When saw dust is used as a partial or full replacement of Fine aggregate in the manufacturing of light weight and low cost brick.
Does it offers strength and it will be durable ?
And its resistance against temperature will be good ?
Sawdust is used as pore former to attain insulating properties of bricks. Sawdust used is generated from the mechanical processing of raw wood in the sawing process. Two types of sawdust. The incorporation of sawdust into the mixture has been proven as a key factor in altering quality, affecting technological properties of the final ceramic product
1. The Alep pine (family of coniferous woods) and
2. Eucalyptus (hardwood broad family). Both wood wastes are distinguished by their origin, structure, physical properties, chemical, etc.
The having sawdust particle size 1.6 mm provided better results. Eucalyptus addition sawdust can be used as secondary raw materials for production of lightweight insulating ceramic bricks. Optimal results are obtained by incorporating 9 % (wt) of eucalyptus sawdust addition to clay body. The obtained compressive strength, flexural strength, unit weight, ultrasonic pulse velocity (UPV) and water absorption values satisfy the relevant international standards.
The use of saw dust as replacement of fine aggregate in brick will lead to reduction in strength, which further decreases with increasing saw dust content. In terms of durability, the introduction of saw dust as aggregate into brick will increase the overall porosity of the composite leading to less durable brick. On the other hand, the use saw dust ash will improve the properties of the brick due to possible pozzolanic reaction
The utilization of saw dust will affect the strength negatively. Similarly, for the durability characteristics it is not a good choice, as it will increase the porosity and permeability related properties of the matrix.
Use of sawdust in brick as a replacement will affect the strength in ordinary unstabilsed bricks but if used with cement stabilisation, the strength was found to have increased with certain percentage of stabilisation.
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