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<p>Improving the durability of high-toughness concrete (HTC) and clarifying its enhancement mechanism are essential for promoting its application under extreme conditions. In this study, styrene-acrylic (SA) latex powder at different dosages was used to modify HTC. Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were employed to characterize the microstructure and pore structure of HTC. The flowability, compressive strength and flexural strength were tested. The toughness of HTC was evaluated by three-point bending tests, and the crack propagation was monitored by digital image correlation (DIC) technique. The freeze–thaw test, salt freeze–thaw test, drying shrinkage test, rapid chloride migration (RCM) test, and carbonation test were conducted. The modification mechanism of SA latex powder on the HTC was discussed. Results show that the film structure flocculated by SA latex powder can fill the gaps and pores, enhance the interface bonding, and combine with hydration products to form a network structure, which significantly improve the pore structure, integrity and compactness of HTC. The SA latex powder has obvious improvement on the flexural strength and toughness of HTC. When the SA content is 1–1.5%, the mechanical strength and toughness of HTC have the most significant improvement. Considering the durability and mechanical properties, the optimal content of SA latex powder in the HTC is recommended to be 1.5–2% by weight of cementitious material. Combined with the excellent corrosion resistance of SA itself, the corrosive substance can be effectively prevented from encroaching into the HTC matrix, thus enhancing the durability of HTC.</p>

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Effect of styrene acrylic latex powder on microstructure, mechanical properties, and durability of steel fiber-reinforced high-toughness concrete

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Xiangnan Li,
  • Zhen-gang Feng,
  • Qi Cui,
  • Dongdong Yao,
  • Zhuang Wang,
  • Zhe Lu,
  • Yilong Cuan,
  • Xinjun Li

摘要

Improving the durability of high-toughness concrete (HTC) and clarifying its enhancement mechanism are essential for promoting its application under extreme conditions. In this study, styrene-acrylic (SA) latex powder at different dosages was used to modify HTC. Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were employed to characterize the microstructure and pore structure of HTC. The flowability, compressive strength and flexural strength were tested. The toughness of HTC was evaluated by three-point bending tests, and the crack propagation was monitored by digital image correlation (DIC) technique. The freeze–thaw test, salt freeze–thaw test, drying shrinkage test, rapid chloride migration (RCM) test, and carbonation test were conducted. The modification mechanism of SA latex powder on the HTC was discussed. Results show that the film structure flocculated by SA latex powder can fill the gaps and pores, enhance the interface bonding, and combine with hydration products to form a network structure, which significantly improve the pore structure, integrity and compactness of HTC. The SA latex powder has obvious improvement on the flexural strength and toughness of HTC. When the SA content is 1–1.5%, the mechanical strength and toughness of HTC have the most significant improvement. Considering the durability and mechanical properties, the optimal content of SA latex powder in the HTC is recommended to be 1.5–2% by weight of cementitious material. Combined with the excellent corrosion resistance of SA itself, the corrosive substance can be effectively prevented from encroaching into the HTC matrix, thus enhancing the durability of HTC.