CREEP PREDICTION OF SELF-CONSOLIDATING CONCRETE INCORPORATING CLASS-F FLY ASH

Adam, I.; Taha, M. M. Reda

doi:10.21608/iccae.2012.44223

CREEP PREDICTION OF SELF-CONSOLIDATING CONCRETE INCORPORATING CLASS-F FLY ASH

Document Type : Original Article

Authors

I. Adam ¹
M. M. Reda Taha ²

¹ Associate Professor, Construction Research Institute, National Water Research Center, Delta Barrage, Egypt.

² Associate Professor & Regents’ Lecturer, Dept. of Civil Engineering, Univ. of New Mexico, Albuquerque, NM, USA.

10.21608/iccae.2012.44223

Abstract

ABSTRACT Self-consolidating concrete (SCC) is a relatively new type of concrete with a number of attractive properties, particularly in its fresh state. In spite of the extensive research studies carried out on SCC in the last two decades, its time-dependent behavior including creep and shrinkage has not received ample attention. This paper presents the results of an experimental investigation aiming to identify creep (under compressive stresses) of SCC containing class-F fly ash. In this work three different SCC mixes were prepared to investigate the effect of changing levels of fly ash on creep of SCC. The adopted fly ash contents were 20%, 40%, and 60%, by mass, of the total binder materials content (cement plus fly ash). The water/binder ratios of the SCC mixes were kept constant at 0.33 and the total binder content was kept at fixed value of 450 kg/m3. Experimental results were compared with the popular ACI and CEB-FIP prediction models for creep in concrete in order to compare the creep of SCC mixes to that of Normally-Vibrated Concrete (NVC). Due to the ACI model’s dependence on knowing the slump of the concrete, the authors propose a change in the model. The comparison of experimental results with the CEB-FIP models suggests that creep compliance of SCC mixes containing fly ash is significantly higher than that of NVC.

Keywords