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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 39 Abstracts search results
Document:
SP121-15
Date:
November 1, 1990
Author(s):
B. J. Addis and M. G. Alexander
Publication:
Symposium Papers
Volume:
121
Abstract:
Discusses the need and requirements for a method of proportioning high-strength concrete mixes. The development of the method, which is based on a well-established method used for conventional concrete, is described. Design charts are given for various stone sizes, and an example of such a chart is illustrated. Because the method is based on easily determined aggregate properties, it is suitable for any type of aggregate: crushed or naturally occurring stone and sand, and graded or single-sized stone.
DOI:
10.14359/2507
SP121-16
D. Tachibana, M. Imai, N. Yamazaki, T. Kawai, and Y. Inada
It is more difficult to obtain good workability and to assure high concrete compressive strengths for high-strength concretes than for lower strength concretes. Several admixtures are often used in combination to increase workability of the fresh concrete. Along these lines, two kinds of chemical admixtures and three kinds of mineral admixtures were selected for use in this study. The study was carried out to examine the effects of materials, particularly admixtures, and mix proportions on several properties of freshly mixed and hardened concrete having a compressive strength of more than 100 MPa. This paper reports on the contribution of silica fume to the workability and constructibility, with a focus on improvement of its compressive strength. It is also reported that ground granulated blast furnace slag can be utilized to improve several properties, e.g., control of thermal cracks due to the heat of cement hydration. Furthermore, slump loss characteristics, the resistance to segregation, tensile strength, modulus of elasticity, shrinkage, creep, and freeze-thaw durability, and the alkali-aggregate reactivity were tested.
10.14359/2510
SP121-30
George c. Hoff
Briefly reviews five joint industry-research programs pertaining to offshore concrete structures. These programs were sponsored by the oil and gas industry and related construction industries. These studies, conducted in both North America and Norway, included the use of high-strength, lightweight aggregate concretes in both material and structural evaluations. Selected characteristics of the high-strength, lightweight aggregate concretes used in these studies (such as ductility in reinforced concrete elements, punching shear behavior, and fatigue characteristics) are summarized. Future research needs are discussed.
10.14359/3768
SP121-32
Min-Hong Zhang and Odd E. GjorvI
Pore structure, density, and strenght may vary within a wide range for different types of lightweight aggregate. Hence, not all types of lightweight aggregate are suitable for production of high-strength concrete. In the present work, the significance of various lightweight aggregates on the concrete strenght and density was studied. Twenty-eight-day compressive strengths up to 102 MPa, corresponding to a density of 1865 kg/m3, were obtained. The type of lightweight aggregate appears to be the primary factor controlling both the density and the strength. For high-strength lightweight concrete, it is difficult to predict the 28-day strengths from early strengths because of the influence of the aggregate.
10.14359/3778
SP121-37
S. Helland
In Norway, almost every car is equipped with tires that have small steel studs to improve the traction between the tire and the road for driver control during the winter season. These studded tires have an enormous wearing effect on ordinary asphalt pavement. Roads with the heaviest traffic near the major towns need to be resurfaced at intervals of 1 to 2 years. To improve the abrasion resistance, application of high-strength concrete instead of asphalt has been started. The national Norwegian cement producer has performed a large-scale investigation to determine the relation between concrete composition and abrasion resistance. The results prove that a 100 MPa concrete might approach the same properties as massive granite. The paper describes a number of projects performed by an independent company, where this high-quality material has been utilized in practical construction.
10.14359/3793
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