Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
April 24, 2023
In cement concrete projects, sand should be clean, hard, in accordance with the provisions of the grading, fineness modulus of 2.5 or more grit or sand.
When coarse sand or medium sand cannot be obtained, after the mix ratio design test is required, it is considered that when fine sand is available, fine sand with less than 3% of sand and mud impurities can be used.
Sand technical requirements are shown in Table 1.
Sand Technical Requirements Table 1
project | skills requirement | |||||||
One grain level Match | Screen size (mm) | Square hole sieve | Round hole sieve | |||||
0.16 | 0.315 | 0.63 | 1.25 | 2.5 | 5.0 | |||
Cumulative screening the amount(%) | District I | 100~90 | 95~80 | 85~71 | 65~35 | 35~5 | 10~0 | |
District II | 100~90 | 92~70 | 70~41 | 50~10 | 25~0 | 10~0 | ||
District III | 100~90 | 85~55 | 40~16 | 25~10 | 15~0 | 10~0 | ||
Soil debris content (punching method) (%) | ≤3 | |||||||
Sulfide and sulfate content (converted to SO3) (%) | ≤1 | |||||||
Other sundries | Do not mix lime, cinder, grass roots and other debris |
Note: 1. The sand in Area I basically belongs to coarse sand. Zone II sand belongs to medium sand and a part of coarser sand with moderate grain size and best gradation. Zone III sand belongs to fine sand and partially fine sand;
2. Preparation method of organic substance content standard solution: Take 2g tannin powder dissolved in 98mL of 10% alcohol solution to obtain the required tannic acid solution, then take this solution 2.5mL to inject 97.5mL of 3% concentration of hydroxide The sodium solution was shaken vigorously after stoppering and allowed to stand for 24 hours to obtain a standard solution.
In cement concrete, gravel (gravel) stones should be hard, clean, free of debris, weathering and other stones, and should meet the requirements of the grading requirements, the maximum particle size should not exceed 40mm. The technical requirements for gravel are shown in Table 2.
Crushed stone technical requirements Table 2
project | skills requirement | ||||
Particles Grading | Mesh size (round hole sieve)(mm) | 40 | 20 | 10 | 5 |
Accumulated sieve residue (%) | 0~5 | 30~65 | 70~90 | 95~100 | |
strength | Stone saturated with compressive strength and concrete Design compressive strength ratio (%) | ≥200 | |||
Stone strength classification | ≥3 level | ||||
Needle particle content (%) | ≤15 | ||||
Sulfur and sulfate content (converted to SO3) (%) | ≤1 | ||||
Soil debris content (extraction method) (%) | ≤1 |
Note: Stone strength classification should comply with the provisions of the "Highway Engineering Stone Test Regulations".
For gravel and gravel aggregates, non-active aggregates should be used instead of high-activity aggregates.
Gravel Technical Requirements Table 3
project | skills requirement | |||||
Particles Grading | Mesh size (round hole sieve)(mm) | 40 | 20 | 10 | 5 | |
Accumulated sieve residue (%) | 0~5 | 30~65 | 75~90 | 95~100 | ||
Voidage (%) | ≤45 | |||||
Soft particle content (%) | ≤5 | |||||
Needle particle content (%) | ≤15 | |||||
Soil debris content (preparation method) (%) | ≤1 | |||||
Sulfur and sulfate content (converted to SO3) (%) | ||||||
Organic matter content (colorimetric method) | Color is not darker than standard solution | |||||
Stone strength classification | ≥3 level | |||||
Note: Stone strength can use crush index value (%).
The above is the Specification requirements for sand and gravel for cement concrete construction we have listed for you. You can submit the following form to obtain more industry information we provide for you.
You can visit our website or contact us, and we will provide the latest consultation and solutions
Send Inquiry
Most Popular
lastest New
Send Inquiry
Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
Fill in more information so that we can get in touch with you faster
Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.