CE 200 Materials LAB Final Quiz 2 - PCC and Wood (Latest update), Questions and answers with Complete Solutions

CE 200 Materials LAB Final Quiz 2 - PCC and Wood (Latest update), Questions and answers with Complete Solutions

When conducting the slump test in the laboratory — in accordance to ASTM C
143, "Standard Test Method for Slump of Hydraulic-Cement Concrete" — it was
required to rod (25 strokes for every one of the three layers) the PCC in the
frustum of the cone (the slump test cone or mold) prior to measuring the slump,
primarily, so as to: - ✔✔- Compact the freshly mixed portland cement concrete
(PCC) in the frustum of the cone mold
Why do you pound the PCC 25 times (for every 1 of 3 layers) in the frustum with
a rod during the slump test? - ✔✔- To compact the PCC into the cone mold
frustum of a cone - ✔✔- formed by cutting the top off of a cone with a cut parallel
to the base.
The mold for making the slump test is in the shape of : - ✔✔- Frustum of a Cone
Slump Test - ✔✔- A test for mixed concrete to determine consistency and
workability.
You wet the frustum of the cone during Slump Test so as to: - ✔✔- Provide a
lubricating effect so that the PCC doesn't stick to the mold when pulled upward
When testing the timber specimen in compression parallel to the grain, a
significant deviation from the procedures prescribed in ASTM D 143, "Standard
Test Methods for Small Clear Specimens of Timber," was: - ✔✔- Not using a
displacement-controlled loading scheme (e.g., inch/minute)
The clear-grade Douglas fir timber specimen tested in the CE 200L laboratory in
shear parallel to the grain would have been stronger if : - ✔✔- Instead, it had
been tested perpendicular to the grain