Experimental analysis of the impact of alternating magnetic fields on the compressive strength of concrete with various silica sand and microsilica compositions

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Mohammad Mahdi Amini, Morteza Ghanepour, Omid Rezaifar
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Abstract

This research experimentally assessed the compressive strength enhancement of 7- and 28-day concrete specimens with up to 20 % silica sand and micro silica under an alternating magnetic field up to 1 Tesla. By applying magnetic fields to hardened concrete, properties can be tailored to specific needs, thus lowering cement usage and CO2 production. It was found that adding 10 % micro silica reduced the compressive strength at 7 and 28 days, while using 10 % silica sand and 5 % micro silica increased the compressive strength by 14.55 % and 7.79 %, respectively. Exposing specimens to a magnetic field increased compressive strength, with improvements up to 60.36 % for 7-day and 48.02 % for 28-day concrete at 1 T. Incorporating silica sand and micro silica in concrete positively impacts compressive strength under a magnetic field. Silica sand enhances compatibility with additives, improving strength. However, substituting 10 % of cement with micro silica reduces strength due to decreased aggregate adherence. 7-day specimens are more susceptible to magnetic fields than 28-day specimens due to lower displacement in younger samples. This innovative method enables controlled material behavior under magnetic influence. It aims to reduce cement usage while compensating for strength reduction caused by micro silica substitution. The study also determines the minimum magnetic field needed to counteract strength decrease; the aspects which not previously explored.

交变磁场对不同硅砂和微硅石成分混凝土抗压强度影响的实验分析
这项研究通过实验评估了在高达 1 特斯拉的交变磁场下,硅砂和微硅含量高达 20% 的 7 天和 28 天混凝土试样的抗压强度增强情况。通过对硬化混凝土施加磁场,可根据特定需求调整性能,从而降低水泥用量和二氧化碳排放量。研究发现,添加 10 % 微硅会降低 7 天和 28 天的抗压强度,而使用 10 % 硅砂和 5 % 微硅会使抗压强度分别提高 14.55 % 和 7.79 %。将试样暴露在磁场中可提高抗压强度,在 1 T 的条件下,7 天和 28 天混凝土的抗压强度分别提高了 60.36% 和 48.02%。在混凝土中加入硅砂和微硅石会对磁场下的抗压强度产生积极影响。硅砂可增强与外加剂的相容性,从而提高强度。不过,用微硅代替 10% 的水泥会降低强度,因为骨料的附着力降低了。与 28 天试样相比,7 天试样更容易受到磁场的影响,因为较年轻的试样位移较小。这种创新方法可以控制材料在磁场影响下的行为。其目的是减少水泥用量,同时补偿微硅石替代物造成的强度降低。这项研究还确定了抵消强度降低所需的最小磁场;这些方面以前都没有探索过。
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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