课程名称︰工程材料学 课程性质︰必修 课程教师︰周中哲 副教授 开课学院：工学院 开课系所︰土木工程学系 考试日期（年月日）︰2010-06-25 考试时限（分钟）：120分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 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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