Define the phenomenon of pumping and its effects on rigid pavements.
What will be an ideal response?
Pumping is the discharge of water and subgrade (or subbase) material
through joints, cracks, and along the pavement edge. It is primarily caused by the
repeated deflection of the pavement slab in the presence of accumulated water
beneath it. Pumping action results in a relatively large void space formed
underneath the concrete slab. This results in faulting of the joints and eventually
the formation of transverse cracks or the breaking of the corner of the slab. Joint
faulting and cracking is therefore progressive, since formation of cracks facilitates
the pumping action.
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What are some negative issues with the creation of the Initial Decision Maker (IDM) in the AIA A201-2007 document?
What will be an ideal response?
Which of the following types of cable is suitable for dry locations only?
a. Type NM b. Type TC c. Type UF d. Type USE b. Type TC c. Type UF d. Type USE
Always check the pipe run for sagging; if the pipe sags, add _____.
a. more pipe b. hangers or supports c. weights d. lights
Lateral runout is the side-to-side movement of the rotor and it can be caused by a warped rotor a bent or damaged hub flange, or loose wheel bearings .
Answer the following statement true (T) or false (F)