Abstract
This paper examines the effect of the aggregate type on concrete strength, and more specifically, how the petrographic characteristics of various aggregate rocks as well as their physico-mechanical properties influences the durability of C 25/30 strength class concrete. The studied aggregate rocks were derived from Veria-Naousa and Edessa ophiolitic complexes as well as granodiorite and albitite rocks from their surrounding areas in central Macedonia (Greece). Concretes were produced with constant volume proportions, workability, mixing and curing conditions using different sizes of each aggregate type. Aggregates were mixed both in dry and water saturated states in concretes. Six different types of aggregates were examined and classified in three district groups according to their physicomechanical properties, petrographic characteristics and surface texture. The classification in groups after the concrete compressive strength test verified the initial classification in the same three groups. Group I (ultramafic rocks) presented the lowest concrete strengths, depending on their high alteration degree and the low mechanical properties of ultramafic aggregates. Group II (mafic rocks and granodiorite) presented a wide range of concrete strengths, depending on different petrographic characteristics and mechanical properties. Group III (albite rocks) presented the highest concrete strengths, depending on their lowest alteration degree and their highest mechanical properties. Therefore, mineralogy and microstructure of the coarse aggregates affected the final strength of the concrete specimens.
Highlights
Concrete, a mixture of cement, aggregates and water, is the most used man-made material, [1,2,3,4].The basic component of concrete is the material that binds the aggregate particles together, commonly comprising a mixture of cement and water [1,5,6]
The aim of this study is to investigate the properties of a series of coarse crushed aggregate rocks ranging in composition from acidic through mafic to ultramafic, which can be used for the preparation of concretes
The most common statistical method used for the determination determination of the relationships between the various engineering parameters of rocks is the of the relationships between the various engineering parameters of rocks is the regression analysis regression analysis correlations are observed between physical and
Summary
A mixture of cement, aggregates and water, is the most used man-made material, [1,2,3,4]. The basic component of concrete is the material that binds the aggregate particles together, commonly comprising a mixture of cement and water [1,5,6]. Concrete structures can be described as a three-phase system composed by hardened cement paste, aggregate and the interface between aggregate particles and cement paste [7,8]. Aggregates are the major constituents of concrete, typically occupying between. It is expected that aggregates have an important influence on the concrete parameters [9]. The selection of the coarse aggregate type in concrete is a dominant
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