Valorization of waste perlite powder in geopolymer composites

El-Mir, Abdulkader; Hwalla, Joud; El-Hassan, Hilal; Assaad, Joseph J.; El-Dieb, Amr; Shehab, Ehab

doi:10.1016/j.conbuildmat.2023.130491

Cited by 23 publications

(9 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Slag was selected as the sole binder in this study due to its high calcium oxide content and calcium-rich reaction products, which readily reacted with CO 2 gas to produce various carbonation products [9,27,31]. Indeed, previous studies found that the microstructures of alkali-activated slag materials were richer in calcium-based gels, such as calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) gels, compared to those of fly ash-or perlite-based geopolymer concrete [32,33]. Crushed limestone, with a maximum particle size of 9.5 mm, served as the combined aggregates (fine and coarse).…”

Section: Methodsmentioning

confidence: 99%

“…After the accelerated carbonation curing process, phenolphthalein solution was used to assess the average carbonation depth and identify the carbonated and uncarbonated regions of the carbonated and hydrated samples. Indeed, phenolphthalein is a pH indicator that turns pink-fuchsia when the pH is above 10 and colourless when the pH falls below 8.3 [32]. After the solution was sprayed on the freshly cut surfaces of the 28-day specimens, it would turn violet/pink if the surface were uncarbonated, whereas it would remain colorless if it were in contact with a carbonated surface.…”

Section: Performance Evaluationmentioning

confidence: 99%

See 1 more Smart Citation

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

Hwalla,

Al-Mazrouei,

Al-Karbi

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Performance Evaluationmentioning

confidence: 99%

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

Hwalla,

Al-Mazrouei,

Al-Karbi

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, in recent material engineering research, a range of cutting-edge multicriteria performance optimization techniques have been embraced to identify the optimal solution [30,31]. The TOPSIS method was chosen in this study to optimize the SLC mixtures and ensure the best output from the experimental results of mechanical and durability properties [29,32]. When dealing with multi-response optimization problems, TOPSIS is a multi-criteria decision-making technique that assesses options based on multiple criteria and then ranks them according to their similarity to the ideal solution [58].…”

Section: Topsis Optimizationmentioning

confidence: 99%

“…Although the Taguchi method has been effective in determining the required performance criteria while minimizing the number of developed mixtures, it is incapable of considering multiple criteria concurrently. As such, multicriteria optimization methods, such as the technique for order of preference by similarity to the ideal solution (TOPSIS), have been successful in finding the optimal scenarios for designing engineering materials while considering various operation criteria and saving testing costs and time [31][32][33]. Despite the effectiveness of these methods, no research has yet explored the optimization and performance of lightweight concrete incorporating EPS as an aggregate material.…”

Section: Introductionmentioning

confidence: 99%

Multi-Response Optimization of Semi-Lightweight Concrete Incorporating Expanded Polystyrene Beads

El-Mir,

Fayad,

Assaad

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

The utilization of expanded polystyrene (EPS) beads in semi-lightweight concrete (SLC) intended for repair and building applications has gained great attention in recent years. This study examines the effect of mix design parameters including binder content, water-to-binder ratio (w/b), EPS content, and silica fume (SF) additions on the mechanical properties and durability of SLC mixtures. The experimental program was carried out following the Taguchi approach for four parameters, each having three levels, to produce an L9 orthogonal array. The performance criteria under investigation were the superplasticizer demand, density, compressive strength, splitting tensile strength, ultrasonic pulse velocity, water absorption, sorptivity, and abrasion resistance. Test results showed that the w/b and EPS content were the most contributing parameters that altered the SLCs performance. The multi-response optimization method (TOPSIS) revealed that superior performance could be achieved using a binder content of 375 kg/m3, a w/b of 0.45, an EPS content of 3 kg/m3, and a SF replacement rate of 8%. The mix design parameters were utilized to create multivariate regression models to predict the SLCs mechanical and durability properties. Such data can be of particular benefit to engineers seeking the use of lightweight materials for sustainable construction with optimized durability and a reduced cement carbon footprint.

show abstract

“…MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions, or products referred to in the content. soda residue and oxalate acid [14], as well as the waste perlite powder [15]. Therefore, the multicomponent geopolymer consists of various solid wastes and is in full swing to pursue high-performance and multi-function cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Silica Fume Improves the Frost Resistance of Alkali-activated Slag/fly Ash Geopolymer Binder

Wang¹,

Liu²,

Mo³

et al. 2023

Preprint

View full text Add to dashboard Cite

Benign design of alkali-activated slag/FA geopolymer paste has intriguing increasing attention for optimizing its service performance. Therefore, the replacement of fly ash (FA) with 10 wt% silica fume (SF) is investigated by mechanical strength after freeze-thawing cycles and microstructure characterization. The results show that an appropriate dosage (30 wt%) of slag is necessary to attain alkali-activated slag/FA geopolymer paste with excellent mechanical performance, and the SF/slag/FA (SF: slag: FA= 10:30:60, wt%) geopolymer paste exerts the compressive and flexural strength of 95.2 and 3.2 MPa, respectively. Meanwhile, the doped 10 wt% SF facilitates the propagation of (N, C)-A–S–H chains, rather than the formation of C-S-H gels, evidenced by the absent exothermic peak at about 861oC from the differential scanning calorimetry (DSC) curves, leading to the increases in the pores volume with a pore diameter<20 nm and tortuosity by mercury intrusion porosimeter (MIP) results, corresponding to an improved freezing-thawing resistance with the residual compressive strength of 52.8 MPa and the weight loss of 10.5% after 300 freeze-thawing cycles. It explores a cost-effective and benign facile approach to designing heating curing-free alkali-activated slag/FA geopolymer paste with good freezing-thawing resistance.

show abstract

Valorization of waste perlite powder in geopolymer composites

Cited by 23 publications

References 67 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

Multi-Response Optimization of Semi-Lightweight Concrete Incorporating Expanded Polystyrene Beads

Silica Fume Improves the Frost Resistance of Alkali-activated Slag/fly Ash Geopolymer Binder

Contact Info

Product

Resources

About