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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 23 Abstracts search results
Document:
SP131-01
Date:
March 1, 1992
Author(s):
V. Ukraincik and D. Bjegovic
Publication:
Symposium Papers
Volume:
131
Abstract:
The greatest threat to the durability of reinforced concrete structures is the reinforcement corrosion. The paper presents the importance of the concrete protective cover and the conditions causing the reinforcement corrosion under the action of chlorides and carbonic acid. Processes of absorption, diffusion and flow, i.e. of transport of media through concrete depend on the pore system and the amount of water in the pores.Physical laws describing the penetration of aggressive agents into concre-te can serve as a basis for engineering calculations of reinforcement durability in the concrete as well as for the designing of the concrete cover. Physical laws and corresponding material parametars are briefly reviewed in the paper. For engineering purposes, in calculating the durability, four typical tasks can be solved. The processes of degradation depend on the pore system in the concrete structure, and the paper indicates some possible technological measures of structure modifications.
DOI:
10.14359/10025
SP131-02
J. J. Basson and B. J. Addiss
Mechanisms of corrosion of concrete have been extensively studied and elucidated by various workers, but rate-determining factors have been neglected, as have the interactions between different corrodents. However, by considering all relevant influences as part of the total corrosive environment, it is possible to quantify aggressiveness as indexes and use them to select the appropriate technology for the circumstances under consideration.
10.14359/1191
SP131-04
M. J. Simon, R. B. Jenkins, and K. C. Hover
Experiments were conducted to determine the influence of immersion vibration on the air-void system parameters of air-entrained concrete, as a function of both radial distance and depth from the point of vibrator insertion. For a 1½ in. (40 mm) diameter immersion vibrator, one could conclude that vibration has little or no effect on air-void systems at distances of 5, 8, or 10 in. (125, 200, or 250 mm) from the point of insertion. The same vibrator in the same concrete can reduce the total air content by 50 percent, and increase specific surface by as much as 100 percent directly at the point of vibrator insertion. Which particular effect one may observe in hardened concrete, therefore, depends on the selection of core location relative to point of vibrator insertion. These observations have implications for specifying, casting, and testing air-entrained concrete.
10.14359/1203
SP131-05
F. R. Montgomery, P. A. M. Basheer and A. E. Long
Good curing is now recognized as essential to achieving good durability of concrete and other cementitious material surfaces. However, it has not been easy to judge whether or not it has been achieved on site, so surface failures continue to occur. The Department of Civil Engineering at the Queen's University of Belfast is developing a number of test techniques to allow the measurement of surface strength, surface absorption and permeability, and surface abrasion-resistance of structures on site. These have been used to assess the performance of various curing regimes for concrete and mortar, first to see if the test methods can extract meaningful measurements of durability-related properties, and secondly to get an indication of the magnitude of the changes in these properties for different curing regimes and water-cement ratios. It is hoped that they may eventually provide a means to assess a surface in terms that could allow an objective judgment of its durability.
10.14359/1204
SP131-06
D. M. Roy, D. Shi, B. Scheetz, and P. W. Brown
The principal mechanism for the deterioration of concrete is transport of fluids either into or out of the pore structure of hardened body. The fluid transport occurs via a complex network of interconnected porosity incorporating both the cementitious matrix and matrix/aggregate interfacial regions. Paper describes the development of an experimental method and a mathematical background for a rapid water-permeability measurement method and a mathematical model relating porosity, described in terms of a log-normal distribution, to permeability.
10.14359/1205
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