Properties of ultra-high performance fiber reinforced cementitious composites made with gypsum-contaminated aggregates and cured at normal and elevated temperatures

GESOĞLU M., GÜNEYİSİ E., Nahhab A. H., YAZICI H.

CONSTRUCTION AND BUILDING MATERIALS, cilt.93, ss.427-438, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 93
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.conbuildmat.2015.05.130
  • Dergi Adı: CONSTRUCTION AND BUILDING MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.427-438
  • Anahtar Kelimeler: Ultra-high performance fiber reinforced cementitious composite (UHPFRCC), Gypsum-contaminated aggregate, Internal sulfate attack, Expansion, Microstructure, Steam curing, MECHANICAL-PROPERTIES, UNIAXIAL TENSILE, CONCRETE, ETTRINGITE, RESISTANCE, SHRINKAGE, STRENGTH, BEHAVIOR, MORTAR, ATTACK
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Aggregates in many parts of the Middle East are contaminated with gypsum. Therefore, in this study the effects of using gypsum-contaminated natural sand on the compressive strength and expansion of ultra-high performance fiber reinforced cementitious composites (UHPFRCCs) were investigated over a period of one year. Two groups of UHPFRCCs were designed with binary and ternary cementitious blends of Portland cement, silica fume, and/or ground granulated blast furnace slag. Each group consisted of five mixes with different SO3 contents of between 0.11% and 4.5% by weight of natural sand. For each mix, the samples were either water cured or steam cured over a 48 h period. The microstructure of the cementitious composites was also studied by the SEM-EDX. Besides, some findings of UHPFRCCs were compared to those of Portland cement mortars. Test results indicated that UHPFRCCs showed a strength gain, particularly under steam curing and an insignificant expansion even in the presence of excess sulfates, in contrast to the mortars. (C) 2015 Elsevier Ltd. All rights reserved.