Evaluation of natural pozzolan for use as supplementary cementitious material

This paper presents preliminary study results on the use of local natural pozzolan (NP) as a mineral addition. The natural pozzolan was obtained from a source in north-western Algeria and was composed of zeolite and plagioclase, which are mineralogical materials containing large quantities of SiO 2...

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Bibliographic Details
Published in:European journal of environmental and civil engineering 2012-01, Vol.16 (1), p.77-96
Main Authors: Senhadji, Yassine, Escadeillas, Gilles, Khelafi, Hamid, Mouli, Mohamed, Benosman, Ahmed Soufiane
Format: Article
Language:English
Subjects:
Aggregates and other concrete constituents
Applied sciences
Buildings. Public works
Cement concrete constituents
chaleur d'hydratation
chloride ion
Civil Engineering
Concrete additives (fillers, pozzolanic and hydraulic materials)
Concretes. Mortars. Grouts
durability
durabilité
Engineering Sciences
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
heat of hydration
indice d'activité
ion chlore
Materials
pouzzolanes
pozzolans
setting time
strength activity index
temps de prise
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Summary:This paper presents preliminary study results on the use of local natural pozzolan (NP) as a mineral addition. The natural pozzolan was obtained from a source in north-western Algeria and was composed of zeolite and plagioclase, which are mineralogical materials containing large quantities of SiO 2 and Al 2 O 3 . A number of cements were prepared in which portland cement (OPC) was replaced by NP in the range of 0-25%. The parameters investigated included pozzolanic activity, setting times, heat of hydration, compressive strength, and the crystalline hydration products (by XRD).The pozzolanic activity index was evaluated on the basis of physical and mechanical parameters (standards ASTM C618 and ASTM C311) and through a chemical analysis (European standard NF EN 196-5). The performance of natural pozzolan cement exposed to aggressive solutions (sulphuric and nitric acids) and their resistance to chloride permeability were also analysed. Cet article présente des résultats d'études préliminaires sur l'utilisation d'une pouzzolane naturelle locale (NP) comme addition minérale. Cette Pouzzolane naturelle provient de la region nord-Ouest d'Algérie. Elle est composée de zeolite et plagioclase qui sont des matériaux minéralogiques contenant de grandes quantités de SiO 2 et Al 2 O 3 . Des mortiers ont été préparés dans lesquels le ciment Portland (OPC) est remplacé par la pouzzolane naturelle dans des proportions variants de 0 - 25%. Les paramètres recherchés sont l'activité pouzzolanique, le temps de prise, la chaleur d'hydratation, les proprieties mécaniques. L'indice de l'activité pouzzolanique a été évalué sur la base des paramètres physiques et mécaniques (normes ASTM C618 et ASTM C311) et par une analyse chimique (norme européenne NF EN 196-5). La performance de ces mortiers exposés à des solutions agressives (acides sulfuriques et nitriques) et leur résistance à la perméabilité des chlorures furent aussi analysées.
ISSN:1964-8189
2116-7214
DOI:10.1080/19648189.2012.667692