Concrete mixing plant laboratory instruments

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Concrete mixing plant laboratory instrumentsInstruments and equipment:

1. Cement constant load pressure testing machine*

2. Cement electric flexural testing machine*

3. Cement sand compaction table*

4. Cement standard curing box*

5. 4 electronic scales * (weighing 50g, sensitivity 0.01mg; weighing 100-200g, sensitivity 0.1mg; weighing 1000g, sensitivity 0.1g; weighing 2000g, sensitivity 1g)

6. Cement binder flowability tester*

7. Cement slurry mixer*

8. Cement standard consistency and setting time tester*

9. Boiling box*

10. Cement negative pressure sieve analyzer*

11. Breathable ratio surface area meter*

12. Electric heating blower box (0-300 ℃)*

13. Chloride ion content analyzer*

14. Atomic absorption spectrometer*

15. Flame photometer*

16. Sand and gravel vibrating screen machine*

17. Crushing value tester*

18. Pressure testing machine * (Level 2 qualification: no less than 1 pressure testing machine for 300kN, 1000kN, 2000kN, and 3000KN each; Level 3 qualification: At least one pressure testing machine with a capacity of 300kN, 1000kN, and 2000KN each

19. Density meter*

20. Three piece or four piece impeller agitator*

21. Concrete mixer*

22. Concrete vibration table*

23. Gas content analyzer*

24. Concrete penetration resistance tester*

25. Pressure bleeding meter*

26. Concrete impermeability tester*

27. Concrete dynamic elastic modulus tester*

28. Expansion rate measuring instrument*

29. High temperature furnace (0-1000 ℃)*

30. Frost resistance test chamber*

(The above inspection equipment with * should be provided for purchase.)

31. Cement specimen curing water tank

32. Supporting trial mold

33. Cement scraper ruler

34. Cement compression fixture

35. Lei's clamp

36. Rayleigh clamp tester

37. Platinum crucible

38. Low temperature electric heating plate

39. Ventilation hood

40. Drying machine

41. Platinum dish

42. Platform scale

43. Sand and stone test sieve

44. Needle gauge

45. Compressed steel formwork

46. Slump tester

47、 混凝土抗折装置

48. Trapezoidal board

49. PH value measuring instrument for additives (chemical analysis method)

50. calomel electrode

51. Glass electrode

52. Composite electrode

53. Cement compression fixture

54. Porcelain crucible

55. Stopwatch

56. Cement standard sieve

57. Free calcium oxide measuring instrument (chemical analysis method)

58. Acidimeter

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Procurement List of Instruments and Equipment for Commercial Concrete Mixing Plant Laboratory:

1. YES-2000 digital pressure testing machine 1 unit

2. One YES-300 cement flexural and compressive testing machine

3. One DZK-5000 cement electric flexural testing machine

4. Standard constant temperature and humidity curing box YH-40B spraying 1 set

5. One HJW-60 single horizontal axis concrete mixer

6. Concrete vibration table 1 meter per unit

7. 1 digital display of concrete penetration resistance meter

8. Concrete rapid curing box HJ-84 1 unit

9. One 7L concrete air content tester

10. 1 set of concrete shrinkage expansion meter SP-540 type

11. One SY-2 concrete pressure bleeding meter

12. One ZCA-3 concrete rebound tester

13. Electric hot blast drying oven 550x550x450 1 set

14. Cement negative pressure sieve analyzer FYS-150 1 set

15. Cement slurry mixer NJ-160 1 unit

16. One JJ-5 cement mortar mixer

17. Cement sand compaction table ZT-96 1 set

18. One NLD-3 cement mortar flowability tester

19. One ZBSX-92A standard vibrating screen machine

20. One HP-4.0 concrete impermeability tester

21. One new standard cement consistency meter

22. One Lei style boiling box FZ-31A

23. One BYS-III intelligent control device for the maintenance room

24. Two humidifiers in the maintenance room

25. One FBT-9 specific surface area measuring instrument

26. One net slurry flowability test mold

27. Cement sand test mold 40x40x160 15 pieces

28. 20 concrete compression test molds 150x150x1501

29. 30 sets of concrete compression test molds with dimensions of 100x100x100

30. Anti permeability test mold 175x180x150 18 pieces

31. One electronic scale weighing 30kg-1g

32. One electronic scale weighing 100kg-10g

33. One electronic balance weighing 2000g-0.01g

34. One TM-II concrete elastic modulus tester

35. One set of sand and stone sieves

36. Two sets of slump testers with thickness

37. One set of needle plate gauge

38. Cement sampler, 2-meter stainless steel, 1 piece

39. One set of anti-seepage test block demoulder

40. One set of stone crusher

41. One set of sand crusher

42. Box type resistance furnace SX2-4-10 1 unit

43. Cement negative pressure sieve 0.080mm, 045mm, 5 each

44. 225ml water measuring device, 225ml 2 pieces

45. Volume liter 1L-50L 1 set

46. 10 cement softening and curing tanks

49. Two 50cm steel rulers

50. 5 dry and wet temperature gauges

51. Porcelain plates 200 * 300, 10 pieces

52. Porcelain plates 300 * 450, 10 pieces

53. 10 pieces of 100 * 100ml glass plates

54. Two pieces of 500 * 500ml glass panels

55. 10 thermometers

56. Two sets of liquid specific gravity meters ranging from 0.8-1.5 (7 pieces)

57. 10 thermometers

58. Measuring cylinder 50-1000ml 1 set

59. One set of 50-1000ml beakers

60. Li's specific gravity bottle 250ml, 1 piece

61. Glass wide mouthed bottle 1000ml 1 piece

62. 10 straws

63. One cement compression fixture (Xinda Instrument)

64. One air pump

65. One experimental mixing device

66. Two triangular scraper blades

67. Standard sand (ISO) 10 bags

68. 12 Lei's clamps

69. One LD-50 clamp tester

Design scheme for concrete mixing plant:

Design of an annual output of 390000 m3 concrete mixing plant

To ensure the quality of concrete engineering, meet the construction schedule of concrete pouring, and ensure the production order of this project, a mixing plant will be built in this work area.

Location selection of mixing plant

1. The mixing plant is planned to be located in a suburban area with convenient transportation and moderate distance from the supply location.

2. There is a road directly leading to the mixing plant, ensuring the transportation of various materials and the transportation of concrete from the mixing plant.

3. The groundwater in this area is abundant, making it easy to find a source of construction water; And the terrain is relatively high, which facilitates the discharge of wastewater.

4. There is a high-voltage power pole near the location, which facilitates the introduction of construction electricity.

Main facilities and equipment

1. Blender: According to the requirements of the construction schedule, the production capacity of the concrete mixing plant is 180 m3/h. Based on this, we have chosen the HZS180 double horizontal shaft forced mixer as the main machine, which has good mixing quality and high efficiency.

2. Cement storage and transportation facilities: This mixing plant uses bulk cement and is equipped with three 100t bulk cement storage tanks. The transportation of cement is mainly supplied and transported by cement manufacturers.

3. Storage and transportation facilities for sand, stone, additives, and water: The mixing plant is equipped with a 45m × 18m × 1.8m sand and stone stacking and storage yard, and is equipped with two Xiamen XG951 loaders for stacking and loading materials into the mixer aggregate bin. The ground of the silo is equipped with a 4% inward sloping cross slope, and a 30cm × 30cm drainage ditch is set outside the silo. The drainage ditch is equipped with reinforced steel water grates to facilitate the passage of the loader. The outer wall and partition wall of the silo are made of M10 mortar and rubble, with a height of 1.8m and a thickness of not less than 50cm. There is a 2.6m × 1.5m × 1.5m admixture pool for easy storage and management. There is a 2.6m × 5m × 1.5m water tank as a backup water tank.

4. Concrete conveying equipment: transported to the pouring site by concrete tankers, and then transported to various pouring points by concrete conveying pumps. This site is equipped with two HBT60 concrete conveying pumps and six 8m3 concrete tankers as the main conveying equipment for concrete, which can ensure the transportation of concrete.

5. Generator set: This station is equipped with one 200kw diesel generator set as a backup power source for the mixing plant to ensure uninterrupted production

HZS180 Double Horizontal Shaft Forced Blender Parameter Table 4.7

Concrete mix design (C30):

⑴ Preparation strength (fcu, o):

fcu,o =fcu.k+1.645×σ=30+1.645×5.0

=38.225Mpa,

Among them, fcu, 0 concrete preparation strength (MPa);
The standard value of concrete strength designed by fcu. k (MPa);
Standard deviation of concrete strength (MPa), taken as σ=5.0 MPa;

When encountering the following situations, the concrete mix strength should be increased:

(1) When there is a significant difference between the on-site conditions and the experimental conditions.

(2) When using non statistical methods to evaluate concrete with a strength grade of C30 or higher.

2. Determine the basic parameters in mix design

(1) Water consumption per cubic meter of concrete (unit water consumption)

For dry hard and plastic concrete, the water cement ratio in the range of 0.400.80 can be selected according to the coarse aggregate variety, particle size, and construction process requirements for the consistency of the concrete mixture. The water consumption can be selected according to Table 4.1 and Table 4.2; The water consumption of concrete with a water cement ratio less than 0.40 and concrete using special forming processes should be determined through experiments.

Table 4.1 Water consumption of dry and hard concrete (Kg/m3)

Table 4.2 Water consumption of plastic concrete (Kg/m3)

Note: 1 The water consumption in this table is based on the average value of medium sand and gravel. When using fine sand, the water consumption per cubic meter of concrete can be increased by 5-10 kg; when using medium sand, it can be reduced by 5-10 kg.

• When various additives or admixtures are added, the water consumption decreases accordingly.

The water consumption for flowable and highly flowable concrete should be calculated according to the following steps:

Based on the water consumption with a slump of 90mm in Table 4.2, calculate the water consumption of concrete without admixtures by increasing the water consumption by 5Kg for every 20mm increase in slump; The water consumption of concrete when adding admixtures can be calculated according to the following formula:

Month = Month ( 1-x )

Mwa -- The water consumption per cubic meter of concrete mixed with admixtures, Kg

Mwo -- Water consumption per cubic meter of concrete without admixtures, Kg

The water reduction rate of x------------ additive, determined through experiments,%

(2) Sand ratio

When there is no historical data available for reference, the determination of concrete sand ratio should comply with the following regulations:

The concrete sand ratio with a slump of 10-60mm can be selected according to Table 4.3 based on the type, particle size, and water cement ratio of coarse aggregates; The sand ratio of concrete with a slump greater than 60mm. It can be determined through experiments or adjusted based on Table 4.3 by increasing the sand ratio by 1% for every 20mm increase in slump; The sand ratio of concrete with a slump of less than 10mm should be determined through experiments

Table 4.3 Sand Ratio of Concrete

(3) The dosage of additives and admixtures

The dosage of admixtures and additives should be determined through experiments and should comply with the current national standards such as the Technical Specification for Application of Concrete Admixtures (GBJ119), Technical Specification for Application of Fly Ash in Concrete and Mortar (JGJ28), Technical Specification for Application of Fly Ash in Concrete (GBJ146), and Granulated Blast Furnace Slag Powder for Cement and Concrete (GB/T18046)

(4) Large water cement ratio and small cement consumption

When designing concrete mix proportions, the high water cement ratio and low cement content of concrete should comply with the provisions in Table 4.4:

Table 4.4 Large water cement ratio and small cement consumption of concrete

(5) Air entraining agent dosage

*Concrete in damp and cold environments should be mixed with air entraining agents or air entraining water reducing agents. The dosage of air entraining agent should be determined based on the air content of concrete and through experiments. The small air content of concrete should comply with the provisions of Table 4.5, and the air content of concrete should not exceed 7%. The coarse and fine aggregates of concrete should undergo durability tests.

Table 4.5 * Small Air Content of Concrete in Wet and Severe Cold Environments

3. Calculate the mix proportion

When calculating the concrete mix proportion, the calculation formula and relevant parameter tables are based on the dry aggregate as the reference. When calculating based on saturated surface dry aggregate, it should be corrected. Dry aggregate refers to fine aggregate with a moisture content of less than 0.5% or coarse aggregate with a moisture content of less than 0.2%.

After consulting the "Quick Reference Manual for Concrete Mix Proportion" (Second Edition) and the commonly used mix proportion table

Concrete strength C30; Consistency: 16-20s, 11-15s, 5-10s, etc; Sand type: medium sand; Preparation strength: 38.2Mpa; Cement strength: 32.5 Mpa 42.5 Mpa;

Common concrete mix proportions Table 4.6

Choose the appropriate mix ratio based on the actual situation, which can achieve higher economic benefits.

Material balance calculation

Annual Balance Method:

The annual output is 390000 m3, and the production capacity of the mixer is 180 m3/h.

1、 Qh = n * Q (m3/h) ---------(1)

Qh - hourly productivity of the mixing plant (building), m3/h

The number of mixers installed in the mixing plant (building)

Q - The hourly productivity of each mixer, m3/h

2、 Qd = 0.9C*8Qh -----------（2）

Qd - Daily production of the mixing plant (building), m3/d

0.9-- Daily production imbalance coefficient

C -- Number of daily work shifts

10- The number of hours worked per shift

3、 Qy = 300K*Qd -------------(3)

Qy - Annual output of the mixing plant (building), m3/a

K - Annual production imbalance coefficient 0.9

300 working days per year

Number of mixers: n=0.89, take n=1

Daily concrete production: 1620 m3

So: choosing to use the 2 × HZS120 double horizontal shaft forced mixer can meet the production requirements of an annual output of 390000 cubic meters of concrete.

The design results of concrete mix proportion are shown in Table 4.7:

If concrete is produced according to the mix proportions in Table 4.7, the total annual output of concrete is 390000 cubic meters. The annual total consumption of water, cement, coal ash, sand, gravel, and water reducing agents required is shown in Table 4.8 as follows:

Table 4.8:

（1） Aggregate batching system (batching machine)

The PLD1600A concrete batching machine is a front-end automatic batching equipment used in conjunction with a mixer. The machine consists of a feeding mechanism, weighing system, electrical control system, etc. Its characteristics are that the feeding mechanism is arranged in a "cross" shape, fed by a belt conveyor, and weighed by a lever+single sensor, with accurate measurement.

Aggregate conveying system

The aggregate conveying system adopts the lifting bucket method, which has the major advantage of occupying a small area and saving land resources.

Xian County Xinda Highway Bridge Engineering Test Instrument Factory also supplies and produces: SCM-200 double end face grinding machine, DYE-300 digital pressure testing machine, 1-meter concrete vibration table, YH-40B/60B/90B standard constant temperature and humidity curing box, concrete slicer, concrete grinding machine, DYE-300S fully automatic flexural and compressive testing machine, cement mortar compaction table, concrete mixing plant testing instrument, concrete single axis mixer, concrete impermeability meter, concrete standard curing box, cement standard curing box low-temperature test box, constant temperature and humidity curing box, F101-1 drying box and other testing instruments. Concrete pressure testing machine, concrete standard curing room, concrete impermeability tester DYE-300 computer constant stress pressure testing machine, cement mortar mixer, concrete double horizontal shaft mixer, concrete single horizontal shaft mixer NJ-160 cement slurry mixer, electric compaction instrument, concrete drilling and coring machine, concrete vibration table, concrete penetration resistance meter, air drying oven, cement rapid curing box, concrete accelerated curing box, concrete dynamic modulus tester, concrete air content tester, concrete pressure bleeding meter, cement mortar mixer, cement slurry mixer, cement mortar compaction table, atomic absorption spectrometer, flame photometer and other testing instruments, cement testing instruments, asphalt testing instruments, highway and bridge instruments. At the same time, a complete set of laboratory can be set up for users. All instruments sold are guaranteed for one year and have lifelong maintenance. New and old users are welcome to purchase.