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Home > Publications > 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
SP289-21
September 14, 2012
Salah Altoubat and Deena Badran
The use of Ground Granulated Blast Furnace Slag (GGBS) in Self Compacting Concrete (SCC) has become an alternative choice to improve the fresh properties and to reduce the amount of cement. Such use of GGBS has also been recognized as a mean toward a more sustainable and green construction. This paper presents experimental results from restrained shrinkage tests that were used to assess the cracking potential of various SCC Mixes. The effects of GGBS proportion, degree of restraint and curing regime are specifically addressed in this paper. The GGBS was added to replace the cement by up to 70% and the restrained shrinkage cracking was investigated using two types of standard rings; ASTM and AASHTO rings, which provide two different degrees of restraint. The results revealed that the cracking potential of the SCC mixes was affected significantly by the proportion of GGBS, curing regime and degree of restraint. The results suggest optimum proportions of GGBS for different degrees for restraints.
10.14359/51684270
SP289-22
Syed Ali Rizwan, Sajjad Ahmad, and Thomas A. Bier
This study reports the effects of packing of aggregate phase on the fresh and hardened state properties of high performance self-consolidating mortar (SCM) systems. The sands of five different gradings were utilized in this study. The final grading curves were obtained using Modified Andreassen model by varying its distribution modulus (q) from 0.20 to 0.50 so as to find its optimum value for maximum packing density of aggregate phase. The experimental results showed that the maximum packing density of sand used in research occurs when the distribution modulus (q) has a value of 0.35 in the Modified Andreassen model and that the total flow of the self-consolidating mortar (SCM) formulations increased with the increase in the packing density of sand in the SCM formulations while the V-funnel time reduced. The strength results showed improvement with higher packing degrees of mixes.
10.14359/51684271
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
SP289-19
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
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