A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Quality Management of Asphalt-Concrete Layers Using Wave Propagation Techniques
Highway agencies send significant amounts of money and time coring and in-situ testing flexible pavements to implement a rigorous quality control/quality assurance program. The quality of the asphalt concrete (AC) pavement is assessed through field inspections, laboratory testing of pavement cores, thickness determinations, and compacted density measurements. To successfully implement a mechanistic pavement design procedure or to develop realistic performance-based specifications, a method of monitoring the modulus of a laid-down AC layer is needed. The modulus of an AC layer can be either indirectly predicted by using physical and volumetric properties of the mixture, which are measured in the laboratory, or obtained directly from field testing. Seismic nondestructive testing methods can potentially offer an efficient, economical, reliable, and repeatable way of measuring the modulus of AC layers. In addition, seismic methods are the only means of measuring the same moduli in the field and in the laboratory. In this study, a laboratory method and a field seismic method for determining the modulus of AC layers are introduced, and their instrumentation and theoretical aspects are presented. The impacts of the gradation, asphalt viscosity (asphalt grade), void in total mix, temperature, and thickness of the AC layer on the modulus are introduction. The preliminary protocol proposed for quality management of AC, based on seismic methods, is included.
Quality Management of Asphalt-Concrete Layers Using Wave Propagation Techniques
Highway agencies send significant amounts of money and time coring and in-situ testing flexible pavements to implement a rigorous quality control/quality assurance program. The quality of the asphalt concrete (AC) pavement is assessed through field inspections, laboratory testing of pavement cores, thickness determinations, and compacted density measurements. To successfully implement a mechanistic pavement design procedure or to develop realistic performance-based specifications, a method of monitoring the modulus of a laid-down AC layer is needed. The modulus of an AC layer can be either indirectly predicted by using physical and volumetric properties of the mixture, which are measured in the laboratory, or obtained directly from field testing. Seismic nondestructive testing methods can potentially offer an efficient, economical, reliable, and repeatable way of measuring the modulus of AC layers. In addition, seismic methods are the only means of measuring the same moduli in the field and in the laboratory. In this study, a laboratory method and a field seismic method for determining the modulus of AC layers are introduced, and their instrumentation and theoretical aspects are presented. The impacts of the gradation, asphalt viscosity (asphalt grade), void in total mix, temperature, and thickness of the AC layer on the modulus are introduction. The preliminary protocol proposed for quality management of AC, based on seismic methods, is included.
Quality Management of Asphalt-Concrete Layers Using Wave Propagation Techniques
J. Rojas (author) / S. Nazarian (author) / V. Tandon (author) / D. Yuan (author)
1999
154 pages
Report
No indication
English
Quality Management of Asphalt Concrete Layers Using Wave Propagation Techniques
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