Microstructural feature of cellulose fibre in cement-based composites at different curing temperature

被引：9

作者：

Liu, Kaiqiang ^{[1
,2
,3
]}

Wen, Zhaijun ^{[1
]}

Zheng, Youzhi ^{[4
]}

Xu, Yigang ^{[2
]}

Yu, Junjie ^{[3
]}

Ye, Jiayuan ^{[1
]}

Zhang, Wensheng ^{[1
]}

Zhong, Wen ^{[2
]}

Gao, Xianshu ^{[1
]}

Liu, Huan ^{[2
]}

机构：

[1] China Bldg Mat Acad, Beijing 100024, Peoples R China

[2] Jiahua Special Cement Co Ltd, Leshan 614000, Peoples R China

[3] Southwest Petr Univ, Sch New Energy & Mat, Chengdu 610500, Peoples R China

[4] PetroChina Southwest Oil & Gas Field Co, Engn Technol Res Inst, Guanghan 618300, Sichuan, Peoples R China

来源：

JOURNAL OF BUILDING ENGINEERING | 2023年 / 63卷

关键词：

Cement-based composites; Cellulose fibre; Temperature adaptability; Microstructure; Reinforcement; OIL; DEGRADATION; DURABILITY; MECHANISMS; BEHAVIOR; MATRIX;

D O I：

10.1016/j.jobe.2022.105569

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Thermal stability, chemical structure and microstructure of cellulose fibre under cement paste and dry conditions at different temperature were tested to investigate its temperature adaptability in cement-based composites. Results demonstrated that after curing for 60 days at 60 and 90 degrees C, the compressive strength of cement paste containing 0.4 wt% cellulose fibre increased 16.16% and 22.79%, respectively. However, the compressive strength of the paste curing at 120 and 150 degrees C had no enhancement effect. Compared with the dry condition, cement paste filtrate had a significant influence on chemical structure and microstructure at 120 and 150 degrees C. In filtrate cured at 120 degrees C, beta-1,4-polyglucose in cellulose fibre underwent alkaline hydrolysis, fragmenting cel-lulose fibre to smaller pieces, which converted the "fibrous structure" to "cluster structure". However, in filtrate cured at 150 degrees C, reducing end group in cellulose fibre underwent peeling reaction, which decreased its thermal stability and changed its crystallinity from 0.69 to 0, whereby microstructure transformed into "agglomeration structure".

引用

页数：20

共 54 条

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