Prediction Model for Carbonation Depth of Mineral Admixture Concrete UnderEarly-age CO2 Capture
ZHOU Ming1, WANG Feifan1, WEN Xiaodong1,*, GUAN Xiaojun2, WENG Gongwei2
1 Zhejiang Key Laboratory of Intelligent Construction and Operation & Maintenance for Deep-Sea Foundations, Ningbo University of Technology, Ningbo 315211, Zhejiang, China 2 Ningbo Construction Engineering Group Co., Ltd., Ningbo 315211, Zhejiang, China
Abstract: Mineral admixture concrete carbon capture technology has emerged as a research focus in negative emission technologies due to its substantial carbon sequestration potential and high utilization rate of industrial solid waste. However, early-age carbonation significantly increases the risk of steel reinforcement corrosion. Existing carbonation models, primarily based on 28-day standard-cured specimens, exhibit considerable conservative bias when predicting the carbonation behavior of concrete containing high-volume mineral admixtures and subjected to early-age exposure. To address this limitation, fifteen groups of fly ash (FA) and ground granulated blast furnace slag (GGBS) concrete specimens were prepared and subjected to accelerated carbonation tests after 14 days of standard curing. Building upon the Huang Shiyuan model framework, a Mineral Admixture Carbonation Rate Influence Coefficient (Km) was introduced for the first time to characterize the early-age effects of admixture type and dosage, and the Particle Swarm Optimization (PSO) algorithm, with global search capability in multi-parameter nonlinear systems, was used to optimize the parameters. The newly introduced Km coefficient quantitatively captures the differential effects of FA and GGBS, supported by microstructural reasoning. Independent validation confirmed its general applicability even for concrete incorporating FA, GGBS, and a wider range of water-to-binder ratios (W/B) (measured-to-predicted ratio: 0.93±0.15). This model provides a theoretical tool for managing the early-age steel reinforcement corrosion risk in carbon capture concrete.
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2026, Vol. 40 
