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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 78 Abstracts search results
Document:
SP91-75
Date:
February 1, 1986
Author(s):
E. Douglas, P. R. Mainwaring, and R. T. Hemmings
Publication:
Symposium Papers
Volume:
91
Abstract:
Copper, nickel and lead slags of Canadian origin have been studied to evaluate the feasibility of their use as partial portland cement replacement in concrete and mine backfill. Pozzolanic activity of the slags was tested in mortars and the corresponding Ca(OH)2 and non-evaporable water contents at the same age were obtained by thermogravimetric analysis. The relationship between pozzolanic activity and glass content, measured by SEM and image analyzer, was assessed as well. It is concluded that non-ferrous slags could be used as partial Portland cement replacement in concrete and mine backfill if Portland cement and transportation costs justify it.
DOI:
10.14359/10134
SP91-74
John P. H. Frearson
Laboratory test programmes have been carried out to assess the sulphate resistance of various Portland and Portland blast-furnace slag cements and of Portland cements blended with ground granulated blast-furnace slag ('slag'). Slag contents of between 30% and 80% were used. The test method was based upon the German 'Flat Prism' test. Tests were carried out on mortars containing ground slag from two sources, also pulverjsed fuel-ash (pfa - 'fly ash'), and with Portland blast-furnace cements. Control specimens contained either ordinary or sulphate resisting Portland cements. Prisms were tested at water-cement ratios (w/c) ranging from 0.45 to 0.60, using constant cement contents mortars. Supplementary tests used w/c ranging from 0.40 to 0.60 and constant water content mortars. Results are now available for mortars which have been immersed in sodium sulphate solution for periods of up to 3 years. The results confirm the inferior resistance to sulphate attack of ordinary Portland cements and of blends of both ordinary and sulphate resisting Portland cement containing lower slag replacement levels. Sulphate resistance increased as the slag content increased, and the 70% slag content mortars were found to have a superior resistance to those containing sulphate resisting Portland cements alone. The influence of slag content on sulphate resistance was found to be more significant than that of the w/c in the range examined.
10.14359/10133
SP91-73
Ion Ionescu and Traian Ispas
Properties of heavy and light-weight concretes prepared with binders based on slag and activated ashes were studied as follows : fresh concrete; strength of concrete hardened both at normal temperature and by heat treatment; permeability and resistance to freeze-thaw cycling; behaviour of some concrete elements under various working conditions; preparation some technico-economic aspects related to and use of binders and practical conclu-sions for design and manufacture
10.14359/10132
SP91-72
D. W. S. Ho, I. Hinczak, J. J. Conroy, and R. K. Lewis
This paper explains the concept of water sorptivity as a measure of concrete quality and discusses the effect of interrupted curing (as distinct from continuous curing) on the quality of concrete. Results of a pilot study on concretes incorporating ground granulated blast-furnace slag either as a blend or as an intergrind are presented. It was found that the response to interrupted curing varied depending on the constituents of the concrete. Plain concrete (i.e. without chemical or mineral admixtures) with a 28-day strength of 28 MPa showed a very slow response to interrupted curing, but could be improved by the incorporation of slag or by specifying a higher 28-day strength.
10.14359/10131
SP91-71
G. G. Litvan and A. Meyer
Two experimental houses, one of ordinary portland cement (OPC) concrete and the other of granulated blast furnace slag cement (GBFSC) concrete, were built under carefully controlled and documented conditions. After 20 years of exposure, cores were analysed and significant carbonation to 40 mm in depth was detected by TGA and the wet chemical method. More significantly, little Ca(OH)2 was found in the GBFSC concrete at all levels, so that any reinforcing steel would have to be considered susceptible to corrosion. According to Hg porosimetry results, the porosity of OPC concrete decreased after carbonation but that of GBFSC remained unchanged. In addition, increased permeability of GBFSC concrete with carbonation was indicated by coarsening of the pores, and the tensile strength of the surface region suffered a large decrease.
10.14359/10130
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