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- W10173204 abstract "Water ingress, usually by wind-driven rain, is the main cause of prematuredeterioration in masonry structures. Water acts as a transport mechanism foraggressive chemicals and can also undergo freeze/thaw cycles leading to bursting ofthe masonry microstructure.Factors such as the absorption rates of brick, water/cement ratio of the mortar,workmanship of the mason and poor design detail have all been identified asinfluencing the amount of water likely to penetrate a structure. It is also recognizedthat the majority of water ingress occurs at the brick unit/mortar joint interface,where interstices are present that allow access to the masonry interior.The size, extent and influence that the brick/mortar interface has in governing wateringress is likely to be controlled by both the applied stress level and bed orientationof the main mortar beds relative to the direction of loading. Very little research hasinvestigated these parameters in detail.By using a new ingress measurement technique, the effect of the applied stress leveland bed orientation was quantified. The main mortar beds of concentrically loadedmasonry panels were found to deteriorate in their resistance to water ingress as theywere orientated from perpendicular to parallel relative to the direction of loading.Poisson's ratio effects, which generated differential expansion between brick andmortar were believed to control water ingress at mortarjoints orthogonal to the mainbeds. Water ingress at these mortarjoints was also found greatly influenced by bothapplied stress level and bed orientation.Factors such as the applied pressure head of water impinging onto the panel, thevariability of the brick type used, eccentricity of applied loads and the pre-wetting ofpanels were also found to have some controlling influence on the water ingresscharacteristics of masonry.Empirical modelling of water ingress dependent upon time, stress level, bedorientation and pressure head of water, was also undertaken. This enabled thevolume of water ingress to be mathematically generated, with these modelsexhibiting good agreement with experimental data.Suggestions for future work include assessing the effect of higher applied stresslevels on water ingress, verification of the laboratory work with on-site tests and theintroduction of freeze/thaw testing on loaded panels to simulate an abrasive externalenvironment. Numerical analysis using finite element modelling was also identified." @default.
- W10173204 created "2016-06-24" @default.
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- W10173204 date "1999-05-01" @default.
- W10173204 modified "2023-09-26" @default.
- W10173204 title "The water ingress characteristics of stressed masonry." @default.
- W10173204 hasPublicationYear "1999" @default.
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