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DEVELOPING PRACTICAL SCC MIXES FOR SURFACE QUALITY AT A SMALL PRECAST CONCRETE PLANT

机译:在小型预制混凝土厂中开发实用的SCC混合物以提高表面质量

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摘要

The use of SCC in precast concrete plant could increase rate of concrete placing, reduce labour needs, cut energy demands, extend the life of moulds, and particularly provide a much improved working environment due to the removal of vibration compaction. Such combined benefits make SCC a very attractive option for precast concrete applications. However, for a small precast plant, there still remain many practical difficulties/problems in producing satisfactory SCC mixes. For example, in many cases, SCC has to be produced using existing local materials and without additional powder materials, and usually with very limited production/quality controls available. Furthermore, the increase in materials cost has to be acceptable and the SCC mixes produced have the specific mix properties required for a given application.This paper presents a study to develop practical SCC mixes using local materials and a suitable combination of admixtures at a small precast plant, and particularly to identify suitable fresh properties for the SCC mixes to achieve improved surface quality of concrete elements produced.
机译:在预制混凝土工厂中使用SCC可以提高混凝土浇筑速度,减少人工需求,减少能源需求,延长模具的使用寿命,并且由于消除了振动压实,因此可以大大改善工作环境。这些综合优点使SCC成为预制混凝土应用中非常有吸引力的选择。然而,对于小型的预制工厂,在生产令人满意的SCC混合物时仍然存在许多实际困难/问题。例如,在许多情况下,必须使用现有的当地材料生产SCC,而无需使用其他粉末材料,并且通常只能使用非常有限的生产/质量控制。此外,材料成本的增加必须可以接受,并且所生产的SCC混合物具有特定应用所需的特定混合物特性。本文提出了一项研究,以开发一种使用本地材料和合适的小掺量混合物适当组合的SCC混合物。特别是为SCC混合物确定合适的新鲜特性,以提高所生产混凝土构件的表面质量。

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