UTILIZATION OF SLAG POWDER AND RECYCLED CONCRETE WASTES IN REACTIVE POWDER CONCRETE

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materiali in tehnologije Pub Date : 2023-03-30 DOI:10.17222/mit.2022.701

S. N, G. Shiny Brintha

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引用次数: 0

Abstract

Using recycled wastes and industrial by-products in construction materials has become mandatory to conserve the natural resources and manage waste-disposal environmental problems. This experimental work investigates the workability and strength properties of reactive powder concrete (RPC), utilizing slag powder and finely ground recycled concrete waste as the partial substitutes for cement and quartz sand, respectively. The results for the slump flow, flexural strength, compressive strength, split-tensile strength were analysed for varying contents of the recycled concrete waste in RPC, i.e., (0, 5, 10, 15, 20, 25 and 30) % and a constant slag-powder addition of 20 %. Furthermore, water absorption of the hardened specimens of 28 d of curing was also examined. The results indicated a rise in the water absorption and reduced workability with the increase in the content of recycled concrete in RPC. This was due to porous inter-particle voids in recycled concrete wastes. The strength properties of RPC exhibited superior performance for the substitution of 15 % of quartz sand with recycled concrete waste. A low water-cement ratio and a steel-fibre addition to RPC play an important role in the strength development and durability properties of RPC.

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矿渣粉和再生混凝土废料在活性粉状混凝土中的利用

在建筑材料中使用回收废物和工业副产品已成为保护自然资源和管理废物处置环境问题的强制性规定。利用矿渣粉和细磨再生混凝土废料分别作为水泥和石英砂的部分替代品，研究了活性粉末混凝土(RPC)的和易性和强度特性。分析了RPC中再生混凝土废料含量(0、5、10、15、20、25和30)%和渣粉添加量为20%时坍落度流动、抗弯强度、抗压强度、劈裂抗拉强度的结果。此外，还对固化28 d后硬化试样的吸水率进行了测定。结果表明，随着再生混凝土掺量的增加，混凝土的吸水率升高，和易性降低。这是由于再生混凝土废料中的多孔颗粒间空隙造成的。再生混凝土废料中石英砂的掺量为15%时，RPC的强度性能较好。低水灰比和钢纤维的掺入对RPC的强度发展和耐久性有重要影响。

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来源期刊

Materiali in tehnologije 工程技术-材料科学：综合

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal MATERIALI IN TEHNOLOGIJE/MATERIALS AND TECHNOLOGY is a scientific journal, devoted to original papers and review scientific papers concerned with the areas of fundamental and applied science and technology. Topics of particular interest include metallic materials, inorganic materials, polymers, vacuum technique and lately nanomaterials.