碳化固化水泥基复合材料的碳化固化和耐久性的基本理解:综述,Journal of CO2 Utilization

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碳化固化水泥基复合材料的碳化固化和耐久性的基本理解:综述,Journal of CO2 Utilization

2024-03-04 21:37| 来源: 网络整理| 查看: 265

为了应对大气中不断上升的CO 2浓度,碳固存技术正在兴起。作为这些技术之一,早期的水泥基复合材料的碳化固化显示出巨大的潜力,因为其广泛的应用和有益之处在于为水泥基复合材料提供了增强的机械性能和耐久性。但是,碳化固化主要在实验室规模上进行研究,因为在将其广泛应用于工业规模生产之前应解决两个主要挑战:(1)CO 2固存率仍然很低,大约为20%–由于CO 2的限制,理论电位的50%在碳化固化过程中扩散到基体中;(2)碳化固化对水泥基复合材料耐久性的影响及其机理尚不清楚,特别是对于某些关键方面,例如碱-硅反应,腐蚀和硫酸盐侵蚀。因此,本文着重讨论:(1)在碳化固化的每个阶段影响水泥基复合材料中CO 2固存的因素以及高CO 2碳化固化的优化方法。固存速率,而不会降低机械性能和耐久性,以及(2)碳化固化对耐久性和相应机理的不同方面的影响。在此审查的基础上,旨在应对当前挑战的未来研究受到启发,以理解和促进通过水泥基复合材料的碳化固化来固碳。

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Fundamental understanding of carbonation curing and durability of carbonation-cured cement-based composites: A review

To tackle the rising CO2 concentration in atmosphere, technologies of carbon sequestration are emerging. As one of these technologies, carbonation curing of cement-based composite at early age shows a great potential because its wide application and benefits to provide cement-based composite with enhanced mechanical properties and durability. However, carbonation curing is mostly investigated on lab-scale, due to two main challenges that should be addressed before it can be widely applied for industrial-scale production: (1) CO2 sequestration rate is still low, which is around 20 %–50 % of the theoretical potential because of the limitation of CO2 diffusion into matrix during the carbonation curing; and (2) the effect carbonation curing on the durability of cement-based composites and the underlying mechanisms remains unclear, especially for some critical aspects such as alkali-silica reaction, corrosion, and sulfate attack. Therefore, this paper focuses on discussing: (1) factors affecting CO2 sequestration in cement-based composite during each stage of carbonation curing and the optimization methods of carbonation curing for high CO2 sequestration rate without mitigating mechanical properties and durability, and (2) effects of carbonation curing on different aspects of durability and the corresponding mechanisms. Based on the review, future studies on addressing current challenges are inspired to comprehend and promote the carbon sequestration by carbonation curing of cement-based composites.



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