Influence of polypropylene fibers addition on adhesion between mortar and base material

Abstract

The results of own experimental explorations conducted in order to determine adhesion of mortar made with addition of polypropylene fibers are presented in this paper. The priciest concrete plates were used as a base material over which the mortar was cast in 3 cm thick layers. Six different series of specimens - cylinders were treated, depending on type and amount of used fibers, as well as on preparation techniques of surface between old and new material. The testing of adhesion was conducted using axial tension method. The obtained results showed significant improvement of this physical-mechanical property on specimens made with polypropylene fibers compared to control specimens (mortar without micro reinforcement).

U radu su prikazani rezultati sopstvenih eksperimentalnih istraživanja koja su imala za cilj određivanje veličine athezije (prianjanja) za podlogu maltera spravljenih sa dodatkom polipropilenskih vlakana. Kao podloga su korišćene prefabrikovane betonske ploče preko kojih je ugrađivan sloj maltera debljine 3 cm. Ukupno je tretirano šest serija uzoraka - kernova, u zavisnosti od vrste i količine upotrebljenih vlakana, kao i različite pripreme površine na kontaktu između starog i novog materijala. Ispitivanje athezije vršeno je pri čistom aksijalnom zatezanju. Ostvareni rezultati pokazuju značajno poboljšanje predmetne fizičko-mehaničke karakteristike kod maltera ojačanih polipropilenskim vlaknima, u odnosu na etalonske uzorke (malter bez dodatka mikroarmature).