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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:
SP128-04
Date:
November 1, 1991
Author(s):
N. A. Cumming, P. T. Seabrook, and V. Malhotra
Publication:
Symposium Papers
Volume:
128
Abstract:
A research program was undertaken to evaluate commercially available nondestructive testing techniques to locate voids in grouted tendon ducts. A laboratory scale mockup was used to evaluate several methods. On the basis of these results, impact-echo, ultrasonic, pulse-echo, and ultrasonic pitch-catch systems were selected for further evaluation. A full-scale mockup of a section representing an icewall of an offshore drilling structure was fabricated. It contained grouted tendon ducts with voids of various sizes and configuration. A test was carried out in which three teams of researchers from Canada and the U.S. evaluated nondestructively the mockup without knowledge of the locations or nature of the voids. This paper presents the results of the preceding evaluation and makes recommendations for further research.
DOI:
10.14359/3648
SP128-34
Paul Zia, S. H. Ahmad, and M. L. Leming
Presents a discussion of the objectives, scope, and progress of a 4-year research project on the mechanical properties of high-performance concretes with particular reference to highway applications. High-performance concrete is defined by certain requirements of strength and durability.
10.14359/2001
SP128-35
S. Pavlenko and I. Rekhtin
Describes fine-grained concrete incorporating slag sand and ash from the thermal power plants with higher frost resistance and waterproofness, excluding the use of natural aggregates, which has been designed by an independent institute.
10.14359/2015
SP128-36
J. Mirza
Hundreds of types of materials such as cementitious grouts, polymer-modified mortars and concrete, epoxy mortars and concrete, etc., are presently available to repair deteriorated concrete surfaces and a vast number of new ones are flowing into the market. Very often, important data such as physical and mechanical test data like bond strength, abrasion-erosion resistance, coefficient of thermal expansion, thermal compatibility with base concrete, permeability, modulus of elasticity, drying-shrinkage, etc., provided by the manufacturer, is scarce and users are sometimes surprised by a material's performance, especially when it is employed in severe climatic conditions. Thirty-five mortars, including a standard cement mortar used as reference, an in-house-formulated silica fume mortar, cementitious grouts, polymer-modified cement-based mortars, and epoxy mortars were studied. This paper presents some of their essential characteristics.
10.14359/2029
SP128-39
T. Sugawara, M. Shoya, and N. Saeki
This paper presents the characteristics of the surface-layer strength of concrete produced using a special curing sheet to improve the surface layer. The curing sheet is attached to the interior of the forms and has the ability to absorb water from the concrete surface and to retain the absorbed water for curing. The surface layer strength was measured by a pullout test that was carried out by modifying the Michaelis test machine and using truncated conical steel cones embedded in the concrete. The 14-day surface layer strength obtained by using the special curing sheet increased by 1.2 to 1.5 times of that obtained without using the sheet. The improved strength is attributed to the lowering of the water cement ratio in the surface layers produced by using the sheet. After freeze-thaw tests, the surface layer strength of air-entrained concrete showed less decrease independent of the use of special curing sheet. The surface layer strength might be a useful index for the evaluation of the quality of the surface layer of concrete.
10.14359/2041
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