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Pore structure evaluation of cementing composites blended with coal by-products: Calcined coal gangue and coal fly ash
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.fuproc.2018.09.013 Jin Yang , Ying Su , Xingyang He , Hongbo Tan , Youzhi Jiang , Linghao Zeng , Bohumír Strnadel
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.fuproc.2018.09.013 Jin Yang , Ying Su , Xingyang He , Hongbo Tan , Youzhi Jiang , Linghao Zeng , Bohumír Strnadel
Abstract Coal gangue (CG) and coal fly ash (FA) are the main coal by-product wastes. This paper focuses on the pore structure evaluation of CG and FA blended cementing composites with various replacement levels from 3 days up to 180 days. Results indicate that negative effect of coal by-products on the compressive strength and average pore size can be reduced to a negligible level at late ages. Similar average pore size (~10 nm) and critical width (10–20 nm) are found for CG and FA composites after 90 days. Moreover, the blended composites have significantly higher gel pore fraction, and the higher the dosage the larger the gel pore fraction. Multi-fractal feature is observed with the fact that scale of micro-fractal region is found always broader than the macro-fractal region and the micro-Ds is found always larger than the macro-Ds. Both the micro- and macro-Ds of blended composites are systematically larger than the plain pastes.
中文翻译:
掺混煤副产品的水泥复合材料孔隙结构评价:煅烧煤矸石和粉煤灰
摘要 煤矸石(CG)和粉煤灰(FA)是主要的煤炭副产品废物。本文重点研究了从 3 天到 180 天不同置换水平的 CG 和 FA 混合胶结复合材料的孔隙结构评价。结果表明,煤副产品对抗压强度和平均孔径的负面影响在后期可以降低到可以忽略不计的水平。90 天后,CG 和 FA 复合材料的平均孔径 (~10 nm) 和临界宽度 (10-20 nm) 相似。此外,共混复合材料具有显着更高的凝胶孔率,并且剂量越高,凝胶孔率越大。观察到多重分形特征的事实是,发现微分形区域的尺度总是比宏观分形区域更宽,并且发现微观 Ds 总是大于宏观 Ds。
更新日期:2018-12-01
中文翻译:
掺混煤副产品的水泥复合材料孔隙结构评价:煅烧煤矸石和粉煤灰
摘要 煤矸石(CG)和粉煤灰(FA)是主要的煤炭副产品废物。本文重点研究了从 3 天到 180 天不同置换水平的 CG 和 FA 混合胶结复合材料的孔隙结构评价。结果表明,煤副产品对抗压强度和平均孔径的负面影响在后期可以降低到可以忽略不计的水平。90 天后,CG 和 FA 复合材料的平均孔径 (~10 nm) 和临界宽度 (10-20 nm) 相似。此外,共混复合材料具有显着更高的凝胶孔率,并且剂量越高,凝胶孔率越大。观察到多重分形特征的事实是,发现微分形区域的尺度总是比宏观分形区域更宽,并且发现微观 Ds 总是大于宏观 Ds。