Paper by MINGUELA from ISCR 11th 2010 Seville Spain
A continuously reinforced concrete pavement (CRCP) was opened to traffic in 1976 in the North of Spain. It is located in a 43 km long motorway. Each carriageway is 12,00 m wide (concrete pavement is 8.00 m wide). The top layer is a 22 cm thick CRCP. Longitudinal reinforcement consists of steel bars (Ø18 mm), 14 cm apart. In spite of the heavy traffic, only a few distresses have appeared in the pavement. To repair broken slabs and punch-outs, three different types of fast-track concrete have been used. Traffic is allowed once compressive strength exceeds 15 MPa. Two types are produced in a ready-mix concrete plant, one of them with CEM I 52,2N cement and the other one with CEM III/A 42,5N SR cement. The specified strength is obtained within 6 to 24 hours. The third type is a pre-batched concrete, supplied in bags and mainly intended for small size repairs. It is mixed with water on site, traffic being allowed after 3 hours.