Abstract
The effect of compaction degree and binder content on performance properties of asphalt mixtures of an asphalt concrete type for wearing and binder courses are described in the paper. Measurements of stiffness modulus by two-point bending test on trapezoidal shaped specimens, fatigue characteristics, and resistance against frost cracking by thermal stress restrained specimen test have been performed on selected asphalt mixtures. The main aim of the experimental part was to determine to what extent the performance properties of the individual mixtures will be affected when decreasing the compaction degree by 3% in comparison to the optimal design, i.e. from 100% to 97% degree of compaction. This decrease simulates incomplete degree of compaction of courses during pavement construction, which is common and accepted during acceptance tests and it is in accordance with the Czech regulations. Then, the decreased dosage of binder content by 0.5% is simulated, which is the boundary parameter for lowering the binder content within the acceptance test. The results of performance testing have been affected by lower compaction degree and lower binder content have been used as course parameters and integrated into a mathematical model of a commonly used pavement construction, which is presented by a multi-layered linear elastic model based on the use of Burmister‘s equations. The outcome of the paper is a description of the effect of lower degree of compaction and lower binder dosage on the lifetime of a pavement construction.
Highlights
The fundamental requirement of a pavement construction is safe, fast and comfortable traffic flow with minimal effects on the environment and with limited construction disruption (Pellinen et al 2009; Petkevičius, Petkevičienė2014)
The factor with largest effect on frequency sensitivity turned out to be the actual composition of the asphalt mixture, i.e. the aggregate gradation and the corresponding binder content: ratio of stiffness modulus determined at 25 Hz frequency and stiffness modulus determined at a frequency of 5 Hz of I a sieve size less than 11 mm (AC 11) type mixture was 1.18 (1.17 for mixture I AC 16), in case of mixture
The results of the stiffness tests show that increasing the frequency leads to increase in stiffness modulus of the mixtures
Summary
The fundamental requirement of a pavement construction is safe, fast and comfortable traffic flow with minimal effects on the environment and with limited construction disruption The degree of compaction of asphalt layers and binder content have a major effect over the course of the entire pavement construction lifetime and on the costs during its life cycle (Beckedahl 2008). This paper describes the degree of decrease of selected performance parameters and their effects on shortening of the overall asphalt pavement construction lifetime, if the parameters, included in the standard, are on its lower limit of tolerance. Mixtures have been chosen from a sieve curve range of asphalt concretes for wearing courses with a sieve size less than 11 mm (AC 11) and asphalt concrete for binder courses with sieve sizes less than 16 mm (AC 16) They are defined in the Czech national appendix of the European harmonized material standard EN 13108-1 Bituminous. Hyzl et al The Effect of Compaction Degree and Binder Content
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