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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 35 Abstracts search results
Document:
SP289
Date:
October 1, 2012
Author(s):
Editors: Terence C. Holland, Pawan R. Gupta, V.M. Malhotra
Publication:
Symposium Papers
Volume:
289
Abstract:
This CD contains the proceedings from the Twelfth International Conference on Recent Advances in Concrete Technology and Sustainability Issues held in Prague, Czech Republic, in October 2012. The 34 papers include Advances in Geological CO2 Sequestration and Co-Sequestration with O2; Self-Compacting High-Performance Concretes; Dynamic Performance of Eco-Friendly Prestressed Concrete Sleeper; Parameters Influencing the Performance of Shrinkage-Compensating Concrete, and much more. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-289
DOI:
10.14359/51684136
SP289-19
September 14, 2012
Assia Djerbi Tegguer, Stephanie Bonnet, and Abdelhafid Khelidj
The goal of this research was to study the effects of crack width in concrete on chloride diffusion. Three different concretes were tested, one ordinary concrete (OC) and two high- performance concretes one made without silica fume (HPC) and the other with silica fume (HPCSF). The average crack widths, ranging from (1.1810-3 in. [30 μm] to 910-3 in. [250 μm]), were induced using a splitting tensile test. Chloride diffusion coefficients of concrete were evaluated using a steady state migration test. The results showed that the diffusion coefficient of uncracked HPCSF was less than HPC and OC, but cracking changed the material behavior in terms of chloride diffusion. The diffusion coefficient through cracked concrete, Dcr, is not dependent on material parameters and becomes constant when the crack width is higher than 310-3 in. (80 μm), at which point the value obtained is the diffusion coefficient in a free solution.
10.14359/51684268
SP289-17
Ramon Corral, Susana P. Arredondo, Jose M. Gomez, Diana C. Gamez, Jose M. Mendivil, and Jorge L. Almaral
Due to the significant environmental impact that the concrete production causes, and as a contribution to sustainability of this industry; presently some of the concrete constituents are replaced with alternative recycled materials. Chloride ingress into concrete is one of the main causes of electrochemical corrosion of reinforcement. Although there is an interest to use Recycled Concrete Aggregate (RCA) in concrete, its use is limited due to its detrimental effect on durability. Therefore in this research RCA and Supplementary Cementing Materials (SCM), such as Fly Ash (FA) and Silica Fume (SF), were used to produce durable and environmentally friendly concretes. They were evaluated based on their compressive strength, porosity, electrical resistivity and chloride-induced reinforcement corrosion when they were exposed to accelerated chloride conditions. The corrosion rates of steel embedded in these concretes were measured by the electrochemical impedance spectroscopy technique. The results indicated that concrete manufactured with 100% RCA are inferior to conventional concretes, but their performance can be improved by replacing Portland cement by 30% FA or 10% SF.
10.14359/51684266
SP289-18
Thano Drimalas, Jason H. Ideker, Anthony F. Bentivegna, Kevin J. Folliard, Benoit Fournier, and Michael D. A. Thomas
The effectiveness of lithium salts to prevent alkali-silica reaction (ASR) in laboratory samples has been known since the early 1950s; however, the long-term effectiveness of lithium on concrete in the field has not yet been established. This paper details the long-term exposure of large-scale concrete specimens and one monitored concrete pavement section subjected to outdoor field conditions containing either lithium hydroxide (LiOH) or lithium nitrate (LiNO3) as an admixture to control ASR. Four different locations were chosen to investigate the impact of varying climatic conditions on the progression of ASR in concrete, including three land-based sites: Austin, Texas (USA), Ottawa, Ontario (Canada), and one marine site at Treat Island off the coast of Eastport, Maine (USA). A concrete pavement containing lithium (LiOH) in New Mexico, USA, was also monitored for 18 years since placement. The results of these studies confirm that different dosages are needed depending on the aggregate mineralogy, based on realistic exposure conditions, and it may take up to 16 years (or even more) for some concretes to begin deteriorating based on exposure conditions and the reactivity of the aggregate. Combinations of lithium and fly ash have shown that both synergistically beneficial and detrimental effects (e.g. increased expansion) may occur.
10.14359/51684267
SP289-15
Stefano Maringoni, Alberto Meda, Serena Mostosi, and Paolo Riva
The possibility of using High Performance Fiber Reinforced Concrete for strengthening or repairing existing RC structures has been proposed in the last few years. The paper presents an overview of the different possible applications with this kind of technology. In particular, different materials, having different properties in terms of strength and workability, are available in order to optimize the application. In detail, self-leveling materials and thixotropic materials have been used. The use of jackets in High Performance Fiber Reinforced Concrete allows to increasing the bearing capacity, the stiffness and the durability of RC elements. A series of applications are presented and the obtained benefit are discussed.
10.14359/51684264
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