The desing of self compacting lightweight concrete produced with bi̇tli̇s pumice and investigation of its properties

This thesis reports a laboratory work results on the design of self-compacting lightweight concrete produced with Bitlis pumice and investigation of its properties. In the thesis, CEM I 42.5 N type cement was used as a binder. Moreover, barite powder (BP), fly ash (FA) and volcanic pumice powder (VPP) were used as viscosity enhancing admixtures. In the mix design, cement was used in two different dosages (350 kg/m3 and 400kg/m3) with mentioned powder admixtures in the rates of 150kg/m3 and 200kg/m3. While volcanic pumice aggregate was been using as a coarse aggregate in all designed, natural river sand and crashed volcanic pumice aggregates were used in the design process. With all these materials and different usage percentages, 9 Self-compacting lightweight concrete (SCLWC) were designed applying slump-flow, V-funnel and L-box tests. Designed SCLWCs were cured at the ages of 3, 7, 14, 28, 56, 90 and 150-days in standard water cure at the temperature of 23±2⁰C. After the curing process, compressive strength, flexural tensile strength and ultrasonic pulse velocity tests were applied at each curing day. Besides, some durability tests were also implemented after the 90-curing day. High temperature, freezing-thawing, wetting-drying, acid resistance and relative-porosity tests were performed to detected durability properties of designed SCLWCs. SCLWC design was achieved in 9 different concrete mixes (E1-E9) and identified their fresh concrete, strength and durability properties. The best results were obtained from the series E4 including fine river aggregate and FA while the worst result obtained from the series E7 containing fully volcanic pumice aggregates and VPP. After the 28-curing day, all designed SCLWCs gained structural concrete properties. Concretes including river sand as fine aggregate gave the more strength properties than concretes containing fully volcanic pumice aggregates. FA using in the SCLWC design gave the better strength and durability properties and VPP using followed it. BP using in the design caused to produce the heavier concretes in terms of relative unit weight and gave the relatively similar strength and durability properties with VPP using.