Abstract

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/m3 (117 and 119 lb/ft3), respectively. Twenty-six creep specimens were loaded at 16 or 24 h 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 high-performance concrete 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. The 620-day shrinkage of the 68.5 and 75.4 MPa (9950 and 10,950 psi) HPLC were 820 and 610 ??, respectively. Creep and shrinkage were compared with estimates from 12 models.