Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Water Penetration in Solid Clay Brick Masonry and its Mitigation by Repointing
Clay brick masonry façades are widely used because of their extended durability and aesthetic appeal. They also offer good protection against wind-driven rain (WDR), one of the most common moisture sources in Northern Europe. In clay brick masonry, WDR is associated with elevated water content and the possibility of water penetration, which may negatively impact the hygrothermal performance of building envelopes. Maintenance measures are thus recommended to address elevated moisture content and water penetration associated with WDR, where repointing is a commonly used maintenance technique. Presently, in Sweden, repointing is typically scheduled every 40–50 years from the construction of the building, regardless of the condition of the façade. Given that repointing is a labor-intensive and expensive undertaking, there is a pressing need for a systematic approach to evaluating the necessity for repointing based on rational grounds.Within this Ph.D. project, a new laboratory test setup is developed to study water absorption and penetration in clay brick masonry. The key feature is to enable uniform water spray exposure at considerably lower water spray rates than in existing test setups while continuously recording both the amount of absorbed and penetrated water. The developed test setup is used in four experimental campaigns to study the interaction of clay brick masonry exposed to water spray.In the first two experimental campaigns, two series of clay brick masonry specimens without known cracks, built with two different types of bricks and three different mortar joint profiles, are exposed to water spraying. The obtained results indicate that in clay brick masonry without known cracks, water penetration starts when the masonry is nearly saturated (average moisture content above 90% saturation level). As there is a lack of consensus regarding the quantity of WDR penetration through clay brick masonry claddings and the appropriate methodology for incorporating penetration in hygrothermal analyses, a novel water ...
Water Penetration in Solid Clay Brick Masonry and its Mitigation by Repointing
Clay brick masonry façades are widely used because of their extended durability and aesthetic appeal. They also offer good protection against wind-driven rain (WDR), one of the most common moisture sources in Northern Europe. In clay brick masonry, WDR is associated with elevated water content and the possibility of water penetration, which may negatively impact the hygrothermal performance of building envelopes. Maintenance measures are thus recommended to address elevated moisture content and water penetration associated with WDR, where repointing is a commonly used maintenance technique. Presently, in Sweden, repointing is typically scheduled every 40–50 years from the construction of the building, regardless of the condition of the façade. Given that repointing is a labor-intensive and expensive undertaking, there is a pressing need for a systematic approach to evaluating the necessity for repointing based on rational grounds.Within this Ph.D. project, a new laboratory test setup is developed to study water absorption and penetration in clay brick masonry. The key feature is to enable uniform water spray exposure at considerably lower water spray rates than in existing test setups while continuously recording both the amount of absorbed and penetrated water. The developed test setup is used in four experimental campaigns to study the interaction of clay brick masonry exposed to water spray.In the first two experimental campaigns, two series of clay brick masonry specimens without known cracks, built with two different types of bricks and three different mortar joint profiles, are exposed to water spraying. The obtained results indicate that in clay brick masonry without known cracks, water penetration starts when the masonry is nearly saturated (average moisture content above 90% saturation level). As there is a lack of consensus regarding the quantity of WDR penetration through clay brick masonry claddings and the appropriate methodology for incorporating penetration in hygrothermal analyses, a novel water ...
Water Penetration in Solid Clay Brick Masonry and its Mitigation by Repointing
Kahangi, Mohammad (Autor:in)
31.07.2024
Hochschulschrift
Elektronische Ressource
Englisch
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