Flow table test: Difference between revisions

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{{mergeShort description|Concrete slumpconsistency test|date=May 2011}}

[[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.

The '''flow table test''' or '''flow test''' is a method to determine the consistence of fresh [[concrete]].

==Application ==

When fresh concrete is delivered to a site by a truck mixer, itits isconsistency sometimes necessaryneeds to checkbe its consistencechecked before pouringit itis poured into [[formwork]].

If the consistenceconsistency is not correct,at the desired level, concrete will not have the desiredrequired strength and other qualities once it has set, particularly the desired strength. If the concrete is too pasty, itcavities may result in cavitiesform within the concrete which leads toit. [[corrosionRebar]] ofmay thebecome [[rebar]]corroded, eventuallyand leading to the formation of cracks (as the rebar expands as it corrodes) whichconcrete will accelerate the whole process, rather like insufficient [[concrete cover]]crack. Cavities will also lower the stressreduce the concrete is able to supportstrength.

==Equipment==

* Flow table with a huge 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 forto wettingwet the flow table.

* Tamping rod, {{convert|60|cm|in}} long.

==Conducting the test==

* The flowtableflow table is wetted.

* The cone is placed in the center of the flowtableflow table and filled with fresh concrete in two equal layers. Each layer is tamped 2510 times with a tamping rod.

* Wait 30 seconds before lifting the cone.

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

* The flowtableflow table is then lifted up several centimeters40mm and then dropped 15 times, causing the concrete flowto a little bit furtherflow.

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

==See also==

Line 29 ⟶ 30:

* [[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]

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