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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
SP289-12
September 14, 2012
Tonatiuh Rodriguez-Nikl, Joshua W. Christiansen, and Kelli Walters
A method is presented for systematically comparing the environmental impacts of different structural designs. While green (environmentally less invasive) designs may be appealing based on environmental considerations, they are inherently less reliable due to lack of knowledge about their behavior; this may require greater material use to provide the same level of reliability. A probabilistic approach is used to determine design options with equal reliability; environmental impacts are then compared by life cycle assessment (LCA). This approach is applied to a reinforced concrete bridge in a costal, seismic region. Three mix designs are considered: conventional, high fly ash, and recycled aggregate. Mechanical, chloride corrosion, and seismic hazard properties are treated as random variables. Conclusions are drawn about the environmental credentials of the three options. More importantly, the method is established as useful for making meaningful comparisons of the environmental impacts of different structural materials and designs.
10.14359/51684261
SP289-13
Bruce J. Christensen and Christian Huebsch
There are a number of the current and developing solutions to support more sustainable construction. Highly fluid concretes in the 30 MPa (4500 psi) strength class are now available to support faster construction, more durable elements, use of higher filler contents, and lower waste contents. Concretes with supplementary cement contents of as high as 80% of the binder with similar setting and strength characteristics to conventional OPC systems are now possible, further reducing the carbon footprint of concrete. Precast concretes that develop stripping strengths in a matter of a few hours significantly reduce the energy consumption for curing and also facilitate the use of higher filler contents. Wall systems with thermal conductivities 2-3 times lower than conventional materials are now becoming commercially available, which can further reduce the energy consumed for heating and cooling during the life of a structure. A common element of the solutions mentioned here is that they are enabled by latest technology construction chemicals.
10.14359/51684262
SP289-14
Marek Foglar, Martin Kovar, and Alena Kohoutkova
According to recent publications, from 2005 to 2008 there were more than 13000 terrorist attacks around the world, which took more than 73000 human lives. The attacks were targeted mainly on the technical and civic infrastructure, like governmental buildings, bridges, etc. Due to improved ductility, fibre-reinforced concrete (FRC) shows better performance under blast and impact loading compared to conventionally reinforced concrete. Field tests of FRC and reinforced concrete specimens were performed in cooperation with the Czech Army Corps and Police of the Czech Republic in the military training area Boletice. The test were performed using real scale precast slabs and 25 kg (55.125 lb) of TNT charges placed at distance from the slab for better simulation of real in-situ conditions. The paper presents conclusions from two sets of tests and results of their numerical evaluation.
10.14359/51684263
SP289-09
Giorgio Ferrari, Alberto Brocchi, Fiorenza Cella, Maria Chiara Dalconi, and Federico Longhi
The paper describes a new technology for recycling residual fresh concrete at the ready-mixed plant, which transforms the unset residual concrete from the construction site into granular materials, in short period of time and without production of waste. The method employs organic polymers and setting accelerators, which are added directly into the truck mixer and transform the residual concrete into aggregates which, after curing, can be reused for the production of new concrete. The new technology represents a significant contribution to the area of reduction of waste at the ready-mixed plant. It also contributes to the protection of natural resources, in accordance with the guidelines of the European Directive on wastes.
10.14359/51684258
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