弱。In order to study the influence of fly ash on the strength performance of coal lining concrete and its modification mechanism, the compressive strength of five kinds of ultra-fine fly ash cemented filling samples was tested and the microstructure was analyzed by scanning electron microscope. The results show that the compressive strength of the composite cemented filling material increases first and then decreases with the increase of ultra-fine content, and the strength performance of the specimens is the best when 15% ultra-fine content is added, and the deformation resistance of the specimens can be improved by adding fly ash, and the ultimate strain of the specimens decreases sharply with the increase of fly ash content. The internal structure of the specimens modified by fly ash has a significant change. The fine particles of fly ash have a filling effect on the internal pores of the filling body. A certain amount of fly ash is beneficial to the improvement of strength and deformation ability. However, the bond between aggregates is weakened with the increase of fly ash content.

关 键 词：衬砌混凝土 粉煤灰 强度试验 变形性能 

分 类 号：TB44[一般工业技术]