Scholarlink

<p>Pumice-based structural lightweight concrete presents a sustainable alternative to conventional concrete, particularly in applications where reduced dead load and improved thermal insulation are critical, such as underground and fire-prone infrastructure. The critical role of pore structure for these applications was investigated in this study. Pumice-based lightweight concrete (LWC) samples were subjected to uniaxial compression before and after exposure to elevated temperatures to assess changes in mechanical response. The size, spatial distribution and connectivity of pores and aggregate geometry was acquired by X-ray computed tomography (XCT). Four different discrete element numerical schemes of augmenting complexity were implemented in PFC3D, one of which includes the XCT-informed porous structure. The pre-fire mechanical response was evaluated and then, response to fire damage was reproduced based on a methodology of stiffness reduction. The XCT-derived specimen fabric was most successful in reproducing the experimentally observed localised failure. This research lays new groundwork for the modelling of fire-affected behaviour and more accurate, XCT-informed simulation strategies for porous construction materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanical response of porous aggregates pre and post fire-related degradation: a multi-scale evaluation via X-ray computed tomography and discrete element modelling

  • 期刊论文

  • 发表日期：

    2026年1月10日

查看全文
  • Paraskevi Yiouta-Mitra,
  • Zeynep Karatza,
  • Pavlos Nomikos,
  • Efstratios Badogiannis

摘要

Pumice-based structural lightweight concrete presents a sustainable alternative to conventional concrete, particularly in applications where reduced dead load and improved thermal insulation are critical, such as underground and fire-prone infrastructure. The critical role of pore structure for these applications was investigated in this study. Pumice-based lightweight concrete (LWC) samples were subjected to uniaxial compression before and after exposure to elevated temperatures to assess changes in mechanical response. The size, spatial distribution and connectivity of pores and aggregate geometry was acquired by X-ray computed tomography (XCT). Four different discrete element numerical schemes of augmenting complexity were implemented in PFC3D, one of which includes the XCT-informed porous structure. The pre-fire mechanical response was evaluated and then, response to fire damage was reproduced based on a methodology of stiffness reduction. The XCT-derived specimen fabric was most successful in reproducing the experimentally observed localised failure. This research lays new groundwork for the modelling of fire-affected behaviour and more accurate, XCT-informed simulation strategies for porous construction materials.