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Evaluation of the stiffness modulus and phase angle of cold in-place recycled mix-tures for long curing periods
Abstract
Article presents the changes inbehaviour of cold-in place recycling mixtures made using cement and bituminous emulsion (CIR mixtures) after anelongated time of curing. Most of the available literatureregarding change instiffness modulus and phase angle presents resultsfor a maximum of several dozen days,which makesit 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°Cand 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 strictlyelastic and viscoelastic. While for lower test temperatures of 4°Cand 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 atthe temperature of 40°C. In termsof relative values, theobserved changes were notremarkablyhigh for such a long term and ranged up to 25%. Nevertheless,in all the tested cases,with the passingof operational timematerialsbecame more elastic, which can result in improved resistance to permanent deformation, but also inhigher susceptibility to reflective cracking.
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Details
- Category:
- Conference activity
- Type:
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Title of issue:
- Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials strony 84 - 91
- Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Dołżycki B., Jaczewski M., Szydłowski C.: Evaluation of the stiffness modulus and phase angle of cold in-place recycled mix-tures for long curing periods// Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials/ ed. Marijana Serdar, Nina Štirmer, John Provis Paris: RILEM Publications S.A.R.L., 2019, s.84-91
- Verified by:
- Gdańsk University of Technology
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