Research of shrinkage compensating concrete in wet joint construction of bridge deck in winter
In order to solve the problems of shrinkage,creep,heat loss and temperature control in wet joint concrete construction of steel-concrete composite bridge in winter,the high strength and early strength compensated shrinkage concrete was designed,the construction technology was studied by taking measures such as temperature control of raw materials,concrete during transportation,pouring process and curing process after pouring.The results show that expansion agent was 10%and early strength agent was 1.5%,the limited expansion rate reached 3.6×10-4 after curing in water for 7 d and 1.5×10-4 curing in curing room for 28 d,1 d strength was 55%of 28 d,28 d strength was 71.9 MPa.The early strength of concrete was high,early shrinkage of concrete can be well compensated.Temperature control measures included heating the materials,heat insulation during transportation and casting of concrete were preserved,the flange plate was insulated and heated by polystyrene plate and electrothermal film,the hydration process of concrete can be effectively promoted by covered with film,heated with electric heating plate,insulated with cotton quilt and double-layer tarpaulin.
high strength shrinkage compensating concretewinter constructionwet joint constructiontemperature control
万方数据
维普
