问答题(共30分)
Give a brief introduction on how to improve concrete strength. (8分)
If not required, it is forbidden to add water into the concrete mixture when pouring concrete. Please explain the disadvantages brought by adding water on the concrete quality. (7分)
What is concrete durability? What are the measures taken to improve concrete durability?(10分)
How is petrol asphalt marked? What is the relation between its mark and its technical properties?(5分)
计算题 (共18分)
已知某材料干燥状态时的破坏荷载为240KN,饱水时的破坏荷载为180KN,问该材料是否适合用作经常与水接触的工程部位的结构材料。 (5分)
已知某混凝土的试验室配合比为 C∶S∶G = 1 ∶ 1.92 ∶ 3.97 , W/C = 0.56, 配制 1m3混凝土水泥用量为300Kg 。施工现场砂、石的含水率分别为 5% 和 1% ,求施工配合比。(6分)
某混凝土配合比为 1∶2.43∶ 4.71 , W/C = 0.62 ,设混凝土表观密度为 2400 kg/ m 3 计,求各材料用量。(7分)
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