The Effect of Using Pumice Powder and Plasticizer on Physico-Mechanical and Thermal Properties of Cement-Bonded Particleboards/Utjecaj praha plovucca i plastifikatora na fizic ko-mehanicka i toplinska svojstva cementom vezanih iverica

In this study, the effect of using pumice powder and plasticizer on some properties of cement-bonded particleboards (CBPBs) was investigated. Therefore, CBPBs were produced using 0 %, 10 %, 20 % and 30 % pumice powder and 0 %, 0.4 %, 0.8 %, 1.2% plasticizer. Based on test results, it wasfound that using pumice powder had an important positive effect on water absorption and thickness swelling, but no effect on density. The amount of thickness swelling decreased by 15 % with the use of 30 % pumice powder. The modulus of elasticity and internal bond strength were generally increased by 20 % with the use of pumice powder, while modulus of rupture and thermal insulation properties were decreased. The use of 0.4 % and 0.8 % plasticizers positively affected the properties of board properties. The use ofplasticizer had a positive effect on thermal properties. The thermal conductivity values decreased by 18 % as the amount of plasticizer increased to 1.2 %. In this regard, the use of plasticizers in CBPBs production is an option in terms of improving thermal properties. Keywords: cement-bonded particleboard (CBPBs); pumice; plasticizer; physical and mechanical properties; thermal conductivity U radu je opisano istrazivanje utjecaja praha plovucca i plastifikatora na neka svojstva cementom vezanih iverica (CBPB). Stoga su CBPB proizvedeni upotrebom 0, 10, 20 i 30 % praha plovucca te 0, 0,4, 0,8 i 1,2 % plastifikatora. Na temelju rezultata ispitivanja utvrdeno je da je prah plovucca imao znatan pozitivní ucinak na upijanje vode i debljinsko bubrenje ploca, dok se gustoca ploca nije mijenjala. Upotrebom 30 % praha plovucca debljinsko se bubrenje ploca smanjilo za 15 %. Modul elasticnosti i meduslojna cvrstoca proizvedenih ploca uz upotrebu praha plovucca povecali su se za 20 %, dok su se modul loma i toplinska izolacija smanjili. Upotreba 0,4 i 0,8 % plastifikatora pozitivno je utjecala na svojstva ploca. Primjena plastifikatora pozitivno je utjecala i na toplinska svojstva ploca. Pri povecanju kolicine plastifikatora na 1,2 %, vrijednosti toplinske vodljivosti smanjile su se za 18 %. Stoga je upotreba plastifikatora u proizvodnji CBPB-a jedna od opcija za poboljsanje toplinskih svojstava tih ploca. Kljucne rijeci: cementom vezana iverica (CBPB); plovucac; plastifikator; fizicka i mehanicka svojstva; toplinska vodljivost