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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 40 Abstracts search results
Document:
SP242-07
Date:
April 1, 2007
Author(s):
M.I. Sanchez de Rojas, M. Frias, F.P. Marin, and J. Rivera
Publication:
Symposium Papers
Volume:
242
Abstract:
Industrial waste clay materials, which are good pozzolans, can be used in place of cement in the manufacture of mortars and concretes. During the manufacturing process, which involves dehydration followed by firing at controlled temperatures ranging from 700 °C to 1000 °C, the clay minerals found in high proportions in the natural materials used to make bricks and similar products acquire pozzolanic properties. The present study examines the microstructure and morphology of the industrial concrete made with standard portland cement containing fly ash partially substituted with waste clay material, by backscattered electron images (BSE) and mercury porosimetry (MP) techniques. The microstructure of concrete test samples is not altered by the inclusion of clay discards and the pore size did not vary too, the only difference found was a slight decline in the proportion of larger diameter pores (over 0.1 micron).
DOI:
10.14359/18706
SP242-08
M. Marroccoli, M. Nobili, A. Telesca, and G.L. Valenti
When used as a constituent of raw meal for cement kiln, electric arc furnace (EAF) slag, being a source of non-carbonated lime, can contribute to a sustainable development in as much as both the kiln thermal requirement and CO2 generation are reduced. Ternary mixtures containing limestone, clay, and EAF slag (up to 35%), as a partial substitute for both natural materials, were submitted to laboratory and industrial tests. Burnability indexes better than that given by the reference mix (without EAF slag) were obtained. Chemical, physical and mechanical parameters of cements made with EAF slag-derived clinkers met the European standard EN 197-1. The kiln emissions of SO2, CO, HCl, HF, metals, total solid particles, and organic carbon were lower than the concentration limits in the exhaust gas prescribed by the national environmental standards. Keywords:
10.14359/18707
SP242-03
E. Matsuo, K. Hino, and S. Hamada
In Japan, sea sand is used frequently as fine aggregate for concrete. The mining of sea sand has been more difficult year by year for environmental reasons. This would be a serious problem in manufacturing concrete. The amount of fly ash has been increasing gradually in Japan, therefore the utilization of fly ash as the substitution of fine aggregate has a significant advantage. In this study, bending fatigue test of roller compacted concrete was carried out, in which all fine aggregate was replaced with fly ash. The obtained S-N curve was compared with that of normal concrete and general roller compacted concrete. Scatter of fatigue strength was also determined.
10.14359/18702
SP242-04
S.J. Barnett, M.N. Soutsos, S.G. Millard, and J.H. Bungey
Sections of high strength concrete (target mean strength of 100 MPa) column elements were cast in the laboratory and cured in a temperature-controlled environmental room at conditions representing average summer or winter temperatures in the UK. In each case, the room was programmed to cycle with a 24-hour period between a minimum and a maximum temperature representing day and night variations. The elements were instrumented with embedded thermocouples and pull-out test inserts, for measurement of in situ strength. Temperatures were continuously recorded for at least seven days after casting. Strength development was assessed by means of both pull-out tests and compressive strength testing of drilled cores at ages up to 28 days. Temperature-matched curing of 100 mm cubes was also carried out using the thermocouple output measured from the column elements. In summer conditions, the temperature rise was observed to be lower in slag concretes than in portland cement concrete but despite this the measured strength development was significantly enhanced compared to standard cured (20 °C) control cubes. The in situ strength improvement was sufficient to allow slag concrete to be used in construction in summer without causing delays to fast-track construction schedules.
10.14359/18703
SP242-05
M. Cyr, R. Idir, G. Escadeillas, S. Julien, and N. Menchon
This study concerns the possibility of reusing two industrial by-products from combustion processes (MSWIFA -- Municipal Solid Waste Incineration Fly Ash and SSA -- Sewage Sludge Ash) in cement-based materials containing metakaolin. The experimental program included tests on mortars to evaluate the impact of ternary binders (cement, metakaolin and residue) on the technological and environmental properties of concrete intended for non-structural applications. The binders were composed of 75% cement, 22.5% metakaolin and 2.5% residue. Results on the technological and environmental behaviour of mortars showed that the mechanical, dimensional and leaching properties were not affected by the residues. The use of metakaolin especially led to a significant decrease in soluble fractions and heavy metals released from the binder matrix.
10.14359/18704
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