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Application of expansive agent in Nanchang Red Velley
Author(s): 
Pages: 61-62+72
Year: Issue:  9
Journal: Ready-mixed Concrete

Keyword:  expansive agentshrinkage compensating concreteimmersed tube methodpost-pouring joint;
Abstract: Immersed tube method is adopted for construction of Red valley tunnel. Immersed tube is reinforced concrete structure, and post-pouring joint uses shrinkage compensating concrete. CC-12 expansive agent is selected to make shrinkage compensating concrete with restrained expansion rate ≥0.025%. Casual inspection on expansive agent at fixed period, prolonging mixing time, placement layer by layer, and strengthening vibration and curing, thus the concrete density is secured. Efficient expansion is established in immersed tube junction, so that the waterproof effect is improved.
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