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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 7/8
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON THE DESIGN AND CONSTRUCTION OF NON-CONVENTIONAL STRUCTURES
Edited by: B.H.V. Topping
Paper XX.3

Fracture Toughness of OPC/microsilica Concrete

B.B. Sabir, M. Asili and S.D. Summerhayes

Department of Civil Engineering, The Polytechnic of Wales, Pontypridd, Mid. Glamorgan

Full Bibliographic Reference for this paper
B.B. Sabir, M. Asili, S.D. Summerhayes, "Fracture Toughness of OPC/microsilica Concrete", in B.H.V. Topping, (Editor), "Proceedings of the International Conference on the Design and Construction of Non-Conventional Structures", Civil-Comp Press, Edinburgh, UK, pp 215-222, 1987. doi:10.4203/ccp.7.20.3
Abstract
This paper describes a simple procedure for evaluating the first cracking fracture toughness of concrete materials. The test specimen employs quality control 100 mm cube samples modified by the introduction of symmetrical notches on opposite faces. The notches are formed after casting using a masonry cutting disc. The specimen is loaded eccentrically in an Instron machine until sudden fracture takes place in the zone remote from the loading. Failure is unstable and results in a sudden splitting of the specimen into halves. The experimental load at failure is employed in a finite element analysis to obtain the fracture toughness of the material.

The tests were conducted on concrete cubes in which the cement is partially replaced by microsilica. The effect of notch size on the fracture toughness is evaluated for a range of additions of microsilica. Preliminary results from a new compression splitting test employing the same.

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