Aggregate-cement paste interface. ii: influence of aggregate physical properties

• Published in: Cement and concrete research Vol. 28; no. 10; pp. 1453 - 1465
• Main Authors: Tasong, W.A, Lynsdale, C.J, Cripps, J.C
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 01.10.1998; Elsevier Science
• Subjects: Aggregates and other concrete constituents; Applied sciences; Buildings. Public works; Cement concrete constituents; Concretes. Mortars. Grouts; Exact sciences and technology; Materials; Properties and performance of fresh concrete; Mechanism analysis; Roughness; Concrete mix design; Experimental device; Experimental study; Physical properties; Fresh concrete; Tensile strength; Hardening; Fluid solid interface; Cement paste; Surface properties; Aggregate(materials)
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/S0008-8846(98)00126-4

This paper describes part of a large project on aggregate-cement interactions and interface bonding mechanisms in concrete. This part of the study investigates the influence of aggregate physical properties on the nature of aggregate-cement paste interfacial bonding with the aim of establishing the bonding mechanisms as controlled by aggregate physical properties. A newly developed experimental technique to characterise quantitatively the aggregate surface texture using a surface profilometer is also presented. Three commonly used concrete aggregate rocks (basalt, limestone, and quartzite) were investigated. Significant differences in the measured bond strength and modes of failure of rock-hardened cement paste composite specimens under uniaxial tension were observed between the different rock types. Based on the results presented, it is apparent that for a given cement paste, the interfacial bond strength cannot be predicted from aggregate surface roughness alone.