Scholarlink

<p>Cement concrete is the most widely used material in the building sector all over the world since concrete plays a vital role in infrastructure development. The utilization of concrete in the field of construction is gradually increasing, which exploits natural resources. The use of concrete waste can reduce the exploitation of natural resources. However, the main distinction between recycled waste concrete coarse aggregate (WCA) and natural coarse aggregate (NCA) is the presence of adhering mortar on the surface of recycled aggregate, which reduces the mechanical qualities of concrete. This research compares the effectiveness of the Image Analysis Method (IAM) for finding out the actual adherence to the mortar content of WCA with the heating and cooling methods. The findings showed that WCA with a size of 12.5–20&#xa0;mm gives better performance in concrete due to less adhered content and is termed as treated WCA. Also, it is obtained that the error margin between IAM and heating and cooling methods is within a range of 2.2%-4.6%. Moreover, this research compares the strength of NCA and treated WCA-based concrete and adds metakaolin as an admixture (2.5%, 5%, 7.5%, 10%, 12.5%, and 15% of the weight of the binder) in WCA-based concrete. The mechanical strength, split tensile strength, and flexural strength of treated WCA-based concrete incorporated with 10% MK are increased to 3.70%, 30.60%, and 18.18% respectively, which is more than that of the NCA-based concrete after 28 days of curing. The water absorption (%), UPV and rebound hammer of treated WCA-based concrete incorporated with 10% MK are equivalent to NCA-based concrete.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

An empirical study examining the characteristics of metakaolin-based concrete with recycled waste concrete coarse aggregate

  • 期刊论文

  • 发表日期：

    2025年8月30日

查看全文
  • Biswajit Majhi,
  • Siprarani Pradhan,
  • Benazeer Sultana,
  • Chhabirani Tudu

摘要

Cement concrete is the most widely used material in the building sector all over the world since concrete plays a vital role in infrastructure development. The utilization of concrete in the field of construction is gradually increasing, which exploits natural resources. The use of concrete waste can reduce the exploitation of natural resources. However, the main distinction between recycled waste concrete coarse aggregate (WCA) and natural coarse aggregate (NCA) is the presence of adhering mortar on the surface of recycled aggregate, which reduces the mechanical qualities of concrete. This research compares the effectiveness of the Image Analysis Method (IAM) for finding out the actual adherence to the mortar content of WCA with the heating and cooling methods. The findings showed that WCA with a size of 12.5–20 mm gives better performance in concrete due to less adhered content and is termed as treated WCA. Also, it is obtained that the error margin between IAM and heating and cooling methods is within a range of 2.2%-4.6%. Moreover, this research compares the strength of NCA and treated WCA-based concrete and adds metakaolin as an admixture (2.5%, 5%, 7.5%, 10%, 12.5%, and 15% of the weight of the binder) in WCA-based concrete. The mechanical strength, split tensile strength, and flexural strength of treated WCA-based concrete incorporated with 10% MK are increased to 3.70%, 30.60%, and 18.18% respectively, which is more than that of the NCA-based concrete after 28 days of curing. The water absorption (%), UPV and rebound hammer of treated WCA-based concrete incorporated with 10% MK are equivalent to NCA-based concrete.