再生混凝土粉在自密实混凝土中的应用

H. Kasami, M. Hosino, T. Arasima, H. Tateyasiki
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引用次数: 13

摘要

虽然日本每年产生3700万吨混凝土废料,但由于水泥膏体和砂浆黏附,再生骨料密度低,吸收率高,因此使用再生骨料制作混凝土受到限制。近年来发展了一种通过对混凝土碎料进行加热和研磨,分离水泥粘附在骨料上的新方法,以生产高质量的再生骨料。在此过程中,产生细度为400 m2/kg的副产粉。副产品再生混凝土粉由水化水泥的细颗粒和破碎的骨料组成。为了利用再生混凝土粉作为混凝土添加剂,进行了两个系列的试验,以明确再生混凝土粉的效果。对再生混凝土粉、高炉矿渣粉和石灰石粉配制的自密实混凝土进行了坍落度、抗压强度、弹性模量和干燥收缩率试验。用再生混凝土粉配制的高效减水剂降低了混凝土的超塑效果。掺再生混凝土粉的混凝土抗压强度与掺石灰石的相同,但低于掺矿渣的混凝土。掺有再生混凝土粉的混凝土比掺有矿渣和石灰石的混凝土弹性模量更低,干收缩率更高。再生混凝土粉可用于自密实混凝土,无需进一步处理,尽管可能增加高范围减水剂的剂量,以给定坍落流和干燥收缩。在自密实混凝土中掺入磨碎的高炉矿渣和再生混凝土粉,改善了高范围减水剂的超塑效果,改善了混凝土的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Use of Recycled Concrete Powder in Self-Compacting Concrete
Although 37 million tons of concrete wastes have been generated annually in Japan, the use of recycled aggregate for concrete is limited because of low density and high absorption due to adhered cement paste and mortar. A new method to produce high quality recycled aggregate by heating and grinding concrete rubbles to separate cement portions adhering to aggregate was developed recently. In this process, by-product powder with the fineness of 400 m2/kg is generated. By-product recycled concrete powder consists of fine particles of hydrated cement and crushed aggregate. To utilize the recycled concrete powder as concrete additives two series of experiments were performed to make clear the effect of recycled powder. Self-compacting concrete with recycled concrete powder, ground blast-furnace slag and ground limestone were tested for slump-flow, compressive strength, modulus of elasticity and drying shrinkage. Reduction in superplasticizing effect of high-range water reducer was found for concrete with recycled concrete powder. Compressive strength of concrete with recycled concrete powder was the same as those with ground limestone, and lower than those with ground slag. Concrete with recycled concrete powder showed lower elastic modulus and higher drying shrinkage than those with ground slag and ground limestone. The recycled concrete powder is usable for self-compacting concrete without further processing, despite the possible increase in dosage of high-range water reducer for a given slump-flow and in drying shrinkage. The addition of ground blast-furnace slag together with recycled concrete powder to self-compacting concrete improved superplasticizing effect of high-range water reducer and properties of concrete.
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