The ease with which one can use concrete is called workability. It is one of the physical parameters of concrete which affects the finesse, strength and durability. Here’s how you can check the workability of your concrete.
For everyones benefit, acceptable safe slump for reinforced foundation walls/footings/pavement 25-80mm, beams/columns 25-80mm, slab 50-100mm, piling 100-150mm. Beyond these values are not safe.
I get that but what are the dangers when contractors the slump test fails and contractors use it anyways. I say this because many contractors provide shotty work. In what ways does it effect the integrity of the concrete? Are their any telling signs?
Aside from affecting ease of work (pouring using pumpcrete tend to be difficult if slump is too low), it may result to severe honeycombing on structural members, reducing integrity of the structure.
Hello, We are happy you found this useful. For more information on home building you can visit our RU-vid channel ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-71PJC4j1FHU.html . Regards, Team UltraTech.
Hello, We are happy you found this useful. For more information on the home building, you can visit our RU-vid channel - ru-vid.com Regards, Team UltraTech
ATSM C143: "Immediately remove the mold by raising the mold in a steady, vertical direction. *** There should be no lateral or torsional motion of the mold while lifting. ***"
We are happy you found this useful. For more information on the home building, you can visit our RU-vid channel - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-71PJC4j1FHU.html. Regards, Team UltraTech
Hi Michael, We are happy you found this useful. For more information on the home building, you can visit our RU-vid channel bit.ly/3kimz2w. Regards, Team UltraTech.
ok.. what causes shear and collapsible slump and is it best for lantern or beams..because concrete needs for such work should be collapsible so that it may fill up all air bubbles in concrete
Hi Abid, Thank you for your query. Our experts will answer your question shortly. Meanwhile, you can watch homebuilding-related videos here - ru-vid.com Regards, Team UltraTech
Hello, We would like to inform you that shear or collapse slumps in concrete are due to the majorly wrong proportioning of aggregates, higher water-cement ratio, and maybe the wrong dosage of admixture. Hope this solves your query. Regards, Team UltraTech
In Australia for normal concrete we mix 20mpa 20mm aggregate 80 mm slump when it is being tested . A wetting agent can be added after the test to make the concrete easier to work .
Hello Ngeth, we are glad you like our video. You can always visit www.ultratechcement.com for more such videos and information. Regards, Team UltraTech.
Hi Siva, Slump is a test to understand the Workability of Concrete. A cylinder may not just slump, it might also fall apart due to a lack of cohesion. The angle ( called the angle of repose) is the steepest at which the sand grains don't slide down the hill. This limiting point is the same all the way down the pile and that's the angle of the cone & that's the reason slump cones are conical. Regards, Team UltraTech
walal seetahey good job hadan halkan wax ka baraneysid ila soo xiriir hada u baahatid in si fcn usii fahantid.Hadii ad ACI test sameyneysid ninkan qaabkisa ha raacin waayo waa khalad waadna ku dhaceysa taas ogow.
The slump cone shall be removed by raising it vertically, slowly and carefully, in two to five seconds, in such a manner as to impart minimum lateral or torsional movement to the concrete. (extracted from Construction Standard of HKSAR) You guys did twist the cone
every layer should be tamped 25 times, not stroked 25 times. Tamping method is wrong. This is the common mistake in most of the sites. At least ultratech should do properly.
