Compressive strength, water absorption, sorptivity, abrasion resistance and permeability of self-compacting concrete containing coal bottom ash

Abstract

An experimental program was carried out to study the properties of self-compacting concrete (SCC) made with coal bottom ash. The mixes were prepared with three percentages (0, 10, 20 and 30) of coal bottom ash as partial replacement of fine aggregates. Properties investigated were; slump flow, J-ring, V-funnel, L-box and U-box, compressive strength, abrasion resistance, rapid chloride permeability, water absorption, and sorptivity. Tests for compressive strength, abrasion resistance, chloride permeability were conducted up to the age of 365days whereas water absorption and sorptivity tests were conducted up to the age of 28days.Test results indicated that SCC mixes developed 28-day compressive strength between 25.8 and 35.2MPa. SCC mixes made with bottom ash exhibited very low chloride permeability resistance (between 381 and 800C) at the age of 90 and 365days respectively. Abrasion resistance, water absorption and sorptivity of SCC mixes increased with the increase in bottom ash content at a particular age, however, it decreased with increase in age.