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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:
SP128-35
Date:
November 1, 1991
Author(s):
S. Pavlenko and I. Rekhtin
Publication:
Symposium Papers
Volume:
128
Abstract:
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.
DOI:
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
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
SP128-30
Sandor Popovics and John S. Popovics
According to the trade literature, the determinations of location, direction, and the cover thickness over a single steel bar in concrete are relatively easy and reliable from a magnetic measurement if the bar diameter is known. The estimation of the bar diameter is also possible if the cover thickness is known, although these results are less reliable. Only recent publications suggest double measurements from which both the cover thickness and the bar diameter can be estimated without previous knowledge of either of them. Unfortunately, the accuracy of diameter determination remains unimproved even with these methods. This paper attempts to present the further improvement of the magnetic determination of bar characteristics. The basic idea is to combine a magnetic device with a computer that calculates, without any previous knowledge about the bar: 1) the thickness of the concrete cover above the bar and, 2) the diameter of the bar. Preliminary data also indicate that distinction can be made whether the tested area is above a single bar or multiple bars, although this is not discussed in this paper. Experimental data obtained on laboratory specimens illustrate the new method.
10.14359/3749
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