Recent Advances of Low-Carbon Cement

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 1483

Special Issue Editors

School of Materials Science and Engineering, Tongji University, Shanghai, China
Interests: cement; concrete
Dr. Xiaodi Dai
E-Mail Website
Guest Editor
Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA
Interests: cement

Special Issue Information

Dear Colleagues,

The development of low-carbon cement has gained recognition as a strategy for mitigating the carbon footprint of the Portland cement industry, in response to escalating global concerns regarding CO2 emissions from the construction sector. Low-carbon cement supports sustainable construction practices, helps to meet regulatory requirements, and taps into the growing market demand for environmentally friendly products. There are different types of low-cabon cement, such as limestone calcined clay-based cement (LC3), alkali-activated cement/geopolymers, carbonate cement, and belite-ye'elimite-based cement. Therefore, the topics of interest include but are not limited to the following: recent advances in rhelogical properties, setting behaviour, volume stability, mechanical behaviour, and multiscale modelling of low-carbon cements.

Dr. Qiang Ren
Dr. Xiaodi Dai
Guest Editors

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Keywords

  • rheology
  • mechanical properties
  • thermodynamic modelling
  • volume stability
  • low-carbon cement

Published Papers (2 papers)

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Research

14 pages, 1886 KiB  
Article
Synergistic Improvement in Setting and Hardening Performance of OPC-CSA Binary Blended Cement: Combined Effect of Nano Calcium Carbonate and Aluminum Sulfate
Appl. Sci. 2024, 14(5), 2062; https://doi.org/10.3390/app14052062 - 01 Mar 2024
Abstract
The combined effect and corresponding mechanism of nano calcium carbonate (NC) and aluminum sulfate (AS) on the setting and hardening performance of binary blended cement (ordinary Portland cement (OPC) and calcium sulfoaluminate cement (CSA)) were evaluated through multiple experiments, including setting time, calorimetry, [...] Read more.
The combined effect and corresponding mechanism of nano calcium carbonate (NC) and aluminum sulfate (AS) on the setting and hardening performance of binary blended cement (ordinary Portland cement (OPC) and calcium sulfoaluminate cement (CSA)) were evaluated through multiple experiments, including setting time, calorimetry, compressive strength, X-ray diffraction (XRD), and mercury intrusion porosimetry (MIP). The results showed that, as compared to OPC, OPC-CSA binary blended cement exhibited reduced setting time but decreased early strength, which could be caused by the depressed silicate phase hydration due to the fast supply of aluminate ions during the hydration of aluminate-contained phases contained in CSA. However, through the combined addition of NC and AS, the depressed silicate phase hydration was greatly promoted by NC due to its nucleation effect, and the reduced early strength was significantly improved. Further analysis indicates that the combined addition of NC and AS can promote the formation of C-S-H gel and decrease the porosity of the hardened OPC-CSA binary paste. In this way, one promising repair material with rapid setting and hardening properties was prepared by OPC-CSA binary blended cement with the combined addition of NC and AS. Full article
(This article belongs to the Special Issue Recent Advances of Low-Carbon Cement)
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15 pages, 2575 KiB  
Article
Aloe Vera-Based Concrete Superplasticizer for Enhanced Consolidation with Limestone Calcined Clay Cement
Appl. Sci. 2024, 14(1), 358; https://doi.org/10.3390/app14010358 - 30 Dec 2023
Viewed by 1155
Abstract
Self-consolidating concrete (SCC) is renowned for its outstanding workability and ability to seamlessly flow into intricate structures with minimal vibrations, achieved through the incorporation of chemical admixtures. This study pioneers an innovative approach by exploring the use of the cost-effective and readily available [...] Read more.
Self-consolidating concrete (SCC) is renowned for its outstanding workability and ability to seamlessly flow into intricate structures with minimal vibrations, achieved through the incorporation of chemical admixtures. This study pioneers an innovative approach by exploring the use of the cost-effective and readily available plant extract aloe vera mucilage (AVM) as a bio-admixture for SCC. The primary objective is to assess the impact of AVM on SCC formulations, including those comprising ordinary Portland cement (OPC) and blended cement LC3 (clinker 50%, calcined waste clay 30%, limestone 15%, gypsum 5%). AVM is applied at varying dosages at up to 10%. Findings reveal that LC3 exhibits lower consistency, reduced slump values, and extended initial and final setting times compared to OPC. With increasing plasticizer dosage, V-funnel and L-box values decrease. Notably, OPC samples with both plasticizers outperform LC3 in compressive strength at 7, 14, and 28 days. Significantly, a 2.5% AVM dosage demonstrates enhanced compressive strength in both OPC and LC3 samples. In summary, this research positions AVM as an innovative and comparable alternative to commercial plasticizers, contributing to reduced yield stress and increased slump flow in SCC. Full article
(This article belongs to the Special Issue Recent Advances of Low-Carbon Cement)
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