Performance of cementitious and slag-fly ash blended geopolymer screed composites: A comparative study

Hwalla, Joud; El-Hassan, Hilal; Assaad, Joseph J.; El‐Maaddawy, Tamer

doi:10.1016/j.cscm.2023.e02037

Cited by 6 publications

(9 citation statements)

References 76 publications

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“…Crushed limestone, with a maximum particle size of 9.5 mm, served as the combined aggregates (fine and coarse). They were particularly selected due to their local abundances and superior mechanical and durability properties compared to other aggregates, such as dune and river sands [11,34]. Figure 1 shows the particle size distribution of the crushed limestone aggregates, with 95% of the particles possessing a size below 4.5 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Grade N sodium silicate (SS) and sodium hydroxide (SH) solutions were used to formulate the alkaline activator solution (AAS). The SH solid flakes (98% purity) were mixed with tap water to formulate an SH solution with 8 M. Such molarity was selected to produce the alkali-activated slag mixes with sufficient setting time for CMB production [11,35]. Indeed, previous work stated that decreasing SH molarity from 14 to 8 M increased the workability and setting time of alkali-activated materials [36,37].…”

Section: Methodsmentioning

confidence: 99%

“…These values were selected to ensure adequate mechanical performance while creating a porous microstructure to allow CO 2 penetration [7,11,18].…”

Section: Designmentioning

confidence: 99%

“…Recycling these by-products rather than disposing of them in stockpiles or landfills is crucial in reducing environmental pollution. With higher mechanical and durability properties than cement-based counterparts, geopolymers, and alkali-activated materials have proven to be excellent candidates for construction applications [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Of these various applications, geopolymers may be used as the main binder in concrete masonry blocks (CMBs), as they provide fast setting times [11] and early strength gains [13], thereby helping in accelerating the production and use of CMB. Such blocks are extensively produced and used by the construction and building sector as loading and non-loading insulating walls.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

Hwalla,

Al-Mazrouei,

Al-Karbi

et al. 2023

Sustainability

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This study investigates the effect of accelerated carbonation curing on the carbon sequestration potential, performance, and microstructure of alkali-activated slag mixes representing concrete masonry blocks (CMBs). The carbonation curing process parameters varied, including initial curing duration, carbonation curing duration, and carbonation pressure. Research findings showed that a maximum CO2 uptake of 12.8%, by binder mass, was attained upon exposing concrete to 4 h initial curing and 20 h carbonation curing at a pressure of 5 bars. The compressive strength and water absorption capacity improved with longer initial and carbonation curing durations and higher pressure. Upon subjecting to salt attack, the mass and strength of 28-day concrete samples increased, owing to the formation of Friedel’s salt and Halite. All mixes could be used as non-load-bearing CMB, with a 1-day strength greater than 4.1 MPa. Based on the global warming potential index, the carbon footprint of carbonation-cured, alkali-activated slag concrete masonry units was up to 46% lower than non-carbonation-cured counterparts. Research findings offer valuable information on the production of carbonation-cured, cement-free concrete masonry blocks to replenish natural resources, recycle industrial waste, and mitigate CO2 emissions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…These values were selected to ensure adequate mechanical performance while creating a porous microstructure to allow CO 2 penetration [7,11,18].…”

Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

Hwalla,

Al-Mazrouei,

Al-Karbi

et al. 2023

Sustainability

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Life Cycle Assessment of the Production of Concrete Masonry Units in the United Arab Emirates

Alzard,

El-Hassan,

Najm

2024

Environment and Sustainable Development

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A comparative study of the behavior of engineered cementitious composites and engineered geopolymer composites containing metakaolin and magnetized water

Keshta,

Eltawil,

Elshikh

et al. 2024

Innov. Infrastruct. Solut.

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Sustainable materials and technologies used in engineered cementitious composites (ECC) and engineered geopolymer composites (EGC) have gained significant attention from concrete researchers in recent decades, owing to their superior performance compared to traditional concrete. In this study, the performance of sustainable ECC and EGC made of metakaolin (MK) and magnetized water (MW) is evaluated and compared. This was carried out using 14 mixes (7 for ECC and 7 for EGC). The control ECC mix contained cement and ground granulated blast furnace slag (GGBFS) and the control EGC mix contained fly ash (FA) and GGBFS. In ECC, the cement and GGBFS were partially replaced by MK; and in EGC, the FA and GGBFS were replaced by MK. The replacement ratios were 20%, 40%, 60%, and 80% by volume. The tap water (TW) was completely replaced by MW in ECC and EGC mixes containing 0% and 20% MK. Fresh, mechanical, and durability properties were measured for both ECC and EGC such as; slump, compressive and flexural strength, water absorption, and sorptivity. The effect of different curing environments (tap water and seawater) on ECC/EGC compressive strength was also studies. Furthermore, microstructural analyses were performed on specific ECC and EGC mixtures. The microstructure analyses included scanning electronic microscope (SEM), energy dispersive X-ray (EDX), and mapping of the morphology surface. The fresh and mechanical properties indicated that EGC exhibited higher slump values (by up to 7.3 times) and higher compressive strengths (by up to 90%) than those of ECC, especially in the presence of MW. Seawater curing enhanced the EGC compressive strength by up to 16%. The durability results showed that absorption rates and sorptivity of EGC were relatively higher than those of the corresponding ECC. The SEM analysis showed that the concentration of gelatinous materials as CSH and ASG in the mixes using MW was higher than the similar mixes with made with TW, especially in the presence of MK. The EDX analysis and mapping showed that the ratio of Ca/Si was low in EGC compared to that in ECC.

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Performance of cementitious and slag-fly ash blended geopolymer screed composites: A comparative study

Cited by 6 publications

References 76 publications

Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

Life Cycle Assessment of the Production of Concrete Masonry Units in the United Arab Emirates

A comparative study of the behavior of engineered cementitious composites and engineered geopolymer composites containing metakaolin and magnetized water

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