INVESTIGATION OF THE EFFECT OF THE PRE-REST PERIOD AND MICROWAVE CURING ON THE MECHANICAL PROPERTIES OF GEOPOLYMER MORTAR SPECIMENS


Durak U.

IV. INTERNATIONAL ANKARA CONFERENCE ON SCIENTIFIC RESEARCH, Ankara, Türkiye, 10 - 11 Nisan 2021, cilt.1, sa.1, ss.186-194

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 1
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.186-194

Özet

In this study, the strength development of geopolymer mortar specimens subjected to the prerest period was investigated under the effect of microwave (MW) curing. In the study, in the 

production  of  geopolymer  mortar  samples,  NaOH  as  an activator  and  F  class  fly  ash  as  a 

binder were used and prismatic samples of 40x40x160mm were produced. The sand-binder 

ratio was determined as 3 and the water-binder ratio was 0.35 in the samples produced. CEN 

standard sand was used in the preparation of the mixtures. After the samples were placed in 

molds, they were kept in room conditions for 0, 1, 2, 3, 7, 14, and 28 days. The samples that 

completed the pre-rest period were firstly heat cured at 75⁰C for 6 hours. After heat curing, 

microwave cure was applied to geopolymer mortar samples at 180 W (Watt) for 60 minutes. 

After  curing,  the  unit  weight,  ultrasonic  pulse  velocities,  the  flexural,  and  compressive 

strength of the samples were determined. According  to  the  results  obtained,  the  flexural  and compressive  strengths  of  the  samples 

subjected to the pre-rest period were increased. The flexural strength of the samples, which 

were subjected to heat curing at 75⁰C for 6 hours after the pre-rest period, was obtained as a 

maximum of 2.15 MPa, and compressive strength was determined as 12.50 MPa. On the other 

hand,  flexural  strengths  up  to  5.16  MPa  and  compressive  strengths  up  to  25.3  MPa  were 

determined  in  samples  subjected  to  microwave  curing after  heat  curing.  In  general,  an 

increase in the strengths obtained after heat curing and microwave curing was observed with 

the increase in the pre-rest period. The results ofthe study showed that a much higher and 

faster strength gain can be achieved by pre-rest and microwave curing in geopolymer mortar 

samples.