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Special Issue "Carbon Peaking and Carbon Neutrality in the Cement-Based Materials (2nd Edition)"

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Dear Colleagues,

Cement is mainly used as a binder for concrete and is the basic material of reinforced concrete structures. In 2020, the global cement content was approximately 4.1 billion tons. The carbon dioxide emissions of the cement industry account for about 7% of the total global carbon dioxide emissions. The low-carbon development of the cement and concrete industries is of great significance for achieving carbon peaks and carbon neutrality. The purpose of this Special Issue is to provide an exchange platform on carbon peaking and carbon neutrality in the cement and concrete industries. Through the exchange of theory, experiments, and engineering applications, we can find practical solutions for carbon peaking and carbon neutralization in the cement and concrete industry. This Special Issue welcomes research papers and review papers. Possible research topics include, but are not limited to, the following:

Low-carbon cement and concrete;
Magnesia-based cement;
Alkali-activated cement and concrete;
Mineral admixtures;
Carbonation curing of concrete;
Carbon capture;
Carbon sequestration;
Energy-saving and emission reduction in cement production;
Material design considering CO₂ emission;
Recycled aggregate concrete;
Durability and sustainability.

Prof. Dr. Xiaoyong Wang
Dr. Run-Sheng Lin
Guest Editors

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Keywords

blended concrete
carbon neutrality
CO₂ emission
sustainability
durability
geopolymer
supplementary cementitious materials

Published Papers (2 papers)

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Research

Open AccessArticle

Low-CO₂ Optimization Design of Quaternary Binder Containing Calcined Clay, Slag, and Limestone

and

Materials 2023, 16(19), 6385; https://doi.org/10.3390/ma16196385 - 24 Sep 2023

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Abstract

Blended cement is commonly used for producing sustainable concretes. This paper presents an experimental study and an optimization design of a low-CO₂ quaternary binder containing calcined clay, slag, and limestone using the response surface method. First, a Box–Behnken design with three influencing factors and three levels was used for the combination design of the quaternary composite cement. The lower limit of the mineral admixtures was 0%. The upper limits of slag, calcined clay, and limestone powder were 30%, 20%, and 10%, respectively. The water-to-binder ratio (water/binder) was 0.5. Experimental works to examine workability and strength (at 3 and 28 days) were performed for the composite cement. The CO₂ emissions were calculated considering binder compositions. A second-order polynomial regression was used to evaluate the experimental results. In addition, a low-CO₂ optimization design was conducted for the composite cement using a composite desirability function. The objectives of the optimization design were the target 28-day strength (30, 35, 40, and 45 MPa), target workability (160 mm flow), and low CO₂ emissions. The trends of the properties of optimal combinations were consistent with those in the test results. In summary, the proposed optimization design can be used for designing composite cement considering strength, workability, and ecological aspects. Full article

(This article belongs to the Special Issue Carbon Peaking and Carbon Neutrality in the Cement-Based Materials (2nd Edition))

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Open AccessArticle

The Effects of Crystalline Admixture on the Self-Healing Performance and Mechanical Properties of Mortar with Internally Added Superabsorbent Polymer

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Materials 2023, 16(14), 5052; https://doi.org/10.3390/ma16145052 - 17 Jul 2023

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Abstract

Crystalline admixture (CA) can be incorporated into concrete to achieve self-healing of concrete cracks. In this study, both CA and superabsorbent polymer (SAP) were used as self-healing agents to investigate the effects of CA on the self-healing performance and mechanical properties of mortar with internally added SAP at different self-healing ages. The healing effect of cracks in mortar is assessed by crack observation and impermeability. The structure and composition of the filler in the cracks were analyzed by microscopic experiment. The experimental results indicate that CA enhances the healing of cracks in mortar specimens. The chemical reactions of CA primarily contribute to significantly improving the early-age crack-healing ability of the specimens, and the water absorption and expansion ability as well as the internal curing effect of SAP also facilitate the crack-healing process. Increasing the CA content leads to an increase in the Ca/Si ratio of C-S-H, causing a transition from a layered structure to a more compact needle-like structure. When 4% CA was added to the mortar, it resulted in an adequate formation of needle-like C-S-H structures, which eventually penetrate and fill the pits formed by SAP, compensating for the strength loss caused by SAP. Full article

(This article belongs to the Special Issue Carbon Peaking and Carbon Neutrality in the Cement-Based Materials (2nd Edition))

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Special Issue "Carbon Peaking and Carbon Neutrality in the Cement-Based Materials (2nd Edition)"

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