Gökhan Kürklü

The Investigation of Heat Performance and Thermal Conductivity of Different Wall Materials at High Temperatures

The current study investigated heat transfers at high temperatures and compressive strength after exposure to high temperatures of gas concrete, clay brick, rice husk bricks used as wall materials, and gypsum plaster and common plaster used as coating materials. Tests measuring apparent porosity, water absorption, bulk density and compressive strength were performed on the samples prepared in 100 mm x 100 mm x 100 mm size. In the high-temperature experiment, the samples with K-type NiCr-Ni thermocouple were placed in a specially designed laboratory furnace. The internal temperature of the furnace was set at 800 o C. The researchers found that out of the samples exposed to high temperatures compressive strength and thermal conductivity of the gypsum plaster mortar were better than those of the common plaster mortar. Furthermore, the gas concrete, a wall material, was found to have a low thermal conductivity. As a result, the gas concrete and common plaster mortar, which were exposed to high temperature, were found to be more durable than other materials and, therefore, more advantageous when used in construction.

The Effect of Amount of Alkaline Solution on Fly ash and Metakaolin based Geopolymer Mortar Properties

This study investigated the effect of four different amounts of alkaline solution (240, 270, 390 and 435 ml) used in the production of metakaolin and fly ash-based geopolymer mortar on sample properties. In the preparation of geopolymer mortars, metakaolin obtained by the sintering at 1000 °C of kaolin clay and fly ash obtained from Kutahya Seyit Omer (Turkey) thermal power plant was used. Geopolymer mortars were cast into 40x40x160 mm molds and cured for 5 h at 80 o C in a laboratory-type oven. The curing process of the samples was completed, and they were subjected to physical and mechanical tests at the end of the 7th day following their production. Consequently, it was determined that the ideal amount of alkali solution in the preparation of the geopolymer mortar samples was 270 ml. In addition, the flexural and compressive strength values of the geopolymer mortars produced using 270 ml alkaline solution were 4.9 MPa and 21.8 MPa, respectively.