Effects of using pulverized termite mound (PTM) as partial replacement of fine aggregate on the durability properties and microstructure of concrete

IF 0.7 Q3 ENGINEERING, MULTIDISCIPLINARY

Engineering Review Pub Date : 2022-01-01 DOI:10.30765/er.1665

C. Fapohunda, Oluwatosin E. Oladipupo, Luke B. Ajayi

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引用次数: 0

Abstract

The unrestrained use of non-renewable natural resources used in the production of structural concrete raises sustainability concerns. The use of appropriate waste and non-conventional materials is encouraged to address some of these concerns. Understanding the relationship between the durability properties and microstructure of such a material will increase innovation in its use and mitigate some of the environmental issues associated with concrete production. This paper presents the results of a study conducted to evaluate the durability and investigate the microstructure of concrete with fine aggregate partially replaced by pulverized termite mound (PTM). Durability was evaluated by sorptivity and water absorption coefficient tests. Scanning electron microscopy (SEM) was used to study the microstructure of the concrete specimens after 28 days of curing. The results show (i) that the durability of the PTM concrete specimens, as measured by the water absorption coefficient, improves progressively with PTM content, (ii) that the durability of the PTM specimens, as evaluated by sorptivity, improves up to a PTM content of 70%, and (iii) that the microstructure of the concrete specimens has smaller pores compared to the control, which follows the trend of the sorptivity results. Therefore, for practical purposes, the use of PTM mounds as a substitute for fine aggregate in the production of structural concrete should be limited to 70 %.

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白蚁丘粉部分替代细骨料对混凝土耐久性和微观结构的影响

在结构混凝土的生产中无限制地使用不可再生的自然资源引起了对可持续性的关注。鼓励使用适当的废物和非常规材料来解决其中的一些问题。了解这种材料的耐久性和微观结构之间的关系将增加其使用的创新，并减轻与混凝土生产相关的一些环境问题。本文介绍了用粉状白蚁丘(PTM)部分替代细骨料混凝土的耐久性评价和微观结构研究结果。通过吸附率和吸水系数试验对其耐久性进行了评价。采用扫描电镜(SEM)对混凝土试件养护28 d后的微观结构进行了研究。结果表明:(1)以吸水系数衡量的PTM混凝土试件耐久性随PTM含量的增加而逐渐提高;(2)以吸附系数衡量的PTM混凝土试件耐久性在PTM含量为70%时有所提高;(3)与对照相比，PTM混凝土试件的微观结构孔隙较小，这符合吸附系数结果的趋势。因此，在实际应用中，PTM土墩在结构混凝土生产中作为细骨料替代品的使用应限制在70%以内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Review ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

0.00%

发文量

期刊介绍： Engineering Review is an international journal designed to foster the exchange of ideas and transfer of knowledge between scientists and engineers involved in various engineering sciences that deal with investigations related to design, materials, technology, maintenance and manufacturing processes. It is not limited to the specific details of science and engineering but is instead devoted to a very wide range of subfields in the engineering sciences. It provides an appropriate resort for publishing the papers covering prior applications – based on the research topics comprising the entire engineering spectrum. Topics of particular interest thus include: mechanical engineering, naval architecture and marine engineering, fundamental engineering sciences, electrical engineering, computer sciences and civil engineering. Manuscripts addressing other issues may also be considered if they relate to engineering oriented subjects. The contributions, which may be analytical, numerical or experimental, should be of significance to the progress of mentioned topics. Papers that are merely illustrations of established principles or procedures generally will not be accepted. Occasionally, the magazine is ready to publish high-quality-selected papers from the conference after being renovated, expanded and written in accordance with the rules of the magazine. The high standard of excellence for any of published papers will be ensured by peer-review procedure. The journal takes into consideration only original scientific papers.