Development and Experimental Use of a 90 MPa (13,000 psi) Field Concrete

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Development and Experimental Use of a 90 MPa (13,000 psi) Field Concrete

Author(s): Pierre-Claude Aitcin, Pierre Laplante, and Claude Bedard

Publication: Special Publication

Volume: 87

Issue:

Appears on pages(s): 51-70

Keywords: columns (supports); field tests; flexuralstrength; high-strength concretes; modulus of elasticity; plasticizers; porosity; retardants; shrinkage; silica; temperature; thermal -- gradient.

Date: 9/1/1985

Abstract:
Test results of a field experiment are presented where a 90 MPa (13 000 psi) silica fume concrete was used in the construction of an experimental column of a 26-storey highrise building. This concrete used a set-retarding agent in addition to a superplasticizer, had a water/cementitious ratio of 0.25 and was delivered at a slump of 250 mm (10 inches) after 45 minutes of travel. Maximum temperature was reached about 30 hours after mixing and was about 45°C (113°F) higher than the initial temperature of the fresh concrete. The thermal gradient inside the column was never greater than 20"C/m (21"F/ft) and no thermal stress problems were noted. Expressions of the modulus of rupture and modulus of elasticity, as a function of the compressive strength, are proposed. The 91 days shrinkage of this very high strength silica fume concrete was similar to that of plain concrete having a W/C of 0.40. In one concrete batch, due to a superplasticizer overdosage that resulted in an 18-hour set retardation, entrapped air macropores of 1.0 um size were created and caused a 10 MPa (1 450 psi) strength reduction at 91 days.