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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
SP289-25
September 14, 2012
Arnaud J.G. Bourlon, Jean-Baptiste d’Espinose, Eric Lecolier, and David Pasquier
Geopolymers constitute a potential sustainable alternative to Portland cement. They are amorphous silica-aluminates products of the reaction of metakaolin or fly ashes with an alkali silicate solution. The usage of geopolymer pastes as cementing materials is hindered by a lack of data, understanding and control concerning the rheology of the paste before hardening. As a first step, using diverse methods such as Nuclear Magnetic resonance (NMR) and Small Angle X-ray Scattering, we showed that the high viscosity of the alkali solutions can be rationalized by ion pairing and molar excess volume considerations. This allows further studies on the evolution of the rheology of the fresh geopolymer as a function of time and temperature and suggests possible ways to improve the workability of the geopolymer pastes.
10.14359/51684274
SP289-20
Simone E. Schulze and Jorg Rickert
In this research project several natural clays were examined in detail by X-Ray Fluorescence (XRF), Differential Thermal Analysis (DTA) and X-Ray Diffraction (XRD) to define optimal burning conditions to meet the requirements regarding the reactive silicon dioxide content of pozzolanic materials acc. to EN 197-1. The calcined samples were examined by means of Scanning Electron Microscopy (SEM), XRD and concerning their pozzolanic activity. Cements were made using the calcined clay with the highest reactivity as main constituents besides Portland cement clinker, respectively, and the cement performance according to EN 196 was examined. In summary, calcined clay may qualify as main constituent in cement. Its pozzolanic activity depends on the chemical and mineralogical composition of the starting material as well as the conditions of thermal treatment.
10.14359/51684269
SP289-21
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
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