CREEP AND SHRINKAGE OF HIGH-PERFORMANCE LIGHTWEIGHT CONCRETE

Two high-performance lightweight concrete (HPLC) mixtures with average compressive strengths of 68.5 and 75.4 MPa (9950 and 10,950 psi) were developed. Their air-dry unit weights were 1875 and 1905 kg/cubic m, respectively. 26 creep specimens were loaded at 16 or 24 hrs to 40 or 60% of their initial strength. This preliminary investigation showed that expanded slate HPLC experienced less creep, but slightly more shrinkage than normalweight HPC of similar paste content, mixture proportions, and strength. The 620-day creep coefficients of the 68.5 and 75.4 MPa (9950 and 10,950 psi) HPLC were 1.66 and 1.29, respectively. Creep and shrinkage were compared with estimates from 12 models.