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Microstructural investigation of Different Types of Coarse Aggregate used in Concrete

Abstract

As an important component of concrete, aggregate has significantly influence on normal and high performance concrete. In this paper, the effect of aggregate types on the strength properties of  normal and high performance concrete with target compressive strength of 20,40,60 MPa were investigated. Concrete specimens were prepared with four different types of aggregates, namely limestone, pink granite, grey granite and anthorsite. Tests conducted include compressive strength, split tensile strength and fle xural strength. For better understanding of the crack initiat ion and propagation in concretes with different coarse aggregate, a microstructural examination using petrographic studies are also presented. The result obtained help to explain how the coarse aggregate type and strength of concrete affect the compressive strength. The test result reveals that strength of grey granite was higher than other types of aggregate studied. This work suggested that normal and high performance concrete can be made by evaluating sources of aggregate and it could be used for the preferable grade of concrete. 

Author

K.Akila, A.Abishanth, S.Bharani,S.Deepak, K.P.Vishalakshi
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