Repair of Deteriorated Reinforced Concrete Slabs

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Title: Repair of Deteriorated Reinforced Concrete Slabs

Author(s): T. Yamamoto

Publication: Special Publication

Volume: 193

Issue:

Appears on pages(s): 151-162

Keywords: concrete; deflection; reinforced; repair; slab; vibration

Date: 8/1/2000

Abstract:
A laboratory test and a case history of deteriorated reinforced concrete slab repair are presented. Since several structural problems have been reported for reinforced concrete slabs, it is necessary to establish repair techniques for such slabs. Many structural problems of reinforced concrete slabs derive from a decline in rigidity with age. Although several techniques have been developed, their effectiveness has not been ascertained, especially over the long term. A laboratory test was conducted to ascertain the effectiveness of repair techniques. Based on the test results, the overlay repair technique was applied to actual slabs. In the case history, short and long-term performances of the repaired slabs were measured for more than 2000 days. Changes in the rigidity and natural frequency of the slabs were examined. The material properties and adhesive strength of old and new concrete were also examined. Although the static and dynamic performances of the repaired slabs improved remarkably, their performances gradually decreased with age. It is important to allow a reasonable margin of error for repairing deteriorated slabs.