Top-down cracking (TDC) is recognized as one of the major distress modes in asphalt pavements. This study aimed to determine fracture parameter J-integral TDC, which a critical input predict crack growth rate and fatigue life pavements for this type distress. Previous research studies demonstrated that TDC affected by various factors, including complex state high tensile or shear stresses induced loading at edge within tire material properties such modulus gradient layer, moduli base...

Cracking has become a primary mode of distress in recent years that frequently drives the need for rehabilitation asphalt pavements. Meanwhile, mix designs are becoming more and complex with increasing uses recycled materials, recycling agents, binder additives/modifiers, multiple warm technologies. Thus, there is an urgent to identify reliable cracking tests can be used routine design eliminate brittle mixes. This paper critically reviewed mechanisms laboratory tests. A total 12 were...

The deployment of automated vehicles (AVs) has many potential benefits, such as reductions in congestion and emissions, safety improvements. However, two notable aspects AVs are their impact on roadway hydroplaning pavement life. Since most programmed to follow a set path maintain lateral position the center lane, over time, significant rutting will occur asphalt surfaced pavements. This study measured AV wandering patterns compared them with human driven vehicles. Both could be modeled...

It is well known that fatigue cracking not just a material problem; it also correlates highly with pavement structure and environmental traffic conditions. This unique characteristic highlights the importance of simple performance test (SPT) can be used for daily hot-mix asphalt (HMA) mixture design predicting cracking. paper investigates use Texas Transportation Institute's overlay tester (OT) as an SPT Fatigue occurs in two stages: crack initiation propagation. However, noted this paper,...

The purpose of this paper is to present a new mechanistic-empirical (M-E) rutting model developed for hot-mix asphalt (HMA) overlay thickness design and analysis. After reviewing existing models in the literature, it was found that well-known VESYS layer still rational choice adopted with minor modification HMA development. main feature proposed M-E characterize specific permanent deformation properties rather than global parameters used Mechanistic-Empirical Pavement Design Guide. For each...

Abstract Cyanate ester (CE) resin was modified with renewable resource, i.e. epoxidized soybean oil (ESO), and the effects of ESO content on curing co‐reaction, morphologies, water absorption behaviors, thermal mechanical properties CE/ESO blends were studied. Differential scanning calorimeter (DSC), Fourier transform infrared spectroscopy (FTIR), electron microscopy (SEM), dynamic analysis (DMA) employed to characterize ESO‐modified CE polymer networks. Homogeneous structures observed for...

Under the same applied traffic loading, time is traditionally assumed to be a function of only vehicle speed and depth beneath pavement surface. Additionally, no definite loading waveform has been established and/or recommended for any one special situation. After numerous computations analyses in this study, it was found that not surface but also moduli ratio between layer interest immediate succeeding below. Furthermore, changed with ratio. Based on results new equations more accurately...

The purpose of this paper is to present a new mechanistic-empirical (ME) reflective cracking model developed for hot-mix asphalt (HMA) overlay thickness design and analysis. After reviewing existing models, the based on Paris' law fracture mechanics was considered as state practice selected basis ME development in study. consists stress intensity factor properties (A n) fundamental input parameters modeling crack propagation caused by both traffic loadings (bending shearing) thermal effects...

An asphalt overlay is one of the primary options for rehabilitating existing and concrete pavements. Reflection cracking, however, has been a serious concern associated with overlays long time. Currently, reflection cracking not considered in most thickness design programs, including Mechanistic–Empirical Pavement Design Guide developed under NCHRP Project 1-37A. Therefore, there an urgent need to develop cracking–based analysis tool routine use. Three mechanisms (bending, shearing, thermal...

Abstract Crack sealing is a practice used for routine and preventive maintenance as part of pavement’s preservation strategy. However, crack sealant failures are common in Texas, particularly within the first 3 years application (or service life). The major causes can be classified under two categories: Adhesion failure cohesion failure. Although both lead to significant reduction life pavement structure, adhesive most cases dominant type. Several laboratory tests such rotational viscosity,...

The fundamental mechanisms leading to the development of reflective cracking are differential movements from supporting pavement structure. In this study, deflection profiles collected using rolling dynamic deflectometer (RDD) were used determine threshold values for cracking. This provides a quantitative method severity cracks (or joints), which controls potential Three different parameters considered: (i) sensor 1 (W1), (ii) between and 3 (W1-W3), (iii) multiple baseline value. reliability...

Abstract Poly(ether sulfone) terminated with phenolic hydroxyl groups modified cyanate ester resin and epoxy cocuring blends were investigated by differential scanning calorimetry, Fourier transform infrared spectroscopy, electron microscopy, rheometry, mechanical properties measurement. The results suggested that poly (ether (PES) could accelerate the polycyclotrimerization reaction of processes between because presence at end PES molecules. It was found evolution morphologies complex...