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<p>Assessing the degree of granite weathering is essential for evaluating slope stability and ensuring the long-term performance of civil infrastructure in tropical environments. This study presents an integrated colorimetric and mechanical framework for quantifying granitic rock weathering by combining CIELAB color analysis with digital image processing and geomechanical testing. Field investigations were conducted at Kuad Quarry, Penang, Malaysia, where 128 in-situ color measurements (<i>L*, a*, b*</i>) were collected across six quarry slopes and incorporated into slope-scale image analysis framework for rock weathering classification. The colorimetric results show a strong linear relationship between the <i>a*</i> and <i>b*</i> parameters (R<sup>2</sup> = 0.899), indicating consistent chromatic trends associated with progressive surface weathering. Image-based classification reveals that more than 70% of the investigated slope surfaces are characterized by low weathering grades (Grades I–II), while highly weathered conditions (Grades V–VI) account for less than 6% of the total area. Independent validation using Schmidt hammer, point load test, ultrasonic pulse velocity (UPV) and laboratory-UCS testing demonstrates that variations in surface color parameters are systematically associated with changes in rock strength. The proposed non-destructive approach enables efficient, slope-scale weathering assessment and provides practical support for rock mass characterization and slope monitoring. By facilitating early identification of weathering-related degradation, the framework contributes to improved slope management strategies and supports the development of climate-resilient infrastructure in regions subject to intense tropical weathering.</p>

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Quantitative Assessment of Tropical Granitic Weathering Through CIELAB Color Space and Digital Image Analysis

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Fatin Nadhirah Ahmad Pauzi,
  • Mazlina Razali,
  • Mohd Ashraf Mohamad Ismail,
  • Hayato Tobe,
  • Kensuke Date,
  • Yasuhiro Yokota,
  • Nirandoal Cheng

摘要

Assessing the degree of granite weathering is essential for evaluating slope stability and ensuring the long-term performance of civil infrastructure in tropical environments. This study presents an integrated colorimetric and mechanical framework for quantifying granitic rock weathering by combining CIELAB color analysis with digital image processing and geomechanical testing. Field investigations were conducted at Kuad Quarry, Penang, Malaysia, where 128 in-situ color measurements (L*, a*, b*) were collected across six quarry slopes and incorporated into slope-scale image analysis framework for rock weathering classification. The colorimetric results show a strong linear relationship between the a* and b* parameters (R2 = 0.899), indicating consistent chromatic trends associated with progressive surface weathering. Image-based classification reveals that more than 70% of the investigated slope surfaces are characterized by low weathering grades (Grades I–II), while highly weathered conditions (Grades V–VI) account for less than 6% of the total area. Independent validation using Schmidt hammer, point load test, ultrasonic pulse velocity (UPV) and laboratory-UCS testing demonstrates that variations in surface color parameters are systematically associated with changes in rock strength. The proposed non-destructive approach enables efficient, slope-scale weathering assessment and provides practical support for rock mass characterization and slope monitoring. By facilitating early identification of weathering-related degradation, the framework contributes to improved slope management strategies and supports the development of climate-resilient infrastructure in regions subject to intense tropical weathering.