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IS 3535:1986 is the Indian Standard (BIS) for methods of sampling hydraulic cement. This standard prescribes the methods for sampling hydraulic cement from bags, bulk storage, and conveyors to obtain representative samples for physical and chemical testing. It details the required equipment, lot sizes, and sample preparation procedures.
Methods of sampling hydraulic cement
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Cement, Concrete, Aggregates and RCC
Standard Practice for Sampling and the Amount of Testing of Hydraulic Cement
Specifies procedures for sampling hydraulic cement from various sources, directly aligning with IS 3535's core scope.
EN 196-7:2007European Committee for Standardization (CEN), Europe
HighCurrent
Methods of testing cement - Part 7: Methods of taking and preparing samples of cement
Details the methods for taking and preparing cement samples, covering the same fundamental procedures as IS 3535.
AASHTO T 127-15American Association of State Highway and Transportation Officials, USA
HighCurrent
Standard Method of Test for Sampling and Amount of Testing of Hydraulic Cement
Closely based on ASTM C183, this standard provides sampling methods for transportation and infrastructure projects.
Key Differences
≠ASTM C183 includes requirements for the 'amount of testing' to be performed on the collected samples, a topic not covered in IS 3535, which focuses solely on the sampling method.
≠The required minimum mass of the final laboratory sample differs. IS 3535 specifies not less than 3 kg, whereas EN 196-7 requires a larger sample of at least 5 kg.
≠The sampling frequency (number of increments per lot size) varies. For example, for a 200-tonne bulk lot, IS 3535 requires 20 increments, while EN 196-7 requires 12 spot samples for a lot up to 250 tonnes.
≠Terminology, while conceptually similar, differs. IS 3535 uses 'increment' and 'gross sample', while EN 196-7 uses 'spot sample' and 'bulk sample' for the same concepts.
Key Similarities
≈All standards share the primary objective of obtaining a representative sample of hydraulic cement from a larger consignment or lot.
≈The fundamental principle of taking multiple small samples (increments/spot samples) from different parts of the lot and combining them to form a single gross (or bulk) sample is common across all standards.
≈Procedures for sampling from various types of storage and transport are covered, including bags, bulk silos, bins, wagons, and conveyors.
≈The use of similar sampling apparatus, particularly slotted metal tubes for drawing samples from the depth of bags or bulk storage, is a shared technical specification.
Parameter Comparison
Parameter
IS Value
International
Source
Final Laboratory Sample Mass (Minimum)
3 kg
5 kg
EN 196-7
Final Laboratory Sample Mass (Minimum)
3 kg
5 kg (10 lb)
ASTM C183
Increment / Spot Sample Mass
Not specified, but increments should be of 'approximately equal quantity'
At least 2 kg per spot sample
EN 196-7
Sampling Frequency (Bulk Storage up to 200 tonnes)
20 increments
12 spot samples (for up to 250 tonnes)
EN 196-7
Sampling from Bags (Lot of 100 bags)
From 11 bags (Calculated as sqrt(100)+1)
From 10 bags (for a lot size of '3000 bags or less')
ASTM C183
Sampling Tube Outer Diameter
35 to 40 mm
Approximately 35 mm (1 3/8 in.)
ASTM C183
Total Gross/Bulk Sample Mass (Recommended)
Approximately 10 kg
Not explicitly stated, but derived from the number and mass of spot samples (e.g., 12 samples x 2 kg = 24 kg)
EN 196-7
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Minimum mass of laboratory sample5 kg
Maximum lot size for bagged cement2000 bags (100 tonnes)