International Concrete Abstracts Portal

Title: EFFECT OF BOTTOM ASH ON AUTOGENOUS SHRINKAGE OF BINARY BINDER MORTAR

Author(s): Twilight Gold, Arun Srim, Ratanakorn Wiboon, Pongsak Choktaweek, Somnuk Tangpirikul

Publication: TCA

Volume: 3

Issue: 1

Appears on pages(s): 1-8

Keywords: Bottom ash, Fly ash, Lightweight aggregate, Autogenous shrinkage, Binary binder system

DOI:

Date: 1/1/2015

Abstract:
In this study, effect of bottom ash as a partial replacement of fine aggregate on autogenous shrinkage of cement-only and binary binder mortar was investigated. The autogenous shrinkage was studied in mortar with the river sand partially replaced with bottom ash at 0%, 10%, 20% and 30% by volume. Two types of bottom ash having low water retainability (18.8%) and high water retainability (29.6%) were used in this study. The influence of types of cement (Type I, III and V) on autogenous shrinkage of mortar with bottom ash was investigated. The control mixture included only Ordinary Portland Cement (OPC) while the binary mixtures were prepared by blending the OPC with fly ash. The weight percentage of replacement of cement by fly ash was 30%. The results indicated that the use of bottom ash could reduce autogenous shrinkage of mortar. The autogenous shrinkage decreased with the increase of bottom ash content. The high water retainability bottom ash was more effective to reduce autogenous shrinkage than that of the low water retainability bottom ash. These phenomena had also been found in the binary binder system. The use of bottom ash in fly ash-cement mortar also reduced autogenous shrinkage.