二氧化碳养护混凝土活性组分固碳率评价方法

doi:10.16085/j.issn.1000-6613.2021-1082

摘要/Abstract

摘要：

CO₂养护混凝土技术作为一种新型的CO₂利用技术，既能实现工业固废的资源化利用，又能实现温室气体的永久封存，近年来受到越来越多的关注。由于混凝土原料组分复杂、养护工艺路线多样，关键指标固碳率的评价方法也各不相同，因此亟需形成适用于不同工业固废混凝土产品体系的固碳率通用评价新方法。在对已有诸多评价方法进行比较后，本文提出一种适用性和可操作性较好的增重法-烘至绝干法的固碳量评价新方法和基于修正后活性组分质量的折算基准，在Steinour公式基础上，通过对工业固废中常见的钙、镁组分中惰性部分进一步辨别、扣除，可以直观地反映原料中活性组分的有效反应程度。水泥净浆体系实验表明，烘至绝干法可以更合理地补偿水蒸发带来的误差，适用于工业规模的固碳率评价。多种固废混凝土体系实验表明，以修正后的活性组分质量为基准可以体现试件中活性组分的碳酸化程度，排除了试件中含水率和惰性组分的影响。最后，利用本文提出的评价方法，对河南焦作CO₂养护混凝土工业单釜试验产品的固碳率进行评价，为CO₂养护技术的指标评价提供了更完善的科学依据。

关键词: 二氧化碳养护, 混凝土, 活性组分, 固碳率

Abstract:

As a new CO₂ utilization technology, carbonation curing can not only recycle industrial solid wastes, but also sequestrate greenhouse gases permanently, which has attracted more and more attention in recent years. However, due to the complex compositions of raw materials and diverse curing processes, the assessment methods for CO₂ uptake ratio are different. Thus, it is urgent to form a universal assessment method suitable for different concrete products and curing processes. After comparing many assessment methods of CO₂ uptake ratio, a new weight gain and oven-dry method with good applicability and operability and a new basis based on the revised mass of reactive compositions have been proposed. Based on the Steinour formular, the inert compositions in calcium and magnesium components are further deducted, which can help for reasonable assessment of the effective reaction degree of reactive compositions. For cement paste samples, results showed that oven-dry method could compensate the error caused by water evaporation more reasonably, and it was suitable for industrial-scale CO₂ uptake ratio evaluation. For solid waste concrete samples, results showed that the basis of modified reactive compositions mass reflected the carbonation degree of the reactive compositions, and the influences of moisture content and inert components were excluded. Finally, the assessment method proposed in this paper was used to evaluate the CO₂ uptake ratio of carbonation-cured concrete in the industrial demonstration of Jiaozuo, Henan, which provided a more reasonable method of the carbonation curing technology.

Key words: carbon dioxide(CO₂) curing, concrete, reactive compositions, CO₂ uptake ratio

中图分类号:

X705

郭若楠, 易臻伟, 王涛, 宋佳奕, 方梦祥. 二氧化碳养护混凝土活性组分固碳率评价方法[J]. 化工进展, 2022, 41(5): 2722-2732.

GUO Ruonan, YI Zhenwei, WANG Tao, SONG Jiayi, FANG Mengxiang. Assessment method of CO₂ uptake ratio of carbonation-cured concrete based on reactive compositions[J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2722-2732.

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