Strength, abrasion resistance and permeability of artificial fly-ash aggregate pervious concrete

Abstract

The objective of this study is to utilize artificial cold bonded fly ash aggregate (AFA) in pervious concrete to produce a sustainable, and permeable concrete. The AFA were manufactured through cold bonding pelletization of fly ash (90 %) and Portland cement (10 %) in an inclined pan at ambient temperature. In this study, pervious concrete is manufactured by replacing the natural aggregates (NA) with AFA in five levels of replacements 0–100% with 25 % increments of the total aggregate’s volume. Two different concrete series were manufactured at 0.27 and 0.32 water-to-cement ratios (w/c). Totally, 10 pervious concretes were manufactured in this study. The utilized NA and AFA were uniformly graded and ranged 12.5 mm to 8 mm. In this study, the dry density and content of voids were determined. Furthermore, for the produced pervious concretes some tests were conducted such as compressive strength, splitting tensile, permeability and abrasion resistance. Besides, GLM-ANOVA as a statistical tool was employed to examine the effective parameter(s) on the properties of pervious concrete made using AFA. The results showed that with replacing the natural aggregate with 100 % AFA, the dry density of pervious concretes has decreased up to 22.4 % and the content of void and abrasion value has increased up to 20.8 %, and 153.8 %, respectively, for 0.27 w/c. In addition, the full replacement of NA with AFA resulted in a decrease of 51.5 % and 57.2 % in compressive strength and splitting tensile values made with w/c of 0.27. While, utilizing AFA significantly enhanced the permeability coefficient of the pervious concrete reaching maximum value of 10.27 mm/sec at w/c of 0.32.