Low temperature fracture resistance of cement emulsified asphalt mortar under mixed mode I/III loading

Najjar, Shima; Moghaddam, Abolfazl Mohammadzadeh; Sahaf, Ali; Aliha, M.R.M.

doi:10.1016/j.tafmec.2020.102800

Cited by 55 publications

(13 citation statements)

References 57 publications

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“…It can be concluded from the results of these tables that both methods provide nearly the same fracture toughness values for the investigated test samples under pure modes I and II. The calculated coefficient of variation (COV) values reported in these tables are less than 10%, which is a common diversity for test results of asphalt materials at low‐temperature conditions, as mentioned in other papers 13,16,57,70 . It is also worth mentioning that the real asphalt mixtures are heterogeneous and randomly distributed mixtures made of aggregates, mastic, and air voids.…”

Section: Resultsmentioning

confidence: 76%

“…This procedure is a reliable method to measure the fracture toughness for a material with different shapes and loading types. The SCB specimen is a well‐known fracture toughness test specimen mentioned in different standards and used by several researchers, 43,47–52 and the ENDB is a recently introduced specimen by Aliha et al, 53–55 which is increasingly used for fracture behavior studies of concrete materials 19,42,56–58 . Using the mentioned specimens, pure mode I and pure mode II fracture toughness is measured experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Hajiloo

Karimi

Aliha

et al. 2022

Fatigue Fract Eng Mat Struct

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The effect of some important testing conditions including test specimen (SCB and ENDB), fracture mode (I and II), loading rate (0.5, 1.0, and 5.0 mm/min), and temperature (−5°C, −15°C, and −25°C) is evaluated on fracture toughness of asphalt material containing different percentages of fibers (0%, 0.025%, 0.05%, and 0.1% of unit weight). The experimental and numerical results show that the addition of 0.025%, 0.05%, and 0.1% of the polyolefin–aramid fiber in asphalt mixture increases the fracture toughness of the control mixture by about 8%, 17%, and 23% in pure mode I and 7%, 16%, and 24% in pure mode II, respectively; which are among the most promising enhancements compared to other fibers. Results also reveal that fracture toughness at mode I obtained from the SCB and ENDB specimens is similar. However, the mode II fracture toughness obtained from the ENDB specimen is about 12% higher than the corresponding value obtained from the SCB specimen.

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Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Hajiloo

Karimi

Aliha

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Hence, several research works have focused on characterizing the mixed mode fracture behavior of asphalt mixtures from both experimental and theoretical aspects. Different test samples and testing methods such as SCB, center cracked Brazilian disc, edge notch disc bend, and four‐point bend specimens have been used in previous asphalt fracture toughness studies for conducting the mixed mode tensile‐shear fracture experiments 57–77 . On the other hand, some well‐known theories such as the maximum tangential stress or strain criteria and maximum tangential strain energy density were employed earlier for theoretical predictions of the experimental test results obtained from the asphalt mixtures at low temperature conditions 78–82 .…”

Section: Results and Disscussionmentioning

confidence: 99%

Heterogeneity effect on fracture parameters of a multilayer asphalt pavement structure containing a top‐down crack and subjected to moving traffic loading

Aliha

Ziari

Fard

et al. 2021

Fatigue Fract Eng Mat Struct

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A part of the multilayer pavement structure containing top‐down crack in the hot mix asphalt (HMA) layer and subjected to loading of a moving vehicle is simulated using the finite element method. Aggregate distribution and packing algorithm was used for modeling the HMA layer around the top‐down crack as a heterogeneous two‐phase (aggregate/fine aggregate matrix [FAM]) medium. By considering the heterogeneity aspects of the asphalt mixture, the influence of traffic loading location, aggregate distribution, crack length, thickness layer, and mechanical properties of layers and components were investigated on the fracture parameters. The results showed that for different locations of vehicle wheels relative to the top‐down crack, the magnitude and sign of the fracture parameters in heterogeneous modeling were significantly different from the similar values of the homogeneous simulation. The stress intensity factors and especially the T‐stress were significantly sensitive to the crack tip location that can be placed either inside the stiffer aggregate or the softer FAM part.

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“…(vi) Edge cracked disc specimen subjected to three-point bending (ENDB) [34][35][36][37][38][39][40][41][42];…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, all of the mentioned Fracture toughness (K Ic ) can be determined experimentally using suitable specimens and relevant test methods. Among the test configurations available for obtaining the K Ic value of asphalt mixtures, the following methods have received much attention by the researchers: (i) Edge cracked rectangular beam loaded with three-point or four-point bending [1,6,9,10,12]; (ii) Edge cracked circular compact tension specimen by pin loading (DCT) [1,2,13]; (iii) Edge cracked semi-circular specimen loaded with symmetric three-point bending (SCB) [4,6,7,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]; (iv) Center cracked Brazilian disc specimen loaded with diametral compression (BD) [30,31]; (v) Edge cracked disc specimen loaded with diametral compression (ENDC) [32,33]; (vi) Edge cracked disc specimen subjected to three-point bending (ENDB) [34][35][36][37][38][39][40][41][42];…”

Section: Introductionmentioning

confidence: 99%

Comparison of Testing Method Effects on Cracking Resistance of Asphalt Concrete Mixtures

2021

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As an inherent characteristic of materials, the fracture toughness is an important parameter to study the cracking behavior of asphalt concrete mixtures. Although material compositions and environmental conditions have a significant effect on the fracture toughness, for a certain material and testing environment, the test condition including the specimen configuration and loading type may also affect the obtained fracture toughness. In this paper, the effect of specimen configuration and applied loading type on the measured pure mode-I fracture toughness (KIc) is investigated. In order to achieve this purpose, using a typical asphalt mixture, four different test specimens including Semi-Circular Bend (SCB), Edge Notch Disc Bend (ENDB), Single Edge Notch Beam (SENB) and Edge Notch Diametral Compression (ENDC) disc are tested under pure mode I. The mentioned specimens have different shapes (i.e., full disc, semi-disc and rectangular beam) and are loaded either with symmetric three-point bending or diametral compressive force. The tests were performed at two low temperatures (−5 °C and −25 °C) and it was observed that the critical mode-I fracture toughness (KIc) was changed slightly (up to 10%) by changing the shape of the test specimen (i.e., disc and beam). This reveals that the fracture toughness is not significantly dependent on the shape of the test specimen. However, the type of applied loading has a significant influence on the determined mode I fracture toughness such that the fracture toughness determined by the disc shape specimen loaded by diametral compression (i.e., ENDC) is about 25% less than the KIc value with the same geometry but loaded with the three-point bending (i.e., ENDB) specimen. In addition, the fracture toughness values of all tested samples were increased linearly by decreasing the test temperature such that the fracture toughness ratio (KIc (@-25 °C)/KIc (@-5 °C)) was nearly constant for the ENDB, ENDC, SCB and SENB samples.

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Low temperature fracture resistance of cement emulsified asphalt mortar under mixed mode I/III loading

Cited by 55 publications

References 57 publications

Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Heterogeneity effect on fracture parameters of a multilayer asphalt pavement structure containing a top‐down crack and subjected to moving traffic loading

Comparison of Testing Method Effects on Cracking Resistance of Asphalt Concrete Mixtures

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