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Effect Of Reprocessed Pure Water Sachet (pws) On The Properties Of Wood Wool
[A CASE STUDY OF OMO WOOD ALSTONIA LONGENSIS] -
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CHAPTER THREE
METHODOLOGY
3.1 INTRODUCTION
The production of the cubes involves the construction wooden moulds, acquisition of materials, mixing of the cube materials, pressing and curing. A laboratory test on the physical and mechanical properties of the cube is carried out.
3.2 MATERIALS PROCUREMENT
The wood planks used were procured from the sawmill at Irewolede and it is commonly known as Omo wood (Alstonia Longesis). The wood planks were cut into thinner planks with a motorized circular saw machine and wood shavings removed with the use of a manual hand wooden smooth machine. The wood shavings were of satisfactory thickness of between 0.4 – 0.6mm and varying width; however, they vary in length.
The “Pure Water Sachet†(PWS) were collected from the Blue Mist Water Factory, thereafter the sachets were dried so as to eliminate any form of water or moisture that might be present them cut it in to smaller pieces and chemically reprocessed by soaking them in an organic solvent Xyleme. The cement water ratio used was 2:1 (by weight) which is required for complete hydration of the cement. The water used was ensured to be free of dirt, impurities such as suspended solids, organic matter and salts which may adversely affect the setting, hardening and strength of materials used for the production of the cubes.
The cement used is Portland cement produced from Obajana factory of Dangote Ordinary Portland Cement, whose properties conform to BS12 for Ordinary Portland Cement.
3.3 CONSTRUCTION OF MOULD
A set of wooden mould built with soft wood were made. The dimension of the mould is 50mm x 50mm x 50mm. The mould were constructed in such a way that the cube can easily be removed from it.
3.4 CASTING
The mix production of Ordinary Portland Cement, wood wool, reprocessed “pure water sachet†(PWS) and water was done in terms of weight and was determined carefully to ensure that the result meet the required standard.
The wood shaving were soaked in water for 24 hours to remove the sugar content and then air dried. The wood shavings were then broken into thin strands to given a better mix with cement. The mix ratios were 2:1:1:1 and 1:1:1:1 (i.e) 2gms of cement to 1gm of wood to 1gm of reprocessed PWS to 2gms of water) the second mix ratio did not include the use of reprocessed pure water sachet, hence the ratio were 2:1:1 and 1:1:1.
The reprocessed pure water sachet was thoroughly mixed with cement before wood wool was added and the trios were thorough mixture, clean water was added gradually until the mixing was complete. The sides of the moulds were rubbed with engine oil for ease of removal of cubes. Compaction was done in three layers to fill the brim and a load was placed the mould.
3.5 CURING
The wood wool cubes were allowed to dry after which they were remolded and cured for two weeks respectively (Evans 1996). Curing reduces shrinkage and increase strength and water tightness.
There are a number of methods developed for curing, however, for this project, curing was done by wetting the cubes and covering them with polythene sheets for complete two weeks.
3.6 TESTING
The test carried out on the wood wool cubes includes water absorption test compression test and dry density test. The water absorption and dry density tests is physical test while the compression test is a mechanical test.
3.6.1 DRY DENSITY TEST
In the process of determining the densities of the specimen, their dry unity weights were determined. Weights of the cubes were measured using the weighing balance. The ratio of the weight of cubes to the volume was then calculated.
3.6.2 WATER ABSORPTION
This test measures the absorption rate at which water is drawn into the specimens through pore openings for 24hrs, 72hours, and 2weeks. Each specimen was weighed and expressed as a percentage by weight based on the initial weight of the specimen at dry condition.
3.6.3 COMPRESSIVE STRENGTH TEST
This is carried out in the laboratory to determine the compressive force of the cubes. Poor adhesion of the wood wool to the cement paste cause premature spelling of the composite.
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CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE BACKGROUND TO THE STUDY1.0 INTRODUCTIONRight from when man stated to build, he has been compelled to use the locally available materials around him. Building has now become major construction material allover the world has necessitated a critical study of its constituent materials. More so, the present economic crunch calls for cost saving measures on the part of engineers/researchers involved in the management of the country’s project.Hence, the need for researchers to ... Continue reading---
CHAPTER TWO - [ Total Page(s): 4 ]Resistance of wood wool cement board against fungi attack also depends on the alkaline nature of the cement, since these micro-organisms prefer slightly acidic environment. Wood wool cement board have a thermal resistance of 0.18m2 ho/Kcal, a board specific gravity of 0.6 and thickness of 15mm respectively: thermal resistance increase with a decrease in specific gravity and an increase in thickness (Shigekura, 1989). While on the other hand, sound absorption was rated as 0.75 at 4000c/s for boar ... Continue reading---
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CHAPTER FIVE - [ Total Page(s): 1 ]4.3 DISCUSSION OF RESULTS The average density of the cubes produced without reprocessed pure water sachets and having a mix ratio of 2:1:1 is 706.66kg/m3 while the average density of cubes produced with processed pure water sachets and having a mix ratio of 2:1:1:1 is 810.67kg/m3. The average density of the cubes produced without reprocessed pure water sachets and having a mix ratio of 1:1:1 is 437.33kg/m3 while the average density of cubes produced with reprocessed pure water sachet ... Continue reading---
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CHAPTER THREE -- [Total Page(s) 1]
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CHAPTER THREE -- [Total Page(s) 1]
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