Influences of elevated temperature and re-curing on the compressive performance of lightweight concrete containing metakaolin: Experiments and prediction models

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-06-11 DOI:10.1016/j.conbuildmat.2025.142111

Seyedrasoul Nabavian , Mohammad Asghari Shirvani , Aliakbar Gholampour

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引用次数: 0

Abstract

The influence of elevated temperatures on the compressive behavior of lightweight concrete (LWC) has become a topic of interest due to the importance of safety assessment, fire-resistant design, and repair of structures affected by fire. However, there has been a lack of research about the water re-curing of thermally compromised concrete. Therefore, the current study aims to investigate the impact of elevated temperatures and water re-curing on the compressive performance of LWC with different proportions of metakaolin (0, 5, 10, 15, and 20 %). The LWCs were heated at temperatures of 300 and 600 °C, followed by the application of water re-curing process. Then, further degradation and recovery of the LWCs were examined. The LWC performance was explored through calculating the axial stress-strain response and mechanical parameters such as toughness, modulus of elasticity and compressive strength. Fracture mode and visual observations were also studied. The results indicate that there is a remarkable decline in the mechanical features of the LWCs by increasing temperature. At 600 °C, the most significant deterioration is observed with average reductions of 24 %, 65 % and 39 % in toughness, modulus of elasticity and compressive strength, respectively. The LWC with metakaolin exhibits superior behavior at high temperatures compared to the LWC without metakaolin. The water re-curing improves the mechanical performance of the LWCs. The recovery of strength, toughness and modulus of elasticity for the LWCs at the investigated temperatures are 11–26 %, 8–28 %, and 4–50 %, respectively. Besides, models are presented to forecast the mechanical features of the LWCs with metakaolin under elevated temperatures. The predicted outcomes display appropriate accuracy compared to the present experimental results and those of other researchers. Ultimately, response surface method is employed to identify the optimum design parameters.

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高温和再养护对偏高岭土轻质混凝土抗压性能的影响：试验与预测模型

高温对轻质混凝土（LWC）抗压性能的影响已成为人们感兴趣的话题，这是由于安全评估、耐火设计和受火灾影响的结构修复的重要性。然而，关于热损伤混凝土水再养护的研究一直缺乏。因此，本研究旨在研究高温和水再养护对不同偏高岭土比例（0、5、10、15和20 %）的LWC抗压性能的影响。在300°C和600°C的温度下加热lwc，然后采用水再固化工艺。然后，研究了lwc的进一步降解和回收。通过计算轴向应力-应变响应和韧性、弹性模量、抗压强度等力学参数，探讨了LWC的性能。断裂模式和目视观察也进行了研究。结果表明，随着温度的升高，lwc的力学特性有明显的下降。在600℃时，观察到最显著的变质，韧性、弹性模量和抗压强度分别平均降低24% %、65% %和39% %。与不含偏高岭土的LWC相比，含偏高岭土的LWC在高温下表现出更好的性能。水再养护改善了轻质混凝土的力学性能。在实验温度下，lwc的强度、韧性和弹性模量的恢复分别为11-26 %、8-28 %和4-50 %。此外，还建立了高温下偏高岭土轻质混凝土的力学特性预测模型。与目前的实验结果和其他研究人员的结果相比，预测结果显示出适当的准确性。最后利用响应面法确定了最优设计参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.