Investigation of frost resistance of cementless composite concrete by dilatometric way
Title: Investigation of frost resistance of cementless composite concrete by dilatometric way
Author(s): S.I. Pavlenko, P.G. Kuvshinov, T.M. Luhanina
Paper category : conference
Book title: International RILEM Workshop on Frost Resistance of Concrete
Editor(s): M. J. Setzer, R. Auberg and H. - J. Keck
Publisher: RILEM Publications SARL
Publication year: 2002
Pages: 295 - 302
Total Pages: 8
Nb references: 7
Abstract: In department "Building production" of SSUI the cementless fine-grained concrete in-tended for operation in non-aggressive media has been developed. All components of this concrete are the wastes of industry: high-calcium ash of Abakancky TPP - 1000 kg/m3; slag sand of 0...5 mm fraction of the same TPP - 1000 kg/m3; ferroalloy dust (silica fume) - 70...100 kg/m3; water for hardening with temperature +60...800C - 400 kg/m3.
One of the main properties, providing the durability of concrete, used in conditions of negative temperatures of outer air, is frost-resistance.
Frost-resistance of concrete was investigated by dilatometric method in laboratory of TSMIPKS-tests according to GOST 10060.3-95 on specimen-cubes of 10x10x10 cm in size at the age of 28 days (after heat-treatment of concrete). The essence of method is as follows:
- Saturated specimen of concrete is placed into measurable chamber of dilatometer, the standard concrete is placed into the second chamber, the chambers are filled with kerosene and sealed.
- Dilatometer with specimens is installed in refrigerator chamber and one withstands 30 minutes, then freezing at speed 0.30C/min begins up to reaching the temperature with minus 18+-20C. Graph plotted during freezing continuously fixes the difference curve of volumetric deformations of concrete and standard specimens.
- Brand of concrete on frost-resistance, expressed in cycles of variable freezing and thawing-out in water, is defined on maximum relative difference of volumetric deforma¬tions of specimens with account of concrete type, form and size of specimens according to GOST 10060.3-95.
Dilatometric method of speedy determination of frost-resistance allows to increase greately the time of tests in comparison with earlier-existing methods and to estimate more correctly the results of tests.
Online publication: 2010-06-28
Publication type : full_text
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