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International Concrete Abstracts Portal

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


Document: 

SP289-12

Date: 

September 14, 2012

Author(s):

Tonatiuh Rodriguez-Nikl, Joshua W. Christiansen, and Kelli Walters

Publication:

Symposium Papers

Volume:

289

Abstract:

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.

DOI:

10.14359/51684261


Document: 

SP289-05

Date: 

September 14, 2012

Author(s):

Aniello Palmieri, Stijn Matthys, and Luc Taerwe

Publication:

Symposium Papers

Volume:

289

Abstract:

The use of near surface mounted (NSM) fibers reinforced polymers (FRP) is being increasingly recognized as a valid technique for repairing and strengthening of concrete members. As this technology emerges, the structural behavior of NSM FRP strengthened elements needs to be characterized, and bond between NSM FRP bars and concrete is the first issue to be addressed. This paper presents the results of a series of 18 double shear tests on NSM FRP strengthened concrete. Aim of the project is to investigate the feasibility of the adopted test method and to investigate the mechanism of bond between NSM reinforcement and substrate material. Experimental results confirm the efficiency and reliability of the test method and the bond effectiveness of the NSM technique. Moreover, a local bond stress-slip relationship is determined based on experimental results and the outcome of a numerical investigation obtained from the DIANA TNO finite element analysis.

DOI:

10.14359/51684254


Document: 

SP289-27

Date: 

September 14, 2012

Author(s):

Ozlem Akalin and Bahar Sennaroglu

Publication:

Symposium Papers

Volume:

289

Abstract:

High strength self-compacting concrete (HS-SCC) has increasing demand in infrastructure works where high compressive strength of up to 100 MPa is achieved with a special type of superfluid concrete mixture. SCC was developed in Japan at the end of the 1990’s and the scientific rules to manufacture SCC were developed by Japanese Scientists. Concrete mixture proportions for HS-SCC have been varied widely depending on many factors and sensitive interactions between components. Statistical mixture design (SMD) methods can be used to enhance our understanding of concrete mixtures by providing cost effective fresh and hardened concrete properties. In this study, the optimization results of HS-SCC mixture proportions in C100/115 concrete class using SMD methods were compared with the scientific rules of Okamura and coworkers to manufacture SCC. As a result of this study, suggested concrete mixture proportions through SMD method were confirmed by Okamura’s Rules.

DOI:

10.14359/51684276


Document: 

SP289-28

Date: 

September 14, 2012

Author(s):

B. Benabed, S. Kenai, L. Azzouz, E. Kadri, and A. S. E. Belaidi

Publication:

Symposium Papers

Volume:

289

Abstract:

Limestone quarry dusts are fine materials obtained during the process of crushing rock to produce gravel. The effects of dust content in crushed limestone sand on the properties of fresh and hardened self-compacting mortar are not well known. An experimental study was undertaken to find out the effect limestone dust content on the properties of fresh and hardened self-compacting mortar (SCM). SCM mixtures were prepared using crushed limestone sand partially replaced with limestone dust at varying percentages (0, 5, 10, 15, 20, 25 and 30%). Tests used to characterize the properties of mortars include: slump flow, flow time, viscosity measurements, compressive strength and flexural strength at 3 and 28 days of age. Results indicate that the crushed limestone dust significantly improves the rheological and mechanical properties of SCM with a content ranging from 10 to 15% of limestone dust.

DOI:

10.14359/51684277


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