The effects of expanded perlite aggregate, silica fume and fly ash on the thermal conductivity of lightweight concrete

Demirboga R., Gul R.

CEMENT AND CONCRETE RESEARCH, cilt.33, sa.5, ss.723-727, 2003 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Sayı: 5
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0008-8846(02)01032-3
  • Dergi Adı: CEMENT AND CONCRETE RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.723-727
  • Anahtar Kelimeler: silica fume, fly ash, expanded perlite aggregate, lightweight aggregate concrete, thermal conductivity, CEMENT PASTE
  • Atatürk Üniversitesi Adresli: Evet

Özet

Thermal conductivity coefficients of concretes made up of mixtures of expanded perlite and pumice aggregates (PA) were measured. To determine the effect of silica fume (SF) and class C fly ash (FA) on the thermal conductivity of lightweight aggregate concrete (LWAC), SF and FA were added as replacement for cement by decreasing the cement weights in the ratios of 10%, 20% and 30% by weight. The highest thermal conductivity of 0.3178 W/mK was observed with the samples containing only PA and plain cement. It decreased with the increase of SF and FA as replacement for cement. The lowest value of thermal conductivity, which is 0.1472 W/mK, was obtained with the samples prepared with expanded perlite aggregate (EPA) replacement of PA and 70% cement + 30% FA replacement of cement. Both SF and FA had a decreasing effect on thermal conductivity. EPA (used in place of PA) also induced a decrease of 43.5% in thermal conductivity of concrete. (C) 2002 Elsevier Science Ltd. All rights reserved.