摘要(英) |
Taiwan is located in
the Pacific earthquake region, not only the frequency is very high, but
the weather here hot and humid, changeful the weather, cracks or damage
of concrete members will occur as a result of a number of internal and
external factors in concrete structures, the safety of building deeply
affected by it. In this study, reactive powder concrete(RPC)is used
to investigate the durability of strengthening concrete members. In the
first place, testing for mechanical properties of RPC. Secondly,
evaluate the durability of RPC by accelerating carbonation test and
seawater dry-wet cycle acceleration deterioration test. The test
included compression strength, bending strength, slant shear strength,
splitting tensile strength, pull out strength, ultrasonic wave
propagation velocity measurement, abrasion test, chloride ion
penetration test, carbonated depth measurement, X-ray, and SEM
observation etc. In the last of this thesis, two different materials are
evaluated with their reinforced effect and cost. It is expected that
this studies and tests will be helpful to the strengthening of the
damaged building structures. The test results show that the
mechanical properties of reactive powder concrete possess high strength,
toughness, and abrasion resistance. At the accelerated carbonation test,
no carbonation could be detected on reactive powder concrete samples.
After seawater dry-wet cycle test exposures, there is no influence on
strength and microstructure. The RPC displays excellent durability and
penetration resistance. Using RPC and carbon fiber reinforcement
polymers (CFRP) on strengthening concrete members could be obtain
excellent retrofit effects, but their material costs are extremely
different. |