Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Resistance of Clay Brick Masonry Façades to Wind-Driven Rain : Repointing of Eroded Mortar Joints
Clay brick masonry façades are commonly used due to their high-performance durability. However, exposure to climate agents such as wind-driven rain (WDR), freeze-thaw cycles, and wind abrasion cause deterioration of masonry façades over time. WDR as a significant source of moisture may contribute to the erosion of mortar joints and lead to increased moisture content and risk of water penetration. Accordingly, a maintenance technique, repointing of eroded mortar joints, is recommended as a measure to mitigate moisture/water penetration related to WDR. Repointing is a labor-intensive and costly measure, and there are today no established criteria to determine when repointing is necessary. As such, to enable rational decision-making in maintenance, there is a need for a systematic approach to assessing the need for repointing.Water penetration in masonry exposed to WDR is dependent on a wide range of parameters such as rain intensity, wind velocity, building geometry, the presence of cracks, the profile of mortar joints, the type and quality of masonry units, the compatibility of units and mortar, and the workmanship. There are several experimental methods available through standards and research studies aiming to study water penetration in masonry. Nevertheless, the test conditions, including water spray rate and differential air pressure, of those methods are rather extreme and not representative of actual conditions.In this regard, a new test setup has been developed to study water absorption and penetration in masonry. The key feature is to enable uniform water spray exposure at considerably lower water application rates than in existing standards while continuously recording both the amount of absorbed and penetrated water. Further, the test setup was equipped with a digital camera to record visible dampness, enabling the damp area on the backside of the specimen to be monitored over time. The test setup was used in two experimental campaigns to study the interaction of clay brick masonry and WDR, providing a ...
Resistance of Clay Brick Masonry Façades to Wind-Driven Rain : Repointing of Eroded Mortar Joints
Clay brick masonry façades are commonly used due to their high-performance durability. However, exposure to climate agents such as wind-driven rain (WDR), freeze-thaw cycles, and wind abrasion cause deterioration of masonry façades over time. WDR as a significant source of moisture may contribute to the erosion of mortar joints and lead to increased moisture content and risk of water penetration. Accordingly, a maintenance technique, repointing of eroded mortar joints, is recommended as a measure to mitigate moisture/water penetration related to WDR. Repointing is a labor-intensive and costly measure, and there are today no established criteria to determine when repointing is necessary. As such, to enable rational decision-making in maintenance, there is a need for a systematic approach to assessing the need for repointing.Water penetration in masonry exposed to WDR is dependent on a wide range of parameters such as rain intensity, wind velocity, building geometry, the presence of cracks, the profile of mortar joints, the type and quality of masonry units, the compatibility of units and mortar, and the workmanship. There are several experimental methods available through standards and research studies aiming to study water penetration in masonry. Nevertheless, the test conditions, including water spray rate and differential air pressure, of those methods are rather extreme and not representative of actual conditions.In this regard, a new test setup has been developed to study water absorption and penetration in masonry. The key feature is to enable uniform water spray exposure at considerably lower water application rates than in existing standards while continuously recording both the amount of absorbed and penetrated water. Further, the test setup was equipped with a digital camera to record visible dampness, enabling the damp area on the backside of the specimen to be monitored over time. The test setup was used in two experimental campaigns to study the interaction of clay brick masonry and WDR, providing a ...
Resistance of Clay Brick Masonry Façades to Wind-Driven Rain : Repointing of Eroded Mortar Joints
Kahangi, Mohammad (Autor:in)
01.01.2021
TVBK; (1055) (2021) ; ISSN: 0349-4969
Hochschulschrift
Elektronische Ressource
Englisch
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