纤维增强混凝土在复合盐半浸泡环境下的劣化性能

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (5): 21-28.

纤维增强混凝土在复合盐半浸泡环境下的劣化性能

汪镇^*, 王磊, 赵刚

中交一公局第五工程有限公司, 北京 100024

收稿日期:2024-09-13 出版日期:2025-10-28 发布日期:2025-10-25
通讯作者: 汪镇(1983-),男,湖南长沙人,高级工程师. Email:158662562@qq.com

Study on the deterioration performance of fiber-reinforced concrete in composite salt partial soaking environment

WANG Zhen, WANG Lei, ZHAO Gang

Fifth Engineering Co. Ltd., China Communications First Highway Engineering Co. Ltd., Beijing 100024, China

Received:2024-09-13 Online:2025-10-28 Published:2025-10-25

摘要/Abstract

摘要： 以3.5%NaCl+5%Na₂SO₄复合溶液为侵蚀介质,开展纤维增强混凝土(FRC)性能劣化研究,设计了6组FRC试件,以外观形貌、侵蚀高度、质量损失率、相对动弹性模量和抗压强度为测试指标,研究钢纤维(SF)和聚丙烯纤维(PF)单掺或混杂对混凝土抗复合盐半浸泡侵蚀性能的影响.结果表明:单掺PF或混杂SF-PF均降低了溶液的侵蚀高度,而掺加1%的SF增加了试件表面的盐结晶量和侵蚀高度.FRC的质量损失率随侵蚀龄期的增加呈先降低后增大的变化规律,而相对动弹性模量和相对抗压强度则呈相反的规律,掺加1%SF的试件抗压强度降低幅度最小.通过热重分析结果可知,液面上部气液区混凝土内生成的腐蚀产物主要是AFt和Friedel’s,掺入SF和PF对Ca(OH)₂含量的降低有抑制作用.

关键词: 半浸泡, 复合盐侵蚀, 灯芯作用, 纤维增强混凝土, 性能退化

Abstract: The durability of fiber reinforced concrete (FRC) was studied with 3.5%NaCl+5%Na₂SO₄ composite solution as the erosion medium. Six groups of FRC specimens were designed to study the influence of steel fiber (SF) and polypropylene fiber (PF) single or mixed on the performance of concrete against partial immersion erosion by composite salt, using appearance morphology, erosion height, mass loss rate, relative dynamic modulus of elasticity and relative compressive strength as test indexes. The results showed that single doping PF or hybrid SF-PF decrease the rise height of the solution, while the addition of 1% SF increase the salt crystallization on the surface of the specimen and solution rise height. The mass loss rate of FRC decrease first and then increase with the increase of erosion age, while the relative dynamic modulus of elasticity and relative compressive strength show the opposite pattern. The compressive strength of the specimens with 1% SF decrease the least. According to the results of thermogravimetric analysis, the corrosion products generated in the concrete in the gas-liquid zone above the liquid level are mainly AFt and Friedel’s, and the addition of SF and PF have an inhibitory effect on the reduction of Ca(OH)₂.

Key words: partial immersion, compound salt attack, wick action, fiber-reinforced concrete, performance degradation

中图分类号:

TU528.1

汪镇, 王磊, 赵刚. 纤维增强混凝土在复合盐半浸泡环境下的劣化性能[J]. 兰州理工大学学报, 2025, 51(5): 21-28.

WANG Zhen, WANG Lei, ZHAO Gang. Study on the deterioration performance of fiber-reinforced concrete in composite salt partial soaking environment[J]. Journal of Lanzhou University of Technology, 2025, 51(5): 21-28.

参考文献

[1] YU C,SUN W,SCRIVENER K.Degradation mechanism of slag blended mortars immersed in sodium sulfate solution [J].Cement & Concrete Research,2017,72:37-47.
[2] SAAVEDRA W G V,ANGULO D E,GUTIÉRREZ R M D.Fly ash slag geopolymer concrete:resistance to sodium and magnesium sulfate attack [J].Journal of Materials in Civil Engineering,2016,28(12):04016148.
[3] CRAMMOND N J.The thaumasite form of sulfate attack in the UK [J].Cement Concrete Composites,2003,25(8):809-818.
[4] BASSUONI M T,RAHMAN M M.Response of concrete to accelerated physical salt attack exposure [J].Cement & Concrete Research,2016,79:395-408.
[5] BUENFELD N R,Shurafa-Daoudi M T,Mloughlin I M.Chloride transport due to wick action in concrete [J].RILEM Int Workshop Chloride Penetration Concrete,1995,45:315-324.
[6] 李果,陈建壮,郭东芹.盐渍土环境掺粉煤灰、矿粉混凝土的硫酸盐腐蚀 [J].徐州工程学院学报(自然科学版),2015,30(3):70-75.
[7] 罗大明,周萌,李凡,等.“灯芯效应”下珊瑚骨料混凝土氯离子传输行为 [J].建筑材料学报,2023,26(11):1173-1182,1206.
[8] 刘赞群,周蕴婵,胡文龙,等.半浸泡硫铝酸盐水泥混凝土蒸发区孔结构变化 [J].材料导报,2023,37(3):21080270.
[9] WANG L C,ZHANG X,LI Z P,et al.The effect of pH and carbonation on the partially immersed mortar exposed to physical salt attack [J].Construction and Building Materials,2024,444,137862.
[10] 孙道胜,王辉,刘开伟,等.低湿度半浸泡环境下粉煤灰对砂浆试件硫酸盐侵蚀性能的影响 [J].材料导报,2020,34(7):14079-14086.
[11] AFROUGHSABET V,BIOLZI L,MONTEIRO P.The effect of steel and polypropylene fibers on the chloride diffusivity and drying shrinkage of high-strength concrete [J].Composites Part B:Engineering,2018,139:84-96.
[12] SOEYLEV T A,OEZTURAN T.Durability.physical and mechanical properties of fiber-reinforced concretes at low-volume fraction [J].Construction and Building Materials,2014,73:67-75.
[13] 王新科.西部环境下纤维混凝土耐侵蚀性研究 [D].兰州:兰州理工大学,2022.
[14] 刘广斌,常山.粉煤灰掺量对纤维混凝土抗硫酸盐侵蚀能力的影响 [J].粉煤灰综合利用,2022,36(4):64-68,97.
[15] 中华人民共和国住房和城乡建设部.混凝土物理力学性能试验方法标准:GB/T 50081—2019 [S].北京:中国建筑工业出版社,2019.
[16] GUO X L,HU W P,SHI H S,Microstructure and self-solidification/stabilization (S/S) of heavy metals of nano-modified CFA-MSWIFA composite geopolymers [J].Construction and Building Materials,2014,56:81-86.
[17] DESCHNER F,LOTHENBACH B,WINNEFELD F,et al.Effect of temperature on the hydration of Portland cement blended with siliceous fly ash [J].Cement & Concrete Research,2013,52:169-181.
[18] 马昆林,谢友均,龙广成,等.水泥基材料在硫酸盐结晶侵蚀下的劣化行为 [J].中南大学学报(自然科学版),2010,41(1):303-309.
[19] 张桂涛.半浸泡珊瑚骨料混凝土氯离子传输行为研究 [D].西安:西安建筑科技大学,2020.
[20] WANG Y,ZHANG S H,NIU D T,et al.Quantitative evaluation of the characteristics of air voids and their relationship with the permeability and salt freeze-thaw resistance of hybrid steel-polypropylene fiber-reinforced concrete composites [J].Cement and Concrete Composites,2022,125:104292.
[21] RASHID M U.Experimental investigation on durability characteristics of steel and polypropylene fiber reinforced concrete exposed to natural weathering action [J].Construction and Building Materials,2020,250:118910.
[22] 闫宏生.再生混凝土的硫酸盐腐蚀试验研究 [J].混凝土,2013(5):13-15.
[23] ESPINOSA R M,FRANKE L,DECKELMANN G.Phase changes of salts in porous materials:Crystallization,hydration and deliquescence [J].Construction and Building Materials,2008,22(8):1758-1773.
[24] LIANG N,MAO J,YAN R,et al.Corrosion resistance of multiscale polypropylene fiber-reinforced concrete under sulfate attack [J].Case Studies in Construction Materials,2022,16:e01065.
[25] MHEOA B,SHAS C,AA D,et al.Mechanical performance water and chloride permeability of hybrid steel-polypropylene fiber-reinforced recycled aggregate concrete [J].Case Studies in Construction Materials,2022,16:e00831
[26] YUE Y,WANG J J,BASHEER P A M,et al.Raman spectroscopic investigation of Friedel’s salt [J].Cement and Concrete Composites,2018,86:306-314.
[27] 王家滨,侯泽宇,张凯峰,等.再生混凝土高浓度$\mathrm{Mg}^{2+}-\mathrm{SO}_{4}^{2-}-\mathrm{Cl}^{-}$复合盐侵蚀耐久性 [J].材料导报,2022,36(23):21080171.