Investigation of the effect of carbon fiber dimensions on electrical conductivity in mortar

This study was carried out on F and C class fly ash reinforced and carbon fiber added mortar samples as a repla cement for CEM I 42,5 R cement. Class F and C Series with 10% and 20% flyash as well as without fly ash were created separately. Fly ash series created to investigate the effects of the size and rat io of carbon fiber on electrical conductivity. They were produced without carbon fiber rein for cement, with carbon fiber rein for cement in 5mm and 10mm length, with 0.5%;1% and 3% ratios in 33 different combinations. The water / cement ratio was prepared to take the value of 22-23 cm in the Spreading Table Test. DegasetVisco L viscosity regulator was used at a ratio of 0.1-1% of the fine material in order to distribute the carbon fiber homogeneously in the mortar mixture. Three samples were prepared for eachs eries in order to reduce the margin of error. Curingperiodsaredetermined as 7, 28 and 56 days. Theelectricalresistivity of thesamples, whichcompletedtheircuringperiod, wasmeasured in theovendryandnaturalhumidconditions. Bydeterminingthewaterabsorptionrates of thesamples, theelectricalconductivityrelationwasexamined. Compressivestrengthandbending tensile strengthtestshavebeenapplied. Increasingthecarbon fiber lengthandratioincreased tensile strengthvalues in bending. It has beenobservedthatcarbon fiber increasestheelectricalconductivity of themortar, however, theconductivitydecreaseswith time. As thedimensionandratio of carbon fiber is increased, it wasobservedthatthecompressivestrengthdecreasedduetothevoideffect in themortar, whiletheincrease in the rate of F classflyashalsoincreasedthecompressivestrength of themortar. SEM (ScanningElectronMicroscope) examinationwasperformedtoseethemicrostructureandcarbon fiber distribution of thesamplesand it wasseenthatthecarbon fiber distributionwas in a waytosupporttheelectricalconductivitymeasurement. Thestudymade it possibletocomparethe size andproportioneffect of carbon fiber reinforcedandaddedmortarsamplesaccordingtoclass C and F.