Effect of CSH-PCE nanocomposites on early hydration of the ternary binder containing Portland cement, limestone, and calcined coal gangue

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-03 DOI:10.1007/s10973-024-13501-0
Ying Liu, Qinghui Yang, Yuantao Wang, Shufeng Liu, Yuanyuan Huang, Delu Zou, Xueyan Fan, Haoran Zhai, Yongling Ding
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Abstract

In this work, the impact of lab synthetic addition agent, CSH-PCE nanocomposites (CPNs), on the early hydration property of the ternary binder containing Portland cement, limestone, and calcined coal gangue was investigated. CPNs were added in partial substitution of Portland cement by mass at 0%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0%. X-ray diffraction (XRD), isothermal calorimetry, mercury intrusion porosimetry, and scanning electron microscopy were used to characterize the hydration and hydrates of the CPNs-modified pastes systematically. The workability and compressive strength of this ternary system was also studied. The obtained results indicated that the use of CPNs continuously improved the workability of the ternary mortar. The compressive strength of the ternary mortar increased with CPNs additions until the threshold limits of 3.0% and 2.5% before and after 12 h, under which the strength values were even higher than the reference OPC mortar at each age. Isothermal calorimetry results indicated that CPNs promoted cement hydration and produced more hydrates, which were also verified by the qualitative XRD analysis. This promotion effect leads to significant reduction in porosity as well as densification in microstructure within the ternary paste, ultimately resulting in enhanced early-age compressive strength. These findings provide valuable insights for designing lower carbon footprint ternary blends incorporating calcined coal gangue and limestone while maintaining comparable early-age compressive strength to traditional cement.

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CSH-PCE 纳米复合材料对含硅酸盐水泥、石灰石和煅烧煤矸石的三元粘结剂早期水化的影响
在这项工作中,研究了实验室合成添加剂 CSH-PCE 纳米复合材料(CPNs)对含硅酸盐水泥、石灰石和煅烧煤矸石的三元粘结剂早期水化性能的影响。CPN 的添加量为 0%、0.5%、1.0%、1.5%、2.0%、2.5% 和 3.0%,部分替代硅酸盐水泥。采用 X 射线衍射 (XRD)、等温量热法、水银渗入式孔隙测定法和扫描电子显微镜对 CPNs 改性浆料的水化和水合物进行了系统表征。此外,还研究了该三元体系的可操作性和抗压强度。结果表明,氯化萘的使用持续改善了三元砂浆的工作性。三元砂浆的抗压强度随着氯化石蜡萘添加量的增加而增加,直到 12 小时前后达到 3.0% 和 2.5% 的临界值,在此临界值下,各龄期的强度值甚至高于参考 OPC 砂浆。等温量热仪结果表明,氯化萘促进了水泥水化,产生了更多的水合物,这一点也在定性 XRD 分析中得到了验证。这种促进作用显著降低了孔隙率,并使三元浆料的微观结构致密化,最终提高了早期龄期抗压强度。这些发现为设计掺入煅烧煤矸石和石灰石的低碳足迹三元混合物,同时保持与传统水泥相当的龄期抗压强度提供了宝贵的见解。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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