What are the rheological properties of concrete?

What are the rheological properties of concrete?

Rheological Properties of Concrete: 9 Factors | Concrete Technology

• Factor # 1. Mix Proportion:
• Factor # 2. Consistency:
• Factor # 3. Hardening and Stiffening:
• Factor # 4. Aggregate Shape and Texture:
• Factor # 5. Aggregate Grading:
• Factor # 6. Maximum Size of Aggregate:
• Factor # 7. Admixtures:
• Factor # 8.

What is Bingham model of concrete?

Bingham Model for Rheology of Concrete Concrete is a non-Newtonian fluid whose rheological properties is represented by Bingham model. When we relate with the concrete material, the constant is related to the shear rate at which concrete is measured and the shear history of the same.

What are the factors affecting rheology of concrete?

Factors affecting rheological properties of concrete based on flow characteristics of concrete are: Mix proportions of concrete. Consistency of concrete….Effect of Admixtures on Rheological Properties of Concrete

• Plasticizers.
• Super-plasticizers.
• Accelerators.
• Retarders.
• Air entraining agents.

Which is the main stress we consider in rheology of concrete?

The ability of the concrete fluid mix to flow is defined as its mobility. This mobility is happening by the action of mechanical stresses, which is also called as moment transfer.

How is concrete viscosity measured?

The relative plastic viscosity was calculated for all mixtures by dividing the plastic viscosity of the mixture containing the coarse aggregates or particles with the plastic viscosity of the matrix (mortar or cement paste).

What are the properties that could be studied by the rheology measurement?

The most common rheological properties are yield stress, relaxation times, viscosity and compliance. Rheological properties study the behavior of fluids under mechanical loading. The solid structure, having a defined shape, deforms and stresses when subjected to a load.

How is rheology measured?

To measure the rheology of a fluid, it is necessary to shear it using a known stress and to measure the rate of strain that this generates. This is done through the use of a viscometer into which a sample of fluid is introduced for measurement.

What is a Bingham?

A Bingham plastic is a viscoplastic material that behaves as a rigid body at low stresses but flows as a viscous fluid at high stress. It is named after Eugene C. Bingham who proposed its mathematical form.

What is rheology in cementing?

The study of materials with both solid and fluid characteristics. In well cementing, rheology affects: Cement slurry mixability and pumpability. Cement coverage (mud displacement)

What are the factors affecting properties of concrete?

Factors Affecting Strength of Concrete

• Quality of Raw Materials.
• Water / Cement Ratio.
• Coarse / fine aggregate ratio.
• Aggregate / Cement Ratio.
• Age of concrete.
• Compaction of concrete.
• Temperature.
• Relative humidity.

What are the parameters that influence rheology of a material?

The rheological parameters were viscosity (cp), torque%, shear stress (dyne/cm2) and shear rate (s-1).

What is rheology measurement?

Measurement. Rheometers are instruments used to characterize the rheological properties of materials, typically fluids that are melts or solution. These instruments impose a specific stress field or deformation to the fluid, and monitor the resultant deformation or stress.

What is Bingham viscosity?

What is fluid rheology?

Rheology is defined as the study of the deformation and flow of a fluid. It is an important property of a molten polymer; it relates the viscosity with the temperature and shear rate, and is consequently linked to polymer processability.

What are the two most important factors affecting 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.