The Point-Load Test for Tensile Strength Estimation of Plain and Fibrous Concrete

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Title: The Point-Load Test for Tensile Strength Estimation of Plain and Fibrous Concrete

Author(s): P.J. Robins

Publication: Special Publication

Volume: 82

Issue:

Appears on pages(s): 309-326

Keywords: concrete cores; concretes; fiber-reinforced concretes; nondestructive tests; tensile strength; tension tests.

Date: 9/1/1984

Abstract:
Whilst compressive testing is by far the most common method of testing cores, there exists a need for a method of tensile strength estimation. The point-load test is investigated for its potential to satisfy this need, and the results of over 800 point-load core tests carried out on a plain, fibrous and sprayed fibrous concretes are discussed. A good straight-line relationship between flexural strength and 68mm core point-load strength is obtained for both plain and fibrous concretes. The average values of the coefficient of variation of the point-load strengths for plain and fibrous concretes were both between 8 and 9%; this compares with a value of 6% for the flexural strengths. The point-load method is shown to be of particular potential for assessing the strength properties of sprayed fibrous concretes.