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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
SP289-23
Diana Bajare, Girts Bumanis, Genadij Shakhmenko, and Janis Justs
This paper deals with the incorporation of the grass bottom ashes from biomass burning process into the composition of conventional and high performance concretes. The grass bottom ashes were obtained from the different Latvian pellet furnaces where agricultural biomass like a reed straw, mixture of canary reed grass and wheat straw, wheat straw and barley straw were used as a heat power source. The obtained bottom ashes were ground down to micro-level using different milling times. Chemical composition of ground ashes was determined. Since the well-burned grass ashes contain amorphous components, they are active as pozzolanic materials. However, the pozzolanic nature and properties of ashes depend on the type of grass, the method of pre-treatment and calcinations such as burning temperature and duration, burning and cooling conditions. The effect of pozzolans on the properties of the concrete depends not only on the activity of pozzolanic reaction, but also from the structural point of view when the micro particles can improve the packing of concrete structure. The impact of grass ashes on the physical properties of fresh high performance and conventional concrete mixtures was tested. The compressive strength was tested after 7, 28 and 310 days of curing period. The water absorption was determined for hardened concrete.
10.14359/51684272
SP289-25
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
SP289-03
Tae-Hoon Koh, Young-Hoon Bae, Seon-Keun Hwang, and Myung Sagong
In Korea, high-early-strength Portland cement has been used for railway PC (Prestressed Concrete) sleeper to provide high strength and rapid hardening satisfactorily at early period. However, it is fact that carbon dioxide (CO2) emission from the cement production has been recently one of the main social issues. In this study, eco-friendly PC sleeper, which was developed in order to reduce the usage of cement and natural resources (fine aggregate) as main ingredients of concrete, was tested using UTM (Universal Testing Machine) test facility in order to estimate its dynamic performance optionally required by the European Standard. Based on a series of dynamic performance tests, it was found that eco-friendly PC sleeper can be an environmental as well as mechanical alternative to the ordinary PC sleeper.
10.14359/51684252
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