Sieve Analysis of Sand for Masonry Mortar (IS 2116:1980)
QA/QC Sieve Analysis Report - IS 2116:1980
| IS Sieve Size | Weight Retained (g) | Cumulative Wt Retained (g) | Percentage Weight Retained (%) | Cumulative % Retained | % Passing | IS 2116 Limits (%) |
|---|---|---|---|---|---|---|
| Enter details and click "Generate IS-Compliant Data" | ||||||
Why Sieve Analysis is Crucial for Mortar Sand
In civil engineering and construction, the quality of sand (fine aggregate) used in cement mortar significantly impacts the strength, workability, and durability of masonry structures. The Indian Standard IS 2116:1980 provides strict guidelines and specification requirements for sand used in masonry mortars. Performing a proper sieve analysis ensures that the gradation of the sand falls within these permissible limits.
Gradation refers to the particle size distribution of the sand. If the sand is too coarse, the resulting mortar will be harsh, difficult to work with, and prone to poor adhesion. Conversely, if the sand is too fine, it requires a higher water-cement ratio, which leads to increased drying shrinkage and cracking in the plaster or masonry joints. Sieve analysis helps achieve a balanced mix.
Sampling Procedure for Sand (Fine Aggregate)
Proper sampling is just as important as the testing itself. A non-representative sample will yield inaccurate results, regardless of how precisely the sieve analysis is performed. Sampling should be carried out in accordance with IS 2430 (Methods for Sampling of Aggregates for Concrete).
Key Steps for Sampling on Site:
- From Stockpiles: Samples should be taken from various parts of the stockpile (top, middle, and bottom) to avoid segregation bias. Coarser particles tend to roll down to the base of the pile.
- Quartering Method: Once a bulk sample is collected, it must be reduced to the test weight (typically 1000g for fine aggregates). The sample is mixed thoroughly, formed into a cone, flattened, and divided into four quarters. Two diagonally opposite quarters are rejected, and the process is repeated until the desired test weight is achieved.
- Moisture Content: Sieve analysis must be performed on surface-dry sand. If the sand is wet, it should be dried in an oven at 100°C to 110°C before sieving to prevent finer particles from sticking together and skewing the gradation curve.
IS 2116:1980 Gradation Table Limits
According to the standard, the sand should pass through the following IS sieves in the prescribed percentages by mass:
| IS Sieve Designation | Percentage Passing by Mass |
|---|---|
| 4.75 mm | 100 |
| 2.36 mm | 90 to 100 |
| 1.18 mm | 70 to 100 |
| 600 micron | 40 to 100 |
| 300 micron | 5 to 70 |
| 150 micron | 0 to 15 |
Note: This tool is designed for educational, planning, and quality control estimation purposes. Always ensure physical testing corresponds with site conditions and regulatory approvals.
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