Shrinkage of concrete incorporating wood ash

U ovome radu pobliže je analizirano korištenje pepela dobivenog spaljivanjem drvne biomase kao zamjena za udio cementa. Također, istražen je problem zbrinjavanja pepela jer se analizom postojećih situacija uočilo kako je veća cijena transporta i odlaganja pepela nego korištenja u neke nove svrhe. Biomasa ima veliki potencijal za iskorištenjem u energanama, ali isto tako za sobom ostavlja pepeo koji je u drugim industrijama iskoristiv. Ujedno, ovaj rad bazira se na analizi korištenja pepela dobivenog spaljivanjem drva u betonskoj industriji. U sklopu eksperimentalnog dijela provedena su istraživanja ponašanja betona s dodatkom pepela. Analizirali su se rezultati mjerenja skupljanja uslijed sušenja na uzorcima u kojima je pepeo određenim udjelom zamijenio cement. Nadalje, uzorci su podvrgnuti nerazornoj metodi određivanja brzine prolaska ultrazvučnih valova, te je na istima ispitana tlačna čvrstoća. Provedena su još ispitivanja poroznosti, kapilarnog upijanja i plinopropusnosti.The paper investigates the exploitation of ash from wood biomass as exchange for cement. Also, this paper investigates the problem of disposal the ash because the analysis show that the price of transport and disposal is bigger than the price of using ash in other purpose. Biomass has big potential in power plants, but also leaves ash that is usable in other industries. At the same time, this paper investigates the exploitation of ash wood biomass in concrete industry. Within this experiment has been executed the investigating behavior of concrete with ash. Testing will be carried out on concrete samples where same of the cement has been replaced by wood biomass ash. Furthermore, samples have been submit to nondestructive method to determine the speed of ultrasonic waves, and same samples have also been tested for compressive strength. Concrete samples have also been tested for porosity, capillary absorption and gas-permeability