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Variations in surface quality of self-consolidation and highly workable concretes with formwork material

机译：使用模板材料的自固结和易加工混凝土的表面质量变化

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摘要

The effect of the forming materials on surface quality of the self-consolidating and highly workable concretes was experimentally evaluated. Several mixtures having wide ranges of workability and rheology were investigated. The mixtures were placed in a Z-shaped mold. No mechanical consolidation was applied at all. The sides of the mold were built up using plywood, PVC, steel, and permeable formwork liner using a polyester filter. The concrete surface quality was evaluated in terms of the voids, bleeding, segregation, and insufficient self-consolidation, using an image processing technique. The surface diameter and area of the voids found on the formed concrete surfaces were statistically correlated to the concrete rheology. The permeable lined formwork was shown to produce concrete surfaces with better quality compared to impermeable formwork materials. The same outcome was also noticed for the concrete mixtures having insufficient self-consolidation and even the unstable mixtures that manifested signs of bleeding. The permeable lined formwork was shown to provide an effective way for the entrapped air/water bubbles and the bleed water to escape. The maximum surface dimension of the voids found on the concrete surfaces was limited to 3, 6, 7, and 10 mm for the mixtures cast using the permeable liner, steel, PVC, and plywood formwork materials, respectively. Published by Elsevier Ltd.
机译：实验评估了成型材料对自固结和高度可加工混凝土表面质量的影响。研究了具有广泛的可加工性和流变性的几种混合物。将混合物置于Z形模具中。完全不进行机械加固。模具的侧面使用胶合板，PVC，钢和可渗透模板衬板（使用聚酯过滤器）构建。使用图像处理技术，根据空隙，渗出，偏析和不充分的自固结来评估混凝土表面质量。在形成的混凝土表面上发现的空隙的表面直径和面积与混凝土的流变学统计相关。与不渗透模板材料相比，可渗透衬里的模板可以生产出质量更高的混凝土表面。对于自混合不足的混凝土混合物，甚至是表现出渗水迹象的不稳定混合物，也都观察到了相同的结果。展示了带衬里的可渗透模板，它为包裹的气泡/水和排出的水提供了有效的逃逸方法。对于使用可渗透衬板，钢，PVC和胶合板模板材料浇铸的混合物，在混凝土表面上发现的空隙的最大表面尺寸分别限制为3、6、7和10 mm。由Elsevier Ltd.发布

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  • 来源
    《Construction and Building Materials》 |2020年第30期|117638.1-117638.12|共12页
  • 作者

  • 作者单位

    Univ Sherbrooke 2500 Boul Univ Sherbrooke PQ J1K 2R1 Canada|Menoufia Univ Menoufia Egypt;

    Missouri S&T 500 W 16th St Rolla MO 65409 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bug holes; Concrete surface; Formwork; Image processing; Segregation;

    机译：虫洞;混凝土表面;模板;图像处理;隔离;

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