amassing of fresh concrete

huangyhg

"amassing" of fresh concrete?
hello,
at which α angle we don't need "upper" formwork to avoid "amassing" of fresh concrete?
thanx in advance
ps: hope amassing is the proper word which describe the problem.

check out our whitepaper library.
it would depend on the workability of the concrete mix
angle "alpha" depends on the slump of the concrete mix (and to some degree, the friction between the formwork and the plastic concrete).  the lower the slump, the higher alpha can be.  a practical limit to alpha is about 45 degrees with a slump of zero.
speed of placement also has an effect.  the slower you place the concrete, the less likely "amassing" will be.
thank you ron for this valuable post.
is there a spreadsheet table that describes relation between formwork angle-slump-type of formwork?