Abstract
The addition of agricultural and industrial solid wastes and nanomaterials to concrete combined with steel fibers to improve the mechanical and electrical properties of concrete was investigated. This approach could be used in advanced applications in electromagnetic shielding and conductive concrete. Steel fibers were used at 2%wt. of sand and (induction furnace slag (EIF), carbon nanotube (CNT), steel wool fibers, prepared corn husks) at 0.5 and 1 wt.%. of cement. Obtained results of using 1% for both carbon nanotube and steel wool with steel fibers in the mixture 4 and 6, respectively, showed the highest rates of compressive strength. A similar result was shown when tested at 3,7 and 28 days of age and compressive strength was 47.4MPa,47.34MPa for the mixture 4 and 6 respectively. The electrical conductivity and electrical resistance of the samples were measured at the age of 7 days. The findings have also shown that adding steel wool as well as( CNT) gave the best results and the sample containing the furnace slag achieved satisfactory results as well.
Highlights
The study of concrete incorporated with steel fibers has been investigated from the side of physical, mechanical, and electrical properties as well as electromagnetic interference (EMI) in electrical noise
Concrete helped reduce brittleness and increase ductility, but it did not show a significant effect in improving compressive strength.]2[ Emmanuel Ejiofor Anike et al, The effect of adding steel fibers in three different forms with recycled materials in concrete was studied, and the results showed an increase in water absorption.]3[ Ali Toghroli et al, The use of steel fibers helped improve the compressive and bending strength of the concrete.]4[ Ketan Ragalwar et al, The addition of steel fibers and steel wool to ultra-high performance concrete was investigated, and the steel wool significantly increased the concrete resistance.[5]
Carbon nanotube (CNT) from Sky Spring Nanomaterials, Inc. used as a partial substitute for cement in this study Table П shows the physical properties of Multiwall nanotube
Summary
The study of concrete incorporated with steel fibers has been investigated from the side of physical, mechanical, and electrical properties as well as electromagnetic interference (EMI) in electrical noise It creates a disturbance or an unwanted response in electrical circuits and devices and this helps in their use in the military protection of some installations from the impulses resulting from the explosions for example. Agricultural waste was used as a partial substitute for cement by 515% after treatments were carried out to reduce the cost and benefit from the waste and the results of the compressive strength showed the strength of up to 25MPa.[9] Seon Yeol Lee et al, The presence of steel fibers along with the slag helps reduce electrical resistance and increase compressive stress.[10] Nitendra Palankar et al, The use of iron and steel industry waste represented by slag in concrete, which affects cost reduction and waste disposal.[11] D. The current work aims to make use of industrial and agricultural waste by preparing slag powder and corn husk ash and using it as a partial substitute for cement, as well as studying its effect on concrete incorporated with steel fibers by studying the physical and mechanical properties, resistance and electrical conductivity properties
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