页岩陶粒内养护对超高性能混凝土力学性能与微观结构的调控机制
Mechanism of internal curing of shale ceramsite on the mechanical properties and microstructure of ultra-high performance concrete
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摘要: 超高性能混凝土(UHPC)兼具卓越的强度与耐久性,但其自重大、难以实现轻量化,始终限制其在结构减荷与长跨工程中的应用。为在保证力学性能的同时实现减重并优化界面结构,将页岩陶粒引入UHPC体系,系统研究了不同养护条件与预湿程度下陶粒内养护对UHPC力学性能与微观结构的作用机制。结果表明,陶粒掺量与拌合物流动度及表观密度呈显著负相关性;页岩陶粒的内养护效应可促进胶凝相更充分水化并提高基体致密度,在30%掺量且预湿吸水率为4%时,抗压强度较基准组提升9.75%;在蒸汽养护条件下,抗压强度相较未掺陶粒组最高提高26.2%,抗折强度变化幅度较小,弯曲韧性则实现大幅增强。微观分析显示,预湿陶粒在硬化过程中持续释水,显著促进钙铝硅水化物(C-(A)-S-H)凝胶生成并细化分布,界面过渡区(ITZ)宽度明显收缩,钙硅比(Ca/Si)空间梯度减缓,界面裂缝贯通受到抑制,基体与骨料间结合致密度显著提高。上述结果揭示了陶粒特性与养护制度对UHPC性能的协同调控机制,为轻量化UHPC的定制化设计与工程应用提供了可靠的理论依据和参数优化策略。Abstract: Ultra-high performance concrete (UHPC) combines outstanding strength and durability; however, its heavy weight and the difficulty of achieving lightweight designs consistently limit its application in structural load reduction and long-span projects. In order to ensure mechanical performance while achieving weight reduction and optimizing the interface structure, this paper introduces shale ceramsite into the UHPC system and systematically studies the mechanisms of internal curing of ceramsite under different curing conditions and pre-wetting levels on the mechanical properties and microstructure of UHPC. The results indicate a significant negative correlation between the content of ceramsite and the fluidity and apparent density of the mix. The internal curing effect of shale ceramsite can enhance the hydration of the cementitious phase and increase the density of the matrix; with a ceramsite content of 30% and a pre-wet water absorption rate of 4%, the compressive strength improves by 9.75% compared to the control group. Under steam curing conditions, the compressive strength increases by up to 26.2% compared to the group without ceramsite, while the change in flexural strength is relatively minor, yet the bending toughness is significantly enhanced. Microstructural analysis shows that pre-wet ceramsite continuously releases water during the curing process, significantly promoting the generation and refinement of C-(A)-S-H gel, noticeably reducing the width of the interfacial transition zone (ITZ), slowing the spatial gradient of the Ca/Si ratio, suppressing the penetration of interfacial cracks, and significantly improving the bonding density between the matrix and aggregates. These findings reveal the synergistic regulation mechanism of ceramsite characteristics and curing systems on UHPC performance, providing a reliable theoretical basis and parameter optimization strategies for the customized design and engineering application of lightweight UHPC.
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