2-OPERATION

DRUM SPEED

The mixer drum should revolve between 20 and 25 R.P.M.’s for best results in mixing concrete. To obtain this speed using a 1725/1800 R.P.M. electric motor, use a 2” diameter “A” section V-pulley.

If using a 6 to 1 speed reduction 3 H.P. gasoline engine, use a 6 ¼” diameter “A” section V-pulley.

GETTING READY FOR MIXING

Lay out forms for your concrete floor, patio, driveway, sidewalk, etc.

The quality of concrete is directly related to the quality of the cement paste. The quality of the paste, in turn, is directly related to the amount of water mixed with the cement. For a given amount of cement, as the amount of mixing water is reduced, the strength of the paste increases, making the concrete stronger and more durable.

The proportions by weight given in Table 1 can be used as a starting point to make 1 cu. Ft. (0.028 m3) of strong, durable concrete. The proportions given in Table 2 are volumetric; 1 bag of cement is equal to 1 cu. ft. (0.28 m3) and weighs 94 lbs.

(42.6 kg). The Canadian bag of cement has a net mass of 40 kg.

The proportions are only a guide and may need adjustments to give a workable mix with locally available aggregates.

Table 1. Proportions by Weight to Make 1 Cu. Ft. of Concrete

 

 

 

Air-entrained concrete

 

 

Concrete without air

 

M a x i m u m -

 

 

 

 

Course

 

 

 

 

Course

 

size course

 

Cement

S a n d

aggregate W a t e r

Cement

S a n d

aggregate

W a t e r

aggregate in.

 

l b

 

l b

l b

l b

l b

 

l b

l b

l b

 

 

 

 

 

 

 

 

 

 

 

 

3/8

 

2 9

 

5 3

4 6

1 0

2 9

 

5 9

4 6

1 1

1/2

 

2 7

 

4 6

5 5

1 0

2 7

 

5 3

5 5

1 1

3/4

 

2 5

 

4 2

6 5

1 0

2 5

 

4 7

6 5

1 0

1

 

2 4

 

3 9

7 0

9

2 4

 

4 5

7 0

1 0

1 1/2

 

2 3

 

3 8

7 5

9

2 3

 

4 3

7 5

9

*If crushed stone is used, decrease coarse aggregate by 3 lbs and increase sand by 3 lbs.

 

 

Metric conversion:

1 lb = 0 .121 kg

 

10 lbs = 4 . 54 kg

 

 

 

 

 

1 in . = 25mm

 

 

1 Cu. Ft. = 0.028 m 3

 

 

 

 

 

Table 2. Proportions by Volume*

 

 

 

 

 

 

 

 

 

 

 

 

Air-entrained concrete

 

 

Concrete without air

 

M a x i m u m -

 

 

 

 

Course

 

 

 

 

Course

 

size course

 

Cement

S a n d

aggregate W a t e r

Cement

S a n d

aggregate

W a t e r

aggregate in.

 

l b

 

l b

l b

l b

l b

 

l b

l b

l b

 

 

 

 

 

 

 

 

 

 

 

 

3/8

 

1

2

1/4

1 1/2

1/2

1

2

1/2

1 1/2

1/2

1/2

 

1

2

1/4

2

1/2

1

2

1/2

2

1/2

3/4

 

1

2

1/4

2 1/2

1/2

1

2

1/2

2 1/2

1/2

1

 

1

2

1/4

2 3/4

1/2

1

2

1/2

2 3/4

1/2

1 1/2

 

1

2

1/4

3

1/2

1

2

1/2

3

1/2

*The combined volume is approximately 2/3 of the sum of the original bulk volumes.

ãPortland Cement Association 1980

3

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Gilson 59015C manual Operation, Drum Speed, Getting Ready for Mixing
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59015C specifications

The Gilson 59015C is a high-performance analytical instrument widely recognized for its exceptional capabilities in the field of liquid chromatography. Designed to meet the rigorous demands of laboratory environments, this model offers a range of features that enhance precision, efficiency, and ease of use.

One of the standout features of the Gilson 59015C is its advanced pump technology. The instrument is equipped with a high-pressure pump that delivers consistent flow rates, ensuring accurate and reproducible results. This pump system is engineered to minimize pulsation, which is crucial for achieving high-resolution separations in complex sample matrices. The model supports a variety of flow rates, making it suitable for both method development and routine analytical tasks.

Another significant characteristic of the 59015C is its modular design. This flexibility allows users to configure the system according to their specific analytical needs. The instrument can be integrated with various detectors, such as UV-Vis, fluorescence, and mass spectrometry, providing versatility for a wide range of applications. This adaptability makes the Gilson 59015C a valuable asset in many areas, including pharmaceuticals, environmental testing, and food safety.

The user-friendly interface of the 59015C further enhances its appeal. Equipped with a large, intuitive touchscreen, the instrument facilitates easy navigation through complex methods and protocols. Users can quickly set parameters, monitor system performance, and analyze results without the steep learning curve often associated with advanced analytical systems. The software also provides comprehensive data management features, allowing for efficient data analysis and reporting.

In terms of safety and maintenance, the Gilson 59015C includes built-in diagnostics and alerts to ensure optimal performance. The system is designed for easy access to components, streamlining routine maintenance tasks. This thoughtful design reduces downtime, allowing laboratories to maintain high productivity levels.

Overall, the Gilson 59015C is a robust and versatile liquid chromatography system that combines modern technology with user-friendly features. Its reliable performance, modularity, and ease of use make it an ideal choice for laboratories seeking to enhance their analytical capabilities while ensuring accuracy and reproducibility in their results.
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