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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 91 Abstracts search results
Document:
SP128-54
Date:
November 1, 1991
Author(s):
H. Mugurumu
Publication:
Symposium Papers
Volume:
128
Abstract:
The authors had tested eight square reinforced concrete columns subjected to combined flexure and constant axial loads of 0.254 to 0.629 f'?c A?g, and the test results were reported in a previous paper. This study is a continuation of that previous study. The objective of this study is to evaluate the ductility enhancement of high-strength concrete columns achieved by effectively confining the core concrete using transverse reinforcement with high yield strength. Four test columns were constructed using concrete with compressive strength of 130 MPa, transverse reinforcement with yield strength of 408 or 873 MPa, and ordinary longitudinal reinforcement. Those columns tested under reversed cyclic lateral loads with constant axial compressive load levels of 0.343 or 0.473. Test results indicated that even for such high-strength concrete columns adequate ductility was secured by using high-strength transverse reinforcement. Based on the test results, the stress-strain model on confined concrete previously proposed by the authors was modified to be applicable not only to ordinary strength concrete but also to high-strength concrete
DOI:
10.14359/2871
SP128-17
Akira Ohata and Giles Goldsbro
The paper briefly introduces experience with rotating machinery grouting, and the perceived need for a high-temperature service polymer-based grout material. It discusses design and handling parameters, and the development of a product that cures at ambient temperatures, without appreciable shrinkage, and has a compressive strength at 150 C of more than 40 MPa.
10.14359/1917
SP128-18
L. R. Prudencio, Jr.
The evaluation of early-age strength of shotcrete is very important for some kinds of applications, for example, tunnel linings. However, until now there has been no suitable procedure for this purpose. This paper provides information on a test program carried out to establish an experimental procedure to evaluate the compressive strength of shotcrete at early age (to 8 MPa). Results obtained using the Meynadier needle and the constant energy penetrometer are shown. The first test was employed for very low-strength concrete (less than MPa) and the second covered a higher range (1 to 10 MPa). The influence of mixture proportions on the test results was evaluated.
10.14359/1932
SP128-70
Gordon A. Lang and Anthony G. Martin
A major rehabilitation of the reinforced concrete approach viaduct to the Pattullo Bridge has been successfully completed over the last nine years. A condition inspection revealed that extensive cracking had taken place over the years,especially at the bridge girder ends due mainly to frozen bearings. A program of bearing replacement was carried out at all girder ends along with seismic improvements and general concrete repairs. An elaborate falsework system was designed which was easily adaptable to the varying geometry along the viaduct. Load transfer to the falsework to implement the rehabilitation was achieved using a hydraulic jacking system. The work was carried out in a series of six contracts and the project was completed without any bridge traffic closures during the assignment.
10.14359/3465
SP128-74
R.L. Nene and P. S. Kavle
An intense fire in the antioxidant plant of a chemical factory near Bombay caused extensive damage to the reinforced concrete frame of the building as well as to the flooring, equipment, fixtures, and fittings. Consultants were appointed to investigate the damaged structure and later to design and supervise the rehabilitation work. After the preliminary investigation, the consultants decided that it was not necessary to demolish the structure, as long as it was possible to restore the structural members at a reasonable cost and within a short time span. In addition to visual inspection and sounding, extensive nondestructive tests were conducted to determine the extent of damage and the residual strength of the important load-carrying members of the structures. The findings of the investigations were analyzed and the restoration system was designed by the consultants. The paper outlines the considerations that led to restoration of the structure in preference to demolition, the details of investigations, the analysis of the findings, and the successful rehabilitation techniques that followed.
10.14359/3469
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