This paper presents an alternative approach for interpreting data collected with the traffic speed deflectometer (TSD). Although the idea of measuring pavement deflections at traffic speeds in a continuous manner is not new, worldwide interest is recent, in part because of the availability of a commercial TSD device. As with any new device, there is a need for robust, scientifically sound, yet practical interpretation procedures. This paper describes the details of such a procedure recently developed at the Road and Bridge Research Institute in Poland. In addition to a detailed description of the proposed algorithm and its unique features, this study demonstrates an example application that uses data collected by the TSD operated by the Road and Bridge Research Institute. The proposed approach can be successfully applied to the TSD data and allows for deep customization for a user's and customer's needs and applications.
Asphalt pavement construction technology is an industry branch that undergoes constant development. Analyzing the directions of the development, one can divide it into two mainstreams: the development of roadworks equipment and the development of roadworks technology. Microwave heating technique has been mentioned in the road industry from the early ‘70s, but research records from practical full-scale use are very rare. This article presents the evaluation of the possible use of microwave heating technique during a particular aspect of the construction process, namely, the formation of longitudinal joints and the potential repair process of the cracked asphalt pavement. Research results showed that joints constructed using microwave-assisted heating performed the same or even better with regards to tensile characteristics comparing to other techniques. Also, the highest level of compaction was reached among the other tested techniques applied to the wearing course level. The second part of the research experiment showed the large potential of the microwave crack healing technique. The asphalt pavement was healed on its full depth of 10 cm with the single healing operation applied. Although some limitations may occur in the practical use of microwave heating, the test results suggest that it is a very promising technique and should be further developed (for, e.g., shielding concerns, electricity supply). The microwave heating technique is powered with electricity, which is important when there is a constant need for further reductions of CO2 emissions. It can be reached in parallel with clean energy or clean electricity sources.
This paper presents the elements of a Pavement Management System with a particular focus on the initial effort to create a comprehensive data archive and its further application in four different maintenance strategies. Pavement performance indicators including longitudinal and transverse cracking as well as roughness were investigated with respect to numerous distinct factors which can be grouped into three categories, i.e. climatic, pavement structure, and traffic-related. High-quality climatic data was obtained from the national weather stations in Connecticut. Maintenance and construction data was used to determine the pavement age and structure amongst several other factors. Traffic data was acquired from the state records and accumulated traffic loading was estimated for all segments based on their age. High definition pavement images collected by the Automatic Road Analyzer vehicle in 2010 were used to quantify the longitudinal and transverse cracking with respect to their location within the pavement surface. Elements of the Pavement Management System with stochastic elements were created from this data and analyzed in order to demonstrate the budget implications under four different management scenarios. Scenarios varied by the trigger values of the Pavement Condition Index for considered maintenance treatments. The 20-year projection analysis clearly showed the benefit of repairing pavements that are still in a good condition even without considering related user-delay costs and/or vehicle-operation costs which would only heighten the differences between scenarios.
This paper presents recent study on the moisture susceptibility of asphalt mixtures under various water and frost conditioning. Moisture susceptibility of asphalt mixture is a very important property influencing significantly pavement durability. In particular, asphalt layers are subjected to a deterioration factor which is traffic independent-water and frost/thaw cycles. It is a common practice that during the mix design process qualitative experiments are conducted in order to assess the moisture resistance of trial mixes. Therefore there is a need for a suitable, validated and generally accepted method. This paper presents the results of the extensive research study conducted recently in Poland to compare several different testing protocols and associated requirements for the moisture sensitivity. Different aspects of the asphalt mixtures were investigated, in particular aggregate type, anti-stripping agent and bitumen type. Specimens for the moisture susceptibility were conditioned using four methods including an original method comprising the frost/thaw cycles as well as AASHTO T-283 protocol. In addition to the standard evaluation of the indirect tensile strength, there were several performance based tests conducted in the laboratory on the specimens before and after the conditioning procedures. The analysis shown in this paper lead to the development of the alternative specifications for the moisture susceptibility in Poland.
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