The elimination of metal waste generated during the initial manufacturing processes of industrial plants and workshop machines still a big problem. The current investigation dealt with adding the metal wastes produced by machinery processing such as iron filings powder, iron turning lathe, and aluminum turning lathe to improve the structural performance of oneway ribbed slab (RS) panels. Two types of concrete were considered in this work; Ferro cement (FER) and self-compacting concrete (SCC). The reinforced concrete panels with iron filings powder and iron turning lathe showed an increase in the ultimate load and a decrease in the central deflection, while the panels with aluminum turning lathe revealed an opposite behavior. The significant effect of using metal wastes is the superior resistance to crack propagation by increase the bond between fibers and cement mortar across the cracks. Adding the metal wastes with fine particles improves the concrete strength providing the workability must be controlled. Using the lathe as an iron fiber with a specific shape factor has a side effect due to fiber balling in the concrete mix. Also, high percentages of filings iron powder cause agglomerate the powder particles due to magnetic attraction forces.
Voided slabs are reinforced concrete slabs in which voids allow to reduce the amount of concrete. The bubbled deck slab is a new and sustainable biaxial floor system to be used as a self-supporting concrete floor. The use of voided slabs leads to decrease the consumption of materials and improve the insulation properties for enhancing the objectives of sustainability. This study presents an investigation into the flexural behavior of sustainable Reactive Powder Concrete RPC bubbled slab flooring elements. Six one-way slabs were cast and tested up to the failure. The adopted variables in this study are: the volumetric ratio of steel fibers, type of slab; bubbled or solid, placing of reinforcement and thickness of slab. The effect of each variable on the ultimate load, deflection and strain has been discussed. The results show that increasing the percent of steel fibers from 1% to 2% in solid and bubbled slabs decreases the deflection by (18.75%) and (50%) respectively. As well as, the deflection increases by (41%) for bubbled slab compared to the solid slab. The slabs reinforced with top and bottom steel meshes show less deflection than slabs reinforced by only bottom steel mesh.
Currently, the industry of construction requires finding efficient materials to increase the durability and strength as well as decreasing the concrete structure’s total weight. Therefore, an effort was made in this study for examining the impact of adding waste materials such as the iron lathing waste fibers. Iron lathe wastes have been deformed into twisted strips with a width of (4mm) and sieving size of (4.75-10) mm. The experimental investigation has been achieved with the use of four mixes related to light-weight concretes, involving different volumetric ratios of the iron lathing waste fibers as (0%, 1 %, 1.5 %, and 2 %). With the increase in the volume fraction of the lathing waste fibers from 0% to 2%, the results showed that there were a significant increase and improvement in compressive strength, splitting tensile strength, flexural tensile strength, static modulus of elasticity, and dynamic modulus of elasticity by 12%, 67.5%, 134%, 27%, and 26% respectively. This indicates that the iron waste fibers have an important impact in enhancing the mechanical properties of the hardened concrete through the structural change in the concrete matrix.
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