TY - JOUR
T1 - High tensile strength fly ash based geopolymer composite using copper coated micro steel fiber
AU - Ranjbar, Navid
AU - Mehrali, Mehdi
AU - Mehrali, Mohammad
AU - Alengaram, U. Johnson
AU - Jumaat, Mohd Zamin
PY - 2016/6/1
Y1 - 2016/6/1
N2 - As a ceramic-like material, geopolymers show a high quasi-brittle behavior and relatively low fracture energy. To overcome this, the addition of fibers to a brittle matrix is a well-known method to improve the flexural strength. Moreover, the success of the reinforcements is dependent on the fiber-matrix interaction. In this present study, effects of micro steel fibers (MSF) incorporation on mechanical properties of fly ash based geopolymer was investigated at different volume ratio of matrix. Various properties of the composite were compared in terms of fresh state by flow measurement and hardened state by variation of shrinkage over time to assess performance of the composites subjected to flexural and compressive load. The fiber-matrix interface, fiber surface and toughening mechanisms were assessed using field emission scan electron microscopy (FESEM) and atomic force microscopy (AFM) through a period of 56 days. Test results confirmed that MSF additions could significantly improve both ultimate flexural capacity and ductility of fly ash based geopolymer, especially at early ages without an adverse effect on ultimate compressive strength.
AB - As a ceramic-like material, geopolymers show a high quasi-brittle behavior and relatively low fracture energy. To overcome this, the addition of fibers to a brittle matrix is a well-known method to improve the flexural strength. Moreover, the success of the reinforcements is dependent on the fiber-matrix interaction. In this present study, effects of micro steel fibers (MSF) incorporation on mechanical properties of fly ash based geopolymer was investigated at different volume ratio of matrix. Various properties of the composite were compared in terms of fresh state by flow measurement and hardened state by variation of shrinkage over time to assess performance of the composites subjected to flexural and compressive load. The fiber-matrix interface, fiber surface and toughening mechanisms were assessed using field emission scan electron microscopy (FESEM) and atomic force microscopy (AFM) through a period of 56 days. Test results confirmed that MSF additions could significantly improve both ultimate flexural capacity and ductility of fly ash based geopolymer, especially at early ages without an adverse effect on ultimate compressive strength.
KW - Fiber/matrix bond
KW - Fly ash
KW - Geopolymer
KW - Mechanical properties
KW - Steel fiber
KW - Strength
UR - http://www.scopus.com/inward/record.url?scp=84960172361&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2016.02.228
DO - 10.1016/j.conbuildmat.2016.02.228
M3 - Article
AN - SCOPUS:84960172361
SN - 0950-0618
VL - 112
SP - 629
EP - 638
JO - Construction and building materials
JF - Construction and building materials
ER -