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 4800 for “"concrete"”.
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Concrete Rheology
The rheology of concrete is investigated in this work. The method involves using a partial experimental matrix that considers the effects of sand content, water/cement ratio, coarse aggregate type, fly ash content and the addition of a superplasticizer on the rheological parameters of yield stress, …
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Abrasion resistance of concrete and the use of high performance concrete for concrete railway crossties
… project focused on the abrasion resistance of concrete railway crossties. In the first phase of this project, a series of high performance concrete mixes was developed that utilized different replacement levels of portland cement by silica fume (3%, 7% and 15%), class F fly ash (18%) and slag …
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FIRE RESISTANCE OF CONCRETE-FILLED AND REINFORCED CONCRETE COLUMNS
… for calculating the temperature history of concrete-filled square steel and cylindrical reinforced concrete columns. Two mathematical models and their related computer programs for these columns are presented in this dissertation.</p><p>Furthermore, the Division of Building Research of the …
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Vibration based performance assessment of concrete-concrete composite bridges
Concrete composites consisting of precast pre-stressed standardized beams and a cast in-situ deck slab have been used for the construction of short to medium span bridges for the past four decades in South Africa and worldwide. The pre-cast beams and cast in-situ slab are commonly connected using …
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Concrete microstructure homogenization technique with application to model concrete serviceability
Conventionally, mechanical properties of concrete are attained through experiment by leaving microstructural phases interaction in a black box. To fully understand concrete, it is necessary to bridge the gap between microstructure and macro properties. In this dissertation, with several models …
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Effect of concrete heterogeneity on FRP-to-concrete bond behaviour
… to their various advantages. In FRP-strengthened concrete structure, one of the main failure modes is the premature bond failure, which prevents the exploitation of the full capacity of FRP strengthening, and leads to brittle performance of the strengthened structure. As a result, the bond …
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Concrete at high temperatures: hygro-thermo-mechanical degradation of concrete
… investigate thermo-hygro-mechanical behaviour of concrete, especially under severe heating conditions. The work focuses on the development and extension of an existing analytical, numerical and constitutive model developed at the University of Glasgow. This is then used as a predictive modelling …
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Low Cycle Fatigue Behavior of Concrete with Recycled Concrete Aggregates
<p>A comparison of concrete containing recycled concrete coarse aggregates and natural coarse aggregates subjected to high strain, low cycle compressive fatigue is presented. Using a strain based feedback control loop, concrete cylinders are compressed at 15µε/s to a specified strain then unloaded …
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Shear Behavior of Reinforced Concrete Beams and Prestressed Concrete Beams
… the last decades, developments in high-strength concrete materials are rapid, but codes of practice still limits the concrete compressive strength in design of concrete structures due to a lack of experimental research data. As an effort to overcome the limitation to the use of high strength …
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Geomorphic Concrete : Material and fabrication strategies for heterogeneous concrete morphology
… of the future. This thesis introduces geomorphic concrete, an alternative design approach and construction methodology closely aligned with geological formation process by incorporating natural forces as collaborators in concrete fabrication. Geomorphic concrete is an alternate paradigm of …
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Fracture of concrete
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1967.
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From Foamed Concrete to Geopolymer Foamed Concrete: Design, Properties and Application
L'abstract è presente nell'allegato / the abstract is in the attachment
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The "greening" of the concrete industry : factors contributing to sustainable concrete
… of materials, construction, and maintenance, concrete has emerged as the material of choice for new construction in the 20th and 21st centuries. With over 10 billion tons of concrete being produced annually, the concrete industry is the largest consumer of natural resources and one of the …
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Horizontal Shear Transfer Between Ultra High Performance Concrete And Lightweight Concrete
Ultra high performance concrete, specifically Ductal® concrete, has begun to revolutionize the bridge design industry. This extremely high strength material has given smaller composite sections the ability to carry larger loads. As the forces being transferred through composite members are …
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Seismic Performance of Prestressed Concrete Piles In Cip Reinforced Concrete Pile Caps
… piles in cast-in-place (CIP) reinforced concrete bent caps subjected to seismic loading is not well understood. Current standard SCDOT connection details require the plain embedment of the pile into the bent cap one pile diameter with a construction tolerance of ± 6 inches. To better …
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Load transfer from high-strength concrete columns through lower strength concrete slabs
… to investigate the effects on high strength concrete columns due to the presence of ordinary strength floor concrete layer in between. The specimens consisted of four sandwiched type of columns and two edge columns. The four columns, 55 in. long, had a 7 in. layer of floor concrete. These …
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Radiation effects on concrete
Digitized by Kansas Correctional Industries
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