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Special Issue "New Trends in Geopolymer Concrete"

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: 20 October 2023 | Viewed by 3816

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Dr. Xiaoshuang Shi

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Guest Editor

College of Architecture and Environment, Sichuan University, Chengdu, China
Interests: geopolymeric recycled concrete; durability; low carbon; waste utilization; life cycle analysis

Special Issue Information

Dear Colleagues,

Driven by the goal of carbon neutrality, the building materials industry has discovered great challenges and opportunities. Geopolymer concrete has been recognized as a green and low-carbon cementitious material, because it can employ recyclable raw materials to replace cement as the cementing material, and possesses acceptable and even better properties. The aim of this Special Issue is to gather research regarding the recent scientific progress in geopolymer concrete, to promote the depth and range of this study, so as to develop its popularization and applications. The scope of this Special Issue includes, but is not limit to, the formation mechanism, mixture design method, mechanical properties, durability, microstructure, dynamic properties, structural behaviors, waste utilization, sustainability, and its life cycle environmental evaluation. Furthermore, this Special Issue aims to compile comprehensive knowledge, other potential studies on engineered geopolymer composites, CO₂ capture and utilization, energy storage, 3D printing, bio-materials, numerical study, monitoring methods and artificial intelligence, etc.

We kindly invite you to submit a manuscript(s) for publication in this Special Issue. Original research articles, communications and reviews are all welcome.

Dr. Xiaoshuang Shi
Guest Editor

Manuscript Submission Information

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Keywords

mixture design
workability
curing condition
waste utilization
durability
long-term properties
life cycle assessment
microstructure
carbon dioxide
mechanical properties
composites

Published Papers (4 papers)

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Research

Open AccessArticle

Experimental Study on the Application of Recycled Concrete Waste Powder in Alkali-Activated Foamed Concrete

Dongsheng Zhang

Weiwei Hao

and

Qiuning Yang

Materials 2023, 16(17), 5728; https://doi.org/10.3390/ma16175728 - 22 Aug 2023

Viewed by 346

Abstract

The alkali-activated cementitious material was prepared by partially replacing slag with recycled concrete powder (RCP). The influence of RCP substitution rates (10%, 20%, 30%, 40%, and 50% mass fraction) on the performance of alkali-activated slag-RCP-based (AASR) foamed concrete was studied. The fluidity, water absorption, softening coefficient, compressive strength, flexural strength, drying shrinkage, thermal conductivity, and frost resistance of AASR foamed concrete were studied. The results show that the fluidity and softening coefficient of AASR foamed concrete decreases with the increase in RCP content, and the fluidity range is 230–270 mm. Due to the porous structure of the RCP, the water absorption of AASR increases. With the increase in the curing age, the strength of AASR foamed concrete increases. The addition of RCP reduced the mechanical properties of AASR foamed concrete. Compared with the control group, the compressive strength of AASR50 decreased by 66.7% at 28 days, and the flexural strength decreased by 61.5%. However, the 28 d compressive strength of AASR foamed concrete under all RCP replacement rates still meets the standard value (0.6 MPa). The addition of RCP effectively reduces the thermal conductivity of the AASR foamed concrete, and when the RCP content is 50%, the thermal conductivity is lowest, 0.119 W/(m·K); the drying shrinkage of the AASR foamed concrete can be improved by adding RCP, and the drying shrinkage value is lowest when the RCP is 30%, which is 14.7% lower than that of the control group. The frost resistance of AASR foamed concrete decreases with the increase in the RCP content. When the recycled micropowder content is 20–50% and after 25 freeze–thaw cycles, AASR foamed concrete has reached freeze–thaw damage. Full article

(This article belongs to the Special Issue New Trends in Geopolymer Concrete)

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Open AccessArticle

Comprehensive Evaluation of the Performance and Benefits of SSA–GGBS Geopolymer Mortar

and

Materials 2023, 16(11), 4137; https://doi.org/10.3390/ma16114137 - 01 Jun 2023

Viewed by 577

Abstract

The activity of sewage sludge ash (SSA) is not high; ground granulated blast slag (GGBS) has a high calcium oxide content that can accelerate polymerization rates and exhibit better mechanical performance. In order to improve the engineering application of SSA–GGBS geopolymer, it is necessary to conduct a comprehensive evaluation of its performance and benefits. In this study, the fresh properties, mechanical performance and benefits of geopolymer mortar with different SSA/GGBS, modulus and Na₂O contents were studied. Taking the economic and environmental benefits, working performance and mechanical performance of mortar as evaluation indexes, the entropy weight TOPSIS (Technique for Order Performance by Similarity to Ideal Solution) comprehensive evaluation method is used to evaluate the geopolymer mortar with different proportions. The results show that as SSA/GGBS increases, the workability of mortar decreases, the setting time first increases and then decreases, and the compressive strength and flexural strength decrease. By appropriately increasing the modulus, the workability of the mortar decreases and more silicates are introduced, resulting in increased strength in the later stage. By appropriately increasing the Na₂O content, the volcanic ash activity of SSA and GGBS is better stimulated, the polymerization reaction is accelerated, and the early strength increases. The highest

I_{c}

(integrated cost index,

\frac{C_{t}}{f_{c 28}})

of geopolymer mortar is 33.95 CNY/m³/MPa, and the lowest is 16.21 CNY/m³/MPa, which is at least 41.57% higher than that of ordinary Portland cement (OPC). The minimum

I_{e}

(embodied CO₂ index,

\frac{E_{c}}{f_{c 28}})

is 6.24 kg/m³/MPa, rising up to 14.15 kg/m³/MPa, which is at least 21.39% lower than that of OPC. The optimal mix ratio is a water–cement ratio of 0.4, a cement–sand ratio of 1.0, SSA/GGBS of 2/8, a modulus content of 1.4, and an Na₂O content of 10%. Full article

(This article belongs to the Special Issue New Trends in Geopolymer Concrete)

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Open AccessEditor’s ChoiceArticle

Influence of Waste Glass Particle Size on the Physico-Mechanical Properties and Porosity of Foamed Geopolymer Composites Based on Coal Fly Ash

Celina Ziejewska

Agnieszka Grela

and

Marek Hebda

Materials 2023, 16(5), 2044; https://doi.org/10.3390/ma16052044 - 01 Mar 2023

Cited by 3 | Viewed by 1377

Abstract

In order to protect the environment and counteract climate change, it is necessary to take any actions that enable a reduction in CO₂ emissions. One of the key areas is research focused on developing alternative sustainable materials for construction to reduce the global demand for cement. This work presents the properties of foamed geopolymers with the addition of waste glass as well as determined the optimal size and amount of waste glass for improving the mechanical and physical features of the produced composites. Several geopolymer mixtures were fabricated by replacing coal fly ash with 0%, 10%, 20%, and 30% of waste glass by weight. Moreover, the effect of using different particle size ranges of the addition (0.1–1200 µm; 200–1200 µm; 100–250 µm; 63–120 µm; 40–63 µm; 0.1–40 µm) in the geopolymer matrix was examined. Based on the results, it was found that the application of 20–30% of waste glass with a particle size range of 0.1–1200 µm and a mean diameter of 550 µm resulted in approximately 80% higher compressive strength in comparison to unmodified material. Moreover, the samples produced using the smallest fraction (0.1–40 µm) of waste glass in the amount of 30% reached the highest specific surface area (43.711 m²/g), maximum porosity (69%), and density of 0.6 g/cm³. Full article

(This article belongs to the Special Issue New Trends in Geopolymer Concrete)

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Open AccessArticle

Experimental Analysis and Establishment of Strength Attenuation Model of POM Fiber Reinforced Geopolymeric Recycled Concrete under Freeze-Thaw Cycles

and

Materials 2023, 16(4), 1699; https://doi.org/10.3390/ma16041699 - 17 Feb 2023

Cited by 2 | Viewed by 868

Abstract

Geopolymeric recycled concrete (GRC) is a new low-carbon building material that uses both construction and industrial solid waste to replace natural aggregate and cement. GRC is similar to geopolymeric concrete (GPC) in that it has good mechanical properties but needs to be improved in terms of frost resistance. Previous studies have shown that polyoxymethylene fiber (POM fiber) can improve the shrinkage and durability of concrete and is superior to other commonly used fibers. Therefore, this paper explores adding POM fiber to GRC to improve its frost resistance. In this paper, the influence of different volumes and lengths of POM fiber on the frost resistance of geopolymeric recycled concrete (PRGRC) is studied. By measuring the changes in mass loss rate, relative dynamic elastic modulus, and compressive strength of PRGRC under different cycles, the improvement effect of POM fiber on the freeze-thaw damage of GRC is analyzed, and the strength attenuation model of PRGRC is established. The results show that the increase in POM fiber content can effectively slow down the mass loss of PRGRC in the freeze-thaw cycles, the reduction rate of relative dynamic elastic modulus, and the reduction rate of compressive strength. This shows that POM fiber can effectively improve the frost resistance of PRGRC, and the effect of 6 mm POM fiber on the freeze-thaw damage of PRGRC is better than 12 mm POM fiber. According to the test results, the existing strength attenuation model is further modified, the attenuation model of PRGRC compressive strength under the freeze-thaw cycle is obtained, and the model fitting effect is good. The strengthening mechanism of POM fiber is explained by the structural relationship between POM fiber and concrete matrix in the SEM micrograph of PRGRC. The research results provide a scientific basis for the applicability of POM fiber in geopolymeric cementitious materials and improving the frost resistance of PRGRC. Full article

(This article belongs to the Special Issue New Trends in Geopolymer Concrete)

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