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.
Results
Showing 1 to 15 of 15 for “"concrete shrinkage"”.
-
Development of Concrete Shrinkage Performance Specifications
During its service life, concrete experiences volume changes. One of the types of deformation experienced by concrete is shrinkage. The four main types of shrinkage associated with concrete are plastic, autogeneous, carbonation and drying shrinkage. The volume changes in concrete due to shrinkage …
-
Frictional resistance of concrete on a geocomposite material
… provided by the underlying layers of a concrete slabs on ground has a large influence on the cracking behavior. To adequately judge the quality of performance of the slabs, it is imperative to investigate the frictional resistance to movement and other relations of the concrete and …
-
Shrinkage of concrete using porous aggregates
During its service life, concrete undergoes volume changes which can affect quality and durability of the concrete. There are several types of volume changes, but shrinkage is the type of volume change which is often responsible for cracking of the concrete. Shrinkage can be categorized due to …
-
Measuring and Modeling the Time-Dependent Response of Cementitious Materials to Internal Stresses
Recent advances in shrinkage modeling have worked toward modeling autogenous and drying shrinkage as mechanical responses to internally applied stresses. In this thesis, previous modeling work is extended such that autogenous shrinkage of cement paste is considered as a viscoelastic response to …
-
Corrosion Assessment for Failed Bridge Deck Closure Pour
Corrosion of reinforcing steel in concrete is a significant problem around the world. In the United States, there are approximately 600,000 bridges. From those bridges 24% are considered structurally deficient or functionally obsolete based on the latest, December 2010, statistic from the Federal …
-
The Role of Reactive MgO as an Expansive Additive in the Shrinkage Reduction of Concrete
… (MgO) has been successfully used in large volume concrete, mainly dam construction in China, for thermal shrinkage reduction since the 1970’s. At ~4% addition to the cement by weight, it is much simpler than conventional shrinkage measures and in particular, reduces the quantity of crack control …
-
Time dependent flexural analysis of reinforced concrete members
Concrete is one of the most widely used building materials in the construction industry in the world. Time dependent behaviour of concrete is the major concern for the structural engineers due to its significant effect in the long term serviceability and durability. Reinforced concrete (RC) members …
-
Modification of crumb rubber cement interface and its effect on strength and viscoelastic properties
… of waste tires in the form of crumb rubber in concrete has been attempted. Previous research work has shown that the inclusion of crumb rubber in concrete results in a drastic decrease in compressive strength due to the incompatibilities between rubber and cement paste. The limitations related …
-
Investigation of Long-Term Prestress Losses in Pretensioned High Performance Concrete Girders
… losses is important in the design of prestressed concrete bridges. Over-predicting prestress losses results in an overly 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 …
-
Numerically Modeling Steel Continuous Bridges for Early Age Concrete Deck Cracking
… two factors, 1) construction practices, and 2) shrinkage. The Arkansas Department of Transportation (ARDOT) has experienced early age bridge deck cracking. ARDOT currently specifies a sequence deck pour on most of their bridges; however, contractors prefer continuous deck pours because of ease …
-
Axial compressive behaviour of FRP-confined high-strength concrete
External confinement of concrete columns with fibre-reinforced polymer (FRP) sheets has been shown to lead to significant improvements on the axial compressive behaviour of these columns. This application of FRP composites is effective as a confinement material for concrete, in both the seismic …
-
Illinois integral abutment bridges: behavior under extreme thermal loading and design recommendations
… that time-dependent behaviors, such as concrete shrinkage, may significantly influence maximum pile stresses for some IABs. Also, shrinkage may induce additional axial loads in the superstructure. Specifically, IABs using PPCI girders may exhibit unusually high contraction displacements …
-
Study of Internal Strains Developed in Concrete Decks at Early Ages in Steel Continuous Bridges
… identified bridge deck cracking shortly after concrete decks are placed and prior to applying traffic loads. Previous researchers have confirmed improper construction practices and design methods can lead to deck cracking. Currently, many contractors throughout Arkansas are using continuous …
-
VLIV ZMĚNY NÁHRADNÍ TLOUŠŤKY PRŮŘEZU NA CHOVÁNÍ BETONOVÝCH KONSTRUKCÍ
Správné určení reologických jevů je značně obtížné, neboť záleží na mnoha vstupních parametrech, např. na stáří betonu, velikosti tělesa, relativní vlhkosti prostředí, pevnosti betonu, rychlosti hydratace cementu, vlivu teploty, druhu namáhání a způsobu ošetřování. Tato dizertační práce se zaměřuje …
-
Self-Compacting Concrete for Prestressed Bridge Girders
Self-consolidating concrete (SCC), which is different from conventional concrete especially in its fresh state, is a highly workable concrete that flows through congested reinforcement under its own weight alone, filling the formwork without segregation of its constituent materials with a void-free …