Effect of Bio-Fuel Ash with Different Grinding Periods on Properties of Self-Compacting Concrete

Abstract

This research paper presents the effect of grinding period of ground bio-fuel ash (GBFA) on self-compacting ability and compressive strength of self-compacting concrete (SCC). The bio-fuel ash used in this study was divided into three categories, according to their grinding times: 1) GBFA1 with 1-hour grinding, 2) GBFA2 with 2-hour grinding, and 3) GBFA3 containing 50:50 weight ratio of GBFA1 and GBFA2. Test results showed that GBFA1 and GBFA2 possessed pozzolanic properties, complying with ASTM C618. They were then used to replace Portland cement with the replacement ratios of 10 20 and 30 %wt, to produce SCC. It was found that the slump flow diameter and L-box index decreased, while 50t flow time increased as the replacement ratios of the ashes increased. The use of GBFA2 with 2-hour grinding in SCC resulted in higher slump flow diameter, as compared to GBFA1 and GBFA3. It was also revealed that the SCC containing GBFA2 exhibited higher compressive strength than that with GBFA1, owing to its better filler effect and pozzolanic effect.