高容量矿物添加剂蒸汽固化砂的先进毛孔结构特征使用X射线计算机断层学
Yuntian Wang1,2,3, Songlin Xie4, Yushu Li1
1School of Urban Construction, Chengdu Polytechnic, Chengdu 610041, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
蒸汽固化可能会损坏混凝土,但补充性水泥材料 (SCM) 有助于. 用水进行后固化可通过优化孔隙结构显著提高混凝土的强度和耐用性,使预制混凝土的寿命更长.
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.
- 混凝土技术 混凝土技术
背景情况:
- 蒸汽固化对于预制混凝土是常见的,但会导致热损伤,降低耐用性和强度.
- 补充性水泥材料 (SCM) 可以改善混凝土的孔隙结构,并减轻蒸汽固化的负面影响.
研究的目的:
- 研究蒸汽固化温度和随后的固化方法对富含SCM砂的孔隙特性的影响.
- 评估固化方案对蒸汽固化混凝土机械性能和耐久性的影响.
主要方法:
- 使用高分辨率的X射线计算机断层扫描 (X-CT) 来分析毛孔结构.
- 具有高SCM含量的砂样本经过了各种蒸汽固化温度和固化后的调节.
- 测量了压力和屈曲强度,以评估机械性能.
主要成果:
- 较高的蒸汽固化温度增加了孔隙性,降低了机械强度.
- 在蒸汽固化后的水固化 (ST8012-WA) 与自然固化 (ST8012-NA) 相比,增强了9%的压力强度和19.8%的屈曲强度.
- 标准固化样本 (SD) 显示了最高的压力强度,表明蒸汽固化升高的不利影响.
结论:
- 高蒸汽固化温度会对混凝土的机械性能和耐用性产生负面影响.
- 固化后的技术,特别是水固化,对于减轻热损伤和改善混凝土质量至关重要.
- 优化的固化策略可以提高蒸汽固化预制混凝土组件的寿命和性能.
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