Wood Shavel Composites with Friendly Environment Based Binder

Abstract

Wood fiber has long been known as fiber reinforcement for concrete . Because of the availability and low cost of production, natural fiber has been used in less developed countries where conventional building materials are very expensive. Fiber added to cement composite for increasing toughness, strength, impact resistance and resistance to fire.In this study, initially it is expected to develop an environmentally matrix binder for the composite by utilizing fly ash as the largest proportion of the matrix binder, silica fume and limestone.Fillers used in this study are differentiated into sawdust and wood shavel. Wood shavel filler were on two condition : treated in base liquid and untreated. The particle size of the sawdust used for the composite were those retained on ≠ 0.60 mm sieve size, while wood shavelgradation was used as received.Results of the flow test of fresh mortar for the entire design matrix either without or with filler are very low, that do not meet the flow specification standard. The limestone matrix using 35 % by volume has a low compressive strength , as it acts as a diluent in the mixture. The optimized volume proportion of matrix composites is 12 % (filler) : 47 % (binder) : 41 % (water). This composite has a dimensional stability, compressive strength of 211.6 kg/cm2 > minimum requirement of cement board ( 150 kg/cm2 ), while the flexural strength 73.3 Kg/cm2 < provision of cement board ( 90-150 Kg/cm2 ) .The density of the composite boards is 1.28 gr/cm3, and this can be considered high, but this also causes the composite board difficult to be cut and installed. Most of the test results on the composite board referring to JIS A 5908 do not fit the provision for the cement boards, although the difference is not too great. Therefore, during the production, compaction and curing or post-production treatment need to be considered.