The effect of using pumice powder and plasticizer on physico-mechanical and thermal properties of cement-bonded particleboards

Abstract

In this study, the effect of using pumice powder and plasticizer on some properties of cementbonded 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 was found 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 of plasticizer 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.

U radu je opisano istraživanje utjecaja praha plovućca i plastifi katora na neka svojstva cementom vezanih iverica (CBPB). Stoga su CBPB proizvedeni upotrebom 0, 10, 20 i 30 % praha plovućca te 0, 0,4, 0,8 i 1,2 % plastifi katora. Na temelju rezultata ispitivanja utvrđeno je da je prah plovućca imao znatan pozitivni učinak na upijanje vode i debljinsko bubrenje ploča, dok se gustoća ploča nije mijenjala. Upotrebom 30 % praha plovućca debljinsko se bubrenje ploča smanjilo za 15 %. Modul elastičnosti i međuslojna čvrstoća proizvedenih ploča uz upotrebu praha plovućca povećali su se za 20 %, dok su se modul loma i toplinska izolacija smanjili. Upotreba 0,4 i 0,8 % plastifi katora pozitivno je utjecala na svojstva ploča. Primjena plastifi katora pozitivno je utjecala i na toplinska svojstva ploča. Pri povećanju količine plastifi katora na 1,2 %, vrijednosti toplinske vodljivosti smanjile su se za 18 %. Stoga je upotreba plastifi katora u proizvodnji CBPB-a jedna od opcija za poboljšanje toplinskih svojstava tih ploča.