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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
SP289-16
September 14, 2012
Valeria Corinaldesi and Giacomo Moriconi
In this work an attempt was made to reuse wooden waste for producing lightweight mortars by replacing natural sand. In fact, manufacturers of wooden product and furniture generate sawdust and offcuts. These are produced by cutting, drilling and milling operations where wood is removed from a finished product; they are often collected in filter bags or dust collectors. Three different percentages of substitution have been tried: 2.5%, 5% and 10% by volume of sand. Wooden waste was always pre-soaked in water and sometimes in calcium hydroxide aqueous solution in order to obtain wood mineralization before adding it to the mortar mixture. Mortars containing wooden waste were characterized by means of compression and bending tests, free drying shrinkage and thermal conductivity measurements. Results obtained showed that a maximum dosage of 5% wooden waste should be used in order to avoid an excessive loss of mortar mechanical strength, by reducing thermal conductivity of about 25%.
10.14359/51684265
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
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
SP289-27
Ozlem Akalin and Bahar Sennaroglu
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.
10.14359/51684276
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