Estimation of Properties of Unfired Ceramic Products with Sawdust Additives

Abstract

Previously obtained experimental data have been used to develop empirical models to estimate the physical and mechanical properties of unfired ceramic model products with sawdust additives. The models were herein used to study similar product development requiring additives such as straw to meet specific properties with further possible cost reduction. Results can also be used to implement and standardise methods presently observed to be used in producing inexpensive interior walls in many suburbs around the globe. Experimental results and empirical model equations for mixtures investigated, include 60% clay, 20 % cement, 0 – 5 % sawdust (X), which correspond to 20 – 15 % silica sand. The determined properties are respectively, % water absorption [17.54 to 29.70 %]; bulk density [1.69 to 1.43 g/cm3]; modulus of rupture [54.03 to 7.67 MPa]; and compressive strength [23.20 to 5.86 MPa,]. Only the water absorption increased with increased values of sawdust while the bulk density, modulus of rupture and compressive strength indicated reduction. The model estimations were limited to sawdust additives not exceeding 4% for useful practical purposes. Keywords: Unfired ceramic model products, Empirical model equations, Sawdust additives. African Research Review Vol. 2 (4) 2008: pp. 144-156