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 21 for “"Moisture movement"”.
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Influence of geometry on creep and moisture movement of clay, calcium silicate and concrete masonry
This investigation involved creep and moisture movement measurements for about six months on 13-course clay (Engineering class B) and calcium silicate brickwork, and 5-course concrete blockwork, consecutively. Four different geometries of masonry were built, namely: single-leaf wall, cavity wall, …
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Compliance, relaxation and creep recovery of normal strength concrete.
… to drying in addition to creep measured without moisture movement. The movement of moisture is a major complication in developing creep prediction equations. In addition, to estimate shrinkage and creep, the structural engineer is required to calculate the loss of prestress and strain/deflection …
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Moisture occurrence in roof assemblies containing moisture storing insulation and its impact on the durability of building envelope
Moisture storing insulation such as cellulose has gained a large segment of the residential market, both in new and retrofit construction. Moisture deposited by exfiltration and adsorbed within the envelope reduces the thermal performance of the envelope and favors fungus growth leading to …
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An experimental and theoretical investigation of the migration of moisture in cocoa beans
… essentially an investigation of non-convective moisture movement as the result of a temperature gradient in hygroscopic porous materials, in particular, cocoa beans. The aim of the research has been to determine experimentally the bulk moisture diffusion coefficient for cocoa, and, by …
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Moisture Gradient Measurement During Kiln Drying of Red Oak
… lies in understanding and controlling moisture movement during drying. As wood dries, strains and stresses develop as a result of restraints imposed by moisture gradients and differential shrinkage in wood. So accurately measuring the moisture gradient in wood during drying will be …
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A theoretical and experimental investigation of moisture diffusion in wood
… of the diffusion equation to the problem of moisture movement below the fiber saturation point is investigated. The general diffusion equation was solved by numerical methods for the case of a concentration-dependent coefficient and a boundary condition of a specified concentration variation. …
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Fully coupled CEM/CFD modelling of microwave heating in a porous medium
… properties which depend both on temperature and moisture content. By investigating the resonant behaviour in two-dimensional microwave cavities, the FD-TD scheme is validated. Validation of the microwave power distribution in 3-D microwave enclosures is compared with other numerical results …
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Understanding effects of pre-soaked lightweight aggregate on volume stability of mortar and concrete mixtures
… of structures, which results in a high rate of moisture loss from the exposed surface. An extensive body of literature suggests that pre-soaked lightweight aggregate (LWA) is greatly beneficial for curing concrete internally and reducing autogenous shrinkage by providing additional water …
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An evaluation of unsaturated flow models in an arid climate
… the HYDRUS and SHAW models for predicting soil-moisture movement and variable surface phenomena for bare soil conditions in the and vadose zone. The development of calibrated models along with the atmospheric and soil data collected at the site provide useful information for predicting future …
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The effect of stringer design and leading-edge design on the strength characteristics of wooden pallets
… notch ends and (b) by retarding longitudinal moisture movement through the notch ends by notch coating. The leading-edge design of the paIlet was studied by determining its impact resistance if fabricated with leadboards and stringers of different species and specific gravities. The impact …
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Development of a simulation model for drying deformation in radiata pine boards
… and knot types were illustrated. During drying, moisture desorption in timber results in deformation. In order to use an appropriate partial differential equation for moisture movement in timber, Fick's second law was expanded by further incorporating the effects of mass velocities and thermal …
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Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
… retrofitted using advanced composites. Moisture distribution during drying in concrete wrapped with carbon composite bands was investigated using non-linear finite element techniques and relative humidity measurements. When a banded layout was used, it was observed that the width of the …
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Intercomparison of soil hydrology modules in the MIT Integrated Global System Model for analysis of climate issues
… are due to deficient representation of soil moisture movement in its shallow soil column. The deep lower soil layer in the hydrological module in the Climate Model over-drains the thin upper soil layer; the dryness of the upper layer adversely affects energy partition at the land-atmosphere …
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Vacuum Steam Technology for Rapid Plasticization and Bending of Maple
… Steamed wood is less rigid since adding moisture and heat to wood results in plasticization. Steaming at atmospheric pressure is the common technique for wood bending where diffusion prevails as the predominant mechanism governing moisture movement. Applications using conventional …
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The conditioning of confectionery products
… DVS which would enable some basic modelling of moisture movement within sweets to be undertaken. Phase diagrams were also produced at varying sugar levels. The thesis concludes with a further work section which considers areas of research which could follow on from the results.
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Application of thermocouple psychrometers to field measurements of soil moisture potential.
… has made possible the measurement of soil moisture potentials to values as low as -80 bars. The applicability of this type of psychrometer to "in situ" measurements of moisture potential at a Sonoran desert field site is investigated. An evaluation is made of the effect of variations in …
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Circuit rating methods for high temperature cables
… operation can lead to significant problems with moisture migration which is not easily modelled by traditional calculations. To overcome this a full dynamic backfill model has been created which explicitly models moisture movement and allows its impact on the thermal profile around a high …
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Evaluation of Moisture Diffusion Theories in Porous Materials
Moisture transport in building materials is directly responsible for structural damage, as well as poor indoor air quality. For these reasons, the need to understand transfer mechanisms and predict moisture transport through building materials has increased over the last couple of decades. Although …
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The Relationships Between the Volumetric Deformation Moduli of Unsaturated Soils
… practical problems involving volume change, moisture movement, bearing capacity and slope stability analysis. The measurement of these moduli generally requires modification to conventional laboratory equipment. The solution of unsaturated soil problems would be greatly facilitated if the …
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Moisture response of CLT floor assemblies under indoor water leakage: Experimental and simulation-based assessment
… use in sustainable construction, the long-term moisture performance of Cross-Laminated Timber (CLT) under damp service conditions remains a critical durability concern. This study investigates the moisture response of CLT floor assemblies under indoor water leakage through controlled laboratory …
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