Which one of the following statementsabout concrete is NOT correct?

	A.	Aggregate is added to concrete to reduce the amount of cementrequired.
	B.	Too much water weakens concrete
	C.	Steel is added to concrete to increase its bulk modulus.
	D.	Too little water weakens concrete.

1. Polypropylene is a tough polymer dueto:

   	A.	the entangling of molecular side chains
   	B.	a high degree of crystallinity
   	C.	the strong secondary bond between thepolymer molecules
   	D.	the presence of cross linking between the polymer molecules

2. Which TWO of the following would probably INCREASE the fatiguelife of a metal component?

   		Increase simultaneous corrosion
   		Increase the cyclic stress amplitude
   		Place the component under a mean compressivestress
   		Impose a residual tensile stress within the outer surfacelayer of the component
   		Polish the surface, or otherwise remove surface scratches

Answer rating: 100% (QA)

010 Answer Croption is incorrect Because steel is added ... View the full answer