Creep and Shrinkage of High-Performance Lightweight Concrete

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Title: Creep and Shrinkage of High-Performance Lightweight Concrete

Author(s): Mauricio Lopez, Lawrence F. Kahn, and Kimberly E. Kurtis

Publication: Materials Journal

Volume: 101

Issue: 5

Appears on pages(s): 391-399

Keywords: creep; high-performance concrete; high-strength concrete; lightweight concrete; modeling; prestressed concrete; shrinkage

Date: 9/1/2004

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 me, respectively. Creep and shrinkage were compared with estimates from 12 models.