Investigation of the Effect of Plasticizer Additive Ratio on the Abrasion Resistance of Concretes

Abstract

In today's technology, there are various chemical additives that shape the fresh or hardened properties of concrete. Chemical additives can be added alone or by using several additives together in order to obtain the desired concrete properties. Usage dosages are chosen in such a way that they can meet the desired performance criteria and at the same time do not impair the fresh and hardened qualities of the concrete. In this study, physical, mechanical and durability properties of concretes produced by using chemical additives in different proportions were investigated. In the production of concrete samples, the water / cement ratio and cement amount were kept constant at 0.5 and 350 kg / m3, respectively. 0-4mm grain size crushed sand and 4-16 mm grain size aggregate are used as aggregate. The plasticizer used as a chemical additive was added at the rate of 0.5%, 1%, 1.5% and 2% depending on the amount of cement. Concrete samples of 150x150x150 mm for compressive strength, archimedes weighing and 71x71x71 mm for abrasion tests were produced for use in experimental studies. After the concrete samples have been removed from the mold, they have been cured in the standard curing pool at a temperature of 20 ± 2 ° C for 7 and 28 days. Concrete samples have been subjected to archimedes, capillary water absorption, ultrasound transition rate, boh (wear), schmidt and compressive strength tests. The compressive strength of 7 and 28 days old concrete samples was determined. Physical properties such as water absorption percentage, porosity, unit weight, ultrasound transition rate, and weight losses in the wear test were measured only for samples of 28 days. The values with the lowest water absorption and porosity percentages were seen in the sample containing 1% plasticizer additive as 3,18% and 9,32% respectively. Ultrases transition velocity, schmidt test hammer and the highest compressive strength values were observed in the 28-day sample containing 1% plasticizer additive as 4901 m/s, 26.1 and 57,14 MPa, respectively. With the increase of the chemical additive ratio, weight losses due to wear have decreased.