Na2C2O4 + Ca(OH)2活化地聚合物与Na2C2O4 + Ca(OH)2活化地聚合物抗CO2性能的比较分析

IF 4.3 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Omega Pub Date : 2025-04-24 DOI:10.1021/acsomega.4c1108210.1021/acsomega.4c11082

Shenglai Guo*, Rong Wang, Ye Zhang, Ruihua Zhang, Danzhu Zheng, Jie Ren, Yuanhai Zhang and Jiajun Tang,

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引用次数: 0

摘要

Na2C2O4和Ca(OH)2的组合作为一种环保型碱性活化剂，具有碱度低、碳足迹少、增稠行为可控的特点。草酸钙是Na2C2O4和Ca(OH)2反应的副产物，可以增强地聚合物的抗CO2能力。在本研究中，我们比较了Na2C2O4 + Ca(OH)2和NaOH活化的地聚合物在高温条件下（110℃，5 MPa CO2）的抗CO2性能。以粉煤灰沉降珠和矿渣为前驱体。记录了碱度和强度的变化趋势，并通过XRD、FTIR和DTG分析了微观组成的变化。结果表明：CO2作用21 d后，NaOH或Na2C2O4 + Ca(OH)2活化的地聚合物抗压强度提高了7.14% ~ 22.58%；值得注意的是，两种活化剂在CO2抗性方面没有显著差异。延长暴露前固化时间更有效地增强了地聚合物的抗CO2能力，固化7天的样品抗压强度比固化1天的样品高28.9-34.2%。傅里叶反褶积光谱分析表明，N-A-S-H凝胶比C-A-S-H凝胶具有更好的CO2抗性。

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Comparative Analysis of CO2 Resistance on NaOH-Activated and Na2C2O4 + Ca(OH)2-Activated Geopolymers

The combination of Na₂C₂O₄ and Ca(OH)₂ acts as an eco-friendly alkaline activator characterized by low alkalinity, reduced carbon footprint, and controllable thickening behavior. Calcium oxalate, a byproduct of the Na₂C₂O₄ and Ca(OH)₂ reaction, may enhance the CO₂ resistance of geopolymers. In this study, we compared the CO₂-resistant performance of geopolymers activated by Na₂C₂O₄ + Ca(OH)₂ and NaOH under high-temperature conditions (110 °C, 5 MPa CO₂). Fly ash sinking beads and slag were used as precursors. Trends in alkalinity and strength variations were recorded, and changes in microscopic composition were analyzed via XRD, FTIR, and DTG. The results demonstrated that after 21 days of CO₂ exposure, the compressive strength of geopolymers activated by either NaOH or Na₂C₂O₄ + Ca(OH)₂ increased by 7.14–22.58%. Notably, both activators exhibited no significant difference in the CO₂ resistance. Extending the pre-exposure curing time more effectively enhanced the geopolymers’ CO₂ resistance, with samples cured for 7 days exhibiting 28.9–34.2% higher compressive strength than those cured for 1 day. Fourier-deconvolution spectroscopy analysis revealed that N-A-S-H gels displayed superior CO₂ resistance compared to C-A-S-H gels.

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来源期刊

ACS Omega Chemical Engineering-General Chemical Engineering

CiteScore

6.60

自引率

4.90%

发文量

3945

审稿时长

2.4 months

期刊介绍： ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.