Mechanical behaviour of various mortars made by combined fly ash and limestone in Moroccan Portland cement

• Published in: Cement and concrete research Vol. 32; no. 10; pp. 1597 - 1603
• Main Authors: Elkhadiri, I, Diouri, A, Boukhari, A, Aride, J, Puertas, F
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 2002; Elsevier Science
• Subjects: Applied sciences; Buildings. Public works; Concretes. Mortars. Grouts; Exact sciences and technology; Fly ash; General (composition, classification, performance, standards, patents, etc.); Grinding; Limestone; Materials; Mechanical behaviour; Mortars; Limestone; Mortars; Fly ash; Grinding; Mechanical behaviour; Mortar; Grinding(comminution); Concrete mix design; Mechanical properties; Compressive strength; Experimental study; Portland cement; Bending strength; Morphology; Water requirement; Setting time; Physicochemical properties
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/S0008-8846(02)00834-7

Physico-chemical properties and mechanical behaviour of ternary cements made by Portland cement, fly ash and limestone are studied. The mixtures at various compositions of clinker, gypsum fly ash and limestone are intimately ground and compared to other compositions without fly ash. Blended fly ash cements are also studied. The results show that fly ash acts as grinding agent by reducing the required time to obtain the same percentage of particles retained on a 80-μm sieve as the standard cement. Fly ash cements lead to an important extension of setting time than limestone cements. The replacement of clinker by limestone gives better mechanical strengths than the mixtures containing fly ash at early days; after 28 days, the cements prepared by incorporation of fly ash gain an important strength. From mechanical point of view, an optima dosage was obtained at 77% clinker, 2% gypsum, 7.5% fly ash and 13% limestone composition.