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首页> 美国卫生研究院文献>Materials >Properties of Concrete Using Treated Low-Class Recycled Coarse Aggregate and Blast Furnace Slag Sand
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Properties of Concrete Using Treated Low-Class Recycled Coarse Aggregate and Blast Furnace Slag Sand

机译：处理过的低等级再生粗骨料和高炉矿渣砂的混凝土性能

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摘要

Since high quality natural aggregates are becoming scarce, it is important that industrial recycled products and by-products are used as aggregates for concrete. In Japan, the use of recycled aggregate (RG) is encouraged. Since, strength and durability of recycled aggregate concrete is lower than that of normal aggregate concrete, the use of recycled aggregate has not been significant. In order to improve physical properties of concrete using recycled coarse aggregate, blast furnace slag sand has been proposed. Recently, blast furnace slag sand is expected to improve durability, freezing, and thawing damage of concrete in Japan. Properties of fresh and hardened concrete bleeding, compressive strength, and resistance to freezing and thawing which are caused by the rapid freezing and thawing test using liquid nitrogen is a high loader than the JIS A 1148 A method that were investigated. As a result, concrete using treated low-class recycled coarse aggregate and 50% or 30% replacement of crushed sand with blast furnace slag sand showed the best results, in terms of bleeding, resistance to freezing and thawing.
机译：由于高质量的天然骨料正变得稀缺，因此重要的是将工业再生产品和副产品用作混凝土骨料。在日本，鼓励使用再生骨料（RG）。由于再生骨料混凝土的强度和耐久性低于普通骨料混凝土，因此再生骨料的使用并不重要。为了改善使用再生粗骨料的混凝土的物理性能，已经提出了高炉矿渣砂。最近，在日本，高炉矿渣砂有望改善混凝土的耐久性，冻结性和解冻性。由液氮的快速冷冻和融化试验引起的新鲜和硬化混凝土的渗出性能，抗压强度和抗冻融性比所研究的JIS A 1148 A方法高。结果，就渗色，抗冻融性而言，使用处理过的低等级再生粗骨料并用高炉矿渣砂替代碎砂的50％或30％的混凝土表现出最好的效果。

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