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 19 of 19 for “"Natural sand"”.
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The Effect on the Durability Properties of Concrete of Partial Replacement of Natural Fine Aggregates with Recycled Concrete Fine Aggregates
… the world has led to excessive exploitation of natural sand resources for use in the construction industry. This excessive utilization has led to the depletion of natural sand resources; for instance, in countries such as India and Indonesia, sand mafia and destruction of beaches due to illegal …
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Evaluation of 4.75 mm Superpave mix criteria for West Virginia
… methodology for low traffic volume. In Phase II, natural sand evaluation for 4.75 mm mixes; three approved Marshall designs were obtained from the WVDOT. Two of the mixes contained natural sand and the other was a 100 percent limestone mix. The Marshall mix designs were verified and then …
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Evaluation of field performance of fine-graded hot mix asphalt on Illinois' roadways
… to be tender mixes due to the inclusion of natural sand as the main fine aggregate. However, manufactured sand, which has a higher angularity than natural sand, is the main fine aggregate utilized in hot mix asphalt at this time. Manufactured sand, which is produced from crushed aggregate, …
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Aqueous and solid phase interactions of radionuclides with organic complexing agents
… picolinic acid as common co-contaminants), and natural sand (as simple environmental solid phase). A UV spectrophotometric and an IC method were developed to monitor the behaviour of EDTA, NTA and picolinic acid in the later experiments. The optimised methods were simple, applied …
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The potential of porcelain waste as sand replacement to produce high strength concrete
… in the construction industries, consumption of sand has increased which lead to series of problems such as natural sand depletion and its negative impact on the environment. This research is to investigate the possibility of using porcelain waste as sand replacement in the concrete production. …
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Extraction of physically-realistic pore network properties from three-dimensional synchrotron microtomography images of unconsolidated porous media
… verify the algorithms. Systems of glass bead and natural sand were used in this study to investigate the applicability of the algorithms. Additionally, porosity, specific surface area, and representative elementary volume (REV) analysis of porosity were calculated. The impact of resolution was …
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Waves, currents, and sediment transport in the surf zone along long, straight beaches
… the bed may be concrete or covered with movable natural sand grains. The present model must be efficient and flexible so that it can accommodate iterative computations for time-varying and hence arbitrary beach profiles. The near-shore hydrodynamics model consists of wave, surface roller, and …
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Exploratory study on high-performance concrete for bridge decks in West Virginia
… and the same limestone coarse aggregate, natural sand, and constant water/cementitious ratio. For each type, three mixtures were evaluated, with one of the three being defined according to the WVDOT-DOH specifications as a reference (20% fly ash and 30% slag by weight of total cementitious …
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The role of vector-derived microbiota and co-localization in the dissemination of vector transmitted pathogens
… transmission by the bite of an infected sand fly vector. This study investigated the role of inoculation method and the vector, sand fly gut-derived microbiota in modulating the host immune response and facilitating parasite dissemination. Utilizing a novel skin prick model that closely …
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The mechanics of an unbonded locked sand at low effective stresses
Natural soil deposits are likely to have a structure resulting from particle bonding or interlocking or both. Recent research on natural sand having a predominantly locked structure with very little cement bonding has shown that, at low stresses, this material tended to mobilise its peak strength …
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Performance of composite sand cement brick containing recycled concrete aggregate and waste polyethylene terepthalate
… locate adequate sources due to the shortage of natural aggregate supply. Construction waste can be recycled to replace naturals resource or other competitive materials. This study aims to establish the sustainable properties for composite bricks using Recycle Concrete Aggregate (RCA) and …
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Stress Transmission in a Granular System
… In this study, stress-transmitting grains in a sand specimen are identified using an image-based approach. The methodology consists of measuring the geometrical data of the individual grains and following their evolution. On the numerical side, a more realistic description of soil behaviour is …
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Physical mechanisms controlling the pre-failure stress-strain behavior of frozen sand
… the pre-failure stress-strain behavior of frozen sands are investigated in triaxial compression. The pre-failure, or small strain behavior (Ea<l%), is represented by the initial stiffness (Young's modulus) and the upper yield stress, a very distinctive yield point representing the onset of large …
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Platinum Slag as Fine Aggregate in Concrete for Coastal Applications
… global construction has intensified pressure on natural sand resources, with annual extraction estimated at approximately 50 billion tonnes. Extensive sand mining is linked to biodiversity loss, land degradation, and coastal erosion, impacts that are particularly acute in South Africa’s coastal …
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Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer
… against concurrent LDV measurements over a natural sand bed in a flume. The single measurement accuracy of the BASS Rake is higher than that of the LDV and the multiple sample volumes confer other advantages. For example, the ability of the BASS Rake to image vertically coherent turbulent …
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Enhancing Urban Energy Sustainability through PCM-Integrated Mortar Infrastructure
… strength reduction. Furthermore, by substituting natural sand with recycled glass, this study also addresses the importance of preserving natural resources. Initially, thermal efficiency and mechanical strength have been measured after fabricating mortar mixtures with partial mass replacements of …
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Sources of sediments accumulating in the lower Black and Vygekraal Rivers, Cape Town, South Africa
… owing to the extensive exposure of the natural sand cover as a result of poorly vegetated areas. Steep slopes, and construction works linked to urban development, also render the upper parts of the Elsieskraal catchment vulnerable to soil erosion. A relatively insignificant amount of …
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Use of end-of-waste foamed fibers and aggregates into a cementitious mortar
… density which obviously decreased at increasing natural sand substitutions. Moreover, the use of aggregates porosity as reservoir of internal curing water showed promising preliminary results. In brief, the results of this study demonstrate that engineered fibers with improved fiber/matrix bond …
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Development of Next-Generation Construction Materials with Graphene Additives
… binder (AAB) composites prepared with natural sand (NS) or lead smelter slag (LSS) sand cured at ambient temperature. This thesis consists of a series of studies with the focus on addressing current research gaps and making a contribution to the development of next-generation …