| Summary: | 碩士 === 國立台灣工業技術學院 === 營建工程技術研究所 === 85 === Study on the Engineering Properties of Underwater Eugenic
Concrete Abstract The mixture design of the traditional
underwater concrete is to meet the requirement of the safety and
the workability. However, it appears some engineering problems
such as disintegrate wall, pipe stuffing, honeycomb and
segregation on the concrete structure. In order to resolve the
above defects, the mixture proportioning of eugenic concrete is
used based on the ideas of pathology and the concept of dense
packing, to design such underwater concrete to meet the actual
needs. In this research, the fresh and hardened properties of
EUC (underwater eugenic concrete) and TUC (traditional
underwater concrete) are studied. The tests include rheology,
heat of hydration, compressive strength, ultrasonic pulse
velocity, electrical resistivity, permeability, core strength,
shrinkage and mold pressure. The result indicates that under
sufficient paste and viscosity and at same W/B (0.48), EUC has
higher initial shearing force and lower heat of hydration, and
low workability loss. The self-leveling EUC can fill model
without vibration and has higher lateral stress than the
traditional concrete. About the hardened property, EUC has
better strength, and shows higher electrical resistivity and
lower chloride penetration than traditional concrete. This
means it has better durability. To sum up, EUC developed in
this research has better workability and hardened properties
than the traditional concrete. This will be helpful to improve
the problems caused by the concrete in water to reach the aim of
better quality.
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