This paper presents a new pre cast U-shape ferrocement forms reinforced with various types of metallic and non-metallic mesh reinforcement. This research was designed to investigate the feasibility and effectiveness of employing various types of reinforcing meshes in the construction of structural slabs incorporating permanent U-shape ferrocement forms as a viable alternative for conventional reinforced concrete slabs. Fiber glass meshes reinforcement was used for durability and protection against corrosion of reinforcing steel. To accomplish this objective, an experimental program was conducted. The experimental program comprised casting and testing ten slabs having the total dimensions of 500x100x2500 mm incorporating 40 mm thick U-shape permanent ferrocement forms. Series A consists of two conventionally reinforced concrete slabs were cast and tested and used as control slab without fibers and with fibers, volume fraction, 2.05 % and 2.177 %. Series B comprises of two slabs reinforced with one and two layers of expanded steel mesh, volume fraction 2.09 and 2.42% respectively. Series C comprises two slabs reinforced with two and four layers of welded galvanized steel mesh, having volume fraction 2.05 and 2.189% respectively. Series D Consists of two slabs reinforced with one layer and two layers of fiber glass meshes, having volume fraction 2.107 and 2.277% respectively. Series E comprises two slabs reinforced with 2 layers expanded steel mesh and one layer expanded steel mesh, having volume fraction 1.357 and 2.750 % respectively. The test specimens were tested as simple slabs under four-line loadings condition on a span of 2300mm. The performance of the test slabs in terms of strength, stiffness, strains, cracking behavior, ductility, and energy absorption properties was investigated. The behavior of the developed slabs was compared to that of the control slabs. The experimental results showed that high ultimate and serviceability loads, better crack resistance control, high ductility, and good energy absorption properties could be achieved by using the proposed slabs and low cost compared with control specimen.
The response of buried concrete structures to the effect of blast loads is of great importance. Various parameters including the depth and weight of explosive charge, soil properties and the relative location of the buried structure to the explosive charge affect the structural performance of buried structures. In this paper, the influence of burial depth of explosive charge is numerically investigated using the new proposed finite element model developed and described in a previous work for the authors. The burial depth of explosive charge is considered to be varied between 0.0 m to 6.0 m. A comparison evaluation is carried out between the study of varying charge depth and the study of varying the burial depth of the structure. This investigation covers the blast wave propagation, structure response and damage analysis for buried reinforced concrete structures. The paper shows that buried explosions result in significant effects on the structure response than the surface explosions with the same conditions.
The marked brittleness with low tensile strength of plain concrete can be overcome by the addition of steel fibres (SF). This paper investigates the mechanical properties of steel fibre reinforced concrete (SFRC) and spiral steel fibre reinforced concrete (SSFRC). The properties included compressive and splitting tensile strength, modulus of rupture, and toughness index. The steel fibres were hook-ended shape with aspect ratio (l/d=50). The introduced shape was spiral steel fibres (SSF) with diameter of spiral=1.5 cm. The two shapes of steel fibres were added at the volume fraction of 0.5%, 1.0%,2.0%, and 3.0%. All the mechanica1 properties of SFRC enhanced up to 2.0% volume fraction of fibers, whereas the mechanical properties of SSFRC enhanced up to 3.0% volume fraction. The compressive strength of SFRC and SSFRC enhanced by 43.4% and 65% respectively relative to plain concrete. The splitting tensile strength of SFRC and SSFRC enhanced by 52.6% and 147% respectively relative to plain concrete. The modulus of rupture of SFRC and SSPRC enhanced by 137.5%, and 62.5% respectively relative to plain concrete. The toughness index of SPRC improved with increasing the fraction up to 2.0%. The indices I 5 , I 10 , and I 20 registered values of 10.7, 20.5, and 35.1 at 2.0% fraction. The toughness index of SSFRC improved with increasing the fraction up to 3.0%. The indices I 5 , I 10 , and I 20 registered values of 9.76, 18.78, and 35.8, respectively, at 3.0% volume fraction.
Concrete panels are usually used to provide protection against incidental dynamic loadings such as the impact of a steel projectile. In this paper finite element technique is used to investigate the dynamic behavior and failure conditions of reinforced concrete panels subjected to the projectile impacts. Finite element model calibration was based on some experimental results conducted by M.E. Mohamed et al." Experimental Analysis of Reinforced Concrete Panels Penetration Resistance". Nonlinear three-dimensional numerical simulation of this experimental investigation was carried out using AUTODYNE, which is probably the most extensive code dealing with penetration problems. A comparison was conducted between the results calculated by the finite element method with field measurement and show relatively good agreement. The aim of this paper is to study numerically the penetration resistance of ferrocement panels reinforced with different number of layers and the main findings show an enhancement in the penetration resistance of about 30% with using ferrocement panels on other hand, the results showed that increasing number of layers of steel meshes have slight influence on the penetration resistance of these panels.
Protective layers of fortified structures are considered key points in resisting missiles. Most of these protective layers are made from plain concrete. Due to the progressive development of military destructive weapons such as hyper-velocity missiles, plain concrete protective layers are not sufficient to resist the effect of hyper-velocity objects. So it is essential to have a new generation of protective layers to able to resist this kind of weapons. The objective of this paper is to enhance the protective layer material through designing a special concrete mixture with high reliability to resist the penetration of hyper-velocity object. Ferrocement technique is used to enhance the concrete panels' penetration resistance. A parametric study is performed on the effect of changing number of the steel wire mesh layers inside the concrete panels on its penetration resistance. The study in this paper is based on the finite element model verification conducted by M.E. Mohamed et al. using AUTODYN-3D on "Numerical Simulation of Projectile Penetration in Reinforced Concrete Panels" [1]. Also, plain concrete and ferrocement panels' penetration resistance was studied under the effect of hypervelocity objects. This Hyper-velocity projectile was presented in experimental work conducted by Dawson [2]. The main findings of this paper were that there is an enhancement in the penetration resistance for ferrocement panels rather than plain concrete once. Also increasing of steel layers mesh number have slight influence on the penetration resistance of the ferrocement panels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.