This Symposium Publication contains 14 papers that were presented at technical sessions sponsored by ACI Committees 544 and 549, and Joint ACI-ASCE Committee 423 at the 2008 ACI Spring Convention in Los Angeles, CA. Topics covered in these papers include development, mechanical behavior, modeling and structural applications of fiber- reinforced concrete and thin laminate composites; repair and rehabilitation of reinforced and prestressed concrete members; and new developments in prestressed concrete bridges.