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起止时间:2021-03-08到2021-06-28
更新状态:每5天更新一次
Chapter 1 Stone and Aggregate Stone and Aggregate
1、 Geologists classify rocks into three basic types: Which one of the below is not the three basic rock types?
A:Sedimentary Rock
B:Igneous Rock
C:Limestone Rock
D:Metamorphic Rock
答案: Limestone Rock
2、 What type of rock is formed when heat and pressure change the composition?
A:Residual
B:Igneous
C:Sedimentary
D:Metamorphic
答案: Metamorphic
3、 What is the demarcation between coarse aggregate and fine aggregate for asphalt material?
A:2.36 mm
B:4.75 mm
C:0.075 mm
D:25.4 mm
答案: 2.36 mm
4、 An aggregate sample has a total density of 1,740 kg/m3 and water content of 15%. The specific gravity of the aggregate is 2.65. What is the dry density of the sample?
A:2,052 kg/m3
B:1,650 g/m3
C:1,513 kg/m3
D:1,432 kg/m3
答案: 1,513 kg/m3
5、 A well-graded aggregate contains:
A:Mostly particles passing the 4.75mm sieve
B:Particle sizes which are primarily within a small band
C:A range of particles sizes that are missing.
D:Particles of all sizes in good distribution
答案: Particles of all sizes in good distribution
6、 An aggregate sample has a moisture content of 8%. How much water must be added to increase the moisture content to 12%? You originally started with 2400 g of aggregate with air-dry moisture content of 3.5%
A:81g
B:91g
C:94g
D:86g
答案: 91g
7、 For an aggregate sample, the percent passing 24.5mm, 9.5mm, 4.75mm, and 2.36 sieves are 100%, 98%, 80%, and 60%, respectively. What is the nominal maximum aggregate size of the sample?
A:2.36mm
B:4.75mm
C:9.5mm
D:24.5mm
答案: 4.75mm
8、 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
答案: Saturated surface–dry (SSD)
9、 The surface chemistry of aggregate can be divided by the content of SiO2. The basic aggregate has SiO2
A:SiO2 ≥ 65%
B:SiO2 ≤52%
C:SiO2 = 52~65%
D:SiO2 = 0%
答案: SiO2 ≤52%
Chapter 2 Portland Cement Portland Cement
1、 The typical ingredient that easily leads to corrosion of hydrated cement is
A:3CaO.SiO.nH2O
B:Ca(OH)2
C:2CaO.SiO.nH2O
D:3CaO.Al2O3.3CaSO4.32H2O
答案: Ca(OH)2
2、 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
答案: It has less C3A and more C4AF
3、 When the slump of fresh concrete does not meet the requirement, the right way to improve workability is
A:Increasing cement paste under same W/C condition
B:Decreasing cement paste under same W/C condition
C:Adjusting cement paste under same W/C condition
D:Increasing or decreasing water quantity
答案: Adjusting cement paste under same W/C condition
4、 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
答案: to change concrete workability
5、 Ordinary Portland cement is not suitable for( )
A:cold region
B:wet environment
C:mass concrete
D:high loading condition
答案: mass concrete
6、 Maximum W/C and minimum cement requirement will affect ( )
A: concrete strength
B:concrete workability
C:concrete durability
D:concrete economy
答案: concrete workability
7、 Which one in the following options might be disadvantage to the initial strength of cement concrete?
A:use blast furnace slag cement
B:gap gradation is used for the cement concrete
C:the cement particle is too fine
D:water reducer is added in the cement concrete
答案: use blast furnace slag cement
8、 Specific amount of water should be used to prepare normal consistency of cement paste, otherwise cement properties would be influenced. Which choice in the following is the corresponding property be affected?
A:The values of compressive and flexural strength
B:Comparability of setting time and volume soundness
C:Release amount of hydration heat
D:Determination of strength grade
答案: Comparability of setting time and volume soundness
9、 Too much free-CaO or free-MgO in cement would lead to ( )
A:inappropriate setting time
B:poor soundness
C:failure to meet strength requirement
D:undesirable workability
答案: poor soundness
Chapter 3 Organic Binders Organic Binders
1、 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
答案: the higher the PI, the less the temperature susceptibility of the asphalt is
2、 The long-term aging of asphalt binders can be simulated using the ( )
A:RTFOT
B: TFOT
C:PAV
D: BBR
答案: PAV
3、 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
答案: Improving the high temperature stability of asphalt
4、 Generally, the asphalt binder with higher viscosity has ( ) penetration,and this kind of asphalt binder is more suitable for ( ) area.
A: Lower, hotter
B:Lower, colder
C:Bigger, hotter
D: Bigger, colder
答案: Lower, hotter
5、 After aging, the penetration of asphalt binder will ( ), the softerning point will ( ), the ductility will ( ).
A: Decrease, decrease, decrease
B: Decrease, increase, increase
C:Increase, increase, increase
D:Decrease, increase, decrease
答案: Decrease, increase, decrease
6、 For the penetration of asphalt binders, which of the following statementis true?
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