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International Concrete Abstracts Portal

Showing 1-5 of 10 Abstracts search results

Document: 

18-440

Date: 

November 1, 2019

Author(s):

Arturo D’Alessandro, David J. Corr, and Surendra P. Shah

Publication:

Materials Journal

Volume:

116

Issue:

6

Abstract:

Ferrocement is a construction material that (in comparison to traditional reinforced concrete) provides superior crack control, impact resistance, and toughness. However, while extensive literature exists on the deterioration mechanisms and maintenance of reinforced concrete structures, little attention has been given to the durability of ferrocement. In this study, the adoption of ethyl silicate, a newly developed nanomaterial, is investigated to improve durability of ferrocement. Such nanomaterials are expected to penetrate the cementitious matrix without changing the appearance of the surface. Once penetrated, pozzolanic behavior is displayed forming calcium silicate hydrate and consequently increasing durability and mechanical performance. Particular attention is given to the carbonation-induced corrosion of reinforcement, which should be considered a major concern in ferrocement due to the initially small diameter of the mesh wires and the thin mortar cover. Despite its importance, there is a limited amount of literature on carbonation-induced corrosion of ferrocement structural elements.

DOI:

10.14359/51716821


Document: 

105-M13

Date: 

March 1, 2008

Author(s):

Md. Zakaria Hossain

Publication:

Materials Journal

Volume:

105

Issue:

2

Abstract:

Ferrocement, a reinforced cementitious composite, may attain its optimal reinforcing capability for soil reinforcement applications owing to its synergetic action from two components of wire mesh and mortar. This paper presents some experimental results on the performance behavior and failure modes of ferrocement elements reinforced with woven square mesh and chicken mesh under pullout tests in two types of backfill materials. It is demonstrated that the failure modes of ferrocement depend on the surface properties of ferrocement, mortar composition, and type of mesh. Tests results reveal that square mesh-reinforced ferrocement with smooth surface shows frictional failure only under normal stresses, whereas with chicken mesh-reinforced ferrocement, there is mortar failure at higher normal stresses. It is also observed that the pullout resistance of ferrocement is improved significantly by using some small parallel channels on the surface of ferrocement elements transversely to the pullout direction. In the case of ferrocement containing two, four, and six channels, only the mortar failure is observed for square mesh-reinforced ferrocement, whereas the mesh failure is apparent for chicken mesh-reinforced ferrocement. A discussion regarding the corrosion of ferrocement elements as embedded in soil and a comparison between this technique and other soil reinforcement methods, such as geogrids or geosynthetics, in terms of cost, strength, and durability, are presented.

DOI:

10.14359/19751


Document: 

105-M04

Date: 

February 1, 2008

Author(s):

M. A. Mansur, Mohamed Maalej, and Mohammad Ismail

Publication:

Materials Journal

Volume:

105

Issue:

1

Abstract:

An electrochemical-based accelerated corrosion technique has been employed to study the corrosion durability of ferrocement. Variables considered include cover thickness; composition of the matrix in terms of water-cement ratio (w/c), sand-cement ratio (s/c),and contents of mineral and chemical admixtures; and use of stainless steel wire mesh. After suitable exposure, maximum crack width, percentage of steel loss, and reduction in flexural strength served as the bases for assessing the relative performance of various means considered. Test results indicate that the addition of mineral admixtures, application of a suitable surface coating, and the use of deeper concrete cover provide excellent protection against reinforcement corrosion. Employment of stainless steel as reinforcement and the use of so-called corrosion inhibitor or a low w/c in the matrix also slows down the corrosion process, but is not as effective as others. Based on test results, a hybrid protection system combining three lines of defense is suggested for enhanced durability of ferrocement.

DOI:

10.14359/19204


Document: 

104-M39

Date: 

July 1, 2007

Author(s):

Chote Soranakom and Barzin Mobasher

Publication:

Materials Journal

Volume:

104

Issue:

4

Abstract:

A closed form solution is presented for the moment-curvature response of cement-based composites with homogeneously distributed reinforcement. The derivation is based on parametric representation of uniaxial material constitutive response using piece-wise linear and quadratic segments. Effects of tensile and compressive constitutive relations on moment-curvature response were studied and it was observed that the tensile stiffness from the first cracking to the ultimate tensile strength and the ultimate tensile strain were the most important parameters. The momentcurvature relation was combined with crack localization rules to simulate the flexural load-deformation response of a beam under four-point loading conditions. Model simulations indicate that the direct use of uniaxial tension stress-strain response underpredicts the flexural results. This is attributed to the differences in the effective volume of the material subjected to critical stress. By applying a single scaling factor to material models, the model simulations can match the experimental data.

DOI:

10.14359/18824


Document: 

91-M16

Date: 

March 1, 1994

Author(s):

Hamoud Ahmad Farhan Dehwah, Islem Ahmad Basunbul, Mohammed Maslehuddin, Ghazi Jamil Al-Sulaimani, and Mohammed Hussain Baluch

Publication:

Materials Journal

Volume:

91

Issue:

2

Abstract:

In this investigation, the durability performance, namely, resistance to reinforcement corrosion of reinforced concrete beams repaired with ordinary cement mortar, polymer-based cementitious mortar, and ferrocement mortar, was evaluated. The effect of temperature fluctuations, representative of the environmental conditions in the arid regions, on the corrosion-resisting characteristics of these repair materials was also evaluated. The performance of these materials was compared with unrepaired concrete beams. Results indicate superior performance by ordinary cement mortar compared to other materials. However, in the structural components subjected to thermal variations, ferrocement mortar was observed to be more beneficial.

DOI:

10.14359/4569


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