River Sand vs M-Sand vs P-Sand: Which to Use for Concrete, Plaster and Masonry?

Quick answer: river sand is natural; M-sand (manufactured sand) is crushed stone processed to sand grading; P-sand is a finer plastering sand. For structural concrete use sand that meets IS 383 (grading zone, fines and shape) and the engineer's specification, and well-graded M-sand or river sand can both comply. Plaster usually needs a finer, well-graded sand that meets IS 1542, and masonry mortar has its own standard, IS 2116. Test the actual supply instead of buying by name.

Supply and quality vary by source. River-sand availability is constrained in many regions by mining restrictions, and M-sand quality varies from plant to plant, with badly processed material carrying excess fines or flaky particles.

Grading Zones and Fines: The Numbers That Matter

IS 383 classifies fine aggregate into four grading zones by the percentage passing the 600 micron sieve, with Zone I the coarsest and Zone IV the finest. Zone II is common for concrete, but a zone label alone does not make sand suitable; the whole grading curve, the fines content and the shape matter too.

Fine-particle limits are tighter for natural sand than for crushed sand in the standard and vary with the use, so read the table in the current edition for your case. Too many fines raise water demand and shrinkage, while too few make a harsh, hard-to-place mix.

Which Sand for Which Job

Use the specification first. In general, structural concrete needs well-graded sand that meets IS 383 with low silt and fines, masonry mortar uses sand to IS 2116, and plaster uses a finer sand to IS 1542 for a smooth surface. Sand that is too fine in concrete increases water and cement demand.

Site Tests You Can Do (and Their Limits)

Silt test: fill a clear jar about a quarter with sand, add clean water to three-quarters, shake, and let it settle for a few hours. Silt and clay settle as a distinct layer above the sand, and a thick layer means the sand should go for a laboratory silt test. A quick rub between the palms that stains them is another warning.

Bulking test: measure the height h1 of a moist sand sample in a cylinder, then flood it with water and measure the settled height h2. Bulking is (h1 − h2) ÷ h2 × 100, so 100 mm and 80 mm give 25%. Field tests are quick screens and do not replace a sieve analysis to IS 2386.

Quantity and Units: Brass, Cubic Metres and Tonnes

Sand is often sold by the brass: 1 brass is 100 ft³, or about 2.83 m³. Weight varies with moisture, and 4 to 4.5 tonnes per brass is a commonly quoted range, so agree whether you are buying by volume or weight and how it is measured at delivery.

Estimate quantity from the work. M20 concrete needs about 0.42 m³ of sand per m³ (M15, M20 and M25 concrete mix guide), and 1:6 brickwork needs about 0.25 m³ per m³ (brick quantity calculator guide). For plaster, 100 m² at 12 mm and 1:4 needs about 1.2 m³ of sand and 440 kg of cement (roughly 9 bags), before wastage and extra thickness on uneven walls.

Compare Landed Cost of Usable Sand, Not the Rate per Brass

A cheaper load with high silt costs more once you add the cement and rework it causes. Ask for a sample, test it, approve it, and compare offers on delivered, tested quality using the method in the quotation comparison guide. For M-sand, ask for the supplier's sieve analysis and fines test results, and check every delivery against the approved sample.

Cover stored sand, keep it clear of soil and drains, and remeasure moisture after rain because bulking changes with it.

Standards and References Used in This Guide

IS 383 (coarse and fine aggregate for concrete); IS 1542 (sand for plaster); IS 2116 (sand for masonry mortars); IS 2386 (methods of test for aggregates for concrete).

Values are summarised for buyers and standards are revised from time to time. The current edition of each standard, the project specification and the responsible professional's drawings always govern.

Choosing by Situation

Which one to buy

1. Get the sand requirement for each use from the specification.
2. Ask each supplier for a sample and the source name.
3. Run field silt and bulking screens and send promising samples for sieve analysis.
4. Approve one sample and record it as the reference.
5. Compare landed cost of tested sand, including transport and moisture.
6. Agree the buying unit and how it is measured at delivery.
7. Check every delivery visually against the approved sample.
8. Store covered, off the soil and away from drains.

Compare current options and place orders onMadoverbuildings (MOB).

Don't substitute these

• Keep a jar of the approved sample on site as a reference.
• Record the delivery vehicle and time so disputed loads can be traced.
• Do not mix sands from different sources in one pour without testing.
• Recheck bulking after rain.
• Ask M-sand suppliers whether the fines were washed and how the product is graded.
• Use plaster sand only for plaster unless the engineer approves otherwise.

How This Plays Out on Madoverbuildings (MOB)

Madoverbuildings (MOB) can help you source sand, aggregates, cement and related materials once the specification is confirmed. Explore relevant construction materials on MOB, submit a mixed list through Magic Quote, or use an RFQ for project quantities. Confirm the product, test data, availability and delivery for your location, and keep the engineer's approval for the sand type.

Frequently Asked Questions