Mode I Fracture Behaviors between Cement Concrete and Asphalt Concrete Layer

Abstract

Asphalt overlay or concrete overlay on existing pavements is a common strategy for pavement maintenance. Interlayer bonding performance between asphalt and concrete layers is a critical concern in achieving optimal long-term structural performance due to the possible cracking along the interface. In this study, bonding behaviors of asphalt concrete interface were characterized by employing mode I fracture tests conducted at −10 and 25°C, respectively. Two typical interface conditions were manually prepared. A tack coat material was applied on the interface with four distinct rates: 0.1, 0.2, 0.3, and 0.4 L/m2. Parameters including fracture strength, stress intensity factor (KIC), facture energy (GF), and energy release rate (J integral) were selected to evaluate the fracture performance. Results showed that optimum tack coat rates were 0.1 and 0.3 L/m2 for specimens with unmilled and milled surfaces. At the optimum tack coat rates, KIC and GF increased with the increase of interface roughness at −10°C, while, at 25°C, J integral of specimens with unmilled interface was larger than that of specimens with milled interface at the optimum tack coat rates. Analysis of variance (ANOVA) was conducted to evaluate the significance of the factors on the fracture loads and found that surface roughness is significant at −10°C and becomes nonsignificant at 25°C. Temperature and tack coat rate were significant factors considering a given interface.

A Novel MBAS-RF Approach to Predict Mechanical Properties of Geopolymer-Based Compositions

“…The cement production process, due to the use of limestone as the main raw material, will emit a large amount of CO 2 into the air, as well as harmful gases and dust, such as SO 2 and NO X , which aggravate the greenhouse effect and cause environmental pollution. [ 5 , 6 , 7 ]. In addition, the preparation of cement needs the support of electric power resources, which mainly take coal as the basic fuel, and the combustion of coal is accompanied by the production of industrial waste, such as fly ash and slag, which will not only affect the ecological environment, but also occupy a large number of land resources [ 8 , 9 , 10 , 11 ].…”

Multiple Reflective Cracks in Semirigid Base Asphalt Pavement under Traffic Load Using XFEM

“…In recent years, scholars have conducted in-depth research on the generation, expansion, and suppression mechanism of re ective cracks by using the boundary element method [2], meshless method [3], and nite element [4]. Due to the maturity, economy, and reliability of solving complex problems of nite element software, the nite element method is widely used in solving complex dynamic response problems of pavement structures under moving wheel loads.…”

The dynamic responses of an infinite plate resting on a poroelastic layered half‐space soil medium with imperfect interface to a moving load

“…On the other hand, it is of primary importance to formulate imperfect interface conditions mathematically to measure the effect of the imperfect interface on the whole structure. Researchers have created several contact models for mechanical analysis to study the effect of interlayer connection on the road response: stickiness Knot coefficient model [18,19], friction coefficient model [20], compliance coefficient [21], and interlayer shear strength model [22][23][24][25], etc. Moreover, Piotr Jaskula [26] analyzed and calculated the premature failure of the newly built and rebuilt pavement structure, and found that the poor interlayer contact conditions between the structural layers have a greater impact on the calculated fatigue life of the pavement.…”