Uticaj zamene cementa krečnjačkim filerom na svojstva betona

Abstract

U radu su prikazana eksperimentalna ispitivanja jedne vrste zelenih betona kod kojih je Portland cement zamenjen sa dve vrste krečnjačkog filera istog porekla i mineraloškog sastava, a različite finoće mliva. Projektovano je deset mešavina kod kojih je 0%, 15%, 30% i 45% (maseno) cementa zamenjeno filerom. Vodocementni faktor bio je konstantan (w/c=0.54), dok je vodopraškasti opadao sa povećanjem procenta zamene. Izbor granulometrijskog sastava čestica izvršen je pomoću Fankovog i Dingerovog, kao i pomoću Fulerovog modela. Rezultati su pokazali da je moguće povećanje čvrstoće betona pri pritisku uz smanjenje 45% cementa, ali da buduća istraživanja treba usmeriti ka poboljšanju obradljivosti.

This paper presents an experimental research of one type of green concrete in which Portland cement was replaced with two types of limestone filler of the same origin and mineralogical composition, but with a different fineness of particles. Ten concrete mixtures were designed in which 0%, 15%, 30% and 45% (by mass) of cement were replaced with filler. The water to cement ratio for each mixture was constant (w/c=0.54), and the water to powder ratio was decreasing with increasing cement replacement. Particle size distribution was selected using Funk and Dinger, as well as using Fuller's model. The results showed that it is possible to increase the compressive strength of concrete by reducing 45% of cement, but further research should be focused on improving the workability.