Section 3 Flashcards
When concrete contains aggregate larger than allowed for the slump test, the larger aggregate must be______
wet screened over 1.5” sieve
the mold for making a slump test is in the shape of _____
the frustum of a cone
the height of the slump mold is
12 in
true or false: the interior surface of the slump mold is allowed to have minor irregularities
false
for use in the slump test, the sampling end or both ends of the tamping rod must be
rounded to a hemispherical end
true or false: the slump mold should be in a dry condition before beginning test
false
the surface on which the slump mold will be placed must be
flat, level, damp, non absorbent, and rigid
the slump mold is filled in how many layers
3
each layer of the slump test should fill about ____ of the volume
1/3 of the volume
rod each layer _____ times uniformly over the cross section with the rounded end of the rod
25
How deep should the tamping rod penetrate into the layer below ?
through top most layer and 1 inch into previous layer
What must be done if the concrete drops below the top the slump mold while the top layer is being rodded?
add additional concrete to keep excess above the mold at all times
prior to lifting the mold, concrete must be removed from
the area surrounding the base of the mold
true or false: after the final rodding the sides of the slump mold should be tapped lightly with the tamping rod
false
true or false when raising the slump mold it should not be rotated or twisted
true
