Self consolidating concrete spread test
The slump flow test, using the traditional slump cone, is the most common field test and is in the process of being standardized by ASTM.The slump cone is completely filled without consolidation, the cone lifted, and the spread of the concrete measured.Testing of self-consolidating concrete eliminates the need for vibration or other techniques to remove air bubbles and holes.Self-consolidating concrete, when used correctly, was created to avoid this problem and reduces labor, time, and a possible source of technical and quality control issues.This standard does not purport to address all of the safety concerns, if any, associated with its use.It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.The spread (slump flow) of SCC typically ranges from 18 to 32 inches (455 to 810 mm) depending on the requirements for the project.The viscosity, as visually observed by the rate at which concrete spreads, is an important characteristic of plastic SCC and can be controlled when designing the mix to suit the type of application being constructed. give it significant economic, constructability, aesthetic and engineering advantages.
The values stated in either SI units or inch-pound units are to be regarded separately as standard.
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
There are many tools that can be used to measure the fluidity and rapid assessment of static segregation resistance of self-consolidating concrete.
The development of high performance polycarboxylate polymers and viscosity modifiers have made it possible to create “flowing” concrete without compromising durability, cohesiveness, or compressive strength.
The flowability of SCC is measured in terms of spread when using a modified version of the slump test (ASTM C 143).
During the slump flow test, the viscosity of the SCC mixture can be estimated by measuring the time taken for the concrete to reach a spread diameter of 20 inches (500 mm) from the moment the slump cone is lifted up.