离心加速度对水泥基材料力学性能的影响研究
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1.河海大学力学与工程科学学院;2.河海大学土木与交通学院;3.南京水利科学研究院岩土工程研究所

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on the Effect of Centrifugal Acceleration on the Mechanical Properties of Cement-Based Materials
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    现有研究已从混凝土材料配比、养护时间等方面揭示了其性能变化规律,但针对离心加速预制的水泥基材料的力学性能仍缺乏系统性探索。本文基于远心数字图像相关(DIC)技术,研究离心加速度a对预制水泥基材料压缩力学性能与裂缝演化规律的影响,重点分析弹性模量、泊松比及抗压强度等关键参数。结果表明:离心力驱动的颗粒迁移可显著提升材料密实性,且在a=60g时达到最优状态,密实化达到峰值,弹性模量增加了337%,泊松比增加了21.7%,整体抗压强度提升26.8%,上述参数沿试件高度方向增幅显著。同时,裂缝多呈现平行于加载方向的劈拉特征;随着离心加速度增大,水泥基材料逐渐呈现剪切与劈拉混合破坏模式,但仍以劈拉破坏为主导。

    Abstract:

    Current research has revealed patterns of performance variation in concrete materials through aspects such as mix proportions and curing duration. However, systematic exploration of the mechanical properties of centrifugally accelerated prefabricated cement-based materials remains scarce. This study investigates the effects of centrifugal acceleration?on the compressive mechanical performance and crack evolution patterns of prefabricated cement matrices using centrifugal digital image correlation (DIC) technology, with a focus on key parameters including elastic modulus, Poisson’s ratio, and compressive strength. Experimental results demonstrate that particle migration driven by centrifugal forces significantly enhances material compactness, reaching optimal conditions at?a=60g where densification peaks. Under this acceleration, elastic modulus increased by 337%, Poisson’s ratio rose by 21.7%, and overall compressive strength improved by 26.8%. These parameters exhibit pronounced growth gradients along the specimen height. Furthermore, cracks predominantly exhibited tensile-splitting characteristics parallel to the loading direction. As centrifugal acceleration increased, the cement-based materials gradually transitioned toward a mixed shear and tensile-splitting failure mode, though tensile-splitting failure remained dominant.

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  • 收稿日期:2025-06-24
  • 最后修改日期:2025-08-18
  • 录用日期:2025-08-20
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