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Shear behavior of crushed mudstone and claystone under macrostructural and microstructural approaches


Nahazanan, Haslinda and Rosley, Ili Syazwani and Md Yusoff, Zainuddin (2019) Shear behavior of crushed mudstone and claystone under macrostructural and microstructural approaches. Journal of Testing and Evaluation, 49 (3). pp. 2017-2027. ISSN 0090-3973


This article discussed the shear behavior of crushed mudstone and claystone in Malaysia when subjected to short- and long-term immersion while staged compression-immersion-direct shear tests were performed. The crushed mudrocks were subjected to 5 stages of loading (50 kPa, 100 kPa, 150 kPa, 300 kPa, and 600 kPa) with and without immersion, whereby immersions were done at 100 kPa and 600 kPa vertical loads were referred to as long- and short-term immersion tests, respectively. A variable pressure scanning electron microscope (VPSEM) and X-ray diffraction (XRD) were employed for microstructural investigation so as to give a microstructural description of crushed mudrock failure upon shearing. It is found that short-term immersion had caused the crushed mudrocks to be less brittle while long-term immersion resulted in fully plastic straining behavior for both crushed mudrocks. XRD results revealed that claystone contained higher swelling minerals compared to mudstone, which explains the clod-form of claystone seen in VPSEM images. Based on both macrostructural and microstructural investigation, it is found that the crushed mudrocks are more susceptible to failure under short-term immersion, while long-term immersion caused the crushed mudrocks to achieve a stable state and be less sensitive to further moisture changes.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1520/JTE20180486
Publisher: ASTM International
Keywords: Shear behavior; Mudstone; Claystone
Depositing User: Mr. Sazali Mohamad
Date Deposited: 08 Sep 2021 10:53
Last Modified: 08 Sep 2021 10:53
Altmetrics: http://www.altmetrics.com/details.php?domain=pasir.upm.edu.my&doi=10.1520/JTE20180486
URI: http://psasir.upm.edu.my/id/eprint/82106
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