Browsing by Author "Al-Haddad, Diala Basim"

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    Durability Design Approach and Exposure Conditions in Eurocode, British Standard and ISO 13823 Standards: A Review
    (SpringerLink, 2024) Al-Haddad, Diala Basim; Jokhio, Gul Ahmed
    Several incidents of early deterioration of reinforced concrete structures have been reported in recent years. Consequently, the critical demand to incorporate durability in the structural design and construction approach has emerged. As a result, durability design provisions in many countries’ standards have gotten increasingly stringent. In the absence of clear standard guidelines for design engineers, insufficient design and failures or an expensive over-design to provide for the worst-case scenario may occur. This paper compares and critically reviews the durability design requirements and provisions in the Eurocode, British standards, and ISO standards and proposes improvements that will contribute to the development of the coming generation of these documents. The review revealed similarities in the durability design approach, exposure conditions, and design requirements in the Eurocode code and British standard, whereas the ISO 13823 approach is different. The studied documents’ durability provisions are comprehensive, detailed, and well-defined. Nevertheless, several provisions require to be revised to avoid misinterpretation by the code practitioners and to ensure an economically conservative durable design.
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    Overview of Concrete Deterioration Due to Sulphate Attack and Comparison of Its Requirements in International Codes
    (Springer Link, 2023) Al-Haddad, Diala Basim; Jokhio, Gul Ahmed; Abu Tair, Abid
    Any material or geometric property change that has an impact on structural performance is known as structural deterioration. Although this phenomenon is gradual, if it is not evaluated and fixed in a timely manner, it will have a severe impact on the structure and, in some historical occasions, may result in collapse. Deterioration has a variety of causes and mechanisms. Some are regarded as external, such as the environment, which is critical in areas with tough climate conditions, as the Arab Gulf, where temperatures and humidity are high, another factor is the low quality of the materials and poor craftsmanship. Depending on the type of materials used in the structure and the environment in which it is created, several precaution approaches for structural degradation may be adapted. Sulphate attack is one of the most widespread deteriorating mechanisms; this type of chemical damage can result in cracks, spalling, and disintegration of the structure, diminishing its strength. This paper presents a thorough investigation of this degrading agent, including its causes, effects, international code provisions, as well as recent studies on the subject with a focus on the Arab Gulf Countries. The outcomes of this study demonstrated that this phenomenon, with its various mechanisms, has a negative impact on structures. Despite the distribution of sulphates in the Gulf, the existence of chloride and the precautionary measures taken successfully limited their impact on structures.