ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
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 33 Abstracts search results
Document:
SP154-15
Date:
May 1, 1995
Author(s):
Y. Tsukinaga, M. Shoya, R. Sugawara, and H. Nonome
Publication:
Symposium Papers
Volume:
154
Abstract:
In this study, the use of a new permeable sheet was evaluated in making the surface layer of concrete denser, thus improving the performance and durability of the concrete. The application of permeable sheet was confirmed effective in the lowering of water-cement ratio corresponding to the decrease of pore volume; this resulted in the increase of pull-off of tensile strength, rebound number, pulse velocity, and pin penetration resistance in the surface layer. It was also observed that the air bubbles were likely to move from the internal portion to the surface with the expelled flow of water, remarkably reducing bugholes on the concrete surface. The use of new type of permeable sheet improved resistance to freezing and thawing cycling and reduced the depth of carbonation and the ingress of chloride ions. Furthermore, the water tightness was also improved.
DOI:
10.14359/959
SP154
Editor: V.M. Malhotra
SP-154 In 1995, The Canadian Centre for Mineral and Energy Technology (CANMET), in association with the American Concrete Institute and other organizations sponsored a second conference on Advances in Concrete Technology. The objectives of this conference was to bring together representatives from industry, universities, and government agencies to present the latest information and explore new areas of needed research and development. Thirty two papers from 20 countries were reviewed and accepted for inclusion in this new publication based on the symposium subject, advances in concrete technology. The range of subjects is varied due to the wide range of experts involved in this project.
10.14359/14194
SP154-04
A. Ogawa, K. Sakata, and S. Tanaka
In recent years, highly flowable concrete which can be placed without any consolidation has been widely studied. A basic study on this type of concrete incorporating limestone powder and a method for reducing shrinkage properties of the concrete are presented in this paper. In the mixture proportioning for the concrete, a high-range water-reducing admixture is used to increase the flowability of concrete. A small amount of viscosity-increasing agent is also added to minimize the segregation. Limestone powder, which is a low reactivity material, is used to reduce the heat of cement hydration and shrinkage of concrete. Although drying shrinkage of the highly flowable concrete incorporating limestone powder was smaller than that of ordinary concrete or other highly flowable concretes, shrinkage of the concrete needs to be further reduced so that it will be a crack-free concrete. To accomplish this, a method for reducing drying shrinkage of concrete by applying a shrinkage-reducing agent and an expansive additive was tested and good results obtained.
10.14359/950
SP154-05
N. Han and J. C. Walraven
Presents the results of an ongoing experimental research program on creep and shrinkage behavior of high-strength concrete loaded at an early age (16 hours) and a normal age (28 days). The experiments were carried out on high-strength concrete with three types of aggregates (crushed gravel, granite, and limestone). The concretes were dried and loaded at ages of 16 hours and 28 days after casting. Loading levels with stress/strength ratios ranging from 0.15 to 0.70 were adopted in the experiments. The creep deformations were measured for a duration ranging from 90 to 210 days. The experimental results are compared in this paper with the predictions of CEB-FIP Model Code 1990, the modified MC90 model, and the model proposed by ACI Committee 209. The aging effect (in particular, at early ages) is emphasized and the influences of various factors on the aging effect are discussed.
10.14359/951
SP154-06
P. Sandberg
The resistance of rice hull ash (RHA) concrete to freezing and thawing in saline environment was studied in the laboratory, for non-air- entrained high performance and normal concrete. The Swedish standard test for concrete resistance to freezing and thawing in saline environment was used. Although the number of tests was limited, the results were very promising for the use of RHA in non-air-entrained normal or high performance concrete. The laboratory salt scaling for concrete with 15 to 30 percent replacement of portland cement with RHA indicated that RHA concrete without air entrainment would be fairly resistant to freezing and thawing in most applications except for in very severe climates. No indications on an accelerated scaling rate over time was observed for RHA concrete, as opposed to the accelerated scaling rate found for a non-air-entrained high performance silica fume concrete tested.
10.14359/952
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer