Mechanical and gamma-ray shielding performance of waste ceramic substituted magnetite concrete under high temperatures

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI:10.1016/j.conbuildmat.2026.145799

Kai Ji , Zhenfu Chen , Qiuwang Tao , Qiongfang Wu , Dan Wu , Minghui Wang

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引用次数: 0

Abstract

To synergistically enhance radiation shielding performance while promoting resource sustainability, this study developed a high-density radiation-shielding concrete by substituting magnetite fine aggregate with waste ceramic fine aggregate at volumetric replacement ratios of 0%, 20%, 40%, 60%, 80%, and 100%. The thermal response (25 ℃, 300 ℃, 450 ℃, 600 ℃) was systematically evaluated in terms of mass loss ratio, ultrasonic pulse velocity（UPV）, macro-mechanical properties, microstructural evolution, and gamma-ray linear attenuation coefficient (μ) characteristics. Multi-scale mechanisms were elucidated via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results demonstrate that moderate ceramic incorporation optimizes internal humidity distribution and reinforces the interfacial transition zone (ITZ). The 60% replacement mixture exhibited optimal comprehensive performance within 300–450 ℃, with significantly higher compressive strength, splitting tensile strength, and UPV than the control (0% replacement), indicating superior thermo-mechanical stability. Even under extreme 600 ℃ exposure, although compressive strength slightly decreased, splitting tensile strength remained higher than that of the control. SEM analysis revealed reduced ITZ porosity and enhanced densification in the 60% mixture; at 300 ℃, secondary hydration, triggered by internal curing, generated C-S-H gel that effectively filled and “healed” thermally induced microcracks. Gamma-ray shielding performance was evaluated using the μ and the mass attenuation coefficient (μₘ). At different temperatures, as the replacement ratio increased, μ showed a decreasing trend, whereas μₘ showed an increasing trend. In conclusion, the 60% waste ceramic replacement ratio achieves synergistic optimization among load-bearing capacity, thermal-damage tolerance, and radiation-shielding efficiency, offering a green functional material with environmental compatibility and high-temperature service reliability for nuclear facilities, civil defense projects, and medical radiation shielding structures.

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废陶瓷代替磁铁矿混凝土高温下的力学和γ射线屏蔽性能

为了协同提高辐射屏蔽性能，同时促进资源可持续性，本研究以废陶瓷细骨料代替磁铁矿细骨料，按体积替代率分别为0%、20%、40%、60%、80%和100%，研制了高密度辐射屏蔽混凝土。从质量损失率、超声脉冲速度（UPV）、宏观力学性能、微观组织演化和γ射线线性衰减系数（μ）特征等方面对热响应（25℃、300℃、450℃、600℃）进行了系统评价。通过扫描电镜（SEM）和x射线衍射（XRD）分析了多尺度机理。结果表明，适量的陶瓷掺入优化了内部湿度分布，强化了界面过渡区（ITZ）。在300 ~ 450℃范围内，60%置换后的混合料综合性能最佳，抗压强度、劈裂抗拉强度和UPV均显著高于0%置换后的混合料，表现出优异的热机械稳定性。即使在600℃极端暴露下，抗压强度略有下降，但劈裂抗拉强度仍高于对照。SEM分析表明，在60%的混合物中，ITZ孔隙率降低，致密化增强；在300℃下，内部固化引发二次水化，生成C-S-H凝胶，有效填充和“愈合”热致微裂缝。用μ和质量衰减系数（μ￣）评价了屏蔽γ射线的性能。在不同温度下，随着替代率的增加，μ呈减小趋势，而μ _ _ _呈增大趋势。综上所述，60%的废陶瓷替代率实现了承载能力、热损伤容差和辐射屏蔽效率的协同优化，为核设施、民防工程、医疗辐射屏蔽结构提供了一种具有环境相容性和高温服务可靠性的绿色功能材料。

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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.