Flow table test: Difference between revisions

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{{Short description|Concrete consistency test}}

[[Image:Flow Test Equipment.JPG|thumb|300px|Equipment; flow table, Abrams cone, waterbucketwater bucket and broom.]]

[[Image:Flow Test before.JPG|thumb|300px|The cone filled with concrete, prior to lifting.]]

[[Image:Flow Test after.JPG|thumb|300px|The diameter of the resulting flow is measured.]]

The '''flow table test''' or '''slump-flow test''' is a method to determine consistency of fresh [[concrete]]. '''Flow table test''' is also used to identify transportable moisture limit of solid bulk cargoes.<ref>{{cite web|url=http://tmltesting.com/w/index.php?title=Flow_Table_Test|title=Flow Table Test - TML Testing Wiki|website=tmltesting.com|access-date=2015-06-11|archive-url=https://web.archive.org/web/20170501222131/http://tmltesting.com/w/index.php?title=Flow_Table_Test|archive-date=2017-05-01|url-status=dead}}</ref> It is used primarily for assessing concrete that is too fluid (workable) to be measured using the [[Concrete slump test|slump test]], because the concrete will not retain its shape when the cone is removed.

==Application ==

When fresh concrete is delivered to a site by a truck mixer, its consistency needs to be checked before it is poured into [[formwork]].

If consistency is not at the desired level, concrete will not have the required strength and other qualities once it has set. If concrete is too pasty, cavities may form within it. [[Rebar]] may become corrededcorroded, and concrete will crack. Cavities will also lowerreduce the level of stress concrete can supportstrength.

==Equipment==

* Flow table with a grip and a hinge, {{convert|70|cm|in}} square. In the American version of this test, the table is {{convert|10|in|cm}} diameter per {{Citation |title=ASTM C 230|url=http://www.astm.org/Standards/C230.htm}}.

* Abrams cone, open at the top and at the bottom - {{convert|30|cm|in}} high, {{convert|17|cm|in}} top diameter, {{convert|25|cm|in}} base diameter.

* Water bucket and broom to wet the flow table.

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* The cone is lifted, allowing the concrete to flow.

* The flow table is then lifted up 40mm and then dropped 15 times, causing the concrete to flow.

* After this the diameter of flow of the concrete is measured.

==See also==

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* [[Self-consolidating concrete]]

==References==

==Links and Sources==

{{Reflist}}

==External links and sources==

*DIN EN 12350-5

*{{Citation |title=ASTM C 1437 - 15|url=http://www.astm.org/Standards/C1437.htm}} Standard Test Method for Flow of Hydraulic Cement Mortar

*[http://www.b-i-m.de/lexikon/INHALT/ausbreitv.htm b-i-m] (German)

*[http://www.betontechnischedaten.de/Kapitel11/11_1.htm#Anchor2 Heidelberg Cement] (German)

*[https://web.archive.org/web/20060928004151/http://www.controls.it/products.php?code=43&page=Workability_&_consistency&product=61&prod_name=Flow_table Concrete Flow Table in an online shop]

{{Concrete navbox}}

==References==

{{Reflist}}

[[Category:Concrete testing techniques]]