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Concrete Characteristics and Experimental Research in Civil Engineering on Low-Carbon Concrete

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Sustainable Engineering and Science".

Deadline for manuscript submissions: closed (1 April 2024) | Viewed by 1748

Special Issue Editors


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Guest Editor
Research Center for Wind Engineering and Engineering Vibration, Guangzhou University, Guangzhou 510006, China
Interests: low-carbon concrete; new cementitious materials; geopolymer; alkali-activated materials
Research Center for Wind Engineering and Engineering Vibration, Guangzhou University, Guangzhou 510006, China
Interests: geopolymers; coal ash; alkali; corrosion; corrosion inhibitors; reinforced concrete; Portland cement; cement; mortar

Special Issue Information

Dear Colleagues,

The global production of concrete persists at the highest level in decades. The production of cement and concrete is known for its high energy consumption and high emissions, which contributes to approximately 8% of global CO2 emissions. Furthermore, the natural resources used in concrete manufacturing, e.g., limestone, natural sand, and aggregates, etc., are becoming scarce. Therefore, the development of sustainable and low-carbon concrete is essential and has become one of the main topics for both researchers and industry. Advanced technology capable of producing clinker-free cementitious materials, such as alkali-activated materials, as well as the incorporation of high-volume industrial wastes and building demolition, e.g., recycled sands and aggregates into concrete have been attracting more and more attention recently.  

This Special Issue on "Concrete Characteristics and Experimental Research in Civil Engineering on Low-Carbon Concrete" seeks high-quality works focusing on new approaches and technologies of low-carbon concrete production, new techniques for concrete characterization, the use of potential industrial or construction solid wastes in concrete, experimental research on the structure and engineering properties of concrete, advanced strategies in the recycle, and reuse of construction waste, etc.

Original research articles, reviews, and case studies associated with low-carbon concrete or cementitious materials are welcomed and encouraged. Research areas may include (but are not limited to) the following:

  1. Microstructure characterization and engineering properties of low-carbon cement and concrete.
  2. Alkali-activated materials with solid wastes as precursors.
  3. Advanced strategies in the recycling and reuse of construction waste.
  4. Application and experimental evaluation of low-carbon materials in structures.
  5. Durability and lifecycle assessments of low-carbon cement or concrete.

We are sincerely looking forward to receiving your contributions.

Prof. Dr. Jiyang Fu
Dr. Yuwei Ma
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • low-carbon concrete
  • concrete characterization techniques
  • alkali-activated materials
  • wastes utilization
  • engineering properties

Published Papers (2 papers)

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Research

17 pages, 3097 KiB  
Article
Effect of Activator and Mineral Admixtures on the Autogenous Shrinkage of Alkali-Activated Slag/Fly Ash
by Yuwei Ma, Jihao Gong, Guang Ye and Jiyang Fu
Sustainability 2023, 15(22), 16101; https://doi.org/10.3390/su152216101 - 20 Nov 2023
Viewed by 690
Abstract
The high autogenous shrinkage of alkali-activated fly ash/slag (AASF) poses a significant concern for the widespread application of AASF in structural engineering. The present study compares the efficacy of activator and mineral admixtures in mitigating the autogenous shrinkage of AASF, and discusses the [...] Read more.
The high autogenous shrinkage of alkali-activated fly ash/slag (AASF) poses a significant concern for the widespread application of AASF in structural engineering. The present study compares the efficacy of activator and mineral admixtures in mitigating the autogenous shrinkage of AASF, and discusses the underlying mechanism. The results show that the use of activators with a lower silicate modulus and a lower sodium content, as well as incorporating metakaolin (MK) or silica fume, can reduce the autogenous shrinkage of AAMs. These approaches delay the appearance of the second exothermic peak, which corresponds to the later formation of C-A-S-H gels and slower development of capillary pressure. The inclusion of MK not only retards the reaction but also facilitates the formation of N-A-S-H gels, resulting in a coarse pore structure and reduced water consumption. The use of the activator with a lower silicate modulus (reduced from 1.5 to 1.0) leads to a higher internal relative humidity and the reduced pore volume of silt-shaped and ink-bottle pores (2–50 nm) in AASF, thereby reducing the autogenous shrinkage without significant strength reduction. Full article
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17 pages, 8924 KiB  
Article
Calcium Leaching of 3D-Printed Cement Paste Exposed to Ammonium Chloride Solutions
by Huashan Yang, Yujun Che and Jie Luo
Sustainability 2023, 15(17), 12688; https://doi.org/10.3390/su151712688 - 22 Aug 2023
Cited by 1 | Viewed by 648
Abstract
Understanding the degradation of 3D-printed cement paste (3DPC) is essential to evaluate changes in the long-term durability of concrete structures subjected to aggressive water. However, the degradation mechanism of 3DPC has yet to be reported, as the microstructure and pore characteristics of 3DPC [...] Read more.
Understanding the degradation of 3D-printed cement paste (3DPC) is essential to evaluate changes in the long-term durability of concrete structures subjected to aggressive water. However, the degradation mechanism of 3DPC has yet to be reported, as the microstructure and pore characteristics of 3DPC are very different from those of its cast counterparts. This work studies the performance anisotropy of 3DPC due to calcium leaching to investigate the degradation mechanism. Samples with aggregate micro fines (AMF) and fly ash (FA) were prepared. A 6 mol/L NH4Cl solution was used in the accelerated experiment. At specific leaching durations, performances were tested on the samples in different leaching directions. The performance anisotropy of 3DPC exposed to aggressive water was investigated by comparing the changes in bulk density, water absorption, leaching depths, and compressive strength in different leaching directions. X-ray diffraction (XRD), differential thermal gravity-thermogravimetric (DTG−TG), and mercury intrusion porosimetry (MIP) were used to characterize the changes in hydration products and pore structure in different leaching directions. The results show that the performances of 3DPC in aggressive water have a significant anisotropic behavior. The evolution of pore defects and hydration products mainly governs the performance anisotropy of degraded 3DPC. The remaining hydration products of the surface of 3DPC leached in the Z direction are fewer than the other two directions because calcium ions leached in the Z direction are difficult to compensate through weak interfaces between layers. The test results clearly show that the calcium leaching mechanism of 3DPC in aggressive water is directly influenced by the hydration products, such as portlandite (CH) and C-S-H, and the pores. The current study may help us understand the degradation mechanism of 3DPC to assess its durability performance anisotropy. Full article
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