Simulated Field Trials of Non-Destructive Concrete Test Methods for Highway Structuresby John A. Bickley, John A. Bickley Associates, Toronto, Canada,
Paul Read, John A. Bickley Associates, Toronto, Canada,
Abstract: The data presented results from a two year Strategic Highway Research Program investigation into suitable NDT methods for determining the early age, and residual strengths of highway structures. In the first year many test procedures were evaluated, and a small number identified as the most promising for use in highway structures. In the second year of the programme a monolith consisting of a wall and a slab were cast at an exposure site adjacent to a concrete testing laboratory. Typical highway mixes were used. Standard and NDT procedures were carried out on the fresh and hardened concrete, and on the simulated highway structure. The maturity of the concrete in the monolith was monitored closely, and the NDT procedures included two types of pullout tests, two maturity test systems, a penetration test and a torque test. The results were compared on an absolute and on an equivalent maturity basis with standard cylinder and core tests. Differences between standard cylinder and core strengths were shown to be a function of relative maturity. The trials facilitated the choice of the most effective NDT procedures for future use of sites.
Subject Headings: Highway and road structures | Penetration tests | Nondestructive tests | Material tests | Concrete structures | Structural strength | Concrete blocks | Laboratory tests
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