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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 17 Abstracts search results
Document:
SP168
Date:
April 1, 1997
Author(s):
Editors: Stephen Pessiki and Larry Olson / Sponsored by: ACI Committee 228
Publication:
Symposium Papers
Volume:
168
Abstract:
ACI Committee 228 has been active in the field experiences in the area of nondestructive testing of concrete. This volume contains 16 papers of which many were presented at the two most recent technical sessions organized by the committee. The first session was held during the ACI Spring Convention in 1993 in Vancouver, BC, Canada. The second session was held during the American Concrete Institute Fall Convention in 1995 in Montreal, Quebec, Canada. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP168
DOI:
10.14359/14208
SP168-09
Randall Poston and Mary Sansalone
This paper presents both a brief explanation of the impact response of bar-like structures and an application involving the use of the impact-echo method for detecting cracks in the beams and columns of a post-tensioned parking garage structure. The information gained from the impact-echo tests was used to aid in specifying repair measures for the structure. In the process of implementing repair measures, selected impact-echo results were verified. This field study was performed in 1991. This paper was presented at the AC1 Fall Convention in 1992.
10.14359/5956
SP168-08
N. A. Cumming and 0. S. Ooi
A major structural repair and strengthening program was undertaken at a large grain shipping terminal on Canada’s northwest coast. The work was required to correct problems of excessive cracking and internal delamination in the silo walls. During the repair work, it was necessary to survey 42 silos to locate zones of delaminated or deteriorated concrete. This was done successfully using the impact-echo procedure. This paper describes the impact-echo survey and its findings. It further discusses correlation of test results to actual conditions encountered in the field.
10.14359/5955
SP168-07
Mary Sansalone, Jiunn-Ming Lin, and William B. Streett
This paper describes the use of a P-wave-speed measurement technique in conjunction with the impact-echo method to nondestructively and accurately determine the thickness of new concrete pavements and other plate-like structures. Portable instrumentation (computer, data-acquisition hardware, transducers, and impactors) that can be used to perform both wave speed and impact-echo measurements accurately and reliably is described. Results of preliminary field studies carried out on a Strategic Highway Research Program (SHRP) Test Section in Arizona are reported, including results obtained from pavements having different thicknesses, different strengths, and placed on different types of subgrades. The goal of this work 8 to lay the basis for an ASTM Standard Test Method for determining the thickness of concrete pavements and other plate-like structures.
10.14359/5954
SP168-06
Jiunn-Ming Lin and Mary Sansalone
Dilatational or P-wave speed in concrete is needed in impact-echo testing if the dimensions of structural elements or the location of flaws is to be determined. Previously the P-wave speed had to be determined from cores or from performing a test on a portion of the structure having known dimensions and no flaws. In cases where neither approach was possible, an estimate had to be made of the wave speed. This paper presents the details of a method for independently determining P-wave speed in concrete using a Rayleigh-wave speed measurement between two points on the surface. Such a procedure increases the power, versatility, and ease of use of the impact-echo method. In this paper the Rayleigh wave speed procedure is explained. Systematic errors involved in the measurement procedure areexamined, and the accuracies that can be expected using the procedure in conjunction with the impact-echo test procedure are discussed. Appropriate uses of the procedure are given, and the limitations of the method are stated. It is shown that the Rayleigh wave technique is an easy to use technique for estimating wave speeds. Typically, speeds within about 4% of the actual wave speed can be obtained.
10.14359/5953
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