Development of Very Low Density Structural Lightweight Concrete


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Title: Development of Very Low Density Structural Lightweight Concrete

Author(s): M. A. Caldarone and R. G. Burg

Publication: Special Publication

Volume: 218


Appears on pages(s): 177-188

Keywords: coal cinder aggregate; compressive strength; equilibrium density; lightweight aggregate; lightweight concrete; oven-dry density; rehabilitation; structural evaluation

Date: 2/1/2004

Structural lightweight concrete is defined as concrete made with low-density aggregate having an air-dry density of not more than 115 lb/ft3 (1850 kg/m') and a 28-day compressive strength of more than 2500 psi (17.2 MPa). This paper presents the test results of very low-density structural lightweight concrete mixtures developed in the laboratory for the purpose of finding a suitable mixture for use on a historic building rehabilitation project. Mixture parameters included a specified compressive strength of 3000 psi at 28 days and an air-dry density approaching 70 lb/ft3. Various constituent materials, mixture proportions and curing methods were examined. The result of this research exemplifies the feasibility of achieving very low densities with structural concretes.