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<p>To reduce traditional lightweight aggregate concrete (LWAC) reliance on shale ceramsite (SC) and natural sand (NS), and expand the utilization of recycled foamed basalt solid waste, LWAC was prepared by replacing SC and NS with recycled foamed basalt coarse and fine aggregates (RFBCA and RFBFA) at varying proportions (0%, 50%, and 100%). The application potential of the Material was evaluated via physical, mechanical, and durability tests, supplemented by microstructural characterization. The results show that 100% RFBCA and 50% RFBFA increase the 28-day compressive strength to 14.3&#xa0;MPa, representing a 52% improvement. The utilization of 100% RFBCA reduces the shrinkage strain by 61.1%, while the adoption of 100% RFBFA enables the thermal conductivity of concrete slabs to be controlled at 0.102&#xa0;W/(m·K). In addition, complete replacement with recycled foamed basalt aggregate (RFBA) reduces the economic cost of LWAC by 11%. Conversely, the addition of RFBA progressively impairs the frost resistance of LWAC by up to 16% and workability by up to 89%. With lower internal connected porosity and more compact interfacial bonding with the cement matrix, RFBA can reduce building energy consumption and structural self-weight while enhancing the utilization rate of solid waste resources in manufacturing lightweight partition boards and thermal insulation blocks.</p>

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Impact of High-Water-Absorption Recycled Foamed Basalt on Lightweight Aggregate Concrete Performance

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Feiyang Zhang,
  • Fengli Liu,
  • Rubo Shi,
  • Kefei Shi,
  • Xiaohui Liu,
  • Xue Yang,
  • Liu Yang,
  • He Meng,
  • Yang Gao,
  • Jinguang Huang

摘要

To reduce traditional lightweight aggregate concrete (LWAC) reliance on shale ceramsite (SC) and natural sand (NS), and expand the utilization of recycled foamed basalt solid waste, LWAC was prepared by replacing SC and NS with recycled foamed basalt coarse and fine aggregates (RFBCA and RFBFA) at varying proportions (0%, 50%, and 100%). The application potential of the Material was evaluated via physical, mechanical, and durability tests, supplemented by microstructural characterization. The results show that 100% RFBCA and 50% RFBFA increase the 28-day compressive strength to 14.3 MPa, representing a 52% improvement. The utilization of 100% RFBCA reduces the shrinkage strain by 61.1%, while the adoption of 100% RFBFA enables the thermal conductivity of concrete slabs to be controlled at 0.102 W/(m·K). In addition, complete replacement with recycled foamed basalt aggregate (RFBA) reduces the economic cost of LWAC by 11%. Conversely, the addition of RFBA progressively impairs the frost resistance of LWAC by up to 16% and workability by up to 89%. With lower internal connected porosity and more compact interfacial bonding with the cement matrix, RFBA can reduce building energy consumption and structural self-weight while enhancing the utilization rate of solid waste resources in manufacturing lightweight partition boards and thermal insulation blocks.