Enduring performance of alkali-activated mortars with metakaolin as granulated blast furnace slag replacement

Asaad, Mohammad Ali; Huseien, Ghasan Fahim; Memon, Ruhal Pervez; Ghoshal, Sib Krishna; Mohammadhosseini, Hossein; Alyousef, Rayed

doi:10.1016/j.cscm.2021.e00845

Cited by 9 publications

(16 citation statements)

References 68 publications

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“…These industrial by-products comprise Si, Al, and/or Ca, acting as binding material in geopolymer concrete. The previous literature confirms that the FA-GBFS-based geopolymer has excellent mechanical and durability features (Alharbi and Abadel, 2022; Algaifi et al, 2021; Asaad et al, 2022; Maras, 2021).…”

Section: Introductionsupporting

confidence: 62%

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Nikoo

Hafeez

Faridmehr

et al. 2023

Advances in Structural Engineering

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Geopolymer concrete has developed as a potential alternative to ordinary Portland cement-based concrete, wherein various industrial by-products have been converted as beneficial spin-offs. Apart from appropriate compressive strength in the construction sector worldwide, the durability, sound absorption, thermal conductivity, and weight of concrete are also major concerns. Lightweight geopolymer concretes have gained attention because of their superior strength, durability, lower environmental impact, and sustainable characteristics. In this view, the current study examined the feasibility of using sawdust as a natural fine and coarse aggregate substitution in fly ash (FA)-granulated blast furnace slag (GBFS) based geopolymer concrete. Four mixes with a different percentage of sawdust (25, 50, 75, and 100) substituting natural aggregate were designed to examine the effects of sawdust on fresh and hardened features of geopolymer concrete compared to those conventional FA-GBFS-based geopolymer concrete with natural aggregate. Sodium silicate (NS) and sodium hydroxide (NH) (with NS/NH ratio of 0.75) were utilized to dissolve the alumina silicate from FA and GBFS. Informational models were developed using an experimental dataset to estimate the compressive strength of geopolymer concrete mix designs. Besides, using the weight of the developed network, a global sensitivity (GS) analysis was developed to identify the sensitivity of compressive strength to the waste sawdust content. Test results confirmed that by substituting natural aggregate with 100% sawdust, there was around a 35% decrease in compressive strength. Nevertheless, the sound absorption coefficient was increased by an average of 38% in frequencies range between 1800 and 2500 HZ, and thermal conductivity decreased by around 4.5 times once the natural aggregate was substituted by 100% sawdust.

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Section: Introductionsupporting

confidence: 62%

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Nikoo

Hafeez

Faridmehr

et al. 2023

Advances in Structural Engineering

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“…The widely recognized mechanism of DS is that when the water gradually evaporates, surface tension is generated when the menisci are formed in the gel pores and capillary pores, thereby causing an equal compressive stress in the skeleton and causing volume shrinkage 14,15 . Current research primarily focuses on reducing the DS of AAMs by incorporating bers [16][17][18] , chemical admixtures 4,19 , and mineral admixtures 20,21 , as well as changing the curing system [22][23][24] . Changing the curing system, while effectively reducing shrinkage, may also lead to a decrease in mechanical properties and issues of unstable internal curing humidity 24 .…”

Section: Introductionmentioning

confidence: 99%

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Chen,

Qin,

Chen

et al. 2024

Preprint

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Alkali-activated materials (AAMs) possess several advantages, such as high strengths and low carbon emissions. However, their application is hindered due to their significant shrinkage. This study explored the effect of borax-modified sodium silicate activator and metakaolin (MK) on the mechanical properties and drying shrinkage (DS) of alkali-activated slag (AAS) and AAS/MK (AASM) mortars. X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy were used to characterize the hydration products. The results show that the DS reduction of the AAS mortar is related to decreased Na2O content, a reduction in the proportion of mesopores, and the formation of moisture-retaining borate compounds. The DS reduction of the AASM mortar is attributed to the ultra-fine differential effect induced by MK, reducing the connected pores. The modified activator combined with MK increased the chemically bound water content in the matrix. Additionally, the B-O bond and highly active MK improved compactness of the AASM mortar.

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“…Consequently, the aggressive substances and agents pass through these permeable sites, causing rapid deterioration of concrete. Hence, the durability of concrete and its steel reinforcement are negatively impacted, indicating that the concrete performance in the long-term is decided by the environment wherein concrete structures are placed [2]. Reinforcing steel bars can be oxidized and weakened by the permeation of water, oxygen, carbon dioxide and chloride ions.…”

Section: Introductionmentioning

confidence: 99%

“…Sustainability 2021, 13, x FOR PEER REVIEW 2 of 38 concrete performance in the long-term is decided by the environment wherein concrete structures are placed [2]. Reinforcing steel bars can be oxidized and weakened by the permeation of water, oxygen, carbon dioxide and chloride ions.…”

Section: Introductionmentioning

confidence: 99%

Smart Bio-Agents-Activated Sustainable Self-Healing Cementitious Materials: An All-Inclusive Overview on Progress, Benefits and Challenges

et al. 2022

Self Cite

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Cementitious materials deteriorate progressively with the formation of cracks that occur due to diverse physical, chemical, thermal, and biological processes. Numerous strategies have been adopted to obtain cement-based self-healing materials and determine the novel self-healing mechanisms. The uses of microbes have been established to improve the thickness of the healed crack and mechanical properties of the concrete, a phenomenon seldom addressed in the literature. Based on these factors, this article comprehensively appraises the smart bio-agents-based autonomous healing performance of concrete to demonstrate the recent progress, expected benefits, and ongoing challenges. The fundamentals, design strategies, and efficacy of the smart bio-agents-activated self-healing cementitious materials are the recurring themes of this overview. Furthermore, the effects of various processing parameters on the performance of cementitious self-healing smart bio-agents are discussed in-depth. The achievements, knowledge gaps, and needs for future research in this ever-evolving area for the sustainability and resilience of the built environment are highlighted.

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Enduring performance of alkali-activated mortars with metakaolin as granulated blast furnace slag replacement

Cited by 9 publications

References 68 publications

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Smart Bio-Agents-Activated Sustainable Self-Healing Cementitious Materials: An All-Inclusive Overview on Progress, Benefits and Challenges

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