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Habib, Ahed
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Civil Engineering, Building, Construction & Architecture

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Tensile Testing of Soils: History, Equipment and Methodologies Al Houri, Ausamah; Habib, Ahed; Elzokra, Ahmed; Habib, Maan
Civil Engineering Journal Vol 6, No 3 (2020): March
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/cej-2020-03091494

Abstract

Tensile strength of soil is indeed one of the important parameters to many civil engineering applications. It is related to wide range of cracks specially in places such as slops, embankment dams, retaining walls or landfills. Despite of the fact that tensile strength is usually presumed to be zero or negligible, its effect on the erosion and cracks development in soil is significant. Thus, to study the tensile strength and behavior of soil several techniques and devices were introduced. These testing methods are classified into direct and indirect ways depending on the loading conditions. The direct techniques including c-shaped mold and 8-shaped mold are in general complicated tests and require high accuracy as they are based on applying a uniaxial tension load directly to the specimen. On the other hand, the indirect tensile tests such as the Brazilian, flexure beam, double punch and hollow cylinder tests provide easy ways to assess the tensile strength of soil under controlled conditions. Although there are many studies in this topic the current state of the art lack of a detailed article that reviews these methodologies. Therefore, this paper is intended to summarize and compare available tests for investigating the tensile behavior of soils.
Evaluation and Restoration of Corrosion-Damaged Post-Tensioned Concrete Structures Alsuwaidi, Hadif; Al-Sadoon, Zaid A.; Altoubat, Salah; Barakat, Samer; Junaid, M. Talha; Maalej, Mohamed; Metawa, Abdulrahman; Habib, Ahed
Civil Engineering Journal Vol 10, No 12 (2024): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-12-02

Abstract

This study addresses the pressing issue of chloride-induced corrosion in post-tensioned (PT) concrete structures, known for their strength and flexibility yet vulnerable to durability issues in extreme climates. The objective is to evaluate corrosion mechanisms in a PT building in the United Arab Emirates and develop a robust restoration strategy. Using a combination of nondestructive and semi-destructive testing methods, this research identifies severe deterioration in critical structural elements, such as steel tendons, PT ducts, and concrete surfaces, largely due to high chloride exposure and aggravated by environmental factors like acid rain and fluctuating temperatures and humidity. The findings reveal serious inadequacies in current maintenance practices, often overlooking long-term corrosion risks in harsh climates. In response, this study proposes a comprehensive repair strategy, including removing damaged materials and applying advanced repair products, protective coatings, and waterproofing measures to enhance the structure's durability. This case study highlights significant concerns regarding structural integrity and provides practical insights into effective maintenance and repair strategies for PT structures. By offering a targeted, sustainable intervention approach, this research contributes to developing PT maintenance protocols, particularly in regions prone to aggressive corrosion, ensuring the longevity and safety of these critical structures. Doi: 10.28991/CEJ-2024-010-12-02 Full Text: PDF
Rehabilitation of Partially Corrosion-Damaged Post-Tensioned Concrete Structures Using Carbon Fiber Reinforced Polymer Alsuwaidi, Hadif; Habib, Ahed; Al-Sadoon, Zaid A.; Maalej, Mohamed; Altoubat, Salah; Barakat, Samer; Junaid, M. Talha
Civil Engineering Journal Vol. 11 No. 6 (2025): June
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-06-014

Abstract

This study provides a comprehensive assessment of the deterioration and rehabilitation of post-tensioned (PT) concrete structures affected by chloride-induced corrosion. Through a detailed case study in the United Arab Emirates, the research identifies moisture ingress and inadequate waterproofing as primary contributors to corrosion in PT tendons and ducts, significantly compromising structural integrity. A rigorous evaluation using nondestructive and semi-destructive testing techniques was conducted to quantify damage and determine the extent of degradation. The results revealed severe corrosion in critical structural elements, necessitating targeted intervention to restore performance and durability. To address these challenges, an integrated rehabilitation strategy was developed, incorporating structural repairs, strengthening through carbon fiber-reinforced polymer (CFRP), and advanced waterproofing techniques. The adopted approach involved enlarging load-bearing components and applying CFRP to enhance flexural strength while minimizing aesthetic alterations. Experimental findings demonstrated that CFRP reinforcement increased slab flexural strength by 30% and reduced crack widths by 23%, effectively mitigating corrosion-related deterioration and extending service life. Furthermore, micro-concrete was utilized in all enlargement locations in compliance with ACI standards, ensuring long-term durability. The proposed rehabilitation framework offers a sustainable solution for extending the service life of PT structures exposed to aggressive environmental conditions. By addressing both immediate structural deficiencies and underlying degradation mechanisms, the strategy enhances resilience and reduces future maintenance requirements. The integration of CFRP strengthening, epoxy crack injection, and advanced waterproofing measures significantly improves corrosion resistance and structural longevity.
Co-Authors Al Houri, Ausamah Al-Sadoon, Zaid A. Alsuwaidi, Hadif Altoubat, Salah Barakat, Samer Elzokra, Ahmed Habib, Maan Junaid, M. Talha Maalej, Mohamed Metawa, Abdulrahman