Investigation of the physical and chemical properties of carbon-based material additive cement mortar: an experimental design-based multi-response optimization application

In this study aims to improve the product quality with the use of TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) based Taguchi-based metot, the multi-response optimization process of graphene oxide synthesis(GO) from the graphite by Hummers metot and reduction of the GO using NaBH4 was performed in the first stage. In the second stage, cement mortar contains high amounts of synthesized GO (GO-BETON) and cement mortar contains carbon based materials (KK-BETON) was produced. The determined quality criteria for multi-response optimization of GO and rGO are the ratio of D density to G peak density (D/G), 2D peak intensity (I2D), D + D 'peak densities, crystal size (KB), surface roughness (Sr) and the carbon to oxygen atomic ratio (C / O), respectively. The improvement rates of 19.36%, 15.19%, 58.92%, 40.10% for GO synthesis and 1.51.% , 101.82%, 48.05%, 57.49% for rGO synthesis was obtained for selected criteria such as D/G, C / O, KB and Sr, respectively. Thus, the first stage was completed and the optimum mixing ratios for GO and rGO production were determined on a large scale. Quality criteria for multi-response optimization (GO-BETON and KK-BETON) for cement mortars produced in the second stage was determined as thermal conductivity, heat capacity, water absorption percentage (SE), ultrasonic sound velocity (USH), compressive strength (BD) and sulfuric acid resistance (AKK). 56-days thermal conductivity, 56-days heat capacity, 28 days SE, USH, BD and AKK quality criteria for cement mortar was obtained as 10.9%, -6.5%, 10.83%, -1.99%, and 59.62% for GO-BETON; 18.95%, -1.72%, -9.47%, -0.4%, 33.91% and 44.55% for KK-BETON, respectively. The results showed that the graphene oxide and carbon fiber used in the cement mortar designs are suitable for corrosion resistant usage for concrete applications such as sewer lines, dam and port concretes due to their superior chemical resistance and compressive strength.