PROPERTIES OF AUTOCLAVED CELLULAR CONCRETE WITH HIGH-VOLUME FLY-ASH

This paper presents the results of an investigation on the strength pr operties of autoclaved cellular concrete (ACC) blocks, a building mate rial that can contain up to 70% w/w of electric utility fly ash. The s cope of this investigation covers three phases: (1) a brief literature review; (2) a selection of optimum strength testing methods suitable for ACC materials; and (3) a determination of physical properties of A CC made with U.S. electric utility fly ash, and comparison of such pro perties to European ACC materials made with sand as the silica source. Optimum laboratory testing methods were selected based on a comprehen sive literature search that included American, European, and Chinese s tandards. The properties examined were compressive, tensile, and flexu ral strengths. Results showed that block recipe and density influence the compressive, tensile, and flexural strength values. The investigat ion indicated that the compressive strength of the blocks increases wi th dry weight density, and decreases as their moisture content increas es.