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首页> 外文会议>RILEM Proceedings PRO 41; RILEM International Symposium on Environment-Conscious Materials and Systems for Sustainable Development; 20040906-07; Koriyama(JP) >EFFECTS OF RUBBING ACTION IN MANUFACTURING PROCESS OF RECYCLED COARSE AGGREGATE FROM WASTE CONCRETE ON STRENGTH AND DURABILITY OF RECYCLED CONCRETE PRODUCTS
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EFFECTS OF RUBBING ACTION IN MANUFACTURING PROCESS OF RECYCLED COARSE AGGREGATE FROM WASTE CONCRETE ON STRENGTH AND DURABILITY OF RECYCLED CONCRETE PRODUCTS

机译：废旧混凝土再生粗骨料制造过程中的摩擦作用对再生混凝土制品强度和耐久性的影响

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摘要

In 2000, the quantity of Japan's waste concrete amounted to 35 million tons and the percentage of their recycling was 96%, as being reused mostly into lower base material in road pavements. From the effective utilization of finite resources, it is necessary to study how to reuse recycled aggregate from waste concrete into new concrete. This paper describes about effects of the rubbing action in the third manufacturing process of recycled coarse aggregate from waste concrete on the strength and durability of recycled concrete products. The recycled coarse aggregate rubbed in the third process remarkably improved their physical properties and their strength increased 42% than the coarse aggregate recycled in the second process. The strength of concrete products reused the third processed coarse aggregate increased 21% at 14-day age and 17% at 28-day age, compared with the concrete products reused the second processed coarse aggregate. The freeze-thaw durability of both concrete products was almost similar. Consequently, influencing the rubbing action in the manufacturing process improved both qualities of recycled coarse aggregate and recycled concrete products, because the rubbing action caused to make round aggregate corner while removing mortar from aggregate surface.
机译：2000年，日本的废旧混凝土总量为3500万吨，其回收利用率为96％，主要用于道路路面的低级基础材料中。从有限资源的有效利用出发，有必要研究如何将废弃混凝土中的再生骨料再利用为新混凝土。本文描述了废旧混凝土再生粗骨料第三制造过程中的摩擦作用对再生混凝土产品的强度和耐久性的影响。与第二步中回收的粗骨料相比，第三步中研磨的粗骨料的物理性能显着提高，强度提高了42％。与经过第二次加工的粗骨料再利用的混凝土产品相比，经过第三次加工的粗骨料的混凝土产品的强度在14天时提高了21％，在28天时提高了17％。两种混凝土产品的冻融耐久性几乎相似。因此，在制造过程中影响摩擦作用可改善再生粗骨料和再生混凝土产品的质量，因为摩擦作用导致在骨料表面去除砂浆的同时使骨料产生圆角。

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