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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 45 for “"CONCRETE PROPERTIES"”.
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Design and Performance of Reinforced Concrete Elements with Spatial Tailoring of Concrete Properties
… on the design and performance of reinforced concrete elements constructed with multiple different concrete mixes which are layered in the fresh-state. This approach is called functional layering. It allows for concrete properties to be tailored to spatially varied performance requirements to …
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Utilising Waste Paint and Waste Glass in Concrete
… study which investigated the viability of concrete that utilised waste paint as a replacement for conventional water-reducing and air-entraining admixtures and a partial replacement for mixing water, and crushed waste glass as a partial replacement for natural coarse and fine aggregates. An …
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Analysis of construction loads on concrete formwork
… slabs during the construction of multistory concrete buildings and for determining the lateral pressures imposed by fresh concrete against the wall forms. The procedures assume two-dimensional frame models, which employ both the analysis computer program (CPF) and the maturity-based model. …
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Laminar cracking in post-tensioned concrete nuclear containment buildings
… the long-term integrity of post-tensioned concrete containment buildings (PCCs) is necessary for continued operation of the reactors they house. In 2009, during preparations for a steam generator replacement, extensive subsurface laminar cracking was identified in a portion of the Crystal …
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Time-dependent analysis of cable-stayed bridges
… and generally take a long time to build. In a concrete cable-stayed bridge, concrete properties change with time causing a change in the position of the neutral axis. In different parts of a concrete bridge creep and shrinkage develop at different rates which depend upon various environmental …
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The durability of fly ash concrete in marine and softwater environments
Concrete is attacked by aggressive agents in the marine and softwater environments which reduce the durability of concrete. To help lessen the effect of this aggressive attack, fly ash concrete has been recommended for use in these environments. The lower permeability, increased chemical resistance …
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Biomass and Coal Fly Ash in Concrete: Strength, Durability, Microstructure, Quantitative Kinetics of Pozzolanic Reaction and Alkali Silica Reaction Investigations.
… and environmentally beneficial admixture in concrete production, partially replacing cement. However, strict interpretation of American Society of Testing and Materials (ASTM) and American Concrete Institute (ACI) standards prohibits use of fly ashes from any source other than coal in …
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Dynamic modelling of lightweight high-strength concrete under impact
… studies on modeling of lightweight high-strength concrete (LWHSC) under static and dynamic loadings. A new strain-based damage model is developed based on continuum damage mechanics. The proposed model incorporates the strain rate effects on various concrete properties, such as tensile and …
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Characterization and deterioration detection of Portland cement concrete using electromagnetic waves over a wideband of frequency
… understanding of the effect of Portland cement concrete's (PCC' s) basic properties on its dielectric properties over a wideband of frequency (0.1 MHz-10 GHz). Other parameters that may influence measured dielectric properties were investigated. These include chlorides presence in PCC, …
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Effect of moisture and temperature on the mechanical properties of concrete
Concrete is one of the most widely used building materials. Extensive research was accomplished testing concrete properties including but not limited to modulus of elasticity, compressive strength, tensile strength, and Poisson's ratio using modulus of elasticity and strength testing. The research …
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The evaluation of corrosion inhibitors for the repair and rehabilitation of reinforced concrete bridge components
… inhibitors, surface applied liquids and concrete admixtures, were identified as promising for the repair of reinforced concrete structures subject to chloride induced corrosion. Small scale (1 ft.²) reinforced concrete specimens were cast to evaluate the inhibitors effectiveness. A …
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Strength of welded shear studs
… conducted to study how stud tensile strength and concrete properties affect the strength of shear connections. It is shown that raising the tensile strength of a shear connector actually has an adverse effect on the connector's performance and strength. It is also shown that the upper limit for …
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Exploratory study on high-performance concrete for bridge decks in West Virginia
… the remaining two. Both fresh and hardened concrete properties were evaluated, and the parameters of interest were compressive strength, drying shrinkage, freeze-thaw durability and chloride permeability, which were not affected much by using higher fly ash or slag content. However, when …
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Properties of Western Cape concrete with metakaolin
… contributes to the reduction of cement used in concrete by partially replacing cement with SCMs. However, a challenge arises as to the availability of SCMs. This is mainly because many SCMs such as slag, fly ash, and silica fume are industrial by-products. This means that any fluctuation in the …
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Evaluation of concrete bridge deck overlays
… program, the present study is concerned with the properties of several types of overlay mixtures and the interface bond strengths between them and substrate concrete. All the materials used are of interests to WVDOH. Both fresh and hardened concrete properties of seven different overlay types were …
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Optimization of Concrete Mixtures for Use in Structural Elements
<p>Portland cement is an essential ingredient in concrete. The use of cement is to enhance the strength as well as other hardened properties of concrete mixtures. Determining the accurate amount of cement is important because the required strength may not be achieved if not enough cement is used. …
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Nonlinear time-dependent analysis of externally/internally prestressed reinforced concrete beams
… and/or internally prestressed reinforced concrete beams including the time-dependent effects caused by creep and shrinkage of concrete and relaxation of prestressing steel is presented. The procedure is capable of tracing the structural response of these structures through their service …
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An experimental study of high-performance concrete using metakaolin additive and polymer admixture
… and polymers to produce high-performance concrete. Utilizing a mineral substance as cement replacement in concrete has less environmental pollution and greatly increases the service life of the concrete structures due to improve the most of concrete properties in compared with conventional …
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Zur physikalisch nichtlinearen Analyse von Verbund-Stabtragwerken unter quasi-statischer Langzeitbeanspruchung
… results. The main points of interest are concrete properties like creep, shrinkage, effluent hydration heat, cracking and boundary behaviour between different materials. Material behaviour under load and reload conditions was taken into account as well. The static solution is based on the …
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Cohesive zone modeling of fracture of sustainable and functionally graded concrete
… investigates the fracture process of sustainable concrete, fiber reinforced concrete, and of functionally graded concrete slabs. Both two-dimensional and three-dimensional problems are analyzed. The primary focus of the thesis is on sustainable, functionally graded concrete slabs, emphasizing the …
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