Potential use of activated Algerian natural pozzolan powder as a cement replacement material

Nourredine, Goufi; Kerdal, D.; Kaid, Nouria; Idir, Rachida

doi:10.1080/19648189.2018.1559241

Cited by 9 publications

(7 citation statements)

References 47 publications

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“…An increase in the pozzolanic activity of VA can overcome the important disadvantage of low early strength gains in cement containing VA materials [ 66 , 70 ]. Thus, different pre-treatments have been used to increase the potential reactivity of VAs [ 43 , 49 , 50 , 51 , 71 , 72 ]. There are three types of pre-treatment: mechanical activation (MA), the thermal method via calcination and chemical activation methods.…”

Section: Treatments To Increase the Reactivity Of Natural Volcanicmentioning

confidence: 99%

“…In addition, when the semi-crystalline nature of the material is predominant, the VA has a deficiency in CaO and reactive Al 2 O 3 components. Consequently, in order to increase the reactivity of alkali-activated binders and produced cementitious construction materials with a higher mechanical properties, it is common to use a calcination process > 700 °C [ 8 , 49 , 72 , 79 ]. Bondar et al [ 43 ] concluded that calcination processes at 700, 800 and 900 °C positively influenced the mechanical properties of geopolymer pastes.…”

Section: Treatments To Increase the Reactivity Of Natural Volcanicmentioning

confidence: 99%

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Volcanic Ash as a Sustainable Binder Material: An Extensive Review

2021

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The construction industry is affected by the constant growth in the populations of urban areas. The demand for cement production has an increasing environmental impact, and there are urgent demands for alternative sustainable solutions. Volcanic ash (VA) is an abundant low-cost material that, because of its chemical composition and amorphous atomic structure, has been considered as a suitable material to replace Portland cement clinker for use as a binder in cement production. In the last decade, there has been interest in using alkali-activated VA material as an alternative material to replace ordinary Portland cement. In this way, a valuable product may be derived from a currently under-utilized material. Additionally, alkali-activated VA-based materials may be suitable for building applications because of their good densification behaviour, mechanical properties and low porosity. This article describes the most relevant findings from researchers around the world on the role of the chemical composition and mineral contents of VA on reactivity during the alkali-activation reaction; the effect of synthesis factors, which include the concentration of the alkaline activator, the solution-to-binder ratio and the curing conditions, on the properties of alkali-activated VA-based materials; and the mechanical performance and durability properties of these materials.

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Section: Treatments To Increase the Reactivity Of Natural Volcanicmentioning

confidence: 99%

Section: Treatments To Increase the Reactivity Of Natural Volcanicmentioning

confidence: 99%

Volcanic Ash as a Sustainable Binder Material: An Extensive Review

2021

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“…Dry activators NC, NS, and CaCl were used at 2% and 4% for binder weight. In addition, the CaCl activator was also used in 1 wt% [ 17 , 32 , 62 ]. Dry AA was adequately dissolved in water before being added to the dry binder for mortar production.…”

Section: Stage 1 MIX Proportions Results and Discussionmentioning

confidence: 99%

“…In contrast, the f cm strengths of the mortars produced with 2% NSi and 4% CaCl activators reduced the f cm strength values obtained with 1% NSi and 2% CaCl, respectively. This behaviour could be explained by an excess of Na + due to the high alkali concentration in the pore solution and also partly due to the relatively weak binding (and exchangeability) of Na + in the matrix, which remained unreacted in the mortar matrix and might have leached out [ 17 ].…”

Section: Stage 1 MIX Proportions Results and Discussionmentioning

confidence: 99%

“…Several studies have indicated that calcinating VA to at least 500 °C can alter its mineralogical structure, making it more amorphous and reactive [ 16 , 17 ]. Furthermore, this process removes organic matter from the VA as well as reducing its porosity and weight by eliminating water content, thus enhancing its ability to react and bond with other materials [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Utilization of Activated Volcanic Ash as a Substitute for Portland Cement in Mortar Formulation: A Thorough Experimental Investigation

Játiva,

Etxeberria

2024

Materials

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The manufacture of natural pozzolans as cement products is economically affordable and contributes to CO2 mitigation in the cement-based materials industry. Through two experimental stages, this study evaluates the feasibility of using volcanic ash (VA) to partially substitute portland cement (PC) in mortar production. In Stage 1, the effectiveness of different activation methods, such as calcination, alkali activation, and lime addition, in enhancing VA reactivity was assessed when the mortars were produced using 35% VA. The compressive strength (fcm) and physical properties of the mortars produced were determined at 7 and 28 days and compared with those of mortars without activated VA. In Stage 2, the most effective treatments obtained from Stage 1 were applied to produce mortars with 50% and 75% of VA replacements, focusing on their physical and mechanical properties. The findings revealed promising results, particularly when mortars were produced with up to 50% calcined VA (CVA) at 700 °C and 20 wt% lime addition, reaching a higher fcm than 45 MPa. Chemical activation with 2% CaCl or 1% NSi enhanced early-age strength in 35% VA-based mortars. Additionally, NSi-activated CVA-lime-based mortar at 50% VA achieved a notable fcm of 40 MPa at 28 days. Even mortars with 75% VA replacement achieved an adequate compressive strength of 33MPa at 28 days. This study determined that VA-based mortars have the potential for construction applications.

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Microscopic mechanism analysis of the influence of stone powder with different replacement ratio on concrete performance

Tier

2022

Arab J Geosci

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Potential use of activated Algerian natural pozzolan powder as a cement replacement material

Cited by 9 publications

References 47 publications

Volcanic Ash as a Sustainable Binder Material: An Extensive Review

Volcanic Ash as a Sustainable Binder Material: An Extensive Review

Exploring the Utilization of Activated Volcanic Ash as a Substitute for Portland Cement in Mortar Formulation: A Thorough Experimental Investigation

Microscopic mechanism analysis of the influence of stone powder with different replacement ratio on concrete performance

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