Pumice as Precursor in Geopolymer Paste and Mortar

Kabay, Nihat; Mert, Mumin; Miyan, Nausad; Ömür, Tarık

doi:10.32732/jcec.2021.10.4.225

Cited by 11 publications

(3 citation statements)

References 43 publications

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“…Pumice stone is used in the construction industry as a lightweight aggregate, and the powder is often used as a partial cement replacement due to its pozzolanic properties [36]. In geopolymer development, pumice stone is used in its powdery form (pumice powder-PP) as either a partial replacement of another precursor-based geopolymer or as the main precursor material due to its richness in Al and Si content [37,38]. Nematollahi et al [39] confirmed the feasibility of a one-part FA geopolymer activated with NaOH and Na 2 SiO 3 in the powder form and obtained a compressive strength of 29 N/mm 2 , which was comparable to the two-part formulation when NaOH and Na 2 SiO 3 alkaline solutions were employed as the activators.…”

Section: Introductionmentioning

confidence: 99%

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

Oti,

Adeleke,

Anowie

et al. 2024

Materials

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

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Section: Introductionmentioning

confidence: 99%

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

Oti,

Adeleke,

Anowie

et al. 2024

Materials

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“…Raw materials or precursors, activator/activator solution, particle size, calcination temperature, or thermal treatment and processing are all important factors that can influence geopolymer properties [29][30][31][32]. Furthermore, the outcomes of the compressive testing of binder materials are critical because they are the primary parameters used to evaluate the quality of the test object.…”

Section: Introductionmentioning

confidence: 99%

Compressive Test and Microstructure Analysis of the Coconut Fiber Ash-based Geopolymer Binder

Widnyana¹,

Salain²,

Sutarja³

et al. 2023

cea

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This watchfulness goal is to define the compressive test value and microstructure of a geopolymer binder made from coconut fiber ash (CFA). CFA comes from the combustion of coconut fibers in the tile-making industry in Tabanan, Bali. This waste is processed into CFA, which consists of 8.24% silicon dioxide, 70.6% potassium oxide, 14.1% chlorine, 2.3% diphosphate pentoxide, and 2.25% iron dioxide. CFA is then used as a crude material for the manufacture of geopolymer binders. The mixture's proportion consisted of three groups of variations: the ratio of precursors and activators, P/A: 70%:30%; 75%:25%; and 80%:20%. In the experiment, Na 2 SiO 3 and a 14 M molar concentration of NaOH were combined in weight ratios of 1:1, 1.5:1, and 2:1. These are both alkaline activators. The sample was shaped into 50-mm cubes, dried in an 80°C heater for 24 hours, and then tested at 7 and 28 days. The ASTM-C39 standard was used for the compression test, while the microstructural analysis used X-RD and SEM-EDX. The results showed that coconut fiber ash precursors could be used to generate a geopolymer binder with a compressive value of 4.67 MPa and 6.24 MPa on the 7 th and 28 th days of testing, respectively. The microstructure of the solid sample, which was associated with the rise in compressive value, was characterized using scanning electron microscopy. Using 80% CFA gave the best results.

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“…Concrete is the most widely utilized material in the construction industry throughout the world [1,2]. Cement, natural sand, coarse aggregate, and water are the major ingredients of concrete.…”

Section: Introductionmentioning

confidence: 99%

Properties of Cold-Bonded and Sintered Aggregate Using Washing Aggregate Sludge and Their Incorporation in Concrete: A Promising Material

2022

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The aggregate makes up about 65–75% of the total volume of concrete and the use of artificial aggregates manufactured from waste and by-product materials, as an alternative to natural aggregate, has attracted considerable research interest. Washing aggregate sludge (WAS) is obtained as a waste during the process of washing the aggregates, which is disposed or used as landfill. The utilization of WAS as a major component to manufacture artificial aggregates remains unexplored. Therefore, the focus has been directed towards the production of cold-bonded and sintered aggregates using WAS and their incorporation in concrete. The fresh pellets were manufactured using WAS, ground granulated blast furnace slag (GGBFS) and ordinary Portland cement (OPC) and kept in the laboratory conditions at 20 ± 2 °C and 95 ± 5% relative humidity to obtain cold-bonded aggregates, whereas WAS and GGBFS were utilized to manufacture sintered aggregate by heating the fresh pellets up to 1150 °C. The manufactured aggregate properties were characterized through physical, mechanical, chemical, and microstructural analysis. Concrete specimens were also produced by introducing the artificial aggregates in replacement with the coarse aggregate. The results showed that the concrete containing artificial aggregates can be produced with lower oven-dry density and comparable mechanical properties to efficiently utilize WAS.

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Pumice as Precursor in Geopolymer Paste and Mortar

Cited by 11 publications

References 43 publications

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

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

Compressive Test and Microstructure Analysis of the Coconut Fiber Ash-based Geopolymer Binder

Properties of Cold-Bonded and Sintered Aggregate Using Washing Aggregate Sludge and Their Incorporation in Concrete: A Promising Material

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