1. What is the real name of disodium edetate?
(Disodium EDTA)
2. What indicators are used to describe the consistency of soil in highway engineering?
(Shrinkage limit, plastic limit, liquid limit, plastic index, liquid index)
3. When measuring soil water content, which two parts of water content are mainly measured?
(weakly bound water and free water)
4. In engineering, we attach great importance to the expansion of soil. China has determined a discriminant index and two discriminant reference indexes to discriminate expansive soil. Please tell us what these three indicators are.
(Free expansion rate, liquid limit and liquid index)
5. In general, the greater the water-cement ratio of concrete, how does its strength change?
(smaller)
6. Impervious concrete refers to the concrete with impermeability grade equal to or greater than how many grades?
(P6)
7. What reagents are needed to determine the effective calcium oxide content of various limes?
Answer: sucrose (analytically pure), phenolphthalein indicator, 0. 1% methyl orange aqueous solution, 0.5mol hydrochloric acid standard solution.
8. When there is no loss of sand particles in the aggregate screening test, and the difference between the sum of the retained masses on each screen and the total mass of the sample is not more than 65438 0%, what particle size can the difference be regarded as?
(less than 0.075 mm)
9. What is the limit of chloride ion content in cement?
(0.06%)
What is the tensile strength of 10 and HRB335 steel bars?
(455 MPa)
1 1, what should be used for the bottom die when making masonry mortar specimens?
(Ordinary clay brick)
12, what is the difference between the parallel test results of asphalt solubility?
(0. 1%)
13, what is the abbreviation of asphalt rotating film heating test?
(RTFOT)
14. what is the solvent used for wax precipitation in asphalt wax content test?
(Ether-ethanol mixture, volume ratio 1: 1)
15. In the Brinell rotational viscosity test of asphalt, what range should the torque reading be?
( 10%-98%)
16. how long should the sample be stretched before it stops stretching during the asphalt elastic recovery test?
(10cm)
17. in the test of polishing value of coarse aggregate, how many hours should the rubber wheel for newly grinding emery be pre-ground before use?
(6 hours)
18. What kind of sand should be polished when testing the polishing value of coarse aggregate?
(Coarse Sand Polishing)
19. What are the main sampling items of on-site mixing asphalt mixture?
Answer: Asphalt content, mineral aggregate gradation, density, stability and flow value.
20. How many methods are there for direct shear test?
Answer: Slow shear, quick shear for consolidation, quick shear.
2 1. In the trial mixing of cement concrete mixture ratio design, it was found that the slump could not meet the requirements. How to adjust at this time?
Answer: The dosage of cement slurry should be adjusted while keeping the water-cement ratio unchanged until it meets the requirements.
22, slump is less than how much of the fresh concrete, with Weber consistency meter to determine its workability?
Answer:10mm
23. The adhesion test between asphalt and mineral aggregate is used to evaluate aggregate performance?
Answer: Anti-water stripping.
24. Under what conditions should the water content of cement stabilized soil be dried?
Answer: Heat it to 105- 1 10℃ in advance and dry it.
25. How to deal with the compressive strength of cement mortar?
Answer: The arithmetic average of six compressive strengths obtained from a group of three specimens is the test result. If one of the six measured values exceeds 10% of the six average values, the result will be invalid, and the average values of the other five results will be taken as the result; If the average value of the five results exceeds 10% of the five measured values, the test results are invalid.
26, the fineness of portland cement and ordinary portland cement?
(Specific surface area)
27, the determination method of dry consistency of cement concrete.
(Weber method)
28, petroleum asphalt dehydration temperature should not exceed how many degrees?
(Not exceeding the softening point 100℃)
29, asphalt ductility test, such as found that asphalt wire floating on the water, what should be added to the water?
(alcohol)
30, asphalt softening point test If the softening point is greater than 80℃, what material should be used as the medium? (glycerol)
3 1. What is the mass ratio of glycerol to talcum powder in the glycerol talcum powder isolator for asphalt test?
(2: 1)
32. In the adhesion test of asphalt and coarse aggregate, when a small part of asphalt film is moved by water, the thickness is uneven, and the percentage of peeling area is less than 10%, the adhesion grade is?
(Level 4)
33, emulsified asphalt test should pass what screen?
(1.18mm)
34, Marshall large specimen height should reach what standard?
(95.3 2.5 mm)
35, coarse aggregate weak particle test 4.75 mm ~ 9.5 mm sample should add how much load? (0. 15kN)
36, water content test, organic matter content is greater than 5% of the soil, drying temperature should be controlled between how many degrees?
(65℃~70℃)
37. What are the factors that determine the quality of each sample in the sand and gravel screening test?
(Nominal particle size of sand and gravel materials)
38. The boiling method of stability test is mainly to test whether cement contains excessive what?
(free calcium oxide)
39. What is the loading speed of asphalt mixture stability test piece?
(50 mm/min)
40. When determining raw materials, what is the decisive factor affecting the strength of concrete?
(water cement ratio)
The purpose of 4 1 and triaxial compression test is to determine which two shear strength parameters of soil according to Mohr-Coulomb failure criterion?
(Cohesion and Internal Friction Angle)
42, in the engineering properties of soil, what are the three physical properties of soil test indicators?
(Water content, wet density, specific gravity)
43. The unconfined compressive strength test of soil, what is the meaning of unconfined?
(Since the lateral pressure is zero, the test only applies vertical pressure to the sample. )
44, using hydrostatic balance to determine the apparent density of coarse aggregate test temperature should be 15~25℃, during the test temperature fluctuation should not exceed how much?
A: 2 degrees Celsius.
45. What is the load grade of consolidation test?
Answer: 50KPa, 100KPa, 300Kpa.
46, asphalt ductility sample preparation needs to use glycerin talcum powder isolation agent, the current test procedures suggested preparation ratio is?
Answer: glycerol: talcum powder = 2: 1.
47. For the same material source, when the maximum particle size of aggregate is both greater than and less than 13.2mm, the adhesion test between asphalt and aggregate should be based on the boiling test of the aggregate.
Answer: More than13.2mm.
48. In the design of asphalt mixture ratio, what are the two mass ratios of asphalt content?
Answer: The quality of asphalt and the quality of asphalt mixture.
49. What is the boundary particle size of coarse aggregate and fine aggregate of asphalt mixture? What is the limit particle size of coarse aggregate and fine aggregate of cement concrete?
Answer: 2.36 mm 4.75 mm
50. In the apparent density test of coarse aggregate, the sample should be soaked for 24h. what is the purpose?
Answer: Remove air with open pores.
5 1. In the adhesion test between asphalt and coarse aggregate, what screen should the aggregate pass through in the boiling test and in the soaking test?
a: 13.2- 19mm； 9.5- 13.2 mm
52. In the determination of available calcium oxide, add phenolphthalein indicator to the sample solution. What color is the solution?
A: Pink.
53. Portland cement should be transported and stored according to national standards. How long does it take to recheck the cement?
A: Three months.
54. In the cement fineness test, if the negative pressure sieve method and the water sieve method are controversial, which method shall prevail?
A: Negative pressure screening method.
55. Soil with more than 5% organic matter is being tested for water content. What is the temperature of drying conditions? C
(65-70℃)
56. What are the three basic parameters that determine the concrete mixture ratio?
Answer: W/C, sand ratio and water consumption w.
57 .. What is the basis for determining the strength grade of cement concrete?
A: The standard value of 28-day compressive strength.
58, heavy compaction hammer inspection compaction quality is how much?
Answer: 4.5kg
59. Measure the crushing value of coarse aggregate to test the quality of the sample, put the sample into three-layer metal measuring cylinder according to roughly the same quantity, and after leveling, how many times will each layer be tamped evenly with a metal bar on the leveling?
A: 25
60. The apparent density of sand is determined by the volumetric flask method. If the difference between the results of two parallel tests is greater than how much, re-sampling should be carried out.
Answer: 0.0 1
6 1. Measure the size ratio of the maximum length direction to the maximum thickness direction of particles by vernier caliper method. How many particles are needle-like particles?
A: 3
62. The current cement technical standard stipulates that the initial setting time of portland cement shall not be earlier than how long?
Answer: 45 minutes.
63. The cement mortar strength test method (ISO method) stipulates that the sample preparation ratio of cement mortar is cement: standard sand: water?
A: 1: 3: 0.5
64. What is the compressive area of cement mortar compressive strength test fixture?
Answer: 40mm×40mm.
65. How long will it take to test the 3d strength of cement mortar?
Answer: 72h 45min.
66. What is the total mass of standard needles and accessories required for penetration test of asphalt at 25℃?
A:100g
67. What is the initial heating temperature needed to test the softening point of asphalt by ring and ball method?
A: 5 degrees Celsius.
68. Determine the ductility of asphalt at 10℃. What is the drawing speed?
Answer: 5 cm/min
69. What is the stability test temperature of asphalt mixture?
A: 60 degrees Celsius.
70. What is the yield ratio of steel?
Answer: yield strength/tensile strength
7 1. When processing the test results, the calculated value is 2.555 (two decimal places are required). What is the final value?
( 2.56 )
72, in the liquid, plastic limit joint determination method, the same soil sample measured twice into the depth of h 1, h2, what is the allowable error?
(0.5 mm)
73, in the current "highway geotechnical test procedures", what is the size range of coarse-grained group?
(2 mm ~ 60 mm)
74. What is the boundary particle size of coarse aggregate and fine aggregate of asphalt mixture?
(2.36 mm)
75. The rutting test is used to test the performance of asphalt mixture?
(High temperature stability)
76. The adhesion test of asphalt and mineral aggregate is used to evaluate the performance of aggregate?
(Water Stripping Resistance)
77. What is the test to determine the water stability of asphalt mixture?
(Residual stability test)
78. How will the ductility of petroleum asphalt change after aging?
(smaller)
79, Portland cement is not suitable for what?
(mass concrete)
80. Compared with fine-grained soil, coarse-grained soil and macro-grained soil have the characteristics of coarse particles, no plasticity and low cohesion. What are the test methods for the maximum dry density of coarse-grained soil and giant-grained soil?
(Surface vibration compaction method and shaking table method)
8 1, compaction Marshall specimen should first shovel the mixture into the prepared test mold from four directions according to the quartering method, and then insert it into the test mold. What is the insertion method?
(Use the knife along the periphery 10 times, and in the middle 15 times)
82. For natural gravel, it is a more appropriate method to determine its maximum dry density indoors?
(heavy compaction method)
83. What is the heating rate range of asphalt softening point test?
(5℃/ min 0.5℃/ min)
84, the determination of concrete setting time, what method?
(Penetration resistance method)
85, slump is less than how much fresh concrete, with weber consistency meter to determine its workability? (10mm)
86, compressive strength test of cement concrete, strength calculation, when the difference between any one of the three specimens and the median exceeds the median, take the median as the measured value?
( 15%)
87.87 What reagents are needed? Determination of cement dosage by EDTA? A
Answer: EDTA disodium standard solution, 10% ammonium chloride solution, 1.8% sodium hydroxide solution (including triethanolamine).
88. Calcareous red indicates that the soil is usually three-phase, and when is it two-phase? Also known as what kind of soil?
When the pores in the soil are filled with water, the soil is a two-phase body, which is called saturated soil.
When the pores in the soil are filled with gas, the soil is a two-phase body, called dry soil. )
89. When the total content of coarse-grained soil in fine-grained soil is more than 40%, how to choose the maximum dry density and the best water content in soil compaction test.
(The maximum dry density of coarse-grained soil is tested and compared with the results of heavy compaction test. The maximum dry density is the maximum of two test results, and the optimum water content is the corresponding value. )
90. A relatively simple method to measure the shear strength of soil is to use a direct shear apparatus. This instrument is simple to operate, but it has many shortcomings. What are the main shortcomings?
(The drainage condition of the sample can't be controlled)
9 1, the quality and technical requirements of coarse aggregate of asphalt mixture, and the content of needle-like particles (mixture) shall not be greater than that of expressways and first-class highways; Surface layer (15%), other layers (18%) and other highways (20%).
92. Technical requirements for needle-like particle content (%) of coarse aggregate of cement concrete pavement: Grade I (5), Grade II (15) and Grade III (25).
93, the use of aggregate with good gradation and moderate thickness can make the concrete mixture (workability) better, and the dosage of (cement) is smaller, at the same time, it can improve the (strength) and (durability) of concrete.
94. The smaller the porosity of the same material, the higher its strength. When the porosity of the material is constant, the more pores there are, the better the thermal insulation performance of the material is.
95. The density of granular materials is p, the apparent density is p', and the bulk density is po'.
(p > p ')
96. The total bulk density of coarse aggregate is the mass per total volume under specific conditions. What does the total volume include?
(Mineral entity, closed pore, open pore)
97. In addition to meeting the basic quality requirements, the coarse aggregate used in the anti-skid layer of expressways and first-class highways also needs to be tested for its adhesion to asphalt. What indicators should be tested?
(Mud content, abrasion value, acicular particle content)
98. Los Angeles abrasion test For the sample with particle size grade B, the number and total mass of steel balls used are respectively?
(1 1, 4850 25g)
99. According to GB 1594-79 standard, the effective calcium oxide content of calcareous quicklime is 68%. What grade is this quicklime?
(level 1)
100, what are the main technical indicators of lime?
(active calcium oxide plus magnesium oxide content)
10 1. What is the minimum gap between the mixing blade of cement mortar mixer and the mixing pot?
(3 mm)
102. In concrete mix design, water-cement ratio is mainly determined by factors such as (design strength of cement concrete) and (actual strength of cement), water consumption is determined by (maximum particle size and design slump), and sand ratio is determined by (maximum particle size and water-cement ratio).
103. What are the main factors that affect the compaction effect?
(Soil moisture content, compaction work, soil gradation, etc. )
104, in order to improve the water stability of asphalt mixture, dry ground fine quicklime, hydrated lime powder or cement can be used as fillers, but what are the requirements for their dosage?
(Should not/should exceed 1%-2% of the total weight of mineral aggregate)
105. in the unconfined compressive strength test of inorganic binder stabilized materials, what is the pressing speed of the specimen?
(1 mm/min)
106. What does the peak point of compaction curve mean?
(It shows that under a certain compaction work, the maximum dry density of soil can only be reached when the water content of soil reaches a certain value. )
107. The sieving curve of sand shows the particle size distribution of sand. The fineness modulus indicates the fineness of sand.
108, the grading of coarse aggregate particles can be divided into (continuous grading) and (discontinuous grading).
109, in asphalt mixture, the boundary particle size of coarse aggregate and fine aggregate is (2.36 )mm, and in cement concrete aggregate, the boundary particle size of coarse aggregate and fine aggregate is (4.75) mm ..
1 10. In the apparent density test of coarse aggregate, in order to eliminate the influence of (opening), the sample was soaked for 24 hours.
1 1 1, structural concrete coarse aggregate detection indicators are (crushing value, needle, silt content, silt content, particle content less than 2.5mm * * * five items.
1 12, the technical standards of stone strength classification are (saturated uniaxial compression) and (wear).
1 13. The higher the polishing value of stone, the better its (sliding resistance), and the higher the wear value of stone, the worse its wear resistance.
1 14 What is the fineness modulus of medium sand?
(3.0~2.3 )
1 15. What is the fineness modulus range of ordinary concrete sand?
(3.7~ 1.6)
1 16, the water saturation rate of stone is higher than the water absorption rate, but the calculation methods of them are different.
1 17, lime according to its magnesium oxide content, divided into (calcium) and (magnesium) two kinds of lime.
1 18, the main chemical composition of quicklime is Ca(0H)2, and the main chemical composition of hydrated lime is CaO. (×)
1 19, lime "aging" reduces the heat release during curing. ( √ )
120, what is the dividing line between calcareous lime and magnesia lime?
(5%)
12 1. What is the total mass of the standard Vicat sliding part used in the water consumption test of cement with standard consistency?
(300g 1 g)
122, cement standard consistency water consumption test, the laboratory temperature is (20℃ 2℃), the relative temperature is not less than 50%, the moisture curing box temperature is (20 1℃), and the relative humidity is not less than 90%.
123. Cement sealed samples shall be sealed and kept (for three months). At least one clear and indelible seal mark (number, sampling time \ place \ person) shall be affixed to the container for storing samples.
The pure technical requirements of portland cement in 124 and GB175-1999 are fineness, setting time and volume stability.
125, the molding environment temperature of cement mortar specimen should be (20 2℃) and the relative humidity should be (50%).
126, ordinary concrete mix design should meet four basic requirements (economy, structural design strength, construction workability and environmental durability).
127, impermeability is one of the durability indexes of concrete, and S6 indicates how much water pressure concrete can resist without leakage?
(0.7 MPa)
128, the standard curing condition of cement concrete is (temperature 20 2℃, relative humidity 95%) or curing with immobile Ca(OH)2 saturated solution at temperature 20 2℃.
129, concrete workability is a comprehensive performance, including three meanings (fluidity, cohesiveness and water retention).
130 and GB/T5008 1-2002 "Test Methods for Mechanical Properties of Ordinary Concrete" stipulate that the measurement accuracy of the pressure testing machine is (1%), the failure load of the specimen must be greater than 20% of the full range of the press, but less than 80% of the full range of the press, and the press should have (loading speed).
13 1. The dimensional tolerance of the length, diameter and height of each side of the concrete specimen shall not exceed 1 mm.. (√)
132, after demoulding, the curing of cement mortar strength specimens must be carried out in a fog room that meets the requirements. (×)
133, mass concrete mixed with fly ash is mainly to save cement and reduce the project cost. (×)
134. Briefly describe the design steps of cement concrete mixture ratio. B
Answer: (1) Calculate the preliminary mixture ratio;
(2) put forward the benchmark mixture ratio;
(3) Determine the mixture ratio of the laboratory;
(4) Conversion of site mix ratio.
135. What is the decisive factor affecting the strength of concrete? B
A: Material composition.
136. Sand used for cement concrete in engineering is divided into three types according to fineness modulus: coarse, medium and fine. What is the calculation basis of fineness modulus? C
A: accumulated sieve residue.
137, the needle-like particle content of crushed stone used for cement concrete is determined by (gauge) method, and the needle-like particle content of crushed stone used for base course and surface course is detected by (vernier caliper) method.
138, silt content of aggregate refers to the total content of dust, silt and clay particles with particle size less than or equal to (0.075㎜) in aggregate.
139. The particles whose size ratio between the maximum length direction and the maximum thickness direction is greater than (3) measured by vernier caliper method are acicular particles.
140, the fineness modulus Mx of the two sands is the same, and their gradation (c)
A must be the same, B must be different, and C may not be the same.
14 1, the nominal particle size of stone is usually larger than the maximum particle size (a)
A. the smaller score b and the larger score c are equal.
142, in order to ensure the strength of asphalt mixture, priority should be given to (b) when selecting stones.
A, acid stone B, alkaline stone C and neutral stone D, all of which are wrong.
143, the nominal particle size of stone is usually larger than the maximum particle size (a)
A. the smaller score b and the larger score c are equal.
144, the compressive strength of stone is expressed by the ultimate compressive strength of standard specimens under uniaxial compression.
(filled with water)
145, what indicators are commonly used to express the strength of coarse aggregate?
(Crushing value of stones, wear and tear of machines in Los Angeles)
146. Pneumatic cementing materials can only be hardened in air, while hydraulic cementing materials can only be hardened in water. (× )
147, in the determination of available calcium oxide, phenolphthalein indicator was added to the sample solution, why did the solution change color?
(pink)
148. In the experiment of rapid determination of lime content in lime soil by EDTA titration, calcium red indicator is added to lime soil and ammonium chloride. What color is the solution?
(rose red)
149, the strength grade of portland cement is determined according to the test (cement mortar strength) (3 days and 28 days strength).
150, cement fineness inspection, negative pressure sieve method and water sieve method are controversial, negative pressure sieve method shall prevail.
15 1. During the trial mixing of cement concrete mixture ratio design, it was found that the slump could not meet the requirements. At this time, the dosage of cement slurry should be adjusted while keeping the water-cement ratio unchanged until it meets the requirements.
152, the workability of cement concrete refers to a comprehensive performance of cement concrete in terms of fluidity, plasticity, stability and compactness.
153, the methods for determining the fluidity of concrete mixture are (slump method and Webb wire method).
154. The three basic parameters for determining the concrete mixture ratio are: water cement ratio, sand ratio and water consumption w.
155, what is the size of the flexural strength specimen of cement concrete?
(150mm×150mm× 550mm)
156, the new standard of concrete compressive strength pressure testing machine stipulates that its measurement accuracy is 1%. (√)
157, measuring instruments and equipment used in the laboratory, all without verification procedures must be calibrated by themselves. (√)
158, and the total surface area per unit weight of the material is called specific surface area. (×)
159, the sample quality of granular materials that cannot pass through the sieve hole after screening is called sieve residue. (√)
160, when the slump of concrete mixture is greater than 220mm, slump sweep value shall be measured. (√)
16 1, some construction projects can use unqualified cement. (√)
162, and the correction coefficient of cement negative pressure screen is 0.80- 1.20. (√)
163, the new standard for steel inspection stipulates that yield strength should be used instead of yield point. (√)
164, the compressive strength test of cement can be carried out at any temperature. (×)
165. During steel inspection, the pointer of the testing machine will not return to zero until it returns to zero before starting. (×)
166. According to GB/T70 1- 1997, a sample should be taken in the tensile test, and the gauge L0= 10d0 is measured. (√)
167 the new standard concrete mixture ratio analysis test adopts water washing method. (√)
168, the compressive strength test of concrete specimens should be uniformly loaded according to the loading speed required by the new standard until it is destroyed. (×)
169, the bulk density test of concrete is changed to apparent density test in the new standard. (√)
170. When mixing cement slurry according to GB/T 1346-200 1, first pour the cement into the mixing pot, and then slowly add the mixing water. (×)
17 1. How many times should the alcohol combustion method be used to determine soil water content?
(three times)
17 1. los Angeles abrasion test: what size sieve should be used to screen the samples after they are put into the abrasion cylinder?
(1.7mm square hole screen)
172, strength test of cement mortar. The materials and dosage weighed for every three specimens are as follows:
(450g cement; Sand1350g; ; Water 225ml)
173, asphalt penetration test, the depth of the water layer above the surface of the sample should be less than what?
(10mm)
174, what is the minimum mass of the sample required for the silt content test of coarse aggregate with a nominal maximum particle size of 26.5mm?
(6 kg)
175, what is the allowable difference between the two parallel test results of coarse aggregate silt content test?
(0.2%)
176, what is the difference between the fineness modulus of the two parallel tests? (0.2)