Agricultural Waste Recycling by Using Para-wood Ash as Composite Material for Interlocking Block
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Abstract
The objective of the research project was to develop Interlocking blocks production by increasing cement replacement ratio with Para-wood ash and increasing concrete curing periods. Recycling of Para-wood ash in this study intended to reduce a huge volume of industrial waste that is disposed monthly up to 3,000 tons, which may be a cause of environmental contamination from ash with high pH value of about 9-11. Further advantage is for saving material cost spent in production of interlocking blocks that will accelerate higher profit in shorter payback period. Orange color soil in fine particle was used as a main material with proportion of 6 in 7 part by weight and the remaining material was binder. Five various proportions between Para-wood ash and cement as the binder mixture were experimented, that was composed of 0:100, 10:90, 20:80, 30:70, 40:60 and 50:50, tested in three curing time periods of 60, 90 and 120 days. The results showed that interlocking blocks could be created with the highest compressive strength at the curing time period of 90 days yielding 5.96, 4.86, 4.59, 3.72, 3.63 and 3.40 MPa respectively. This indicated that increasing Para-wood ash portions in the mixture led to reducing compressive strength. The average weight of interlocking blocks in this study was 5.2 kilogram/piece with density of about 1,740 kg/m3. The optimal mixture and curing time were 20:80 and 90 days respectively which yielded the compressive strength of 4.58 MPa. The result presented high potential of using Para-wood ash as a cement substitute ingredients to produce non-loading interlocking blocks which could support compressive strength between 2.5-5 MPa by increasing 50 percent by weight of Para-wood in the mixture. As a result, unit price was reduced from 4.64 to 3.57 Baht per piece and the payback period could be reduced from 9.5 to 8.1 months.
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References
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