Rheological model for self consolidating concrete
28-Feb-2020 11:59
They provide indication on the static and dynamic segregation resistance of an SCC as well as its ability to flow through reinforcements.
They are frequently used in the field as acceptance test methods.
Therefore, numerous test methods have been developed for SCC with ease of use in mind.
None of these test methods measures yield stress or viscosity, but they all simulate more or less real-scale casting environments.
In addition, that earlier type of concrete was not used in civil engineering structures with normal durability requirements because they either contained too much water or were not stable and led to unacceptable heterogeneity in the structure.
• Reduction of the coarse aggregate content in order to reduce the friction, or the frequency of collisions between them, increasing the overall concrete fluidity; • Increasing the paste content to further increase fluidity; • Managing the paste viscosity to reduce the risk of aggregate blocking when the concrete flows through obstacles.
However, the performance criterion remains the only objective means to evaluate the adequacy of an SCC mix.
By developing concrete that self-consolidates, he eliminated the main cause for the poor durability performance of their concrete.ASTM Committee C09 on Concrete and Concrete Aggregates undertook this task in June 2001 in its Subcommittee C09.47 on Self-Consolidating Concrete.Exploratory work has looked at existing SCC characterization procedures around the world.This procedure, which is readily used today, relies on the use of the Abram’s cone (Figure 1).
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The cone is filled in one layer without rodding and the diameter, instead of the slump of the concrete sample, is measured after the cone has been lifted .(1) In 1997, a RILEM committee (TC 174) on SCC was founded.
