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Some Rheological Behaviors of Fresh Cement Pastes

It is the main practical reason for intensive research activities and in this research subfield for a period of 70 years. Concrete can be considered a dispersant of gravel (about 20 mm in diameter) in the mortar, and the mortar can be considered as a dispersant of sand (about 1 mm in diameter) in the cement paste. Therefore, cement paste which is the dispersing agent of cement particles (about 10 micrometers) in water is a liquid medium where aggregate particles (sand and gravel) are scattered.

It is a non-tannin liquid. More specifically, it is thought to be an association between the outward-directed behavior of the cement paste and the performance of the vibration process commonly used during concrete setting.

The hydration reaction of cement starts from the first contact between cement and water and is thought to continue for 10–70 minutes. Arthritis work with fresh cement pasta is expected to face many challenges. Despite the notion that hydration of cement is essentially inhibited during periods of inactivity, additional difficulties associated with gout measurements of cement paste can be identified. Specially,

 

(A) Deviations in the time-dependent viscosity curve are generally reported, which may be due to variable competition between failures caused by shear and build-up of hydration structures when the hysteresis circuit design is altered; (

(B) B) The rheology result depends on the mixing and manipulation of the protocol, possibly due to the reduction of the elastic limit with strong mixing;

(C) the paste sliding on the rotor wall can certainly be overcome with a rough surface, but the extent cannot be determined; and

 

(D) Particle deposition may be negligible during measurement when worm wheels or the like are used, or when the water/cement ratio is kept below 0.4 by conventional geometry. All The above mentioned problems can be defeated with a good experimental design, but plug flow due to the presence of various pressures in the material mass, some with values ​​below the elastic limit, is described as an unsolved problem.

 

Generally, this is due to various factors and conditions that influence the reaction of the substance. We can include physical factors such as the water/cement ratio or the morphology of the cement particles, mineralogy factors such as the composition of the cement,chemical factors such as structural changes due to hydration processes, mixing conditions such as type of stirrer or measurement conditions such as experimental procedures.

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