ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
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:
SP128-06
Date:
November 1, 1991
Author(s):
C. T. Tam
Publication:
Symposium Papers
Volume:
128
Abstract:
The use of nondestructive testing in the laboratory is well-documented and standard specifications are available. However, when these nondestructive testing methods are used on site, additional factors have to be taken into consideration to enable meaningful interpretation of measurements obtained. This aspect of knowledge has not received sufficient attention for standard specifications to be drafted. Suggestions are put forward in this paper on precautions to be taken when applying nondestructive testing on site. The methods of testing discussed include the magnetic method of concrete cover or bar size determination, the rebound hardness, ultrasonic pulse velocity and the penetration resistance (Windsor Probe) test. The methods of calibration in the laboratory are reviewed and the ways to check on equipment and its calibration during site work are proposed. The information to be recorded and the interpretation of data are discussed. The need for trained personnel to carry out site testing, as well as experienced professionals to interpret test results, is emphasized.
DOI:
10.14359/3666
SP128-42
D. W. S. Ho and H. T. Cao
The influence of mix constituents on the quality of concrete is discussed. Results demonstrate that the assessment of concrete performance based on the traditional parameters such as water-cement ratio and 28-day strength may be misleading. One way to insure a durable structure is to specify concrete by performance criteria. This would overcome not only the influence of constituents, but would also place emphasis on proper curing. For the protection of reinforcement against corrosion, performance criteria based on carbonation and water sorptivity are suggested.
10.14359/2053
SP128
Editor: V.M. Malhotra
SP128 Leading world experts met in Hong Kong to participate in The ACI conference on Evaluation and Rehabilitation of Concrete Structures and Innovations and Design. The specific purpose of the Conference was to disseminate technical information on emerging concrete technology in the Pacific rim region. You can review the results of that timely event in a two volume document comprised of 90 technical papers. Volume I contains paper dealing with materials. Topics include: high elastic surface coatings, concrete deterioration on high chloride and sulfate environment, nondestructive testing, impact-echo technique, fiber reinforcement, injectable cementitious materials, and case studies. Volume II is comprised of papers pertaining to design aspects. Topics include: concrete for offshore structures, performance of structural repairs, design of high-strength and reinforced concrete structures, design of beams and columns, and case studies.order.
10.14359/14160
SP128-33
Arlindo Goncalves
During a comprehensive research program on in situ determination of concrete strength, the influence of core dimensions on mean compressive strength results and their dispersion was studied. Tests were conducted on 14, 11, 9, and 5 cm diameter cores, usually with a length/diameter ratio l/d = 1; cores with l/d less than 1 were also tested. Cores were drilled from 20 cm cast concrete cubes, stored in a moist room. When using 5 cm diameter cores, the curing conditions of the cubes were varied. The 28-day strength results showed that dispersion increases with increases in concrete strength, maximum aggregate size, and reduction of core diameter. A good correlation was found between the mean compressive strengths of cubes and cores, both for the results of cores with l/d = 1 and l/d = 0.6. The mean compressive strengths of cores were the same as those for cubes and were not influenced by the core diameter. Thus, the use of small diameter cores may be possible. In this case, however, the concrete from the surface must be removed when preparing the cores, if the concrete was not moist-cured.
10.14359/1988
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
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer