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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 15 Abstracts search results

Document: 

SP69

Date: 

August 1, 1981

Author(s):

Editors: David W. Fowler and Lawrence E. Kukacka

Publication:

Symposium Papers

Volume:

69

Abstract:

SP-69 A selection of topics covering basic development and applications of polymers in concrete. Contains 14 papers from a 1980 symposium on this subject. Research projects, special construction uses, industrial applications, performance studies, and types of polymer admixtures are reported.

DOI:

10.14359/14121

Document: 

SP69-12

Date: 

August 1, 1981

Author(s):

Y. Ohama and K. Demura

Publication:

Symposium Papers

Volume:

69

Abstract:

The objective of this study was to find an appropriate method of evaluating mold-releasability ofmold-releasingagents for polyester resin concrete. A tension or shearing test involving resin concrete cast in thin frames on steel plates coated with mold-releasing agents was selected as an appropriate method. BY apply- ing this method, 17 commercially available mold-releasing agents were tested and evaluated for mold-releasability. The effect of vibrating compaction on the mold-releasability was also examined. It is concluded from the results that the mold-releasability of silicone and fluorine-containing agents is excellent, and that generally it is considerably affected by vibrating compaction.

DOI:

10.14359/6387

Document: 

SP69-13

Date: 

August 1, 1981

Author(s):

B. W. Staynes

Publication:

Symposium Papers

Volume:

69

Abstract:

Epoxide resin concrete produced by vacuum impregnation of a prepacked aggregate has handling properties and stiffness (40 GN/m 5 reatly improved at 70 C) when compared with conventionally mixed and placed epoxide resin concrete. This material has been developed for superconducting turbogenerators, but with its improved qualities coupled with high strength (150 MN/m ), resistance to aggressive environments, impervious nature, low shrinkage and electrical resistance a wide range of applications is forecast.

DOI:

10.14359/6388

Document: 

SP69-14

Date: 

August 1, 1981

Author(s):

Jitendra K. Bhargava

Publication:

Symposium Papers

Volume:

69

Abstract:

Problems such as raised edges, "blow-ups" or even cracking have been observed in concrete overlays cast on precast concrete elements. These failures are due to the shrinkage, creep and thermal effects in the new concrete. To improve the perfor-mance of concrete in such slabs the tensile and shear strain ca-pacity of concrete has to be improved. This report gives the results of different tests made to study the effect of polymer modification on the properties of concrete. Both the strength and deformation characteristics of concrete under different kinds of loading were significantly improved by polymers. With its higher tensile and shear strength, and lower shrinkage, polymer-modified concrete should be a viable and attractive alter-native for concrete overlays and similar constructions.

DOI:

10.14359/6389

Document: 

SP69-01

Date: 

August 1, 1981

Author(s):

John A. Manson

Publication:

Symposium Papers

Volume:

69

Abstract:

As we have become more and more concerned with the con-servation of energy and materials, interest has grown in improv-ing the strength, toughness, ductility, and durability of port-land cement concrete or in finding replacements that exhibit a superior cost-property balance. Thus one approach has been to im-prove the properties of concrete itself; another-the subject of this paper-is to combine the two technologies of concrete and high polymers, using not only familiar kinds of concrete but also less familiar ones. It should be noted that combinations of siliceous materials with polymers require in many cases lower energy inputs per unit of performance than either component alone. The purpose of this paper is to provide an overview of current re-search and unsolved problems with the various classes of polymer-concrete materials. While a comprehensive review of the litera-ture is not within the scope of the paper, the general state-of-the- art is described, principal areas of research are illustrated with typical examples, and areas needing further research are suggested. Indeed, significant progress has been made recently in both fun-damental and applied research on all kinds of polymer/concrete systems. It is suggested that further progress to achieve sophisticated understanding, design, and materials selection will still require much work in combining the science, technology, and economics involved.

DOI:

10.14359/6376

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