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材料员考试新闻材料员考试辅导

材料员试题练习74

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摘要:材料员,试题,练习,材料员,考试,试题,练习,问答,30分,
 
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材料员考试试题练习74

问答题(共30分)
The following measures can be taken to improve concrete strength
(1) Use high strength cement (1分)
(2) Reduce W/C as small as possible (1分)
(3) Use clean sand and scree with excellent gradation. It is recommended to use small grain size scree in high strength concrete. (2分)
(4) Use high efficient water-reducing admixture and mineral admixture. Hardening acceleratorcan be used to improve early strength. (2分)
(5) Keep proper temperature and higher humidity for curing. It also can be cured in humid and hot condition (steam cure) to improve the early strength. (2分)

When pouring site cast concrete, the added water in the concrete mixture will improve its mobility but reduce the viscidity and saturation. As W/C increases, the concrete strength and durability will be reduced for the increasing voidage, and it also causes the deformation and affects the construction quality. Therefore, If not required, it is forbidden to add water into the concrete mixture when pouring site cast concrete (7分)

Durability is proposed for the description of concrete ability in resisting environment and medium influence and maintaining good utility properties. The following steps can be taken to enhance its durability:(1) select cement type according to the specific construction environment and properties. (2分)
(2) set W/C and use cement properly. W/C is the decisive factor in concrete solidity. Strictly control the maximum W/C and guarantee the plentiful usage of cement (2分)
(3) select excellent crushed stones and crude aggregates. Improve the fine and crude aggregates gradation. Select the crude aggregates with larger diameter within the permitted diameter ranges. Reduce aggregates voidage and specific surface area. (2分)
(4) Use air entraining admixture and water reducing admixture to improve the anti-permeability and frost-resistance ability. (2分)
(5) Enforce the construction quality control (2分)
Petrol asphalt can be marked by penetration degree. The mark number is roughly the average penetration degree. The relation between the ordinary construction petrol asphalt and its properties is the higher the mark is, the smaller the viscosity is (the larger penetration degree), the higher the plasticity (the larger the ductility is), the lower the temperature stability (the lower the softening point is). (5分)

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