Evaluation of the stiffness modulus and phase angle of cold in-place recycled mix- tures for long curing periods

Author(s): Bohdan Dolzycki (1), Mariusz Jaczewski (1) and Cezary Szydlowski
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 108-115
Total Pages: 8
Language : English

Abstract: Article presents the changes in behaviour of cold-in place recycling mixtures made using cement and bituminous emulsion (CIR mixtures) after an elongated time of curing. Most of the available literature regarding change in stiffness modulus and phase angle presents results for a maximum of several dozen days, which makes it difficult to predict the behaviour over the whole life of the compacted layer. The article presents the results of stiffness modulus and phase angle for cold in-place recycled mixtures after 3 years of curing. Nine different mixtures with different combinations of cement and bituminous emulsion were tested using Simple Performance Tester. Stiffness modulus and phase angle were measured for three temperatures (4°C, 20°C and 40°C) and for 9 different frequencies (from 0.01 Hz to 25 Hz). The obtained results confirmed that despite the strong action of hydraulic bonds and their increase over three years, CIR mixtures maintained intermediate behaviour between strictly elastic and viscoelastic. While for lower test temperatures of 4°C and 20°C a steady increase in stiffness modulus and a decrease in phase angle were observed with the time of curing, there were no changes in the values of both parameters measured at the temperature of 40°C. In terms of relative values, the observed changes were not remarkably high for such a long term and ranged up to 25%. Nevertheless, in all the tested cases, with the passing of operational time materials became more elastic, which can result in improved resistance to permanent deformation, but also in higher susceptibility to reflective cracking.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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