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 41 for “"Creep and Shrinkage"”.
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Early age creep and shrinkage of emerging concrete materials
Concrete pavements and structures are especially vulnerable to cracking at early age. The volumetric instability of concrete at early age is a frequent cause of cracking. The primary components of volume change are external drying shrinkage, autogenous shrinkage, and thermal dilation. When concrete …
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Creep and Shrinkage of a High Strength Concrete Mixture
… deformations that must be considered in design. Creep is defined as the time-dependent deformation resulting from a sustained stress. Shrinkage deformation is the time-dependent strain that occurs in the absence of an applied load. The total strain of a concrete specimen is the sum of elastic, …
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Creep and Shrinkage Effects on Steel-Concrete Composite Beams
… information on material properties related to creep and shrinkage is not straightforward and because it is not easy to clearly determine the correlation between the effects of creep and shrinkage and the resultant structural response. Slip occurring at the interface between the steel and …
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The effect of carbonation on creep and shrinkage on Portland cement concrete
… of Technology, Dept. of Building Engineering and Construction, 1961.
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An experimental study of creep and shrinkage of exposed limestone aggregate concrete
This thesis presents an experimental study of creep and shrinkage of concrete made from local limestone aggregate and type III cement. The cylindrical test specimens were exposed to the atmosphere in order to observe the effects that variations of temperature and relative humidity had upon creep …
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Effects of creep and shrinkage on the behavior of reinforced concrete gable roof hyperbolic-paraboloids
… load; in addition, concrete shrinks when drying, and consequently, stress redistributions due to geometric changes take place. It therefore follows that reinforced concrete shells built in certain configurations may experience problems due to time deformations.
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Investigation of Long-Term Prestress Losses in Pretensioned High Performance Concrete Girders
… conservative design for service load stresses, and under-predicting prestress losses, can result in cracking at service loads. Creep and shrinkage produce the most significant time-dependent effect on prestress losses, and research has shown that high performance and high strength concretes (HPC …
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Macro and nanocreep of self-consolidating concrete
… been growing interest in using SCC in precast and prestressed applications. These applications are known to be sensitive to time-dependent phenomena such as creep and shrinkage. Therefore, it is important to understand the creep and shrinkage behavior of SCC compared with other types of …
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Long-Term Monitoring and Evaluation of the Varina-Enon Bridge
… structures, the prestress losses due to creep and shrinkage can cause serviceability issues and can reduce flexural capacity. The Varina-Enon Bridge is a cable-stayed, precast, segmental, post-tensioned box girder bridge located in Richmond, Virginia. Observation of flexural cracks in the …
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Time-dependent analysis of cable-stayed bridges
… using the cantilever method of construction 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 …
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Creep, shrinkage and elastic strains in a prestressed concrete bridge : theoretical and actual
… of this thesis is "To investigate the actual creep, shrinkage and elastic strains in a prestressed concrete bridge and to compare these with the results of creep and shrinkage tests carried out in the laboratory in accordance with ASTM C512 Specification on concrete cylinders made using the …
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Investigation of Time-Dependent Deflection in Long Span, High Strength, Prestressed Concrete Bridge Beams
… to all parties involved in bridge design and construction. Many current prestress loss prediction methods, necessary for proper camber calculation, were developed many years ago and are predicated on assumptions that may no longer be valid as higher strength concrete, wider beam spacing, …
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Compressive Creep of Prestressed Concrete Mixtures With and Without Mineral Admixtures
… an instantaneous recoverable elastic deformation and a slow inelastic deformation called creep. Creep of concrete is composed of two components, basic creep, or deformation under load without moisture loss and drying creep, or deformation under drying conditions only. Deformation of concrete in …
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Construction and Behavior of Precast Bridge Deck Panel Systems
… Laboratory to examine constructability issues, creep and shrinkage behavior, and strength and fatigue performance of transverse joints, different types of shear connectors, and different shear pocket spacings. The bridge consisted of two AASHTO type II girders, 40 ft long and simply supported, …
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Crash Analysis of Degraded Concrete Containment Structures
… structures made of an inner steel liner and a concrete outerpack that houses the basket of the spent nuclear fuel bundle. The concrete of dry cask structures will degrade due to the natural aging and the environmental effect shrinkage, creep, heat transfer, moisture diffusion, and …
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Self-Compacting Concrete for Prestressed Bridge Girders
… materials with a void-free structure, and can be placed without any vibration. Self-consolidating concrete was first developed in Japan in the early 1980s, and the main issues that promoted the development of SCC were the shortage of skilled labor and the emergence of heavily reinforced …
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Continuity of bridges composed of simple-span precast prestressed concrete girders made continuous
… girders made continuous via cast-in-place decks and diaphragms are continuous only for live loads and superimposed dead loads. The continuity diaphragms often crack due to time dependent effects in the girders. These cracks not only impair bridge ascetics and durability, but also reduce "degree …
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Recommendations for Longitudinal Post-Tensioning in Full-Depth Precast Concrete Bridge Deck Panels
… keep the precast bridge deck in compression and avoid problems such as leaking, cracking, spalling, and subsequent rusting on the beams at the transverse panel joints. Current design recommendations suggest levels of initial compression for precast concrete decks in a very limited number of …
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A Compilation of Research on Self-Consolidating Concrete for Prestressed Bridge Girders
… procedures by freely flowing, filling space and passing through dense reinforcement without vibration mechanism. Meanwhile, SCC has also been used in other applications such as the precast industry, where the benefits of the workability SCC delivers can be utilized to improve fabrication of …
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