Abrasion resistance of concrete made with micro fibers and recycled granulated rubber

Abstract

Durability of concrete engineering structures in most part depends on the resistance of their surface to mechanical abrasion. The paper presents the results of experimental test of performance of concretes made with micro fibers and recycled granulated rubber in fresh and hardened state, as well as the comparative analysis of wear grinding resistance and hydroabrasive resistance of concrete. Six batches of concrete were made for the tests: reference concrete, concrete with partial replacement of fine river aggregate with recycled granulated rubber, two batches with the addition of polypropylene fibers (monofilament and fibrillated) and two batches of concrete with addition of steel hook ended fibers (short - having length 30 mm and long - having length 50 mm). It was found that the addition of micro-reinforcement or recycled rubber contributes to the increase of concrete wear grinding resistance and hydro-abrasive resistance. There is a difference in the abrasive resistance depending on test method.Trajnost betonskih građevinskih konstrukcija u najvećoj meri zavisi od otpornosti njihovih površina prema mehaničkom habanju. U radu su prikazani rezultati eksperimentalnog istraživanja performansi u svežem i očvrslom stanju različitih vrsta betona, kao i uporedna analiza otpornosti prema habanju brušenjem i hidro-abrazivne otpornosti betona. Za potrebe istraživanja napravljeno je šest serija betona: etalon beton (E), beton sa delimičnom zamenom sitnog rečnog agregata recikliranom granulisanom gumom (ER), dve serije betona sa dodatkom polipropilenskih vlakana (monofilamentnih (EPM)i fibriliranih (EPF)) i dve serije betona sa dodatkom čeličnih vlakana sa ojačanim krajevima (kraća - dužine 30mm (ESS) i duža - dužine 50 mm (ESL)). Utvrđeno je da dodatak mikroarmature ili reciklirane granulisane gume doprinosi povećanju otpornosti betona prema habanju brušenjem i hidro-abrazivne otpornosti. Postoji razlika u otpornosti prema habanju betona u zavisnosti od metode ispitivanja.