INVESTIGATION OF MECHANICAL AND MICROSCOPIC PROPERTIES OF RECYCLED CONCRETE BASED ON GEOPOLYMER POWDER CONTAINING LIME AND METAKAOLIN


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Kaplan G., Çelebi O., Öz A., Bayrak B., Alcan H. G., Aydın A. C.

6th International Conference on Computational Mathematics and Engineering Sciences / 20-22 May. 2022, Ordu – Turkey, Ordu, Türkiye, 20 Mayıs - 22 Haziran 2022, cilt.1, sa.1, ss.10-21

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 1
  • Basıldığı Şehir: Ordu
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.10-21
  • Atatürk Üniversitesi Adresli: Evet

Özet

Mechanical and micro analyzes were carried out on the recycled concrete samples obtained by preparing different mixtures of geopolymer powder, metakaolin, lime, quartz and sodium silicate as alkali activator and sodium hydroxide solution, which were formed by grinding the geopolymer concrete samples prepared with certain temperature and low curing times. Recycled concrete samples with geopolymer powder, with a weight ratio of 36% in 1m3 volume, were prepared at 60 for 6-8-10 hours of curing. The test results showed that the highest compressive strength of the mixtures was 77.89 MPa with the increase of the lime ratio in the 8 hour curing period. It was determined that the highest compressive strength was 73 MPa in the samples in which metakaolin was never used and the lime ratio was maximum, the compressive strengths of the samples with 0.05% lime ratio of metakaolin and 0.025% lime ratio of metakaolin and 0.05% lime ratio of metakaolin were 74 and 77.89 MPa, respectively. In addition, capillary permeability tests were also carried out on the samples. Capillarity coefficients of geopolymer mixtures are below 0.377 kg/m2.min0.5. It has been suggested that concrete mixtures produced from recycled geopolymer powder can be used in the load-bearing elements of structures that need to remain at the level of use immediately under the effect of dynamic load.

Mechanical and micro analyzes were carried out on the recycled concrete samples obtained by preparing different mixtures of geopolymer powder, metakaolin, lime, quartz and sodium silicate as alkali activator and sodium hydroxide solution, which were formed by grinding the geopolymer concrete samples prepared with certain temperature and low curing times. Recycled concrete samples with geopolymer powder, with a weight ratio of 36% in 1m3 volume, were prepared at 60 for 6-8-10 hours of curing. The test results showed that the highest compressive strength of the mixtures was 77.89 MPa with the increase of the lime ratio in the 8 hour curing period. It was determined that the highest compressive strength was 73 MPa in the samples in which metakaolin was never used and the lime ratio was maximum, the compressive strengths of the samples with 0.05% lime ratio of metakaolin and 0.025% lime ratio of metakaolin and 0.05% lime ratio of metakaolin were 74 and 77.89 MPa, respectively. In addition, capillary permeability tests were also carried out on the samples. Capillarity coefficients of geopolymer mixtures are below 0.377 kg/m2.min0.5. It has been suggested that concrete mixtures produced from recycled geopolymer powder can be used in the load-bearing elements of structures that need to remain at the level of use immediately under the effect of dynamic load.