LABORATORY-MADE ROLLER COMPACTED CONCRETES CONTAINING DRY BOTTOM ASH - PART II - LONG-TERM DURABILITY

Laboratory-made roller compacted concretes with various combination of cement (Type I and Type V for sulfate-resistant concrete), lignite dr y bottom ash, and crushed limestone coarse aggregate wt ere rested to ascertain the suitability of this type of concrete for pavement applic ations. The fresh properties and strength a,ld deformation of the hard ened roller compacted concrete (RCC) containing bottom ash have been d iscussed in the companion article (Part I). This paper describes the d ata pertaining to long-term durability of bottom ash roller compacted concretes. The analysis of the test results leads to the conclusions t hat durable concrete can be produced with the high-calcium dry bottom ash used in this investigation. Resistance to sulfate attack, rapid fr eezing and thawing, and wear improved with increases in cement and/or coarse aggregate contents. Length change due to external sulfate attac k varied from 0.0203 to 0.0388 percent, whereas no mass loss or reduct ion in strength were found in any of the test samples. Abrasion testin g under wet conditions,vas consistently worse than under dry condition s. After 300 rapid freezing and thawing cycles, the mixture proportion s of this investigation displayed a maximum mass loss of 2.3 percent a nd a,minimum durability factor of 91.2 percent.