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International Concrete Abstracts Portal

Showing 1-5 of 46 Abstracts search results

Document: 

SP186

Date: 

May 1, 1999

Author(s):

Editors: V.M. Malhotra, P. Helene, L.R. Prudencio Jr, and D.C.C. Dal Molin

Publication:

Symposium Papers

Volume:

186

Abstract:

The Second CANMET/ACI International Conference was held in Brazil in 1999 and showcased information on emerging high-performance concrete in Brazil and other South American countries. Over 100 papers were submitted from all over the world and were reviewed in accordance with ACI policy. Forty-five were accepted for publication in this volume. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP186

DOI:

10.14359/14225


Document: 

SP186-16

Date: 

May 1, 1999

Author(s):

A. DiMaio, G. Giaccio, and R. Zerbino

Publication:

Symposium Papers

Volume:

186

Abstract:

Due to the advances in the scientific and technological knowledge of concrete several special concretes have been developed. High Performance Concrete (HPC) is one of the most important. It is used for a wide range of field applications as it shows high early strength, low porosity and good durability. HPC has been applied in the construction of many important structures and has been specified where only service life is required. This paper presents test results obtained from drilled cores obtained from 2 years old slabs of 2.00 by 4.00 by .20 m with the purpose of analyzing the physical mechanical properties in field conditions. A conventional concrete and three High-Performance Concretes were evaluated. Compressive and tensile strength, permeability, resistance to abrasion and absorption were measured. The effects of improper consolidation and the introduction of mineral admixtures (a natural pozzolan was incorporated) are discussed.

DOI:

10.14359/5561


Document: 

SP186-41

Date: 

May 1, 1999

Author(s):

R. H. Scott, S. J. Hamil, and P. S. Baglin

Publication:

Symposium Papers

Volume:

186

Abstract:

Results from tests on eight high strength concrete external beam-column connection specimens are presented an compared with results from a similar set of normal strength concrete specimens. The number of connection zone column ties was varied from zero up to a total of seven. The technique of internally strain gauging the reinforcement was used to measure strains in the main beam and column reinforcement. Additionally, connection zone column ties were also strain gauged in the eight specimens which had one or three such ties in the connection zone. Results are presented to illustrate the performance several are present. Twelve other specimens were tested. Nine sued normal strength concrete augmented with steel fibres whilst the other three used non-standard reinforcement details involving steel plates. Results are presented to compare the performance of these specimens with those using high strength concrete.

DOI:

10.14359/5586


Document: 

SP186-19

Date: 

May 1, 1999

Author(s):

M. Stroeven and P. Stroeven

Publication:

Symposium Papers

Volume:

186

Abstract:

A "realistic" structural computer simulation system, SPACE, has been developed to assess the characteristics of dense random packings of particles in opaque materials like concrete. The paper presents a short introduction to the system, thereby only dealing with the essential design features. Nest, some applications to particle packing problems will be demonstrated, in which use is made of the simulation system. It will be shown that it can be a useful tool to support or even to evaluate experimental studies. But most of all, it will be shown that it can offer information on structural details that can not be obtained in another way, or only at the expense of considerably more effort. These structural details provide insight into complicated assessed that interface discontinuities in a particulate composite will extend much further into the interior of the material body than suggested by density or porosity measurements near such interfaces.

DOI:

10.14359/5564


Document: 

SP186-02

Date: 

May 1, 1999

Author(s):

J. G. Cabrera and C. D. Atis

Publication:

Symposium Papers

Volume:

186

Abstract:

This paper discusses a new method for the determination of the optimum W/C plus FA for maximum compaction of no slump concrete made with high volumes of fly ash. It explores the effect of fly ash fineness and particularly, carbon content on the explores the effect of fly ash fineness an particularly, carbon content on the compressive strength of the mixtures made with 50% and 70% replacement of normal portland cement with fly ash. By using an appropriate surfactant the no slump concrete mixtures are rendered workable and suitable for structural applications. The strength attained at 28 days is 60 Mpa or more, and therefore these mixtures are considered to yield high-strength concrete. The performance of the high-volume fly ash concrete is assessed in terms of abrasion and fatigue resistance that are the most appropriate performance indicators for concrete that will be used for the construction of pavements.

DOI:

10.14359/5547


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