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<p>Based on the problem of slow early strength development of low-heat Portland cement (LHPC), the effects of various dosages (especially ultra-low dose) of diethanol-isopropanolamine (DEIPA) on the hydration and mechanical properties of LHPC were investigated in this study. Results showed that the effect of DEIPA dosage on strength exhibited a nonlinear relationship, specifically manifested as: trace DEIPA (0.0075%) enhanced the compressive strength of LHPC at all selected age before 28d, specially, increased the 3d compressive strength by 10.5% with increasing in heat releases by 2%. Conversely, higher DEIPA additions (0.03–0.09%) reduced the early compressive strength but significantly increased strength by 9.8–13.1% at 28d. Trace DEIPA accelerated ferrite (C<sub>4</sub>AF) hydration and enhanced the kinetic for silicate hydrates growth, thus improving the early hydration of the LHPC to enhance the compressive strength. However, higher DEIPA additions initially impended early strength development, possibly due to increased supersaturation indices required for C-S–H and CH nucleation, while the improvement of 28d strength was attributed to DEIPA promoting the continuous hydration of C<sub>4</sub>AF and potentially further accelerating the hydration of silicate phases (C<sub>3</sub>S and C<sub>2</sub>S. Correlations of compressive strength with the LHPC hydration process and pore structures were also established. Furthermore, DEIPA triggered the conversion of ettringite (AFt) to monosulfate (AFm) and likely promoted the amorphous CH formation, which also affect the strength development of the LHPC. These findings offer valuable theoretical insights for regulating the strength development of LHPC.</p>

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Dosage-dependent effects of DElPA on hydration and strength development of low-heat Portland cement

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Hui Liu,
  • Hao Wan,
  • Min Wang,
  • Wen Huang,
  • Jianfeng Wang,
  • Suping Cui

摘要

Based on the problem of slow early strength development of low-heat Portland cement (LHPC), the effects of various dosages (especially ultra-low dose) of diethanol-isopropanolamine (DEIPA) on the hydration and mechanical properties of LHPC were investigated in this study. Results showed that the effect of DEIPA dosage on strength exhibited a nonlinear relationship, specifically manifested as: trace DEIPA (0.0075%) enhanced the compressive strength of LHPC at all selected age before 28d, specially, increased the 3d compressive strength by 10.5% with increasing in heat releases by 2%. Conversely, higher DEIPA additions (0.03–0.09%) reduced the early compressive strength but significantly increased strength by 9.8–13.1% at 28d. Trace DEIPA accelerated ferrite (C4AF) hydration and enhanced the kinetic for silicate hydrates growth, thus improving the early hydration of the LHPC to enhance the compressive strength. However, higher DEIPA additions initially impended early strength development, possibly due to increased supersaturation indices required for C-S–H and CH nucleation, while the improvement of 28d strength was attributed to DEIPA promoting the continuous hydration of C4AF and potentially further accelerating the hydration of silicate phases (C3S and C2S. Correlations of compressive strength with the LHPC hydration process and pore structures were also established. Furthermore, DEIPA triggered the conversion of ettringite (AFt) to monosulfate (AFm) and likely promoted the amorphous CH formation, which also affect the strength development of the LHPC. These findings offer valuable theoretical insights for regulating the strength development of LHPC.