Creep and shrinkage of lightweight self-consolidating concrete for prestressed members

Creep, shrinkage, and prestress losses were measured for lightweight (LWSCC) and normalweight self-consolidating concrete (SCC). A slight expansion was observed for LWSCC at early ages (less than 24 h), but a 100-300 microstrain larger total shrinkage compared to SCC was measured at one year of age for measurements beginning at one day in all environmental conditions. Greater total creep, but a smaller creep coefficient was observed for LWSCC compared to SCC. The creep coefficients at one year for specimens loaded at one day were 2.0 for LWSCC and 2.9 for SCC. Experimentally measured creep, shrinkage, and prestress losses were compared to ACI and AASHTO provisions to assess the suitability of the current provisions for LWSCC.