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<p>This study explores the impact of anhydrous sodium acetate (ASAc), used here as an internal admixture, on the mechanical and fracture behavior of concrete. Mixes containing 0%, 2%, and 4% ASAc by weight of cement were prepared at water-to-cement (w/c) ratios of 0.3, 0.4, and 0.5. Compressive strength, splitting tensile strength, and modulus of elasticity were measured at 7, 28, and 90 days. Fracture energy (G<sub>F</sub>) and characteristic length (L<sub>ch</sub>), two key fracture parameters, were assessed using the work of fracture method (WFM) at 28 days for all mixes and additionally at 90 days for the mix with w/c = 0.3. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were conducted to qualitatively examine microstructural changes. Results showed that at w/c = 0.3, ASAc improved mechanical properties at 28 and 90 days, particularly at 4% dosage. In this case, G<sub>F</sub> increased while L<sub>ch</sub> decreased with increasing ASAc content. In contrast, at higher w/c ratios (0.4 and 0.5), ASAc generally reduced mechanical strength and fracture resistance, especially at higher dosages, over the curing durations studied.</p>

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Mechanical Properties, Fracture Energy, and Brittleness of Concrete Containing Sodium Acetate at Different Water-to-Cement Ratios and Curing Ages

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Majid Latifi Shahandashti,
  • N. Fallah

摘要

This study explores the impact of anhydrous sodium acetate (ASAc), used here as an internal admixture, on the mechanical and fracture behavior of concrete. Mixes containing 0%, 2%, and 4% ASAc by weight of cement were prepared at water-to-cement (w/c) ratios of 0.3, 0.4, and 0.5. Compressive strength, splitting tensile strength, and modulus of elasticity were measured at 7, 28, and 90 days. Fracture energy (GF) and characteristic length (Lch), two key fracture parameters, were assessed using the work of fracture method (WFM) at 28 days for all mixes and additionally at 90 days for the mix with w/c = 0.3. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were conducted to qualitatively examine microstructural changes. Results showed that at w/c = 0.3, ASAc improved mechanical properties at 28 and 90 days, particularly at 4% dosage. In this case, GF increased while Lch decreased with increasing ASAc content. In contrast, at higher w/c ratios (0.4 and 0.5), ASAc generally reduced mechanical strength and fracture resistance, especially at higher dosages, over the curing durations studied.