[1]李向南,冯振刚*,纪鸿儒,等.路桥结构用复掺乳胶粉改性高韧性混凝土性能与改性机理[J].长安大学学报(自然科学版),2026,46(01):78-89.[doi:10.19721/j.cnki.1671-8879.2026.01.006]
　LI Xiang-nan,FENG Zhen-gang*,JI Hong-ru,et al.Properties and modification mechanism of high toughness concrete modified with compound latex powder[J].Journal of Chang’an University (Natural Science Edition),2026,46(01):78-89.[doi:10.19721/j.cnki.1671-8879.2026.01.006]
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路桥结构用复掺乳胶粉改性高韧性混凝土性能与改性机理()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第46卷
期数:
2026年01期
页码:
78-89
栏目:
道路工程
出版日期:
2026-01-31

文章信息/Info

Title:
Properties and modification mechanism of high toughness concrete modified with compound latex powder
文章编号:
1671-8879(2026)01-0078-12
作者:
李向南1; 冯振刚1*; 纪鸿儒2; 姚冬冬3; 崔奇1; 李新军1
(1. 长安大学 公路学院,陕西 西安 710064; 2. 广州市交通运输局,广东 广州 510630; 3. 吉林省交通科学研究所,吉林 长春 130012)
Author(s):
LI Xiang-nan1;  FENG Zhen-gang1*;  JI Hong-ru2;  YAO Dong-dong3;  CUI Qi1;  LI Xin-jun1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Guangzhou Municipal Transportation Bureau, Guangzhou 510630, Guangdong, China; 3. Jilin Provincial Transport Science Research Institute, Changchun 130012, Jilin, China)
关键词:
道路工程;  高韧性混凝土;  试验研究;  乳胶粉;  韧性;  抗冻性能;  改性机理
Keywords:
road engineering;  high toughness concrete;  experimental research;  latex powder;  toughness;  frost resistance;  modification mechanism
分类号:
U414
DOI:
10.19721/j.cnki.1671-8879.2026.01.006
文献标志码:
A
摘要:
为协同提升高韧性混凝土(HTC)的韧性及其在季冻区服役的耐久性,采用乙烯-醋酸乙烯酯(EVA)乳胶粉分别与丁苯(SB)乳胶粉和苯乙烯-丙烯酸酯(SA)乳胶粉复掺,成型不同复掺比例的改性HTC试件,通过强度、折压比评价HTC的力学性能及韧性,通过冻融及盐离子冻融循环试验对HTC耐久性进行评价,利用扫描电镜及孔结构试验对复掺乳胶粉改性HTC的微观结构及改性机理进行研究。研究结果表明:与EVA改性HTC(HTC1)相比,EVA/SB改性HTC(HTC2)和EVA/SA改性HTC(HTC3)的抗折强度和韧性均有显著提高; EVA/SB与EVA/SA均可以提高HTC的抗冻和抗盐冻性能,EVA/SA对HTC抗冻和抗盐冻性能的提升作用更显著; 相较于HTC1,HTC2、HTC3的界面过渡区黏结更为紧密且内部孔洞较少,结构更加致密; HTC2、HTC3孔隙率更低,孔结构分布更为合理,EVA/SA相较于EVA/SB对HTC孔结构改善更为显著,这可归因于复掺乳胶粉能够在HTC内部聚合成膜,与水泥水化产物共同形成网状结构,同时乳胶粉及其膜结构填充了孔隙,使得HTC的界面过渡区及孔结构得到了改善; 研究结果为季冻区高韧性混凝土的耐久性设计与性能优化提供了理论依据与可行路径,对提升寒区工程结构的服役安全与使用寿命具有积极意义。
Abstract:
To synergistically enhance the toughness of high toughness concrete(HTC)and its durability during service in seasonal freezing region, the HTC specimens with different compounding ratios were modified by ethylene-vinyl acetate(EVA)latex powder compounded with styrene butadiene(SB)latex powder and styrene acrylate(SA)latex powder, respectively. The mechanical properties and toughness of HTC were evaluated by strength and flexural compression ratio. The durability of HTC was evaluated by freeze-thaw test and salt ion freeze-thaw cycling test. The microstructure and modification mechanism of HTC modified by compound latex powder were investigated by scanning electron microscopy and mercury intrusion porosimetry test. The results show that, compared to EVA-modified HTC(HTC1), both EVA/SB-modified HTC(HTC2)and EVA/SA-modified HTC(HTC3)show significant improvement in flexural strength and toughness. EVA/SB and EVA/SA can both enhance the frost and salt-freeze resistance of HTC, but EVA/SA improvement is more significant. Compared to HTC1, the interface transition zones in HTC2 and HTC3 are more tightly bonded with fewer internal voids, resulting in a denser structure. The porosity of HTC2 and HTC3 was lower, and the pore structure distribution was more reasonable. EVA/SA show a more significant improvement in the pore structure of HTC compared to EVA/SB, which can be attributed to the ability of compounded latex powder to polymerize into a membrane within HTC, forming a network structure with the hydration products of cement. At the same time, the latex powders and their membrane structures fill the pores, improving the interface transition zone and pore structure of HTC. The findings provide theoretical guidance and feasible pathways for the durability design and performance optimization of high toughness concrete in seasonal freeze-thaw regions, positively contributing to the service safety and lifespan of engineering structures in cold regions.10 tabs, 8 figs, 32 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-06-01
基金项目:陕西省自然科学基础研究计划项目(2024JC-YBMS-306); 吉林省交通运输创新发展支撑(科技)项目(2021-1-6)
作者简介:李向南(1995-),男,河南洛阳人,工学博士研究生,从事高性能混凝土的力学与耐久性研究,E-mail:lixiangnan@chd.edu.cn。
通信作者:冯振刚(1986-),男,河南三门峡人,副教授,工学博士,E-mail:zgfeng@chd.edu.cn。
更新日期/Last Update: 2026-02-20