纤维素醚对衬砌混凝土力学与工作性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0968

摘要/Abstract

摘要：

本文研究了羟丙基甲基纤维素醚（简称纤维素醚）在大流态衬砌混凝土中的适用性，评估其对混凝土新拌性能、流变特性及抗压强度的影响，并借助TGA-DTG、SEM和纳米压痕等手段揭示其微观作用机制。结果表明，纤维素醚的增稠效应导致衬砌混凝土的坍落度和扩展度有所降低，但有效抑制了衬砌混凝土的经时损失，当纤维素醚掺量为0.12%（质量分数）时，坍落度和扩展度的经时损失分别减少75.0%和66.7%，衬砌混凝土的抗离析性能得到提高。纤维素醚提升了衬砌混凝土的抗流动性，使其更难以发生剪切变形，表现出更强的触变性和保水能力。纤维素醚的掺入对衬砌混凝土抗压强度具有积极影响，添加0.03%~0.12%的纤维素醚可使衬砌混凝土28 d抗压强度提高7.6%~23.6%。此外，纤维素醚使水泥的水化程度提高，水化产物含量有所增加，样品表面的微观结构更加致密，低密度和高密度水化硅酸钙（C-S-H）凝胶的含量也有所提高，因此，衬砌混凝土的综合性能提升。

关键词: 衬砌混凝土, 羟丙基甲基纤维素醚, 新拌性能, 流变性能, 抗压强度

Abstract:

In this paper， the applicability of hydroxypropyl methyl cellulose ether （abbreviated as cellulose ether ） in large-flow lining concrete was studied， and its influence on the fresh mixing properties， rheological properties and compressive strength of concrete was evaluated. The microscopic mechanism was revealed by means of TGA-DTG， SEM and nanoindentation. The results show that the thickening effect of cellulose ether leads to the decrease of slump and expansion of lining concrete， but effectively inhibits the time loss of lining concrete. The time loss of slump and expansion can be reduced by 75.0% and 66.7% respectively when the cellulose ether content is 0.12% （mass fraction）， and the anti-segregation performance of lining concrete is improved. Cellulosic ether improves the anti-flowability of lining concrete， makes it more difficult to shear deformation， and shows stronger thixotropy and water retention capacity. The incorporation of cellulose ether has a positive effect on the compressive strength of lining concrete. The addition of 0.03%~0.12% cellulose ether can increase the 28 d compressive strength of lining concrete by 7.6%~23.6%. In addition， cellulose ether improves the hydration degree of cement， increases the content of hydration products， makes the microstructure of the sample surface denser， and increases the content of low density and high density calcium silicate hydrate （C-S-H） gel. Therefore， the comprehensive performance of lining concrete is improved.

Key words: lining concrete, hydroxypropyl methyl cellulose ether, fresh mixing property, rheological property, compressive strength

中图分类号:

TU528

王解放, 许德金, 李胜, 任万里, 陈佩圆. 纤维素醚对衬砌混凝土力学与工作性能的影响[J]. 硅酸盐通报, 2026, 45(4): 1175-1183.

WANG Jiefang, XU Dejin, LI Sheng, REN Wanli, CHEN Peiyuan. Influence of Cellulose Ether on Mechanical and Workability Properties of Lining Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(4): 1175-1183.

图/表 10

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Material	Mass fraction/%
Material	SiO₂	CaO	Fe₂O₃	Al₂O₃	MgO	K₂O	SO₃	Other
Cement	25.22	53.21	4.03	5.61	3.84	0.80	0.81	6.48
Fly ash	59.34	3.36	3.81	25.17	1.12	1.11	2.01	4.08
Expansive agent	26.83	27.21	2.80	22.03	1.35	0.75	17.25	1.78

Material	Mass fraction/%
Material	SiO₂	CaO	Fe₂O₃	Al₂O₃	MgO	K₂O	SO₃	Other
Cement	25.22	53.21	4.03	5.61	3.84	0.80	0.81	6.48
Fly ash	59.34	3.36	3.81	25.17	1.12	1.11	2.01	4.08
Expansive agent	26.83	27.21	2.80	22.03	1.35	0.75	17.25	1.78

Sample No.	Mix proportion/（kg·m^-3）
Sample No.	Water	Cement	Fly ash	Sand	5~<10 mm stone	10~20 mm stone	Expansive agent	HPMC	Water-reducing agent	Air-entraining agent
CC0	166	332	83	764	423	631	33	0	4.03	0.13
CC1	166	332	83	764	423	631	33	0.13	4.03	0.13
CC2	166	332	83	764	423	631	33	0.22	4.03	0.13
CC3	166	332	83	764	423	631	33	0.31	4.03	0.13
CC4	166	332	83	764	423	631	33	0.40	4.03	0.13
CC5	166	332	83	764	423	631	33	0.49	4.03	0.13

Sample No.	Mix proportion/（kg·m^-3）
Sample No.	Water	Cement	Fly ash	Sand	5~<10 mm stone	10~20 mm stone	Expansive agent	HPMC	Water-reducing agent	Air-entraining agent
CC0	166	332	83	764	423	631	33	0	4.03	0.13
CC1	166	332	83	764	423	631	33	0.13	4.03	0.13
CC2	166	332	83	764	423	631	33	0.22	4.03	0.13
CC3	166	332	83	764	423	631	33	0.31	4.03	0.13
CC4	166	332	83	764	423	631	33	0.40	4.03	0.13
CC5	166	332	83	764	423	631	33	0.49	4.03	0.13

Sample No.	Slump/mm	Flow/mm	Inverted slump cone emptying time/s	Slump after 1 h/mm	Flow after 1 h/mm
CC0	255	560	5.9	235	545
CC1	250	530	7.2	235	520
CC2	240	515	9.8	230	505
CC3	240	500	13.1	230	490
CC4	235	480	17.2	225	470
CC5	230	460	20.5	225	455