Although the elastic modulus of various HMA mix types is rather well-defined, tests can determine how elastic and resilient modulus varies with temperature. Also, many deformation resistance tests can also determine elastic or resilient modulus. Moisture susceptibility. Certain combinations of aggregate and asphalt binder can be susceptible to ...
ABSTRACT. Relaxation Modulus (RM) is one of the mechanical properties that can be utilized to model the visco-elastic behavior of Hot-Mix Asphalt (HMA) for various purposes including material response analysis, design, and performance prediction.
Stiffness of Hot-Mix Asphalt Introduction This research was initiated from a need to evaluate marginal mixtures that do not meet the Superpave mix design criteria for the air voids content requirements for the construction of hot mix asphalt (HMA) pavements. The asphalt mixture verification at the asphalt plant is conducted by compacting plant-
a statistical dynamic modulus model of hot mix asphalt using joint estimation and mixed-effects accounting for effects of confinement, moisture and additives a dissertation submitted to the graduate division of the university of hawai'i at mᾹnoa in partial fulfillment of the requirements for the degree of doctor of philosophy in
USE OF STIFFNESS OF HOT-MIX ASPHALT AS A SIMPLE PERFORMANCE TEST. The objective was to determine whether the stiffness of a mix could be used as a simple performance test (SPT) parameter to complement the Superpave (Registered trademark) volumetric mix design. ... modulus E*, simple shear tester (SST) shear (complex) modulus G*, and dynamic ...
RESEARCH ARTICLE Engineering characterisation of epoxidized natural rubber-modified hot-mix asphalt Ramez A. Al-Mansob1, Amiruddin Ismail1*, Nur Izzi Md. Yusoff1, Riza Atiq O. K. Rahmat1, Muhamad Nazri Borhan1, Shaban Ismael Albrka1, Che Husna Azhari2, Mohamed Rehan Karim3 1 Sustainable Urban Transport Research Centre (SUTRA), Department of Civil and Structural …
In general, an increase in the fines proportion (if not used in excess i.e. ≤8%) contributes towards the improvement of mechanical properties of asphalt mix by decreasing the elastic deformation, and consequently, increasing the modulus of rigidity of HMA mix, increasing the resistance to rupture and shearing, improving the cohesion at low ...
KEY WORDS: Dynamic modulus, resilient modulus, conversion, asphalt mixtures. 1 INTRODUCTION With the transition from the 1993 Pavement Design Guide to the new Mechanistic-Empirical Pavement Design Guide (MEPDG) of the American Association of State Highway and Transportation Officials (AASHTO), the widely used hot-mix asphalt (HMA) material
Elastic Modulus, (ksi) Material Good Fair Poor Dense-Graded Hot Mix Asphalt Concrete (HMAC)1 500 Performance Design HMAC1 650 - 800 Flexible Base2 75 50 25 Cement Stabilized Base 350 150 75 Lime Stabilized Base 75-200 40-75 less than 40 Cement Stabilized Subgrade 50 Lime Stabilized Subgrade 50 Subgrade Soils 12-16 8-12 4-8
Modulus of Hot Mix Asphalt Figure 2 – Black Space Diagrams: a) Non-linearity 9.5mm Mix; b) SPT's 8 Only - 9.5mm; c) Non-SPT - 25mm; d) SPT's Only - 25mm Figure 3 – Master Stiffness Curve for Labs #2, #5, #6, and #7 for the 10 25mm Mix Figure 4 – Percent Variance Components for E* …
The primary objective of this project was to examine the elastic modulus parameter for hot mix asphalt (HMA) materials typically used in New Zealand. Elastic modulus parameters obtained from flexure and indirect tensile tests (ITT) were compared with published presumptive values and the results of analyses using the Shell Bands software. The
Concrete properties – Modulus of Elasticity (Ec) and Modulus of Rupture (S'c). S'c is the 28 day Flexural Strength of the concrete. ... Hot Mix Asphalt with Type A Aggregate 0.44
Research on the dynamic modulus found that the incorporation of rubber powder increases the elastic properties of the mixture such that the rubber-powder-modified asphalt mixture had a higher dynamic modulus. At the same time, the high-dosage-modified asphalt mixture was found to be closer to an elastomer under a low temperature and high frequency.
The dynamic modulus (|E m *|) of asphalt mixtures is one of most fundamental mechanical parameters used in flexible pavement design, which has been extensively estimated through various predictive models. However, most of existing dynamic modulus predictive models does not fit well for the purpose of the Level 3 (the lowest input level) flexible pavement design in the current …
High Modulus Asphalt (HiMA) mix with a 20/30 penetration grade binder Medium continuously graded mix with a 60/70 penetration grade binder, and Bitumen-rubber asphalt semi-open graded mix (BRASO). The HMA mixes were designed by Much Asphalt and prepared at the CSIR pavement material testing laboratory. 3.2 Dynamic modulus testing
input parameters to conduct the elastic layer analysis; 1) Modulus and 2) Poisson's Ratio. To date many people have assumed that the Poisson's Ratio is a constant value for most, if not all, materials; Limited research has shown the Poisson's Ratio of hot mix asphalt (HMA) can …
The results show that elastic modulus can assess the effect of water damage on asphalt concrete, aging of asphalt concrete has a significant effect at more than 4 days immersion, and the optimum ...
asphalt warm mixture and added the same to the mixture at about 0.3% of its weight, which resulted in a reduction of the production temperature by about 30oC as compared to the control mixture [6]. The resilient modulus is the elastic modulus which is related to the theory of elasticity.
KTMR-34 DETERMINING DYNAMIC MODULUS OF HOT-MIX ASPHALT CONCRETE AND COLD-IN-PLACE RECYCLE MIXTURES (Kansas Test Method KTMR-34) A. SCOPE This test method covers procedures for preparing and testing asphalt concrete mixtures to determine the dynamic modulus and phase angle over a range of temperatures and loading frequencies.
Dynamic modulus (∣ E * ∣) of hot-mix asphalt (HMA) mixtures is one of the fundamental engineering properties measured by the simple performance tester and has also been incorporated as a basic input into the American Association of State Highway and Transportation Officials Mechanistic-Empirical Design Guide for flexible pavements. Although direct laboratory testing and empirical …
Abstract. A methodology for determining the degree of aging of hot-mix asphalt (HMA) is presented. The evaluation of aging involves relating the wave propagation velocities to the elastic modulus of the mixture, before and after aging. The nondestructive nature of the methodology and its high degree of repeatability make it attractive to ...
Pellinen, T., and Witczak, M. W. Assessing the Ultrasonic Pulse Velocity Technique for Measuring the Elastic Modulus of Asphalt Concrete, Superpave Support and Performance Models Management. NCHRP 9-19, Technical Team Report. Department of Civil Engineering, University of Maryland, College Park, 1999. Google Scholar
The distresses of asphalt pavement, which include fatigue, rutting, and low temperature cracking, are related to the elastic modulus of asphalt concrete (AC). In addition, the elastic modulus of AC is a design variable for asphalt pavement structural design when elastic-layer system theory is employed.
RESILIENT MODULUS AND THE FATIGUE PROPERTIES OF KANSAS HOT MIX ASPHALT MIXES Stefan A. Romanoschi, Ph.D., P.E. Nicoleta I. Dumitru Octavian Dumitru Kansas State University Manhattan, Kansas AUGUST 2006 K-TRAN A COOPERATIVE TRANSPORTATION RESEARCH PROGRAM BETWEEN: KANSAS DEPARTMENT OF TRANSPORTATION KANSAS STATE …
Comparing Resilient Modulus and Dynamic Modulus of Hot-Mix Asphalt as Material Properties for Flexible Pavement Design. With the current trend toward developing mechanistic flexible pavement design and the need for more reliable design procedures, accurate characterization of hot-mix asphalt (HMA) properties is needed.
measuring and evaluating modulus of elasticity of asphalt, asphalt concrete wikipedia, the influence of rheological properties of bitumen with, resilient ... use of recycled concrete in hot mix asphalt and an ann, resilient modulus of unbound and bituminous h a d hr, modelling workability of asphalt concrete performance at, resilient modulus ...
The resulting rheology of the composite material — hot mix asphalt — is significantly shifted from that of the asphalt binder. Rheology of binders and mixtures has been evaluated by testing, which includes Dynamic Shear Rheometer (DSR) and …
smaller resilient modulus value, which in turn results in a more conservative design. It was found that the difference in resilient modulus at load magnitude of 1000 and 2700 N was as great as 4 % for the specimens prepared with asphalt content of 4%[5]. Loulizi et al. (2002) concluded that hot mix asphalt being a visco-elastic
The NCHRP Project 1-37A "Guide for Mechanistic–Empirical Design of New and Rehabilitated Pavement Structures" introduces the dynamic modulus (|E*|) as the material property for the characterization of hot-mix asphalt mixtures. This is a significant change from the resilient modulus used in the previous AASHTO "Guide for the Design of Pavement Structures." One of the challenges of changing ...
Loulizi, A, Flintsch, GW, Al-Qadi, IL & Mokarem, D 2006, Comparing resilient modulus and dynamic modulus of hot-mix asphalt as material properties for flexible pavement design. in Bituminous Paving Mixtures. 1970 edn, Transportation Research Record, no. 1970, National Research Council, pp. …
