課程名稱︰工程材料學
課程性質︰必修
課程教師︰周中哲 副教授
開課學院：工學院
開課系所︰土木工程學系
考試日期（年月日）︰2010-06-25
考試時限（分鐘）：120分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
I True or False (30) [Right: plus two points; Wrong: minus two points; No
Answer: no points]
1. Three primary constituents of the raw material used in the manufacture
of Portland cement are Lime, Silica and Alumina.
2. The compressive strain corresponding to the specified 28-day concrete
conpressive strength is about 0.002.
3. For normal-weight concrete, the concrete is composed of cement paste by
about 60~70% of its volume.
4. When high early strength of concrete is required, type III of Portland
cement should be used.
5. The main purpose of adding reinforcing bars in concrete is to increase
concrete compression capacity.
6. The same concrete strength cannot be maintained when the cement-aggregate
proportions are varied, while keeping the water-to-cement ratio unchange.
7. Slip cretical strength of the bolt connection is dependent on the bolt
bearing capacity.
8. The ASTM A572 Gr. 50 Steel has the ultimate strength 50 ksi.
9. Steel is an alloy consisting mostly of iron, with a carbon content between
0.2% and 2.1% by weight, depending on the grade.
10.A steel shape of W24×100 has the depth about 100 inches.
11.Charpy V-notch test is used to determine the ductility of steel.
12.Cementite (Fe3C) is found in high-carbon steel and has 93.3% carbon and
6.7% iron.
13.The elastic modulus of composite material is larger in the fiber direction
than transverse to the fiber direction.
14.The E-glass fiber has the specific gravity similar to the steel.
15.When the fiber length is smaller then its critical length, the composite
is classified as the particulate composite.
Ⅱ Explanation (50) [Explain as clear as possible]
1. What are the precast concrete and fiber-reinforced concrete? (10)
2. Explain the behaviors of creep and shrinkage in concrete. (10)
3. Describe the steelmaking process. (10)
4. Describe the arc welding process. (10)
5. Describe the pultrusion process for makinf composite structure. (10)
Ⅲ Computation (20)
1. Please derive the Young's Modulus of composite along the fiber direction
and reansverse to the fiber direction. The volume fraction of the matrix
and fiber phases is Vm and Vf, respectively. The modulus of elasticity for
matrix and fiber phases is Em and Ef, respctively. The fiber has the same
length as the matrix in the composite material.
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