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Frost-induced deterioration of concrete in hydraulic structures : Interactions between water absorption, leaching and frost action
Frost deterioration of concrete can result in severe consequences to the safety, durability and functionality of a structure since it impairs the strength of the concrete. Frost damage may occur to structures that are in contact with water and subjected to frost action. Different types of concrete damage, which are suspected to be frost related, have been observed in concrete structures in Swedish hydro power plants. Questions have consequently been raised regarding the durability of concrete in hydraulic structures in cold climates. “Hydraulic structure” is the umbrella term for structures in contact with water – hydro power stations, dams, locks, canals, harbours and bridge piles.Different types of suspected frost related damage to concrete structures in hydro power plants are identified and categorised in this thesis. The underlying causes of damage are experimentally investigated by means of laboratory and field studies. Knowledge about the deterioration of concrete is important in order to secure long service life for hydraulic structures. The obtained results can be used as input for repairs of existing structures and in the case of new builds. The results may also be applicable to hydraulic structures in other countries where similar environmental conditions are present.The environmental exposure conditions of most Swedish hydraulic structures can be considered harsh. Most hydraulic structures are in contact with water all year round and are subjected to frost action in winter. The water in Swedish rivers is generally considered soft due to the geology of Sweden. Ice floes and driftwood may also cause abrasive wear to some structures. Progressive deterioration of the concrete surface occurs at the waterline of many hydraulic structures. Despite the fact that these structures are exposed to fresh water, the damage is similar in appearance to salt scaling of concrete. Surface deterioration results in exposure of the coarse aggregate and eventually the reinforcing steel.Analysis of the chemical composition ...
Frost-induced deterioration of concrete in hydraulic structures : Interactions between water absorption, leaching and frost action
Frost deterioration of concrete can result in severe consequences to the safety, durability and functionality of a structure since it impairs the strength of the concrete. Frost damage may occur to structures that are in contact with water and subjected to frost action. Different types of concrete damage, which are suspected to be frost related, have been observed in concrete structures in Swedish hydro power plants. Questions have consequently been raised regarding the durability of concrete in hydraulic structures in cold climates. “Hydraulic structure” is the umbrella term for structures in contact with water – hydro power stations, dams, locks, canals, harbours and bridge piles.Different types of suspected frost related damage to concrete structures in hydro power plants are identified and categorised in this thesis. The underlying causes of damage are experimentally investigated by means of laboratory and field studies. Knowledge about the deterioration of concrete is important in order to secure long service life for hydraulic structures. The obtained results can be used as input for repairs of existing structures and in the case of new builds. The results may also be applicable to hydraulic structures in other countries where similar environmental conditions are present.The environmental exposure conditions of most Swedish hydraulic structures can be considered harsh. Most hydraulic structures are in contact with water all year round and are subjected to frost action in winter. The water in Swedish rivers is generally considered soft due to the geology of Sweden. Ice floes and driftwood may also cause abrasive wear to some structures. Progressive deterioration of the concrete surface occurs at the waterline of many hydraulic structures. Despite the fact that these structures are exposed to fresh water, the damage is similar in appearance to salt scaling of concrete. Surface deterioration results in exposure of the coarse aggregate and eventually the reinforcing steel.Analysis of the chemical composition ...
Frost-induced deterioration of concrete in hydraulic structures : Interactions between water absorption, leaching and frost action
ROSENQVIST, MARTIN (author)
2016-09-14
Theses
Electronic Resource
English
Engineering and Technology , Vattenbyggnader , Dammar , Betong , Cement , Vattenabsorption , Vattenmättnadsgrad , Nedbrytning , Frostbeständighet , Spjälkning , Makroskopisk islinsbildning , Urlakning , Synergi , Hydraulic structures , Dams , Concrete , Water absorption , Degree of saturation , Deterioration , Frost resistance , Spalling , Macroscopic ice lens growth , Leaching , Synergy
Deterioration of Concrete in Hydraulic Structures due to Frost Action
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| British Library Online Contents | 2017
Mechanism of frost action in concrete
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