|Table of Contents|

Properties and modification mechanism of high toughness concrete modified with compound latex powder(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2026年01期
Page:
78-89
Research Field:
道路工程
Publishing date:

Info

Title:
Properties and modification mechanism of high toughness concrete modified with compound latex powder
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)
Keywords:
road engineering;  high toughness concrete;  experimental research;  latex powder;  toughness;  frost resistance;  modification mechanism
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2026.01.006
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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Last Update: 2026-02-20