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Showing 1 to 20 of 58 for “"Concrete mixtures"”.
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Fatigue-fracture relation on asphalt concrete mixtures
… fatigue and fracture parameters for the asphalt mixtures investigated. The study was motivated by the desire to investigate the feasibility of predicting time-consuming fatigue test results with fracture test results, which can be obtained much more rapidly. Based on the results obtained in this …
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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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Compressive Creep of Prestressed Concrete Mixtures With and Without Mineral Admixtures
Concrete experiences volume changes throughout its service life. When loaded, concrete experiences 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 …
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Mix design and testing improvements for 3D printable concrete mixtures with fibers
Vertical concrete construction primarily relies on formwork filled with a flowable concrete mixture. This is simple and effective, but formwork is costly. There has been a recent body of research and small industry in vertical concrete construction using a filament 3D printing technique for small …
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Fatigue Damage Analysis in Asphalt Concrete Mixtures Based Upon Dissipated Energy Concepts
The results of this study provide a foundation for fatigue analysis based on dissipated energy concepts. Using the dissipated energy concepts in fatigue analysis make it possible to account for damage in a straightforward manner. The energy fatigue relation is easy, simple and based on a theory it …
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Investigation of Concrete Mixtures to Reduce Differential Shrinkage Cracking in Composite Bridges
… presented in this thesis was to develop a concrete bridge deck topping mixture that resists the effects of differential shrinkage by decreasing shrinkage and increasing creep. . In addition, the amount of tensile creep that concrete experiences under long-term tensile stresses were …
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Investigating Use of Aggregate Density to Develop Design Aggregate Structure for Asphalt Concrete Mixtures
… was to determine if the aggregate in the asphalt concrete mixture was reaching a dense configuration.;The Bailey Method was used to choose gradations and the selected research methodology supported the evaluation of the Bailey Method as a means for estimating changes in mix volumetric properties …
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Investigation of Concrete Mixtures to Reduce Differential Shrinkage Cracking in Inverted T Beam System
… inverted T-beams finished with a cast-in-place concrete topping. The system offers enhanced performance against reflective cracking and reduces the likelihood of cracking due to time dependent effects. Differential shrinkage is believed to be one of the causes of deck cracking in inverted T-beam …
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Understanding effects of pre-soaked lightweight aggregate on volume stability of mortar and concrete mixtures
… affecting the durability and integrity of concrete structures. This is especially the case for concrete bridge decks due to the large surface-to-volume ratio of these types of structures, which results in a high rate of moisture loss from the exposed surface. An extensive body of literature …
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Nonlinear ultrasonic testing using a non-collinear approach: application to heat treatment of steels and to asphalt concrete mixtures
… used to estimate the level of aging in asphalt concrete mixtures.
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Composition and microstructure of concrete mixtures subjected to biogenic acid corrosion and their role in corrosion prediction of concrete outfall sewers
… Most of these facilities are made of concrete due to its low production costs, versatility, inherent strength and durability under most conditions. However, under certain conditions, sewage that is conveyed through outfall sewers becomes septic and hydrogen sulphide (H2S) gas is …
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Towards performance engineered specifications for high early strength concrete pavement repair applications
Repair materials for concrete applications constitute to this day a topic of great interest for state and local transportation agencies. Repair of concrete highways is necessary whenever there is a distress area that, if not properly addressed, would propagate, ending up reducing the service life …
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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 …
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The Evaluation of Permeable Cementitious Media for Nutrient Removal
… and retention for five permeable reactive concrete mixtures. Additionally, fixed-bed breakthrough experiments were used to determine the nitrate removal for five permeable lightweight cellular concrete mixtures. Finally, one breakthrough experiment was used to determine the nitrate removal …
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Seismic Performance of Self-Consolidating Concrete Bridge Columns
… the seismic performance of self-consolidating concrete (SCC) bridge columns. This study included literature review, experimental evaluation of concrete mixtures, experimental testing of reinforced concrete bridge columns under combined axial loading and lateral load reversals, and analytical …
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Evaluation of Resistivity Meters for Concrete Quality Assurance, Project TR201414
This research evaluated a series of MoDOT concrete mixtures to verify existing relationships between surface resistivity (SR), rapid chloride permeability (RCP), chloride ion diffusion, and the AASHTO penetrability classes. The research also performed a precision and bias evaluation to provide …
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High-volume recycled materials for sustainable transportation infrastructure
… the feasibility of using high performance concrete made with high-volume of recycled materials in transportation infrastructure. The main focus was to develop mixtures for rigid pavement construction. A variety of fine and coarse recycled concrete aggregates (RCA) were investigated. The …
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EFFECTS OF DEICING SALTS ON THE DURABILITY OF CONCRETE INCORPORATING SUPPLEMENTARY CEMENTITIOUS MATERIALS
The durability of concrete mixtures incorporating one of two supplementary cementitious materials (SCMs), slag cement or Class C fly ash, exposed to sodium chloride (NaCl), calcium chloride (CaCl2), or magnesium chloride (MgCl2) is evaluated based on damage due to wetting and drying and scaling, …
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