不同粗聚合物体积分数的混凝土的双K断裂强度
Xiao Li1, Ying Zhang2, Yanwei Chen2
1School of Civil and Architectural Engineering, Hebei University of Engineering Science, Shijiazhuang 050091, China.
Materials (Basel, Switzerland)
|December 31, 2025
概括
优化混凝土混合设计,这项研究表明,粗聚合物体积分明显影响断裂性和机械性能. 37%的最佳分数最大化了裂纹阻力,而25-31%为工程结构提供了最佳平衡.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 断裂力学 断裂力学 断裂力学
背景情况:
- 混凝土的机械性能和断裂性对于结构完整性至关重要.
- 粗聚合物体积分数 (V_a) 对这些属性的影响需要进行详细的研究,以优化混合物设计.
研究的目的:
- 为了研究变化的粗聚合物体积分 (V_a) 对混凝土的双K断裂性和机械性能的影响.
- 建立关键机械性能和断裂参数之间的定量关系.
- 提出一个安全警告参数来评估混凝土的高峰前柔性.
主要方法:
- 在19%至50%的V_a范围内对混凝土样本进行了形分裂试验.
- 测量的压力强度 (f_c),弹性模量 (E),拉伸强度 (f_t) 和双K断裂性 (KICini,KICun,G_IF).
- 分析了裂纹路径的曲率,并推导出安全警告参数 (δ).
主要成果:
- 压力强度和弹性模量随着V_a的增加而增加.
- 拉力强度,破裂性和破裂能量在V_a = 37%的峰值,表明对抗裂纹的最佳总含量.
- 拉伸强度和断裂参数之间建立了定量关系;安全警告参数在0.88到0.72.7之间.
结论:
- 粗聚合物体积分数显著影响混凝土的机械行为和断裂特性.
- 37%的最佳V_a最大限度地提高了断裂性,而25%-31%的V_a范围平衡了抗裂和安全预警能力.
- 这些发现为设计工程应用的混凝土混合物提供了重要的指导,提高了工程应用的性能和安全性.
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