Coal bottom ash blended with fly ash and portland cement as a technological product in road paving

This study evaluated the mechanical behavior of 16 blends with the use of coal bottom ash and varied proportions of fly ash and composite Portland cement. Assays of mechanical characterization in bottom ash and blends with Proctor assays, Resistance to Simple Compressive with 7, 14, 28, 84 days curing time and California Bearing Ratio were applied. The main results of this study indicated that the bottom ash is a material of group A-4 in the TRB classification; the blend composed of 87% bottom ash, 5% fly ash, 8% cement is the ideal blend, with RSC7 of 2.29 MPa, suitable for base and sub-base of highways, according to Brazilian standard DNIT 143/2010-ES; the blends with cement ratio below 8% do not comply with the Brazilian standard for a minimum strength of 2.1 MPa; the bottom ash presented a better support capacity than some soils. © 2019 Widener University School of Civil Engineering. All rights reserved.