Study on properties of C50 concretes with match curing based on entity temperature of mass concrete for bridge cable tower
In order to explore the development law of the actual performance of concrete for the bridge cable tower structure,the core temperature of C50 mass concrete construction of the cable tower of a Yangtze River highway bridge was used as the matching curing temperature of concrete.The effects of standard curing and temperature matching curing on the strength development law,resistance to chloride ion permeability and microstructure of hydration products of three kinds of C50 concrete specimens of pure cement,addition of 20%fly ash(FA),mixed with 20%FA and 15%ground granular blast furnace slag(GGBS)were compared and studied.The results show that the high hydration temperature under the temperature matching curing significantly stimulates the hydration activity of the composite cementitious material mixed with FA and GGBS.The 3 d compressive strength and flexural strength of the concrete mixed with FA and GGBS under temperature matching curing condition are increased by more than 45%and 30%respectively than those under standard curing condition.Temperature matching curing inhibits the later strength development of pure cement concrete,increases its brittleness and reduces its resistance to chloride ion permeability,and the above adverse effects can be improved or eliminated by addition of FA or mixed FA and GGBS.Whether under standard curing or temperature matching curing,the concrete mixed with FA and GGBS has the highest strength,the maximum ratio of folding pressure and the best resistance to chloride ion penetration,which is suitable for the construction of mass concrete structure of cable tower.
curing temperaturecable towermineral admixturestrengthresistance to chloride ion penetrationhydration
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