International Concrete Abstracts Portal

Title: EFFECT OF FLY ASH, LIMESTONE POWDER AND BOTTOM ASH ON SHRINKAGE CRACKING BEHAVIOR OF CONCRETE

Author(s): Montri Kongsook, Saranorn Hunviboon, Twilight Thong Arunsri, Somnuk Tangsirikul

Publication: TCA

Volume: 4

Issue: 1

Appears on pages(s): 30-39

Keywords: Cracking, Shrinkage, Fly ash, Limestone powder, Bottom ash

DOI:

Date: 1/1/2016

Abstract:
This research was aimed to study the cracking behavior under restrained shrinkage condition of concrete containing fly ash, limestone powder and bottom ash. The bottom ash was used as an internal curing material. The cracking behaviors of concrete that were studied in this research consist of the cracking age of concrete under the uniaxially restrained shrinkage test, free shrinkage, tensile strength and compressive strength of concrete. In this study, the weight percentages of replacement of cement by fly ash were 0, 30 and 50%. For limestone powder, the replacement percentages were 0, 10%. The volume percentages of replacement of fine aggregate by the bottom ash were 10 and 30%. The water to binder ratio of 0.55 was used in this investigation. The results indicated that the use of fly ash could reduce the shrinkage while the shrinkage of limestone powder concrete slightly increased. The use of fly ash and limestone powder increased the cracking age of concrete. Moreover, the cracking age of concrete increases with the increase of fly ash content. The use of bottom ash as internal curing can reduce autogenous shrinkage and can increase cracking age of concrete. The compressive strength reduces with increase of fly ash and bottom ash content.