Evaluarea liantilor geopolimerici activati alcalin ca alternativa la cimentul Portland

Faris, Meor Ahmad; Abdullah, Mohd Mustafa Al Bakri; Sandu, Andrei Victor; Nizar, Ismail Khairul; Moga, Ligia; Neculai, Oana; Muniandy, Ratnasamy

doi:10.37358/mp.17.1.4806

Cited by 22 publications

(6 citation statements)

References 56 publications

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“…Other researchers detected similar relations and they concluded that alkali concentration can be considered as one of the main parameters in the contribution to the mechanical properties of alkali-activated materials. A high level of calcium compounds can affect the geo-polymerization process and cause deterioration of the samples' microstructure [60,61]. The mortars with mixed activators -NaOH with sodium silicate (N5-S22) and NaOH with CaO (N5-C10) -induced the highest flexural strengths among all combined activated materials.…”

Section: Flexural and Compressive Strengthsmentioning

confidence: 99%

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

et al. 2020

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The aim of this work was to study the influence of the type of activator on the formulation of modified fly ash based geopolymer mortars. Geopolymer and alkali-activated materials (AAM) were made from fly ashes derived from coal and biomass combustion in thermal power plants. Basic activators (NaOH, CaO, and Na2SiO3) were mixed with fly ashes in order to develop binding properties other than those resulting from the use of Portland cement. The results showed that the mortars with 5 mol/dm3 of NaOH and 100 g of Na2SiO3 (N5-S22) gave a greater compressive strength than other mixes. The compressive strengths of analyzed fly ash mortars with activators N5-S22 and N5-C10 (5 mol/dm3 NaOH and 10% CaO) varied from 14.3 MPa to 5.9 MPa. The better properties of alkali-activated mortars with regular fly ash were influenced by a larger amount of amorphous silica and alumina phases. Scanning electron microscopy and calorimetry analysis provided a better understanding of the observed mechanisms.

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Section: Flexural and Compressive Strengthsmentioning

confidence: 99%

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

et al. 2020

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“…In this study, fineness size particle (63µm) contains high specific surface area and expected to consume much quantity of water as BA is known to be porous material. Porosity of BA in Portland cement increases and its required high demand of water during cementation process [21,22]. Due to high porosity of BA, results on lower density and higher porosity relative to control mortar will achieved.…”

Section: Densitymentioning

confidence: 99%

Mechanism of Cement Paste with Different Particle Sizes of Bottom Ash as Partial Replacement in Portland Cement

Jun¹,

Minciună²,

Abdullah³

et al. 2017

Rev. Chim.

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Manufacturing of Portland cement consists of high volume of natural aggregates which depleted rapidly in today construction field. New substitutable material such as bottom ash replace and target for comparable properties with hydraulic or pozzolanic properties as Portland cement. This study investigates the replacement of different sizes of bottom ash into Portland cement by reducing the content of Portland cement and examined the mechanism between bottom ash (BA) and Portland cement. A cement composite developed by 10% replacement with 1, 7, 14, and 28 days of curing and exhibited excellent mechanical strength on day 28 (34.23 MPa) with 63 mm BA. The porous structure of BA results in lower density as the fineness particles size contains high specific surface area and consume high quantity of water. The morphology, mineralogical, and ternary phase analysis showed that pozzolanic reaction of bottom ash does not alter but complements and integrates the cement hydration process which facilitate effectively the potential of bottom ash to act as construction material.

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“…Numerous studies on alkali-activated concrete have been conducted, but there is still no agreement on the effect of various parameters on the properties of alkali-activated materials. For alkali-activated concrete, the most essential parameters are the aluminosilicate supply, curing conditions, type and concentration of alkaline activator, and alkali activator to base ratio [20][21][22]. NaOH and Na2SiO3 are frequently utilized to activate when making alkali-activated concrete [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of sodium oxide content on the durability of alkali-activated mortar utilizing botswana copper mine tailings and fly ash

Sannoh

Malumbela²,

Gilayeneh³

2022

MATEC Web Conf.

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This investigation aims to provide experimental data on the performance of alkali-activated mortar made of copper mine tailings (CMT) and fly ash (FA) exposed to acid-sulphate attacks and elevated temperature environments as a measure of durability. FA was used as a replacement material, substituting 20 to 40% of the CMT by mass, and sodium hydroxide was the alkaline activator, which was added in terms of Na2O content by mass of the total binder at 5%, 10%, and 15%. The durability performance of alkali-activated mortar was evaluated against 5 % and 10% concentrations of sulphuric and hydrochloric acids, and magnesium and sodium sulphates up to 180 days of exposure, as well as elevated temperature environment. The specimens were first visually examined, and weight change was measured before being exposed to an elevated temperature environment and the residual compressive strength was measured. It was observed that Na2O content and elevated temperature environment influence the residual compressive strength of alkali-activated mortar. Increasing the Na2O content for all CMT-FA-based mortar samples performed well in sulphates and acids mediums in terms of durability, but with a slight reduction in its durability performance in terms of residual compressive strength. However, these effects were more profound in samples exposed to acids, particularly those with lower FA replacement levels and sodium oxide content. For the high-temperature exposure, the residual compressive strength of all CMT-FA samples was much higher than the initial values. The findings also revealed that the partial replacement of CMT by FA significantly improved the residual compressive strength in terms of the durability performance of the alkali-activated mortar

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Evaluarea liantilor geopolimerici activati alcalin ca alternativa la cimentul Portland

Cited by 22 publications

References 56 publications

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

Mechanism of Cement Paste with Different Particle Sizes of Bottom Ash as Partial Replacement in Portland Cement

Effects of sodium oxide content on the durability of alkali-activated mortar utilizing botswana copper mine tailings and fly ash

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