Effect of CO2 curing on the resistance of calcium sulfoaluminate cement paste to elevated temperature

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-26 DOI:10.1016/j.conbuildmat.2024.139338

Xuanru Wu , Raju Sharma , Kunal Krishna Das , Jiwhan Ahn , Jeong Gook Jang

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引用次数: 0

Abstract

This study investigates the effect of CO₂ curing on the resistance to elevated temperatures of calcium sulfoaluminate (CSA) cement paste. Water and CO₂-cured CSA cement paste specimens were exposed to elevated temperatures of 150 °C, 300 °C, 500 °C, and 800 °C to evaluate their physicochemical and mechanical properties. The results demonstrate that CO₂ infiltration alters the hydration mechanism of CSA cement, consequently enhancing its physical properties and thermal stability. Exposure to elevated temperatures induces changes in color and the formation of cracks in cement paste samples, with water-cured samples exhibiting more prominent cracks compared to CO₂-cured samples. CO₂-cured samples demonstrate less of a reduction in the compressive strength at high temperatures compared to water-cured samples, an outcome attributed to the enhanced stability and uniform pore size distribution. In conclusion, the CO₂ curing process transforms ettringite and monosulfate into thermally stable calcium carbonate, which significantly enhances the thermal stability of the cement paste.

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CO2养护对硫铝酸钙水泥浆体耐高温性能的影响

研究了CO2养护对硫铝酸钙（CSA）水泥浆体耐高温性能的影响。将水固化和二氧化碳固化的CSA水泥浆体试样分别暴露在150 °C、300 °C、500 °C和800 °C的高温下，以评估其物理化学和力学性能。结果表明，CO2的入渗改变了CSA水泥的水化机理，提高了CSA水泥的物理性能和热稳定性。暴露在高温下会导致水泥膏体样品的颜色变化和裂缝的形成，与二氧化碳固化样品相比，水固化样品表现出更突出的裂缝。与水固化样品相比，二氧化碳固化样品在高温下的抗压强度降低较少，这一结果归因于稳定性增强和孔隙尺寸分布均匀。综上所述，CO2固化工艺将钙矾石和单硫酸盐转化为热稳定的碳酸钙，显著提高了水泥浆体的热稳定性。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.