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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 40 Abstracts search results
Document:
SP82-34
Date:
September 1, 1984
Author(s):
Taketo Uomoto and Kazusuke Kobayashi
Publication:
Symposium Papers
Volume:
82
Abstract:
To control the quality of steel fiber reinforced con-determination of fiber content is one of the most important matters in practice. Although SFRC is often assumed to be satisfactorily mixed by any concrete mixer, uniform fiber content can not always be obtained if mix proportions and mixer design are unsuitable. To deal with the problem of nonuniform fiber a simple in-situ test is needed to check the quality of SFRC before it is cast. Determination of the fiber content of SFRC can be accomplished by using techniques such as X-ray image analysis, separation by washout analysis, and an electro-magnetic method. However, some of these techniques are too troublesome to be used as in-situ The special electro-magnetic method described herein is not only applicable to hardened concrete but also to fresh concrete. Measurement of fiber content can be done within a few minutes whether the test is performed in the laboratory or on the job. The proposed method of measuring fiber content is discussed from the point of view of practical problems such as the effects of distribution and orientation of fibers, etc.. This method has been introduced as a standard test of SFRC in Japan.
DOI:
10.14359/6579
SP82
Editor: V.M. Malhotra
SP82 Contains 38 papers covering the following in situ/nondestructive testing methods: surface hardness and penetration resistance tests; pullout; ultrasonic pulse velocity; break-off; combined methods; maturity techniques. For tests of concrete other than strength: magnetic; electrical; radioactive; pulse echo; radar; microwave absorption; acoustic emission; nuclear; infrared thermography; and permeability methods. A global review of in situ/nondestructive testing is also included.
10.14359/14039
SP82-39
N.G. Zoldners and J.A. Soles
Non-destructive concrete testing methods provide construction engineers and concrete technologists with useful tools for quality control of concrete and for evaluating the strength and durability of existing structures. This annotated bibliography, chronologically arranged, compiles literature published from 1975 to 1983 on innovations and modifications of non-destructive methods used for the testing of concrete. Attention was focused on the new methods used for monitoring concrete deterioration, crack development and corrosion of reinforcement. The journals, symposia and books selected for review have international stature, and contain state-of-art experimental works from diverse laboratories. Authors' abstracts or their translations are included when possible, to assist the. Concrete engineer in determining the applicability of a method to provide needed data. The study was made possible with a Canadian government contract awarded to the senior author.
10.14359/6584
SP82-27
Anker Jon Hansen, Niels Saabye Ottosen, and Claus Germann Petersen
able and First, the main test susqested appplies low air pressure to ease over time for a siven depth as a measure of the air-permeability. And hre .40, compressive strength respectively 10 MPa (1450 psi) , 26 MPa (3770 psi), and 86 MPa (12500 psi) all types of concretes having 90% The paper describes methods, theory, and port apparatus for estimating gas-permeability of concrete in situ, the users’ preliminary field experiences.the surface of the concrete, and monitors the pressure incr We present a theory of induced transient air flow in concrete substantiate the theory by laboratory measurements in qualities of concrete ( w/c-ratios 1.00, 0.55 and 0 relative humidity). We also outline field experience with The relative humidity must be monitored and, if nee corrected for. Second, other types of in-situ test applications of reveal other properties, including microcracks and porositie the outer surface layer, resistance to carbonation of concreting for a depth of down to 50 mm. The ded,gas s in the reinforcement cover, and bleeding below aggregates during
10.14359/6572
SP82-26
Yoshio Kasai, lsamu Matsui, and Motoshi Nagano
This paper deals with a rapid air permeability test for site concrete. First, the development of test method is discussed, and the effect of various variables such as capacity of manometer, length of hose, recovery height of mercury head and, depth of test hose, are examined. Secondly, the test is applied to full size specimens, and the relationships between the height of concrete and the strength of cores, carbonation depth and air permeability are discussed. Finally, the developed test method for air permeability of concrete on site is described. Briefly the test method consists of boring a hole of 5 mm in diameter and 40 mm in depth plugging it with a rubber stopper, into which a big injection needle is introduced and connecting it to a manometer. Vacuum is then applied to the system and the recovery speed of mercury head is measured which then represents the air permeability of concrete.
10.14359/6571
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