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<p>To determine the impact of silicate modulus and silicate dosage on the workability, shrinkage behavior and microstructure, the flowability, setting time, compressive strength, autogenous shrinkage and drying shrinkage of alkali-activated fly ash/slag (AAFS) pastes were assessed. Results indicate that the low modulus and high dosage of silicate are conducive to the compressive strength development and mitigation of drying shrinkage, while the high-modulus and low-dosage silicate contributes to the better flowability and lower autogenous shrinkage. Under the environment of high alkalinity, the reaction process is accelerated and more reaction products are formed. Thus, the setting time of AAFS paste is shorten in low-modulus or high-dosage system. From the results of the microscopic analyses, the phase and chemical compositions of AAFS pastes are quite close. It is worth noting that the generation of more reaction products would contribute to the compactness of hardened AAFS pastes when the low-modulus or high-dosage silicate is used. This work is of great significance for the comprehensive understanding in the properties development of AAFS pastes with different moduli and dosage silicate.</p>

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Investigation on the workability, shrinkage behavior and microstructure of alkali-activated cements prepared by different silicate moduli and dosages

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Liang Tian,
  • Guangwei Liang,
  • Xiao Yao,
  • Qisheng Wu,
  • Huajun Zhu,
  • Zheyu Zhu,
  • Maolin Yang,
  • Bolin Shen,
  • Jiale Zhu

摘要

To determine the impact of silicate modulus and silicate dosage on the workability, shrinkage behavior and microstructure, the flowability, setting time, compressive strength, autogenous shrinkage and drying shrinkage of alkali-activated fly ash/slag (AAFS) pastes were assessed. Results indicate that the low modulus and high dosage of silicate are conducive to the compressive strength development and mitigation of drying shrinkage, while the high-modulus and low-dosage silicate contributes to the better flowability and lower autogenous shrinkage. Under the environment of high alkalinity, the reaction process is accelerated and more reaction products are formed. Thus, the setting time of AAFS paste is shorten in low-modulus or high-dosage system. From the results of the microscopic analyses, the phase and chemical compositions of AAFS pastes are quite close. It is worth noting that the generation of more reaction products would contribute to the compactness of hardened AAFS pastes when the low-modulus or high-dosage silicate is used. This work is of great significance for the comprehensive understanding in the properties development of AAFS pastes with different moduli and dosage silicate.