High performance lightweight concrete - a comparison between actual prestress losses and design code estimates

Authors

  • Mauricio López Pontificia Universidad Católica de Chile. (CHILE)
  • Lawrence F. Kahn Georgia Institute of Technology, (EE.UU)

DOI:

https://doi.org/10.4067/S0718-50732007000100006

Keywords:

Prestress losses, creep, shrinkage, lightweight concrete, high-performance concrete, high-strength concrete, prestressed concrete, code estimates

Abstract

Two different high performance lightweight concretes (HPLC) with strengths of 55 and 69 MPa were developed. They had an air-dry unit weight of 1855 and 1890 kg/m3, respectively. Creep, shrinkage and prestress losses were investigated on 36 cylinder specimens and on four AASHTO Type II girders. Prestress losses measured on the AASHTO Type II girders made with HPLC were less than those predicted using AASHTO, PCI and ACI-209 methods which means that the design codes give conservative estimates of the actual prestress losses of this new concrete. Based on experimental data, final, total prestress losses were estimated to be 14.3 and 9.6 % of the initial prestressing force for the 55-MPa and 69-MPa HPLC, respectively.

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Published

2007-04-30

How to Cite

López, M., & Kahn, L. F. (2007). High performance lightweight concrete - a comparison between actual prestress losses and design code estimates. Revista Ingeniería De Construcción, 22(1), 59–69. https://doi.org/10.4067/S0718-50732007000100006

Issue

Section

Original Research