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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 112 Abstracts search results
Document:
SP100-54
Date:
April 1, 1987
Author(s):
R. P. Northwood, B. Chojnacki, and R. A.Newell
Publication:
Symposium Papers
Volume:
100
Abstract:
Describes a laboratory investigation of concrete to determine the effect of the various brands of Type 10 portland cement with and without interground limestone on the strength and freeze-thaw durability. Two classes of concrete and two combinations of aggregates were used in the investigations. A variation in the strength of concrete made with the various cements was found. The limestone addition increases the concrete strength. Concretes made with each of the cements had very good resistance to freezing and thawing in water. However, there was a considerable variation in the resistance to salt scaling.
DOI:
10.14359/2021
SP100-55
George C. Hoff
Durability of concrete in a marine environment is a function of its mixture constituents, freeze-thaw susceptibility, abrasion resistance, fatigue strength, and corrosion of embedded metal. These problems usually manifest themselves in the tidal and splash zones of a structure. Fiber reinforced concrete has been shown to have improved fatigue characteristics and improved cracking behavior over conventional concrete. These properties can be advantageously applied to concrete in a marine environment, providing the durability in that environment is satisfactory. Paper describes a large number of both laboratory and field tests of fiber reinforced concrete, subjected to a severe exposure environment, that have been conducted over the last 20 years. Field tests in both severe and mild marine environments are included. Performance data and mixture information from these studies is provided
10.14359/2034
SP100-58
M. Sugiyama, K. Tanaka, M. Sakuta, and T. Urano
The authors have carried out a series of studies on admixtures for reducing drying shrinkage of concrete. Regarding these admixtures, extremely interesting properties were found in a glycol ether derivative that is a water-insoluble, non-air-entraining surface active agent. The following points were revealed: 1) The water-insoluble glycol ether holds down air content of the concrete to less than about 1 percent. 2) Drying shrinkage of concrete is remarkably reduced when this glycol ether derivative is added to concrete. 3) Durability against freezing and thawing of concrete containing this glycol ether derivative is improved extremely by allowing the concrete to dry slightly prior to starting the freezing and thawing test. 4) Although the total volume of air is small, the number of air bubbles present is large because the diameters of the air bubbles are very small.
10.14359/2058
SP100-110
Carl D. Harmann and Edward Mangotich
A laboratory study was conducted to evaluate the effect of replacement of up to 35 percent by weight of the design cement content in a concrete mix with Class C fly ash on sulfate durability characteristics. Seven trial batches, including a control, one Class F, and five Class C ash mixes, and three types of test specimens were used. The test sulfate environment consisted of immersion in a 10 percent pH regulated sodium sulfate solution for more than two years. Weekly measurements of weight change and expansion were used to evaluate sulfate durability. Analyses of the expansion data suggest a calculated chemical compositional relationship called the oxide durability factor may be useful in predicting sulfate durability.
10.14359/2339
SP100-111
W. G. Piasta
This investigation was carried out in order to explain the effect of the kind of aggregate on sulfate resistance of concretes and mortars. The objects of the studies were concretes with the following crushed coarse (2 to 20 mm) aggregates: porous limestone (porosity 36 percent), dense limestone (porosity 5.5 percent), and granite and mortars with the same calciferous aggregates (0 to 2 mm) and quartz sand (0 to 2 mm). It has been stated on the basis of the results of investigation that the sulfate resistance of concretes was different according to the aggregate used. However, the durability of concrete with the porous calciferous aggregate has been much better than expected in spite of its very high porosity of 36 percent. It has also been discovered that the mortars with the porous aggregate have been of higher resistance than the concretes made of that aggregate. Generally, a higher resistance of cement with fly ash replacement has been found than that of ordinary portland cement.
10.14359/2349
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