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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 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
SP186-38
R. L. Silveira, J. M. Calixto, and J. T. Fontoura
The results of an experimental investigation on the mechanical properties and durability of high performance concrete are presented. The concrete was produced with two types of cement, two different aggregates (shingle and granite) and addition of silica fume. The compressive and splitting tensile strength as well as the secant modulus of elasticity were evaluated on concrete having compressive strength up to 90 MPa and ages from 16 hours to 91 days. The complete stress-strain curve in compression was obtained at 28 days in a strain controlled mode. The durability tests include abrasion resistance, water permeability and carbonation depth. The results indicate that the mechanical properties investigated have different developments with respect to time. They also show expressively the effect of the different coarse additionally demonstrates significant reduction in water permeability, porosity abrasion resistance. High-performance concrete also proved to be more resistant to carbonation even under poor curing conditions, and higher CO2 concentrations.
10.14359/5583
SP186-39
S. Rols, M. Mbessa, J. Ambroise, and J. Pera
Very-high strength concrete (>100 MPa) has been developed using different types of ultra-fine particles: silica fume, ground granulated blast furnace slag, metakaolin, and cristobalite. The effect of the type of ultra-fine particle on some engineering properties of concrete has been investigated: compressive strength, loss of workability and plastic shrinkage. The highest level of strength (120 MPa) was obtained using either 20% slag, or 10% metakaolin, in addition to cement. The workability was maintained for one hour when slag or cristobalite were presenting the mixture. The tests undertaken on plastic shrinkage pointed out that very-high strength concrete developed high plastic shrinkage, specially when pozzolans were used. The use of slag does not affect the plastic shrinkage.
10.14359/5584
SP186-40
J. Sebe and J. M. Calixto
The results of an experimental investigation on the water permeability of high performance concrete are presented. Several aspects were studied including different components for the concrete as well as the load history for the test specimens. The concrete was made with Brazilian Type CP V ARI cement (ASTM Type III), type different aggregates (limestone and gneiss) and silica fume. The concrete compressive strength was above 50 MPa at 28 days. For the water permeability test, the apparatus developed by Ludirdja et al. at the University of Illinois was employed. Permeability test were subjected to different load histories. In series 1, the applied load was equal to 40% of the ultimate compressive strength, while in series 2 this value was increased to 70%. The secant modulus of elasticity and the splitting tensile strength of the concretes at the start of the permeability test were also evaluated. The test results indicate clearly the effects of the load history on the value of the water permeability coefficient. As the load increases, the value of this coefficient also increases. The results also show that for high-performance concrete produced with Brazilian Type CP V ARI cement, the prescribed compressive strength may be reached in a short period of time, but the long-term water permeability coefficient seems to require a longer time to develop.
10.14359/5585
SP186-41
R. H. Scott, S. J. Hamil, and P. S. Baglin
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.
10.14359/5586
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