Creep Behaviour of Fly Ash-Based Geopolymer Concrete

Creep Behaviour of Fly Ash-Based Geopolymer Concrete

Abstract:  Fly  ash-based  geopolymer  concrete  is  manufactured  using  fly  ash  as  its  source material and does not use Portland cement at all. Beside fly ash, alkaline solution is also utilized to make geopolymer paste which binds the aggregates to form geopolymer concrete. This paper presents  the  study  of  creep  behaviour  of  fly  ash-based  geopolymer  concrete.  Four  series  of  specimens with various compressive strengths were prepared to study its creep behaviour for the    duration of test up to one year. The test method followed the procedures applied for Ordinary Portland  Cement  (OPC)  concrete.  Test  results  show  that  fly  ash-based  geopolymer  concrete undergoes low creep which is generally less than that of OPC concrete. After one year of loading,  the results for specific creep of fly ash-based geopolymer concrete in this study ranges from 15 to  29 microstrain for concrete compressive strength 67–40 MPa respectively. From the test results,  it is also found out that the creep coefficient of fly ash-based geopolymer concrete is about half of  that predicted using Gilbert’s Method for OPC concrete. 

Keywords: creep, fly ash, geopolymer concrete.