THESIS
2017
x, 122 pages : illustrations ; 30 cm
Abstract
After years of service, many concrete buildings are facing the problem of deterioration. In
aging buildings, steel corrosion is one of the major problems causing spalling of concrete
cover and loss of strength in the structural members. Traditionally, if the loss in steel area is
small, the spalling will be simply repaired by patching. If the loss in steel area is high, the
structural members will be simply repaired by attaching external steel plate with anchors or
lapping a new reinforcement to recover the load carrying capacity. However, these methods
are labour-intensive, costly and time-consuming. In this thesis, an effective and innovative
repair method is developed. A repair mortar of sufficient tensile strength will be developed
by adding steel fiber into the mortar. Diff...[
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After years of service, many concrete buildings are facing the problem of deterioration. In
aging buildings, steel corrosion is one of the major problems causing spalling of concrete
cover and loss of strength in the structural members. Traditionally, if the loss in steel area is
small, the spalling will be simply repaired by patching. If the loss in steel area is high, the
structural members will be simply repaired by attaching external steel plate with anchors or
lapping a new reinforcement to recover the load carrying capacity. However, these methods
are labour-intensive, costly and time-consuming. In this thesis, an effective and innovative
repair method is developed. A repair mortar of sufficient tensile strength will be developed
by adding steel fiber into the mortar. Different types of mortar and steel fiber are
investigated in terms of mix composition and fiber geometry. Tests are first performed to
measure the direct tensile behavior of the fiber reinforced mortar. After identifying mixes
with sufficient tensile capacity to compensate for the loss in steel area encountered under
practical conditions, bond tests are carried out to study the required bond length of repair
mortar patch along the steel reinforcement. The results of this study demonstrate the
promise of a new cost-effective approach for the repair of reinforced concrete buildings.
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