Browsing by Author "Laoufi, L."

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    Durability Of Natural Pozzolan-based Mortar Exposed To Sulfate Attack
    (University of Eloued جامعة الوادي, 2016-05-01) Laoufi, L.; Senhadji, Y.; Benazzouk, A.; Langlet, T.; Mouli, M.; Laoufi, I.
    Cement is a strategic commodity in the civil engineering for the construction of reinforced concrete structures. But its production generates around 5% of toxic gases such as CO2 responsible for environmental degradation. Furthermore, cement industry is a consumer sector of non-renewable energy. The use in the cement of natural additions is a solution to reduce the CO2 gas and the cost of production. The purpose of this work is the study of a sustainable building material: natural pozzolan Beni-saf (PNB) incorporated to mortars exposed to sulfate attack (5% Na2SO4). The loss of mass, monitoring the pH reading of each attack solution as well as specimens dimensions are different tests to study the durability of mortars made with 10, 20 and 30% of natural pozzolan. The result derived from this research is that pozzolan improves mortars resistance to sodium sulfate environment.
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    Mortar Incorporating Supplementary Cementitious Materials: Strength, Isothermal Calorimetry And Acids Attack
    (University of Eloued جامعة الوادي, 2016-05-01) Senhadji, Y.; Benosman, A.s.; Escadeillas, G.; Mouli, M.; Laoufi, L.; Khelafi, H.
    Supplementary cementitious materials (SCMs) prove to be effective to meet most of the requirements of durable concrete and leads to a significant reduction in CO2 emissions. This research studies the effect different SCMs (natural pozzolan (PN) / limestone fine (FC) at various replacement levels) on the physical and mechano-chemical resistance of blended mortar. The paper primarily deals with the characteristics of these materials, including heat of hydration, strength and effects of aggressive chemical environments (using sulphuric acid and nitric acid). Over 6 mixes were made and compared to the control mix. Tests were conducted at different ages up to 360 days. The experimental results in general showed that Algerian mineral admixtures (PN/FC) were less vulnerable to nitric and sulphuric acid attack and improved the properties of mortars, but at different rates depending on the quantity of binder.