PROPERTIES OF HIGH-CALCIUM DRY BOTTOM ASH CONCRETE

Abstract

A study of various fresh and hardened properties of bottom ash concrete is reported. Standardized tests were conducted on four series of concrete mixtures having a constant volume of solid constituents and a uniform slump of 101.6 +/- 1/4 mm. Series A and B were mixes of natural sand (control mix) and bottom ash concretes, respectively. Series C contained mixes in which the fine aggregate component of the matrix consisted of equal volumes of natural sand and bottom ash. The mixes of Series D incorporated a high range of water-reducing admixture into the mixtures of Series C. The test results indicated that the mixing water requirement increases rapidly when bottom ash is used in concrete. When 50% of the total dry volume of the natural fine aggregate was replaced by bottom ash or a high-range water reducing admixture was used in conjunction with the combined bottom ash and natural sand mixtures, the engineering characteristics were similar and in most cases superior to those of reference mixes.