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 65 for “"Concrete strength"”.
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Effects of maximum size coarse aggregate and superplasticizer on concrete strength
… on the relationship between accelerated strength and 14-day normally cured strength of normal and superplasticized concrete have been investigated. The results obtained show that differences among maximum size coarse aggregates are greater in normal concrete than in superplasticized …
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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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Mechanical behaviour of adhesive anchors installed in concrete
… behaviour of adhesive anchors installed in concrete. They are the mechanisms of failure, the relationship between applied pull-out'loadand slip of the anchor and the stresses and strains in each of the three components (steel-resin'-concrete). The study is-primarily-experimental--but …
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Carbonation of concrete bridge structures in three South African localities
… the data were therefore grouped according to the concrete strength grade (as a measure of concrete quality) and exposure conditions, prior to statistical analysis. Based on the method of least squares, as well as integration of the understanding of the process of carbonation and knowledge of …
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Engineering properties and structural behaviour of high strength reinforced concrete beams
High Strength Concrete (HSC) has become a viable alternative to lower strength concrete. However, its utilisation is increasing faster than the development of suitable design recommendations. This is because limited and diverse investigations have been carried out concerning engineering properties …
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Shear Behavior of Reinforced Concrete Beams and Prestressed Concrete Beams
"In 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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Design of prestressed, fabric-formed concrete beams
… forms and prestressing are both technologies for concrete structures that allow for less material to do more work. This thesis seeks to assess the feasibility and performance of fabric formed, prestressed beams with a keyhole cross-section, while varying parameters such as concrete strength, …
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Anchorage bond in concrete bases
… to investigate the anchorage bond stresses in concrete bases. In Series I to IV concrete base specimens were loaded and column starter bar strains measured for different supporting conditions of the base. Curves indicating the distribution of steel compressive stresses and bond stresses in the …
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Machine learning for strength prediction and optimal design of sustainable concrete formulas
Given the large environmental impact of the concrete industry, which represents 8- 9% of global CO₂ emissions, the design of concrete mixes with low carbon footprints that still meet structural performance requirements will be an essential part of global decarbonization efforts. In this work, we …
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Behavior and Strength of Welded Stud Shear Connectors
The behavior and strength of welded shear studs are subjects of ongoing study. In recent years, research has shown that the American Institute of Steel Construction (AISC) specification equations for shear stud strength are unconservative for studs placed in deck with ribs transverse to the steel …
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MECHANICAL AND HYDRAULIC CHARACTERIZATION OF PLASTIC CONCRETE
… strain on the hydraulic conductivity of plastic concrete. This experimental investigation was performed using a state of the art Global Digital System (GDS) computer controlled triaxial machine according to ASTM D2166. The GDS Triaxial machine was used to investigate the hydraulic conductivity …
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Load transfer from high-strength concrete columns through lower strength concrete slabs
… were tested 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. …
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An investigation into the effects of early propping removal on the deflection of reinforced concrete beams
… projects as quickly as possible. Reinforced concrete is a popular and widely used construction material. However it has the unfortunate drawback in that the concrete requires time to set and gain sufficient strength before loads may be applied and the formwork and props can be removed. It is …
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Numerical Modelling and Analysis on Structural Behaviour of Composite Slim-Floor Beams
… proposed to predict the load bearing capacity of concrete dowel shear connector. Part 2: Based on test results of shear beams and flexural beams, FE models developed and validated, and parametric studies were carried out. According to FE results, the shear (in a weak cross-section) and bending …
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Corrosion of steel reinforcement in concrete. Corrosion of mild steel bars in concrete and its effect on steel-concrete bond strength.
… environments (saline, alkaline solutions and concrete media) using potentiodynamic polarization technique. The study also included the effect of corrosion on bond strength between reinforcing steel and concrete using pull-out test. Corrosion of mild steel and 316L stainless steel with …
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Behavior of High-Strength Concrete Members under Pure Flexure and Axial-Flexural Loading
… limits its applicability to a maximum concrete compressive strength of 10 ksi (69 MPa). These limitations reflect the lack of research data at the time, rather than the inability of the material to perform its intended function. The present study addresses the need for better …
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Machine Learning Based Prediction of Reinforced Concrete Members’ Shear Friction Capacity
… by which shear forces are transferred across concrete-to-concrete interfaces. Shear transfer across a plane involves a complex interaction of several phenomena, such as concrete surface condition and cohesion, concrete strength, and steel reinforcement strength and reinforcement ratio. …
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Response of reinforced concrete to reverse cyclic loading
… investigates the response of cracked reinforced concrete subjected to reverse cyclic loading with particular emphasize on the contribution from tensile stresses in cracked concrete. An iterative strain compatibility approach using a nonlinear bond stress-slip relationship was implemented into a …
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Response of high strength concrete columns under fire-induced biaxial bending
Reinforced concrete (RC) columns, under fire conditions, can experience biaxial bending which can arise due to eccentricity in loading, uneven spalling, or due to significant thermal gradients generated through 1-, 2-, or 3-sides of fire exposure. High strength concrete (HSC) columns are especially …
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Unbonded Monostrands for Camber Adjustment
Prestressed concrete structural members camber upwards or downwards depending upon the location of application of prestress force. Identical members do not camber equally due to variability of the factors influencing it. Differential camber in the beams, if significant, results in excessively tall …
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