01555077

Component

Results of compressive strength of drilled cores are compared with the results of rebound hammer (ASTM C805), penetration resistance (C803), ultrasonic pulse velocity (C597), and the pull-out test (C900). All results were obtained at an age of 3 days. These tests were repeated 12 times over 15 years as an integral component of Federal Highway Administration's (FHWA’s) “Highway Materials Short Course Portland cement conrete (PCC) Module,” conducted as a hands-on demonstration of non-destructive test (NDT) methods and variability of measured strength within a single load of concrete. Participants sampled concrete from the truck, made specimens, and cured them under both laboratory and field conditions. Each team also cast one concrete slab (4ft. x 4ft. x 8in. thick) from which three cores were extracted, and upon which NDT tests were performed. Compilation of the multi-year data-set demonstrates broadly scattered test results in both core and NDT tests. In any given year all specimens were made with concrete sampled from the same single truckload. In the general case, broad correlations or trends could be identified between results of NDT tests and core strength. The precision with which one could infer in-place strength from NDT results varied considerably, with better results often obtainable within, rather than across, a given concrete mixture and set of curing conditions. The utility of generic calibrations accompanying NDT equipment varied considerably.

This paper was sponsored by TRB committee AFN20 Properties of Concrete.

01550057

15-1927

English

19p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; References; Tables

Admixtures; Compressive strength; Concrete tests; Education and training; Nondestructive tests; Penetration resistance; Rebound

U.S. Federal Highway Administration

Pullout strength

Construction; Education and Training; Highways; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2015 Paper #15-1927

PRP, TRIS, TRB, ATRI

Dec 30 2014 12:42PM