A Comprehensive Performance Evaluation of GGBS-Based Geopolymer Concrete Activated by a Rice Husk Ash-Synthesised Sodium Silicate Solution and Sodium Hydroxide

Recycling, Journal Year: 2024, Volume and Issue: 9(2), P. 23 - 23

Published: March 14, 2024

Commercial sodium hydroxide (NaOH) and silicate (SS) are commonly used as alkaline activators in geopolymer concrete production despite concerns about their availability associated CO2 emissions. This study employs an alternative activator (AA) synthesized from a (SSA) solution derived rice husk ash (RHA) 10 M solution. The initial phase established optimal water-to-binder (W/B) ratio of 0.50, balancing workability structural performance. Subsequent investigations explored the influence alkali/precursor (A/P) on properties. A control mix uses ordinary Portland cement (OPC), while ground granulated blast-furnace slag (GGBS)-based concrete—GPC mixes (GPC1, GPC2, GPC3, GPC4) vary A/P ratios (0.2, 0.4, 0.6, 0.8) with 1:1 to (SS: SH). engineering performance was evaluated through slump test, unconfined compressive strength (UCS) tensile splitting (TS) tests accordance appropriate standards. mixes, excluding offer suitable workability; UCS TS, though lower than mix, peak at 0.4. Despite mechanical OPC, geopolymers’ environmental benefits make them valuable alternative. 0.4 0.5 W/B (water binder) ratio, is recommended for balanced Future research should focus enhancing properties sustainable, high-performance mixtures.

Language: Английский

---

3D printing of alkali-activated geopolymers for sustainable and circular economy advancements

Circular Economy, Journal Year: 2024, Volume and Issue: 3(3), P. 100101 - 100101

Published: Aug. 23, 2024

The urgent global challenges of climate change and resource overconsumption highlight the need for sustainable innovations in construction industry. Ordinary portland cement, a vital material, significantly contributes to carbon emissions. Alkali-activated materials have emerged as promising alternatives. Three-dimensional printing (3DP) has gained attention construction, because it offers efficiency sustainability benefits. This study addresses integration alkali-activated 3DP, focusing on circular economy implications. examines 1,200 research articles from Scopus database comprehensively reviews 47 3DP geopolymer structures. identifies critical gaps, including lack focus materials, models, optimal mixtures, anisotropy mitigation, reinforcement strategies, scalability. These insights transformative potential with fostering economy.

Language: Английский

---

A comprehensive review of the fresh and hardened characteristics of self-compacting geopolymer concrete

Journal of Sustainable Cement-Based Materials, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 20

Published: Feb. 12, 2025

Language: Английский

---

Understanding the Effect of Waiting for the Dissolution of Sodium Hydroxide in Geopolymer Concrete Mixes

Materials, Journal Year: 2025, Volume and Issue: 18(4), P. 849 - 849

Published: Feb. 15, 2025

Geopolymer concrete (GPC) can be produced by the chemical activation of industrial by-products and processed natural minerals that contain aluminosilicates with presence an alkaline activator. Raw components are one critical parameters affecting geopolymer performance. On other hand, mixing procedure is not any less important. Few demonstrative constructions have been built using GPC as a greener alternative to Portland cement concrete. Numerous variables affect manufacture, such raw material specification, activator type dosage, curing regimes. Despite conventions building industry, lack proper mix design methods limits wide acceptance in industry. This report conducted experimental trials on GGBS-based optimize achieve best mechanical strength structural integrity. properties were evaluated through slump unconfined compressive tests. The laboratory this revealed all mixes, except SD0HV 1W-SG, exhibited high workability values. Also, was vital attain satisfactory could used when cooled reached room temperature after two hours preparation necessary 24 h. Mix G-(0.5W-S) 0.5A.A. (alkaline activator)/precursor (GGBS) ratio, SSA (sodium silicate alternative)/SH hydroxide 10 M molarity) ratio 1:1, 0.55 W/B (water binder) recommended performance

Language: Английский

---

Mechanical Properties of a Sustainable Low-Carbon Geopolymer Concrete Using a Pumice-Derived Sodium Silicate Solution

Materials, Journal Year: 2024, Volume and Issue: 17(8), P. 1792 - 1792

Published: April 13, 2024

A geopolymer is an inorganic amorphous cementitious material, emerging as alternative sustainable binder for greener concrete production over Ordinary Portland Cement (OPC). Geopolymer promotes waste reuse since the applicable precursor materials include agricultural and industrial that requires disposal, helping to reduce in landfills ensuring environmental protection. This study investigates development of environmentally friendly sodium silicate (SSA) derived from pumice powder (PP) place a commercial Na2SiO3 solution at 10 M concentration. Six batches were produced alkaline/precursor (A/P) ratios 0.1, 0.2, 0.3, 0.4, 0.5. The mix AF4, with A/P ratio became optimum design; however, it recorded lower compressive, tensile splitting, flexural strengths, respectively, against control OPC concrete. formulations, obtained 28-day-hardened densities comparable 28-day compressive strength was 29.4 MPa, higher than 18.8 MPa AF4. However, 56-day AF4 improved 22.4 around 19% increase compared 30.8 achieved by on day 56, having experienced only 5% increase. low mechanical performances formulation could be attributed extra water added original design improve workability mix. Therefore, SSA alkaline using PP showed some potential developing low-strength construction applications.

Language: Английский

---

Sustainable utilization of sodium silicate-based lead glass sludge as an alkali-activator for alkali-activated slag: Performance, characterization, and Pb-stabilization

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 434, P. 136681 - 136681

Published: May 28, 2024

Language: Английский

---

Geopolymer Antimicrobial and Hydrophobic Modifications: A Review

Ceramics, Journal Year: 2023, Volume and Issue: 6(3), P. 1749 - 1764

Published: Aug. 11, 2023

The article summarizes the state of art in increasing antimicrobial activity and hydrophobic properties geopolymer materials. Geopolymers are inorganic polymers formed by polycondensation aluminosilicate precursors an alkaline environment considered a viable alternative to ordinary Portland cement-based materials, due their improved mechanical properties, resistance chemicals, high temperature, lower carbon footprint. Like concrete, they susceptible microbially induced deterioration (corrosion), especially humid environment, primarily surface colonization sulphur-oxidizing bacteria. This paper reviews various methods for or protection method critical analysis literature results discussed, along with potential applications geopolymers properties. Metal nanoparticles, despite risks, PDMS epoxy coatings, most investigated effective materials protection. Additionally, future prospects, challenges research against degradation presented discussed.

Language: Английский

---

Enhanced approach for geopolymer mix-design and performance evaluation: Integrating hybrid Taguchi-GRA-PCA for improved properties and behavioral insights

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 433, P. 136701 - 136701

Published: May 23, 2024

Language: Английский

---

The Influence of Molarity Activity on the Green and Mechanical Properties of Geopolymer Concrete

Construction Materials, Journal Year: 2025, Volume and Issue: 5(1), P. 16 - 16

Published: March 17, 2025

The usage of geopolymer-based materials (GPBMs) in concrete structures has been broadly promoted by the current construction sector. GPBMs have an outstanding influence on enhancing mechanical properties. Geopolymers (GPs) also a potential impact reducing carbon dioxide emissions emitted cement production procedure. Therefore, this paper aims to evaluate some variables that affect green and properties fly ash-based geopolymer concretes (FA–GPCs), i.e., different silica fume (SF) contents, alkaline activator solution (AAS) percentages, sodium silicate-to-sodium hydroxide (SS/SH) ratios, (NaOH) molarity, additional water. A slump test was used workability assess designed ash-geopolymer mixes (FA–GPCMs). 14- 28-day compressive strengths were concrete’s Results indicate prepared FA–GPCMs reduced with improving SF content (5% 30%), SS/SH ratio (1% 3%), NaOH molarity (10 M 16 M), while percentages 35% resulted decrease FA–GPCMs’ workability. Also, increasing replacement from 5% 15% significant FA–GP strength enhancements compared FA–GPCM produced 0% SF, contents 20%, 25%, 30% led decline FA–GPC G1–SF15%.

Language: Английский

---

Utilization of a PFA-GGBS-Based Precursor in Geopolymer Concrete Production as a Sustainable Substitute for Conventional Concrete

Materials, Journal Year: 2025, Volume and Issue: 18(6), P. 1309 - 1309

Published: March 16, 2025

Awareness of environmental sustainability is driving the shift from conventional Portland cement, a major contributor to carbon dioxide emissions, more sustainable alternatives. This study focuses on developing geopolymer concrete by optimizing mixtures with various ratios Ground Granulated Blast Furnace Slag (GGBS) and pulverized fly ash (PFA) as precursors, aiming find mix that maximizes strength while minimizing impacts. The precursor was activated using laboratory-synthesized silica fume (SF)-derived sodium silicate solution in combination NaOH at molarity 10M. aims optimal 0.55 water-to-binder ratio, 0.40 alkali-to-precursor 1:1 hydroxide ratio. Ordinary cement used control binder (C), mixes included varying GGBS-PFA compositions [CL0 (50% GGBS—50% PFA), CL1 (60% GGBS—40% CL2 (70% GGBS—30% CL3 (80% GGBS—20% CL4 (90% GGBS—10% PFA)]. engineering performance assessed slump, unconfined compressive strength, split tensile, flexural tests accordance their relevant standards. Observations showed GPC specimens exhibited similar or slightly higher values than PC. In addition geopolymers have smaller footprint, consuming less energy reducing greenhouse gas emissions. These qualities make construction option aligns global efforts reduce emissions conserve resources.

Language: Английский

---