THE INFLUENCE OF AIR VOID CHARACTERISTICS ON THE FEEZE-THAW-SALT RESISTANCE OF PAVEMENT CONCRETES

Author: Aljoša Šajna, Lado Bras
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference Segment on Frost Action in Concrete
Editor(s): Marianne Tange Hasholt, Katja Fridh and R. Doug Hooton
ISBN:978-2-35158-182-7
e-ISBN:978-2-35158-183-4
Publisher:RILEM Publications SARL
Publication year:2016
Pages:132-141
Total Pages:10
Language:English

Abstract: As part of renovation works being presently carried out in the centre of Ljubljana, Slovenia, some concrete pavements with additional architectural requirements were laid. According to the valid Slovenian technical specifications, wearing layers of concrete pavements have to be made from freeze-thaw-salt (FTS) resistant concrete. This resistance has to be proved according to the provisions of the Slovenian supplement to the standard EN 206, i.e. SIST 1026. Since testing according to SIST 1026 is time-consuming, complementary test methods, based on the determination of air void size characteristics, were used during the concrete mix optimization process. Beside an air entraining agent, a superplasticizer, a shrinkage reducing admixture and microsilica were used to fulfil all the requirements for concrete.
In the paper the results of FTS performance tests carried out on selected pavement concretes are presented. These results are compared to the measured entrained air void characteristics, determined according to EN 12350-7 and EN 480-11, and also by means of an Air Void
Analyser. Although all the admixtures were produced by the same manufacturer, in some cases their unexpected incompatibility resulted in an inadequate air void structure and hence inadequate FTS resistance of the concrete.

Online publication:2016
Publication type:full_text
Public price (Euros):0.00