Sand Sieve Analysis (IS 383:2016)
| # | Sieve Size | Weight retained (g) | Cumulative weight retained (g) | % retained | Cumulative % retained | % passing | IS limit (passing) |
|---|---|---|---|---|---|---|---|
| 1 | 10 mm | ||||||
| 2 | 4.75 mm | ||||||
| 3 | 2.36 mm | ||||||
| 4 | 1.18 mm | ||||||
| 5 | 600 Micron | ||||||
| 6 | 300 Micron | ||||||
| 7 | 150 Micron | ||||||
| 8 | 75 Micron | — |
About Sand Gradation (IS 383:2016)
IS 383:2016 classifies fine aggregates into four zones (I–IV) based on percentage passing through standard sieves. The selected zone, the sand type, and the fineness modulus (FM) together guide suitability for different concrete and plaster mixes.
Zone I — Coarse
Use: RCC, foundations, paver blocks, higher strength concrete. Helps reduce water demand and shrinkage.
Zone II — Medium
Use: General RCC, masonry, typical structural concrete. Balanced workability and strength.
Zone III — Medium–Fine
Use: Plastering, finishing, thin sections. Smooth finish but may need more cement.
Zone IV — Fine
Use: Very thin plaster, tiling beds, delicate finishes. Watch segregation and cement demand.
Sand Types & Silt Limits
- Natural sand: allowable silt ≤ 3%
- Crushed / M-sand: allowable silt ≤ 15%
- Mixed sand: allowable silt ≤ 12%
Fineness Modulus (FM)
FM is the sum of cumulative percent retained on standard sieves (from 4.75 mm to 150 µm) divided by 100. Typical categories: Very Fine 1.6–2.0, Fine 2.0–2.4, Medium 2.4–2.8, Coarse 2.8–3.5.
Quick Test Procedure
- Dry and weigh the sample.
- Sieve through the standard set (10 mm → 75 µm).
- Record weight retained on each sieve (whole grams).
- Compute % retained, cumulative %, and % passing.
- Compare with the IS 383 zone limits and compute FM.
IS 383:2016 — Fine Aggregate Grading (Percentage Passing)
| Sieve | Zone I | Zone II | Zone III | Zone IV |
|---|---|---|---|---|
| 4.75 mm | 90–100 | 90–100 | 90–100 | 90–100 |
| 2.36 mm | 60–95 | 75–100 | 85–100 | 95–100 |
| 1.18 mm | 30–70 | 55–90 | 75–100 | 90–100 |
| 600 µm | 15–34 | 35–59 | 60–79 | 80–100 |
| 300 µm | 5–20 | 8–30 | 12–40 | 15–50 |
| 150 µm | 0–10 | 0–3 | 0–10 | 0–15 |
Note: 10 mm and 75 µm are included for completeness in testing; FM uses 4.75 mm to 150 µm cumulative % retained.
The Ultimate Guide to Sand Sieve Analysis & Fineness Modulus (IS 383:2016)
In structural concrete construction and massive infrastructure projects—like dams, canal linings, and heavy foundations—the quality of fine aggregate (sand) directly dictates the workability, strength, and durability of the concrete. A slight deviation in sand gradation can lead to severe segregation, increased water demand, or excessive shrinkage cracks.
To strictly monitor this, quality control engineers conduct the Sieve Analysis Test. This test grades the sand into distinct zones and determines its Fineness Modulus (FM), ensuring the batching plant uses only approved materials strictly adhering to IS 383:2016 specifications.
1. Understanding IS 383:2016 Sand Zones
The Indian Standard IS 383 categorizes fine aggregates into four specific grading zones based on the percentage of material passing through standard IS sieves. The zone indicates the coarseness or fineness of the sand:
Zone I (Coarse Sand)
Retains more material on the upper sieves (like 2.36 mm and 1.18 mm). Ideal for high-grade RCC, heavy foundations, and wearing surfaces where high compressive strength is required.
Zone II (Medium Sand)
The most versatile and widely accepted sand for standard reinforced concrete works. It provides the perfect balance of strength and workability for columns, beams, and slabs.
Zone III (Medium-Fine Sand)
Contains a higher percentage of finer particles. Generally avoided for heavy structural RCC without mix-design adjustments, but excellent for internal masonry and rough plastering.
Zone IV (Fine Sand)
Highly fine material. Used exclusively for thin-layer finishing works, putty application, or specialized mortar. Using Zone IV sand in RCC drastically increases cement and water demand.
2. What is Fineness Modulus (FM)?
The Fineness Modulus is an empirical figure obtained by adding the total percentage of the sample retained on standard sieves and dividing the sum by 100. It gives a quick index of the average size of the particles in the entire aggregate sample.
The Calculation Rule: When calculating FM for sand, only the cumulative percentages retained on the following specific sieves are summed: 4.75 mm, 2.36 mm, 1.18 mm, 600 μm, 300 μm, and 150 μm. (Note: The 10 mm and 75 μm sieves are part of the physical test but are generally excluded from the mathematical FM summation).
- Fine Sand: FM ranges from 2.2 to 2.6
- Medium Sand: FM ranges from 2.6 to 2.9
- Coarse Sand: FM ranges from 2.9 to 3.2
3. Natural River Sand vs. Crushed M-Sand (Silt Content)
With the depletion of natural river beds, the construction industry has heavily shifted toward Manufactured Sand (M-Sand) produced by crushing hard granite or basalt rock. IS 383:2016 explicitly accounts for this transition by adjusting the permissible limits for fine particles passing the 75-micron (75 μm) sieve.
Material passing the 75 μm sieve is classified as silt or clay dust. Excessive dust coats the larger aggregates, preventing the cement paste from bonding properly, which ultimately lowers the concrete strength.
| Type of Fine Aggregate | Maximum Permissible Limit passing 75 μm (IS 383) |
|---|---|
| Natural Sand (Uncrushed) | ≤ 3% by weight |
| Crushed Stone Sand (M-Sand) | ≤ 15% by weight |
| Mixed Sand | ≤ 12% by weight |
4. Standard Test Procedure in the QC Lab
- Take a representative sand sample (usually 1000g or 1 kg) and oven-dry it to remove all surface moisture.
- Arrange the standard IS sieves in descending order: 10 mm at the top, followed by 4.75 mm, 2.36 mm, 1.18 mm, 600 μm, 300 μm, 150 μm, and finally the 75 μm sieve with a pan at the bottom.
- Place the dried sample on the top sieve, secure the lid, and agitate using a mechanical sieve shaker for exactly 10 minutes.
- Carefully weigh the exact amount of material retained on each individual sieve.
- Calculate the percentage retained, the cumulative percentage retained, and the percentage passing to determine the Sand Zone and FM.
5. How to Use This Sieve Analysis Generator
This tool is designed to assist material engineers and site supervisors in rapidly simulating gradation reports and verifying mix design parameters. To generate a report:
- Enter your target Sample Weight (typically 1000g).
- Select your required IS 383 Zone (I through IV) based on your structural requirement.
- Choose your Sand Type to set the correct passing limit for the 75 μm sieve (crucial for M-Sand compliance).
- Optionally, specify a target Fineness Modulus (FM) Range.
- Click Generate to instantly produce a mathematically compliant, randomized gradation table that fits perfectly within the selected IS code limits.
Disclaimer: This generator provides simulated data strictly governed by IS 383:2016 mathematical limits. It is intended for educational purposes, mix-design simulation, and report formatting. It does not replace physical laboratory testing of actual site materials.
