Determination of engineering properties of Elaziğ ferrochrome slag, alkali activated glass fiber and waste marble powder added mortars

Unlike conventional concrete, composites obtained by using pozzolans instead of cement and alkali activators instead of water are called alkali activated concretes. Industrial wastes such as fly ash and blast furnace slag are widely used in alkali activation concretes due to their low cost and easy availability. The fact that alkali activated concretes can be produced without the use of cement, thus being a composite that has no harmful effects on the environment has attracted the attention of many researchers. In this study, it is aimed to produce ferrochromium slag, which is ground at the same fineness instead of cement, and concrete activated with alkalis using marble dust and glass fiber as additives. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solutions were used as alkaline activators. The ratio of NaOH / Na2SiO3 in the mixture was determined as 1/2 as a result of preliminary tests. 90C temperatures was applied for the alkaline activator. Activation temperature of 90C was applied for 24 hours. In the study, the activator (NaOH + Na2SiO3) / binder (slag) ratio was tested as 0.35, 0.40 and 0.45. While preparing these proportions, different mixtures were prepared by adding marble powder in the proportions of 5 %, 10 % and 15 %. Glass fiber was added to each sample as an additive at the rate of 0.5% of the whole mixture. 7 and 28 days test results of the samples were examined. Determination of consistency and setting start and end time tests were applied to the mortar samples. Compressive strength, abrasion resistance, unit weight test, capillarity test, ultrasound test as well as sulphate effect and freeze-thaw tests were applied on the concrete samples for each ratio. In the study, SEM analysis was used for microstructure investigations.