To study the mechanical properties of fire-damaged prestressed concrete hollow core slabs before and after strengthened with steel-meshed fine aggregate concrete, 8 specimens were experimentally studied by static load tests, which included 3 reference unexposed specimens without strengthening, 1 unexposed specimen with strengthening, 4 fire-damaged specimens strengthened with steel-meshed fine aggregate concrete and exposed 15,30,45 and 60 min, respectively. The test results showed that all the fire-damaged slabs strengthened with steel-meshed fine aggregate concrete collapsed with a bending failure mode, and their bending stiffnesses were increased. The crack strength and the ultimate flexural strength of the strengthened slabs were all obviously increased, and the ultimate deformation was decreased slightly. The predictions of ulitmate flexural strength of strengthened slabs were in close agreement with the test results after taking the fire damage of material into consideration.
