On the Durability and Strength of Compacted Coal Fly Ash-Carbide Lime Blends

N.C. Consoli, R.B. Saldanha, J.F. Novaes, H.C. Scheuermann Filho

Article

Soils and Rocks, São Paulo, 40(2): 155-161, May-August, 2017 | PDF


Abstract

Present investigation intends to examine the mechanical behaviour of compacted coal fly ash – carbide lime mixes to assess their potential use as a sub-base/base material for low volume roads. This study plans to compute the impact of carbide lime content and dry density on the properties (durability and strength) of compacted coal fly ash -carbide lime blends. Its main significant addition to knowledge is quantifying the accumulated loss of mass (ALM) after wetting/drying cycles, tensile (qt) and compressive strength (qu) as a function of the porosity/lime index. A specific qt/qu matching 0.13 was established, being autonomous of the porosity/lime index. In addition, it is empirically revealed the existence of an exclusive relation connecting accumulated loss of mass divided by the number of wetting/drying cycles and porosity/lime index. This broadens the applicability of such index by demonstrating it controls endurance performance of compacted coal fly ash – lime blends.


Submitted on January 13, 2017; Final Acceptance on July 5, 2017; Discussion open until December 29, 2017. DOI: 10.28927/SR.402155