Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Treated wood"”.
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Coating Performance on Preservative Treated Wood
Wood service life is significantly prolonged by the use of preservatives. Unfortunately, preservative treated wood is still susceptible to weathering degradation (UV and moisture) and subsequent leaching of preserving components. These negative impacts of weathering can be reduced by the …
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The Feasibilty of Recycling CCA Treated Wood From Spent Residential Decks
The amount of CCA treated wood being removed from spent residential decks is increasing at a tremendous rate. While most spent CCA treated wood is being disposed in landfills, further useful and environmentally beneficial alternatives have to be met. This research estimated the percentage of …
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Studies of the interactions of CCA and ACA preservative treated wood with soil
… changes at the interface between soil, and wood treated with CCA or ACA wood preservatives were investigated using a series of leaching and soil burial studies. The softwoods Scots pine (<i>Pinus sylvestris</i>, L.), Sitka spruce (<i>Picea sitchensis</i>, Carr) and the hardwood lime …
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An experimental study of the environmental impacts of CCA-treated wood waste land application
… arsenate (CCA) has been the most commonly used wood preservative in the UK; up until its partial ban in 2004. The preservative prolongs the service life of wood by 20-50 years by making it resistant to biological attack. As such, in-service CCA treated wood is expected to be a major component of …
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Chemical and biological factors affecting the performance of CCA and ACA treated wood in soil
The performance of CCA and ACA treated wood in soil contact has been investigated with particular reference to the effect of high concentrations of nitrogen on the decay process, fixation and leachability of preservative elements and the role of lignin in the binding of nitrogen and preservative …
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An investigation of CCA-treated wood in informal caterers' fuel stocks and related airborne arsenic in the Cape Town region
… of an estimated 3 billion people. Fuel wood remains an important but environmentally problematic fuel in this context. The urban poor are known to make use not only of harvested but also of waste timber. Prior studies in Cape Town indicated substantial uses of fuel wood by informal …
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Online sorting of wood treated with chromated copper arsenate using laser induced breakdown spectroscopy
The use of the CCA chemical as a wood treatment to protect against insect and fungal deterioration has had commercial application for the past twenty-five to thirty years. While CCA treated wood has several benefits, with perhaps the most important being the saving of an estimated 225 million trees …
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Manufacture and rehabilitation of guard-rail posts using composites for superior performance
… strength and durability of a conventional CCA treated wood post was studied. A combination of HMR as primer and epoxy as adhesive was found to provide the best possible adhesion of a glass fibers to CCA treated wood. Wrapped samples, representing a scaled down version of the proposed posts were …
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Development and evaluation of glass fiber-reinforced composite/wood railroad crossties
… to select compatible adhesive between creosote treated wood and glass fabric, and study the performance of wrapped wooden crossties.;Five primer/resin combinations (Resorcinol Formaldehyde group) were screened for strength and durability of treated wood crossties. To evaluate stiffness and …
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Organosilicon compounds as potential wood protecting agents
Wood is very diverse and has specific features making it easily distinguishable from other materials. Due to its properties it can be applied both inside and outside, making it a rewarding material to work with. However, when applied outside it is liable to weathering, inducing changes to the wood, …
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Penetration and permanence of an organophosphate and a pyrethroid in structural wood for insect control
… loss of chlorpyrifos from the surface of the wood but relatively stable below-surface concentrations. Similar studies with 0.5% permethrin [(3-phenoxypheny]) methyl] (+) - cis, trans-3-(2,2-dichloroethenyl)-2,2dimethylcyclopropane-carboxylate] applied to the same wood types revealed comparable …
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Mechanical behavior of red oak in transverse compression as affected by hydro-treatments and its relations to changes in cell wall structure and composition
… investigated. Small specimens of red oak heartwood were submitted to steam-treatments at atmospheric pressure for 1.5, 3, 6, 12, 24, 48, and 96 hours. Short steaming induced little or no changes in the properties and the composition of red oak. Prolonged steaming, however, resulted in …
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A two-stage thermal modification of wood
… stability and biological durability of wood. An undesired side effect is the reduction of mechanical properties of wood, mainly due to the high temperatures involved (150-280°C). In this thesis the effects of heat treatment on wood properties are discussed in relation to anatomical and …
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Aspects of chemical control of the old house borer, Hylotrupes bajulus (L.) (Coleoptera: Cerambycidae)
… of the final spray when it is applied to pine sapwood. The diluent of choice for providing the best penetration of the active ingredient, chlorpyrifos, is an Oil-based carrier for the formulated product Dursban® WT. Dursban® TC, another product containing chlorpyrifos, will penetrate the wood …
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Investigation of Bond Strength and Watertightness of Asphalt Concrete Wearing Surfaces for Timber Bridge Decks
… waterproofing membrane placed on a preservative treated wood deck overlaid with a bituminous concrete wearing surface. The second system consists of a treated wood deck overlaid with a base course of bituminous concrete, a waterproofing membrane, and a bituminous concrete wearing surface. The …
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Investigating the Surface Energy and Bond Performance of Compression Densified Wood
… energy of hygro-thermal compression densified wood were studied using comparisons to hygro-thermally treated and control yellow-poplar (Liriodendron tulipifera). Bond performance was studied using opening mode double cantilever beam fracture testing and cyclic boiling of one half of all …
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Biological control of wood decay in ground contact timbers
Wood placed in ground contact situations is susceptible to attack by a wide range of soil micro-organisms which degrade the wood structure, causing significant deterioration of the mechanical properties of the timber such as strength and elasticity.Chemical preservatives such as CCA …
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Immobilisation of copper, chromium and arsenic on stabilised domestic refuse
… whether in solution or in combination with wood, has the potential to become a global problem. This chemical is commonly called CCA or Tanalith, and is classed as a waterborne wood preservative. Current global production of this class of chemicals is estimated at 90 000 tonnes annum-1 In …
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Effects of environmental factors on wood decay micromorphology of Pinus radiata and Fagus sylvatica, and its significance for in-ground wood preservative performance
Wood preservatives are essential to the continued use of wood in situations where fungal decay and damage from wood boring insects such as termites, would otherwise occur. Significant risks to health and the environment arising from their correct use are unproven but new legislation and consumer …
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Studies on soluble nutrient components in wood and their influence on decay susceptibility and preservative efficacy
… and accumulate at evaporative surfaces of dried wood and the influence these nutrients have on wood decay and preservative performance. <br/><br/>Specific soluble carbohydrates and amino acids were shown to redistribute and accumulate at surface regions of wood during drying. Analysis of dried …
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