Exploring the roles of cenosphere waste in lightweight high-toughness cement-based composites under elevated temperatures: A comprehensive macro to micro analysis

IF 7.4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-10-01 DOI:10.1016/j.jobe.2025.114271

Wenhua Chen , Qiang Wang , Zhanfeng Qi , Feng Yu

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引用次数: 0

Abstract

Cement-based composites are prone to strength loss and cracking at high temperatures, compromising structural safety. Existing measures such as low water-cement ratios or fiber addition provide limited fire resistance, and the potential of waste derived lightweight aggregates is insufficiently understood. This study evaluates the effectiveness of cenosphere waste in improving the thermal resistance of lightweight high-toughness cement-based composites (LHTCC). LHTCC with varying cenosphere contents was exposed to 20–1000 °C and tested for physical, mechanical, and micro-structural properties using differential thermal analysis, differential scanning calorimetry, mercury intrusion porosimetry, and scanning electron microscopy. Cenosphere addition reduced cracking, mass loss, and strength degradation. Specimens with 20 % cenosphere retained 19.72 MPa compressive strength at 1000 °C, outperforming the control. Enhanced performance was attributed to increased closed porosity, fiber-melting pores relieving vapor pressure, and secondary hydration reducing Ca(OH)₂ and CaCO₃ decomposition. Cenosphere waste offers a sustainable and effective approach to enhance the fire resistance and durability of LHTCC, providing a promising solution for safer concrete structures.

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探索高温下轻质高韧性水泥基复合材料中空心球废弃物的作用：宏观到微观的综合分析

水泥基复合材料在高温下容易发生强度损失和开裂，影响结构安全。现有的措施，如低水灰比或添加纤维，提供有限的耐火性能，废物产生的轻质骨料的潜力还没有充分了解。本研究评估了空心球废弃物在改善轻质高韧性水泥基复合材料（LHTCC）耐热性方面的有效性。将不同空心球含量的LHTCC暴露于20-1000°C，并使用差热分析、差扫描量热法、压汞孔隙法和扫描电子显微镜测试其物理、机械和微观结构性能。空心球的加入减少了开裂、质量损失和强度退化。含20%空心球的试样在1000℃时仍保持19.72 MPa的抗压强度，优于对照组。增强的性能归因于增加的闭合孔隙率，纤维熔融孔隙减轻蒸汽压力，二次水化减少了Ca(OH)2和CaCO3的分解。空心球废弃物提供了一种可持续和有效的方法来提高轻质混凝土的耐火性和耐久性，为更安全的混凝土结构提供了一个有希望的解决方案。

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.