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

2021 ◽  
Vol 11 (11) ◽  
pp. 5094
Author(s):  
Dayong Yang ◽  
Hamid Reza Karimi ◽  
Mohammad Reza Mohammad Aliha
Keyword(s):  
Fracture Toughness ◽  
Asphalt Concrete ◽  
Mode I ◽  
Pure Mode ◽  
Mode I Fracture ◽  
Three Point Bending ◽  
Mode I Fracture Toughness ◽  
Applied Loading ◽  
Concrete Mixtures ◽  
Edge Notch

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.

Pure Mode I Fracture Toughness Determination in Rocks Using a Pseudo-Compact Tension (pCT) Test Approach

2020 ◽  
Vol 53 (7) ◽  
pp. 3267-3285
Author(s):  
Andrea Muñoz-Ibáñez ◽  
Jordi Delgado-Martín ◽  
Miguel Costas ◽  
Juan Rabuñal-Dopico ◽  
Jose Alvarellos-Iglesias ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Compact Tension ◽  
Mode I ◽  
Pure Mode ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness

scholarly journals Multi-parametric characterization of mode I fracture toughness of asphalt concrete: Influence of void and RA contents, binder and aggregate types

2018 ◽  
Vol 11 (3) ◽  
pp. 274-284 ◽  
Author(s):  
Saannibe Ciryle Somé ◽  
Montassar Abdhelack Fredj ◽  
Mai-Lan Nguyen ◽  
Arnaud Feeser ◽  
Alexandre Pavoine
Keyword(s):  
Fracture Toughness ◽  
Asphalt Concrete ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness

Mode I and Mode II Fracture Toughness Testing for a Coarse Grain Marble

2006 ◽  
Vol 5-6 ◽  
pp. 181-188 ◽  
Author(s):  
M.R.M. Aliha ◽  
R. Ashtari ◽  
Majid R. Ayatollahi
Keyword(s):  
Fracture Toughness ◽  
Coarse Grain ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Mode I Fracture ◽  
Mode Ii Fracture ◽  
Mode I Fracture Toughness ◽  
Mode Ii Fracture Toughness ◽  
T Stress

A series of fracture toughness tests have been conducted on a type of coarse grain marble. The tests were carried out either in pure mode I or in pure mode II conditions by using the cracked chevron notched Brazilian disc (CCNBD) specimen. A total number of 44 CCNBD specimens were tested, half in pure mode I and the rest in pure mode II, to obtain reliable values for mode I and mode II fracture toughness (KIc and KIIc) of the tested marble. The average value of KIc for this marble was approximately about 1.12 MPa m showing a good agreement with those reported for similar coarse grain marbles. The mode II fracture toughness was found to be 2.25 MPa m in average which is approximately twice the mode I fracture toughness. However, the conventional fracture criteria suggest that the mode I fracture toughness should be higher than the mode II fracture toughness, (KIc>KIIc). According to these criteria, the ratio of KIIc / KIc is a figure typically between 0.63 and 0.96. It is shown in this paper that enhanced mode II fracture toughness of CCNBD specimen could be due to the effects of highly negative T-stress when the specimen is subjected to mode II. It is also shown that an improved prediction for the ratio KIIc / KIc can be achieved when the effect of T-stress is taken into account.

scholarly journals Effect of Testing Method Type and Specimen Size on Mode I Fracture Toughness of Kimachi Sandstone

2019 ◽  
Vol 135 (5) ◽  
pp. 33-41 ◽  
Author(s):  
Minami KATAOKA ◽  
Yuzo OBARA ◽  
Leona VAVRO ◽  
Kamil SOUCEK ◽  
Sang-Ho CHO ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Specimen Size ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Testing Method

scholarly journals The effect of modified tannic acid (TA) eco-epoxy adhesives on mode I fracture toughness of bonded joints

2021 ◽  
Vol 96 ◽  
pp. 107122
Author(s):  
Mohamed Nasr Saleh ◽  
Nataša Z. Tomić ◽  
Aleksandar Marinković ◽  
Sofia Teixeira de Freitas
Keyword(s):  
Fracture Toughness ◽  
Tannic Acid ◽  
Mode I ◽  
Bonded Joints ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Epoxy Adhesives
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