Abstract: his paper presents an experimental study on cement mortars with different originated pumice aggregates (PA) in order to investigate PA effects on some properties of mortars. Natural sand (NS) was also used to prepare control mortars as reference mix. With this purpose, experiments for aggregate characterisation were conducted and additionally compressive strength, flexural and splitting tensile strength tests were performed on mortars. Results obtained throughout experimental study were analyzed and compared. Replacement of PA with NS led to decreases in mechanical properties of mortars. However, these reductions were differentiated due to the different properties of aggregates. The investigation undertaken also demonstrated the possibility of pumice aggregates in production of structural lightweight mortars.

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-030-9-62
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Abstract: Scour is the formation of scour hole around the structure mounted on and embedded in erodible channel bed due to erosion of soil by flowing water. The formation of scour hole around the structures depends on the depth of flow, shape and size of slender structure, angle of attack of flow and sediment characteristics. The flow characteristics around these structures changes due to manmade obstruction in the natural flow path which changes the kinetic energy of the flow around these structure. Excessive scour affects the stability of the foundation of the structure by the removal of the bed material. The accurate estimation of scour depth around bridge pier is very difficult. The foundation of bridge piers have to be taken deeper and to provide sufficient anchorage length required for stability of the foundation. In the present study, scour depth is estimated around circular piers by HEC-RAS for a straight channel. The flow characteristics around these structures are presented for differe

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-030-9-60
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