Alkali-Activated Materials with Seawater and Sea Sand

Topic Information

Dear Colleagues,

In the past decade, increasing progress has been made in developing sustainable cementitious materials with a reduced carbon footprint. Benefiting from high-quality engineering and low carbon emission properties, alkali-activated materials (AAMs), including geopolymer, are regarded as one of the most robust alternatives to Portland cement. However, much is still unknown about the durability of AAMs, to some extent limiting its commercial adoption. Stemming from the differences in its reaction products and microstructures, AAMs behave distinctively with Portland cement after being exposed to aggressive testing conditions, such as elevated concentrations of CO₂, sulfates, and chlorides, as well as freeze–thaw cycles. Additionally, assessments of its corrosion mechanisms also vary. Therefore, it is important to take an in-depth look at the durability of AAMs and to explore future directions for the design, development, and implementation of sustainable and durable AAMs.

Therefore, topics of interest include but are not limited to the following:

(1) Design of sustainable AAMs;
(2) Durability performance of AAMs (e.g., carbonation, chloride/sulfate/acid attack, freeze/thaw, abrasion, etc.);
(3) Development and standardization of test methods;
(4) Durability assessment and service-life prediction.

Dr. Zengqing Sun
Prof. Dr. Xiaohui Fan
Dr. Xiaochen Lin
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Buildings buildings	3.1	3.4	2011	15.3 Days	CHF 2600
Construction Materials constrmater	-	-	2021	20.8 Days	CHF 1000
Infrastructures infrastructures	2.7	5.2	2016	17.8 Days	CHF 1800
Materials materials	3.1	5.8	2008	13.9 Days	CHF 2600
Minerals minerals	2.2	4.1	2011	18 Days	CHF 2400

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Published Papers (2 papers)

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All Buildings Construction Materials Infrastructures Materials Minerals

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19 pages, 4605 KiB  

Open AccessReview

Recent Advances in Alkali-Activated Materials with Seawater and Sea Sand

by Zengqing Sun, Xiaoyu Li, Qingsong Liu, Qingyu Tang, Xiaochen Lin, Xiaohui Fan, Xiaoxian Huang, Min Gan, Xuling Chen and Zhiyun Ji

Materials 2023, 16(9), 3571; https://doi.org/10.3390/ma16093571 - 6 May 2023

Cited by 7 | Viewed by 2491

Abstract

The development of sustainable cementitious materials is essential and urgent for the construction industry. Benefiting from excellent engineering properties and a reduced greenhouse gas footprint, alkali-activated materials (AAM) are among the robust alternatives to Portland cement for civil infrastructure. Meanwhile, concrete production also [...] Read more.

The development of sustainable cementitious materials is essential and urgent for the construction industry. Benefiting from excellent engineering properties and a reduced greenhouse gas footprint, alkali-activated materials (AAM) are among the robust alternatives to Portland cement for civil infrastructure. Meanwhile, concrete production also accounts for around 20% of all industrial water consumption, and the global freshwater shortage is increasing. This review discusses recent investigations on seawater-mixed AAMs, including the effects of seawater on workability, reaction mechanism, shrinkage, short and long-term strength, binding of chloride and corrosion of steel reinforcement. Attention is also paid to the utilization of sea sand as aggregate, as well as discussions on the challenges and further research perspectives on the field application of AAMs with seawater and sea sand. Full article

(This article belongs to the Topic Alkali-Activated Materials with Seawater and Sea Sand)

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14 pages, 7542 KiB  

Open AccessArticle

Efficient Co-Valorization of Phosphogypsum and Red Mud for Synthesis of Alkali-Activated Materials

by Qingsong Liu, Xiangci Xue, Zengqing Sun, Xiaoxian Huang, Min Gan, Zhiyun Ji, Xuling Chen and Xiaohui Fan

Materials 2023, 16(9), 3541; https://doi.org/10.3390/ma16093541 - 5 May 2023

Viewed by 1592

Abstract

Phosphogypsum and red mud are bulk industrial solid wastes that trigger local environmental problems. In the present investigation, an efficient valorization process was developed through which phosphogypsum and red mud can be transformed into a precursor for the synthesis of high-strength, alkali-activated materials [...] Read more.

Phosphogypsum and red mud are bulk industrial solid wastes that trigger local environmental problems. In the present investigation, an efficient valorization process was developed through which phosphogypsum and red mud can be transformed into a precursor for the synthesis of high-strength, alkali-activated materials with a seawater-bearing sodium silicate solution as the alkaline activator. The effects of the activator modulus and liquid-to-solid ratio on the strength evolution of the synthesized AAMs as well as the microstructure and chemistry of the reaction products were investigated. The results showed that mineral reconstruction between PG and RM took place during calcination at 950 °C, forming ye’elimite, anhydrite and gehlenite, which then took part in the alkali-activation process and generated thenardite and C-A-S-H gel. The mechanical properties of the synthesized AAMs, ranging from 12.9 MPa to 40.6 MPa, were determined with the activator modulus and liquid-to-solid ratio. Results from the present investigation contributed to the facile and efficient valorization of phosphogypsum and red mud into cementitious construction materials. Full article

(This article belongs to the Topic Alkali-Activated Materials with Seawater and Sea Sand)

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