Insulating and fire-resistance performance of calcium aluminate cement based lightweight mortars


KÖKSAL F., COŞAR K., Dener M., Benli A., Gencel O.

Construction and Building Materials, vol.362, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 362
  • Publication Date: 2023
  • Doi Number: 10.1016/j.conbuildmat.2022.129759
  • Journal Name: Construction and Building Materials
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, CAB Abstracts, Communication Abstracts, INSPEC, Metadex, Veterinary Science Database, Civil Engineering Abstracts
  • Keywords: Calcium aluminate cement, Expanded vermiculite powder, Lightweight mortar, Fire resistance, Insulation
  • Yozgat Bozok University Affiliated: Yes

Abstract

© 2022 Elsevier LtdThe study investigated the effect of two different cement types and expanded vermiculite powder (EVP) utilized as fine aggregate on the insulating and fire-resistance performance of lightweight mortars. To lower the density and heat conductivity of mortars, EVP was utilized as a 'full' replacement for river sand. Cements used were calcium aluminate cement (CAC) and Portland cement (PC). Four different EVP/cement (PC or CAC) ratios were determined: 3, 4, 5 and 6. The mortar specimens produced were exposed to temperatures of 20 °C, 300, 600, 900 and 1100 °C. The mechanical properties, dry unit weight, ultrasonic pulse velocity and thermal conductivity tests after 28 days of standard curing were performed to examine the impact of high temperatures on the mortar specimens. Microstructural deteriorations caused by high temperatures were investigated by scanning electron microscope. Mixture with an EVP/CAC ratio of 4 generally showed the best performance against high temperature in terms of compressive strength. Mortar with an EVP/CAC ratio of 6 showed the lowest thermal conductivity at both 20 °C and 1100 °C. According to the experimental findings, expanded vermiculite and CAC can be used to make fire-resistant cement-based lightweight composite coating materials and expanded vermiculite can also be employed as a lightweight aggregate in building insulation plaster applications