Study of the mechanical behavior of asphalt mixtures in terms of creep and Superpave compaction parameters

Abstract

This was a study on the mechanical behavior of hot asphalt mixtures with regard to permanent deformation, considering static creep tests and the parameters derived from the Superpave compaction curve. For the asphalt mixture production, mineral aggregates and two types of asphalt binder (CAP 50/70 and AMP 60/85) were used. These mixtures were designed using the Superpave methodology and compacted in the content and number of gyrations according to the design. For the design condition, asphalt mixtures using the conventional CAP 50/70 asphalt binder showed better workability and lower deformation than asphalt mixtures with the AMP 60/85 polymer binder. Furthermore, the influence of asphalt binder content on the behavior of asphalt mixtures in relation to permanent deformation and compaction indices was studied, considering the maximum number of gyrations in the design. Regarding this investigation, asphalt mixtures with higher asphalt binder content tend to show higher permanent deformation and better workability. Complementarily, the compaction curve indices (Construction Densification Index, CDI; modified Traffic Densification Index, TDIm and Locking Point, LP) were correlated with parameters obtained from static creep tests (total deformation after the recovery period, Dt; creep modulus, CM and curve inclination, Icurve) through curves obtained by the correlation between these indices. Based on this analysis, a good correlation was found between the results of static creep tests and compaction indices, showing the potential of these indices for predicting the mechanical behavior of the analyzed mixtures in relation to the development of permanent deformations.

A Study of Superpave Design Gyrations for High Traffic Surface Mixtures

“…For fatigue and rutting, relative performance indicators were constructed using a control or base level that indicates the maximum performance of the mixture. Performance is defined as the number of ESALs required to attain failure for a given distress, where failure limits are specified as 10% cracking of the entire fatigue place and 6.35 mm permanent deformation of AC layer for rutting [ [12], [13], [14]]. The control fatigue performance, PFatigue, will be clear at 50 gyartions fatigue life measurement, as the mix design results in a higher asphalt content, which makes the asphalt concrete layer more flexible and therefore more resistant to fatigue cracking.…”

An advanced method for the development of highly reliable asphalt concrete mixture

“…For example, some roads are predominantly used by passenger cars, others by large vehicles. On some roads, the volume of traffic rarely changes throughout the year, in others, it depends on seasonal activities such as harvesting and transporting crops from agricultural enterprises [ [5], [6], [7]]. For this reason, for each specific road, road builders develop individual asphalt mixes.…”

Evaluation of mechanical properties for stone mastic asphalt containing textile waste

“…It is necessary to carry out maintenance and repair operations in terms of the continuity of transportation. In such cases, there will be an additional cost to the country's economy [11][12][13]. Stone mastic asphalt mixtures, which show higher resistance to negative effects, have started to be used more widely in our country in recent years in order to reduce the deterioration and the total costs [14].…”