Performance of Steel Fiber-Reinforced Alkali-Activated Slag-Fly Ash Blended Concrete Incorporating Recycled Concrete Aggregates and Dune Sand

El-Hassan, Hilal; Hussein, Abdalla; Medljy, Jamal; El‐Maaddawy, Tamer

doi:10.3390/buildings11080327

Cited by 28 publications

(20 citation statements)

References 80 publications

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“…As shown in the last column of Table 5, the addition of steel fibers, cement, slag, microsilica, or fly ash and the variations in the specific gravities of NA and RA caused negligible changes in the volume of the mix. Other work reported such negligible changes in the volume [34,[66][67][68][69][70].…”

Section: Concrete Mixture Proportioningmentioning

confidence: 89%

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

2021

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This paper studies the potential environmental and economic impact of replacing natural aggregates (NA) with recycled aggregates (RA) in the production of different sustainable concrete mixes in the United Arab Emirates (UAE). A life cycle assessment (LCA) was carried out according to the methodology proposed by the international standards of the series ISO 14040. The performance of concrete mixes having a similar design compressive strength was evaluated. Results showed that the inclusion of steel fibers (SF) led to an increase in the global warming potential (GWP), whereas mixes with cement replacement by fly ash, slag, or microsilica recorded a reduction in GWP. Furthermore, SF-reinforced mixes created with 100% RA were at least three times more expensive than the NA-based control mix, while the cost of those with cement replacement by mineral additives was generally similar to that of the control. Material transportation was found to be a main contributor to the environmental and economic impacts, only second to cement, and its contribution increased with longer distances and steel fiber incorporation and decreased with RA replacement. To integrate these individual measures and select optimum mixes for various applications, multifunctional performance indices were developed. Research findings highlight the possibility to fully replace NA with RA (100%) while maintaining the performance and improving the economic and environmental impacts of concrete produced in the UAE.

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Section: Concrete Mixture Proportioningmentioning

confidence: 89%

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

2021

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“…This explains the high number of publications investigating the use of RA as a replacement for NA. Nevertheless, the replacement of NA by RA in concrete decreased the mechanical properties due to its low density and high porosity, coupled with the weak transition zone between RA and cement paste [33,[50][51][52][53][54][55]. Indeed, RA has adverse effects on most concrete strengths except impact resistance [56].…”

Section: Alternative Materialsmentioning

confidence: 99%

“…Out of the 13 effect sizes for porosity and permeability, 9 and 10 positive effect sizes were obtained, respectively, indicating a general improvement in this performance with aggregate replacement. The replaced aggregates are more porous than NA, thus producing a more porous and permeable PC [50,52,55]. However, such an increase in hydraulic performance was not necessarily associated with a decrease in mechanical properties.…”

Section: Performance Evaluationmentioning

confidence: 99%

Meta-Analysis of the Performance of Pervious Concrete with Cement and Aggregate Replacements

et al. 2022

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In recent years, pervious concrete (PC) has gained much attention as one of the strategies for low-impact development (LID) in pavements due to its structural, economic, and road-user benefits. This study sought to review and evaluate changes in the mechanical, hydraulic, and durability performance of PC produced with cement and aggregate replacements. A meta-analysis was conducted to elucidate the feasible range of the replacement percentage and the number of materials that could be used to replace cement and aggregates; single or binary replacements were considered. Results indicated that cement-replacing materials, industrial wastes (IWA), and recycled aggregates (RA) met the minimum requirement for the mechanical, hydraulic, and durability properties of PC. The use of a single cement replacement material provided PC with better performance than when cement was replaced with two or more materials or when cement alone was used. Industrial waste was found to be a better replacement to aggregates than RA. The combined replacement of cement and aggregates with IWA and other cement-replacing materials was the most effective method for improving the mechanical, hydraulic, and durability performance of PC. Replacements of up to 40% was considered viable for cement replacement, while up to 50% replacement was considered practical for aggregate and combined replacement. PC incorporating different cement-replacing materials exhibited equivalent or improved mechanical properties and maintained hydraulic performance compared to cement-based PC. Nonetheless, limited studies are available on the durability performance of PC made with cement and/or replacements. Thus, the durability of PC coupled with the applicability of replacement materials acquired from different locations need to be evaluated to address the viability of producing more durable PC with the use of replacements.

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“…As summarized in Table 2, the factors included the BFS replacement by DDF (25-75%), AAS-to-binder ratio or AAS/B (0.5-0.6), SS/SH ratio (1.0-2.0), and SH molarity (6-14 M). These levels were selected through preliminary trials and based on typical values in geopolymer mixes [11,15,29]. Mixes made with DDF replacement of 100% resulted in a compressive strength below 5 MPa, while those made with higher or lower AAS/B, SS/SH, and SH molarity either experienced flash setting or did not set within 24 h. Hence, an L9 orthogonal array was used to develop the experimental matrix by considering all levels and factors to the equivalent location in the matrix, resulting in nine DDF-BFS blended geopolymer mortar mixes.…”

Section: Development Of Geopolymer Mortar Mixturesmentioning

confidence: 99%

“…Desert dune sand has been used as an essential material in the construction industry [12,13]. Current literature converges that dune sand can be usefully employed as fine aggregates in concrete production [14,15]. This dune sand can be further treated to obtain ultrafine particles of desert dune fines (DDF).…”

Section: Introductionmentioning

confidence: 99%

Development and Optimization of Geopolymers Made with Desert Dune Sand and Blast Furnace Slag

et al. 2022

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This study assesses the effect of mix design parameters on the fresh and hardened properties, cost, and carbon footprint of geopolymer mortar made with desert dune fines (DDF) and blast furnace slag (BFS). Taguchi method was employed in designing the experiments. Four factors were considered, each having three levels, leading to a total of nine geopolymer mortar mixes. The factors comprised the DDF replacement percentage, alkali-activator solution to binder ratio (AAS/B), sodium silicate-to-sodium hydroxide ratio (SS/SH), and sodium hydroxide (SH) molarity. Ten performance criteria were evaluated, including the flowability, final setting time, hardened density, 1, 7, and 28-day compressive strengths, water absorption, sorptivity, cost, and carbon footprint. ANOVA was carried out to estimate the contribution of each factor towards the response criteria. Further, TOPSIS analysis was utilized to optimize the mixture proportions of DDF-BFS blended geopolymer mortar. Experimental results showed that up to 25% DDF replacement enhanced the density, strength, and durability of the geopolymers with minor impact on the flowability and setting time. Higher replacement percentages had a detrimental impact on the performance but could still be utilized in specific mortar construction applications. The other factors had more limited contributions to the performance, evidenced by the ANOVA. TOPSIS method revealed the optimum mix to be made with DDF replacement of 25%, AAS/B of 0.5, SS/SH of 1.5, and SH molarity of 10 M. Different multivariable regression models were also developed to predict the fresh and hardened properties of the DDF-BFS geopolymer mortars using the mix design parameters.

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Performance of Steel Fiber-Reinforced Alkali-Activated Slag-Fly Ash Blended Concrete Incorporating Recycled Concrete Aggregates and Dune Sand

Cited by 28 publications

References 80 publications

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

Meta-Analysis of the Performance of Pervious Concrete with Cement and Aggregate Replacements

Development and Optimization of Geopolymers Made with Desert Dune Sand and Blast Furnace Slag

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