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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 33 Abstracts search results
Document:
SP229-29
Date:
September 1, 2005
Author(s):
P.S. Bardella and G. Camarini
Publication:
Symposium Papers
Volume:
229
Abstract:
The aim of this experimental work was to evaluate the physical and mechanical performance of concretes steam cured at a maximum temperature of 60 °C. It explores the potential benefits of steam-cured concrete products in the precast industry that are made with different cements and with supplementary cementitious materials. All concretes had the same workability and were produced with two cements: high- early strength portland cement and blast-furnace slag portland cement. Concretes also had the addition of 10% of silica fume by mass of cement. The concretes were tested at different ages (mechanical strength, air permeability, capillary absorption and voids). The results showed that steam curing is beneficial to concretes made with blended slag cement, and silica fume addition improved the properties of steam-cured concretes.
DOI:
10.14359/14753
SP229-30
L. Bertolini, M. Carsana, D. Cassago, M. Collepardi, and A.Q. Curzio
The paper describes the results of research on the properties of concrete with the replacement of part of portland cement with bottom ash from municipal solid waste incinerators (MSWI). Results showed that MSWI bottom ash is potentially attractive as mineral addition for the production of concrete, provided that the risk of entrapment of hydrogen bubbles produced by corrosion of aluminium metallic particles in the fresh concrete is prevented. This could be achieved by wet grinding the bottom ash so that reactions leading to gas development could start within the slurry. A great variability was observed in the time required to exhaust the hydrogen gas production; a key factor for this variability was found in the pH of the slurry. A modest amount of cement added in slurry could increase the pH, reduce the time required to exhaust hydrogen evolution and allow manufacturing of quality concrete suitable for aggressive chloride bearing environments.
10.14359/14754
SP229-28
M.A.M. Coelho, M.G. da Silva, F.L. dos Santos Souza, R. Sarmento, R.P. de Moraes Frasson, S.M. de Moraes Pinheiro, E. Zandonade and T. Morimoto
This paper reports the results of an investigation on concrete containing alkali-activated slag (AAS). The activators used were liquid sodium silicate (3%, 4% or 5% Na2O, mass of binder) + lime (5%, mass of binder); clinker (10%, mass of binder) + lime (10%, mass of binder); lime (2%, mass of binder) + gypsum (6%, mass of binder) and clinker (16%, mass of binder). The activator of liquid sodium silicate (4% Na2O, mass of binder) + lime (5%, mass of binder) showed better compressive strength when compared to normal portland cement concrete. Other properties were studied such as elastic modulus, flexural strength, absorption of water by capillary forces, drying shrinkage and sulfate attack and the results are discussed in this paper.
10.14359/14752
SP229-24
D.L. Araujo and M.K. El Debs
The connection between precast beam and deck is formed by steel bar associated with a shear key. The steel bar is bent in hoop form and is inserted in the pocket in deck, which is filled by cast-in-place concrete. The strength of cast-in-place concrete varied from 65 MPa to 90 MPa, and a maximum volume of 1.50 % short steel fibers was added. The tests were carried out in push-out specimens submitted to three stages of no reversed cyclic load. Connections submitted to 40% of their ultimate strength show lower shear stiffness degradation when steel fibers were added. After twenty cycles of loading and unloading, the connection with fibers still maintained 85% of its initial stiffness, whereas the connection without fibers retained only 75% of its initial stiffness. The volume of fibers did not influence the stiffness degradation due to void in the cast-in-place concrete introduced by fibers. The diameter of the connector had little influence on the stiffness degradation, independent of the presence of the fibers. The addition of 1.5% of fibers to the concrete cast in the pockets also increased the ultimate shear strength of the connection up to 42% when connector of 12.5 mm diameter was used.
10.14359/14748
SP229
Editor: V.M. Malhotra
SP229 This special publication contains the papers presented at the Fourth International ACI/CANMET Conference held in Olinda, Pernambuco, Brazil, on September 6-7, 2005. It contains 32 papers on recent advances in concrete materials and testing on topics of chemical admixtures; deformations, creep, and cracking control; durability; fiber concrete; fire resistance; nondestructive tests; quality control; strengthening of structures; structural behavior; supplementary cementing materials; and sustainability. Specific papers include: Self Consolidating Concrete, High-Performance and Normal Concrete Affected by Creep at Different Age, Curing, Load Level, Strength, and Water-Cement Ratio with some Interrelated Properties; Properties of Concrete with Recycled Concrete Coarse Aggregates; Application of Different Curing Procedures in High-Performance Concrete; and many more.
10.14359/15165
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