For the penetration index （PI） of asphalt binders, which of the following statementis true（）
A. the higher the PI, the greater the penetrationvalue
B. the higher the PI, the less the temperature susceptibility of the asphalt is
C. the higher PI, the greater the temperature susceptibility of the asphalt is
D. PI expresses the temperature susceptibility of asphalt during the mixting process
查看答案
Which choice about the effect of asphaltene on asphalt is correct（）
A. Making the asphalt soft
B. Promoting the adhesion between asphalt and aggregate
C. Improving the high temperature stability of asphalt
D. Increasing the plasticity of asphalt
Compared with ordinary Portland cement, which choice in the following is right as to the composition of Portland cement for road（）
A. It has more C3A and less C4AF
B. It has more C3S and less C3A
C. It has less C3A and more C3S
D. It has less C3A and more C4AF
An aggregate’s voids are filled with moisture but the main surface area of the aggregate particles is dry. Which of the following moisture condition does it belong to（）
A. Bone dry
B. Air dry
C. Saturated surface–dry （SSD）
D. Moist
After some water reducing agent is used into concrete, the function of the agent is（）if some water is reduced
A. to improve concrete mechanics
B. to reduce concrete cost
C. to change concrete workability
D. to increase concrete flowability
微信支付 
支付宝支付