The rheological properties of fresh concrete are related to cement hydration and chemical interactions in the cement paste system [1]. In addition, the rheological properties of concrete are also dependent on the shape and gradation of the aggregates (coarse and fine) contained in the mixture.
What are rheological properties of polymers? Polymer rheology testing is the study of how the stress in a material or force applied is related to deformation and flow of the material.
Similarly, What is the difference between viscosity and rheology? The key difference between rheology and viscosity is that rheology is the study of the flow of matter, whereas viscosity is a measure of its resistance to deformation. Rheology is a branch of physics or physical chemistry, while viscosity is a quantitative measurement that is useful in chemistry.
What are the factors affecting properties of concrete?
Concrete strength is affected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete.
What are the factors affecting the rheological behavior of concrete?
The rheological properties of concrete are dependent on the factors like mix proportions, consistency, the properties of each ingredient present in the mix, the mixing amount and the admixture amount, the time elapsed after mixing.
What are rheological properties of asphalt?
The aging properties of asphalt binders are normally characterized by measuring physical and rheological properties (e.g. softening point, penetration, viscosity and complex modulus) before and after artificial aging in the laboratory.
What is rheological properties of food? Food rheology is the study of the consistency and flow of food under specified applied forces, to understand the underlying physicochemical principles of ‘structuring’ by food materials and their interaction.
What are rheological properties of bitumen? The rheological properties of bitumen are measured using conventional tests including softening point, viscosity (at 65 o C and 135 o C), elastic recovery (at 25 o C by using a ductilometer), storage stability (penetration point, softening point), flash point and tests after thin film oven ageing (softening point, …
How do you measure rheological properties?
To measure the rheological properties of a material, rheometers are used. They measure the torque and the deflection angle of the measuring bob. This means that in a viscosity measurement the rheometer presets a certain current that correlates to a defined torque.
What are the applications of rheology? Applications. Rheology has applications in materials science, engineering, geophysics, physiology, human biology and pharmaceutics. Materials science is utilized in the production of many industrially important substances, such as cement, paint, and chocolate, which have complex flow characteristics.
What is the most important property of fresh concrete?
The fresh concrete which may be expected to give the best results must possess the property of workability. This is the most important property of fresh concrete. Fresh concrete should be capable of spreading uniformly without inducing any segregation of the aggregates.
What are the 4 main properties of concrete? Hardened concrete has a number of properties, including:
- Mechanical strength, in particular compressive strength. The strength of normal concrete varies between 25 and 40 MPa. …
- Durability. …
- Porosity and density. …
- Fire resistance.
- Thermal and acoustic insulation properties.
- Impact resistance.
Which two materials most affect the strength of concrete?
Factors that Affect the Strength of Concrete
- Water/Cement Ratio. The ratio of the weight of water to the weight of cement is called Water/Cement ratio. …
- Compaction of Concrete. …
- Ingredients of Concrete. …
- Curing of Concrete. …
- The Shape of Aggregate. …
- Maximum Size of Aggregates. …
- Grading of Aggregate. …
- Weather Condition.
How does workability of fresh concrete different from its rheology?
The term Rheology deals with the materials whose flow properties are more complicated than those of simple fluids as liquids and gases. … The Rheology of fresh concrete like workability includes the parameters of stability, mobility and compatibility, which are necessary to determine the suitability of any concrete mix.
How can we prevent concrete segregation? Prevention of segregation
Segregation of concrete can be prevented by correctly proportioning the mix and using the recommended water-cement ratio so as to prevent using excess water. Care should be taken while handling, placing, transporting, compacting and also at finishing stages.
Is concrete rheology important enough to design a mixture around it?
Rheology can be an effective tool for specifying, designing, and managing concrete workability, revealing concrete characteristics that are not indicated by slump alone. Results from different rheometers can be correlated and can be used to describe multiple aspects of workability.
How does the Superpave binder specification relate to performance?
SHRP research developed the Superpave binder specification to be generic, performance based and climate driven. It addresses the pavement distresses of rutting, fatigue, and thermal cracking. Complete testing requires a lengthy process in person-hours and elapsed time.
Is texture a rheological property? Introduction Since foodstuff comes in such a vast variety of structures and textures, the range of rheological methods used to characterize its mechanical properties is even wider. Rheological and texture properties play an important role during the entire life cycle of liquid or solid food formulations.
Is honey a Newtonian fluid?
Honey is an example of a non-Newtonian fluid – a fluid that changes its behavior when under stress or strain.
What are the important of rheology? Researchers believe that rheological characterization is essential for the development, optimization, and processing of foods. Food rheology also determines the food texture. Rheological flow properties deal with the perception of food when we touch or put it into our mouth.
What instrument determines rheological properties of suspension?
A rheometer is a laboratory device used to measure the way in which a liquid, suspension or slurry flows in response to applied forces. It is used for those fluids which cannot be defined by a single value of viscosity and therefore require more parameters to be set and measured than is the case for a viscometer.
Is Surface tension is a rheological property? Surface rheology is a description of the rheological properties of a free surface. When perfectly pure, the interface between fluids usually displays only surface tension.
Is Wet concrete a Newtonian fluid?
Concrete and mortar are composite materials, with aggregates, cement, and water as the main components. Concrete is really a concentrated suspension of solid particles (aggregates) in a viscous liquid (cement paste). … A liquid that obeys this equation is called Newtonian [1].