Kim Yong Jic, Choi Sung, Oh Sung Rok
Division of Smart Construction and Environmental Engineering, Daejin University, Pocheon 11159, Republic of Korea.
Department of Civil Engineering, Kyungdong University, Yangju 11458, Republic of Korea.
Materials (Basel). 2024 Oct 10;17(20):4951. doi: 10.3390/ma17204951.
This study aims to investigate the comparative performance of ester- and ether-based polycarboxylate superplasticizers in maintaining the fluidity and controlling the setting time of alkali-activated slag (AAS) paste. The experiments employed rheological tests, mini-slump tests, ultrasonic pulse velocity (UPV) measurements, and gel permeation chromatography (GPC) analysis. The results indicate that ether-based superplasticizers maintain fluidity approximately 25% longer than their ester-based counterparts and extend the setting time by about 30%. The enhanced performance of ether-based superplasticizers is attributed to their superior molecular stability in highly alkaline environments, which mitigates early polymer degradation. Additionally, the NaO/SiO ratio was maintained at 1:1 throughout the experiments to ensure consistency in the activation process. The relationship between fluidity loss and the onset of setting occurs more rapidly in AAS paste than in conventional cement-based systems. These findings provide valuable insights for the development of environmentally friendly construction materials by optimizing the use of superplasticizers in alkali-activated systems.
本研究旨在探究酯基和醚基聚羧酸系高效减水剂在保持碱激发矿渣（AAS）浆体流动性及控制其凝结时间方面的对比性能。实验采用了流变测试、迷你坍落度测试、超声波脉冲速度（UPV）测量以及凝胶渗透色谱（GPC）分析。结果表明，醚基高效减水剂保持流动性的时间比酯基高效减水剂长约25%，且凝结时间延长约30%。醚基高效减水剂性能的提升归因于其在高碱性环境中具有优异的分子稳定性，这减轻了聚合物的早期降解。此外，在整个实验过程中，NaO/SiO比保持在1:1，以确保活化过程的一致性。与传统水泥基体系相比，AAS浆体中流动性损失与凝结开始之间的关系出现得更快。这些发现通过优化碱激发体系中高效减水剂的使用，为环保建筑材料的开发提供了有价值的见解。
