Fracture Characteristics of Asphalt Mixtures Containing Incinerator Bottom Ash Aggregate

Abstract

The documented results form part of a larger research program to study the mechanical and environmental properties of asphaltic mixtures containing incinerator bottom ash aggregate (IBAA). The fracture characteristics of four mixtures containing 0%, 30%, 60%, and 80% IBAA by weight were investigated under monotonic and cyclic semi-circular bending conditions. The linear elastic fracture mechanics (LEFM) approach was used to evaluate crack resistance of the tested mixtures with the aim of investigating the effect of IBAA content on these properties. LEFM led to the determination of the stress intensity factor, the J-integral, fracture energy, and Paris law parameters. Crack propagation was monitored with a digital camera, and a program developed in-house was adopted in interpreting crack growth. In addition, a new approach was presented to obtain asphalt fatigue damage parameters from fracture tests. Results showed a benefit to be gained in adding IBAA up to a certain amount, beyond which cracking properties become close to those of the control mix.

Physical and Chemical Properties, Pretreatment, and Recycling of Municipal Solid Waste Incineration Fly Ash and Bottom Ash for Highway Engineering: A Literature Review

“…Compared with coarse aggregate, bottom ash is more likely to replace fine aggregate. When the bottom ash is used as aggregate, the elastic modulus and tensile strength of asphalt mixture can be improved [176,177]. When MSWI bottom ash is added as filling material, the elastic modulus, tensile strength, and fracture performance of asphalt mixture can be improved reliably [42,[178][179][180][181].…”

Investigating the effects of loading, mechanical properties and layers geometry on fatigue life of asphalt pavements

“…It worth mentioning for plotting Figure , Paris law coefficients (A and n) were assumed to be constant by changing the stiffness modulus of asphalt layer as suggested by some research papers . However Kuai et al and Hassan et al Showed that Paris law coefficients may depend on temperature, and asphalt mixture's ingredient properties . These parameters can influence the fatigue life of the pavement.…”

“…6,8 However Kuai et al and Hassan et al Showed that Paris law coefficients may depend on temperature, and asphalt mixture's ingredient properties. 10,15 These parameters can influence the fatigue life of the pavement. Accordingly, some extra analyses were done to figure out the influence of Paris coefficients on the fatigue life of the investigated pavement.…”

“…In addition, they investigated the aging effects on fracture properties of asphalt mixtures and stated that n is a good indicator for assessing the resistace of asphalt mixtures against cracking. Hassan and Khalid applied Paris law using both J‐integral and stress intensity factor‐based methods on asphalt mixtures containing various contents of incinerator bottom ash aggregate and showed that both methods are able to properly describe crack growth in asphalt mixtures. Kuai et al carried out a test on asphalt mixtures and found that J‐integral method is independent of stress level and loading frequency, while the conventional Paris law that is based on the stress intensity factors depends on loading frequency.…”

Fracture toughness prediction using Weibull statistical method for asphalt mixtures containing different air void contents

“…2 Further propagation of such cracks may occur because of tensile thermal stresses induced by temperature fluctuation which can result in pure mode I fracture mechanism in the asphalt pavement. Different test specimens such as the single edge notched three-point bend beam (SENB), [9][10][11][12][13][14][15] rectangular beam subjected to four-point bend loading, 16,17 disc shape compact tension (DCT), [18][19][20] centre cracked diametraly compressed Brazilian disc, [21][22][23] wedge splitting specimen, 24 edge notched disc bend specimen (ENDB) [25][26][27] and also semi-circular bend (SCB) 3,5,6, [28][29][30][31][32][33][34][35] have been used in the past for determining the fracture properties in a wide range of asphalt concrete materials including hot mix asphalt (HMA), warm mix asphalt (WMA) and other types of cement or polymer concretes. [3][4][5][6] In recent years, numerous papers have been published for studying the low temperature cracking behaviour of asphalt materials and determining the fracture toughness of asphalt concretes using either experimental, theoretical or modelling methods.…”