SV Technocrats India’s Cylindrical Mould is used to cast concrete specimens for compressive strength and split tensile strength testing of concrete. It conforms to standards like IS: 10086, IS: 516, ASTM C470, and BS 1881.
Standard Sizes of Cylindrical Moulds
The size of the mould depends on the test requirements and standards:
Mould Size (Diameter × Height in mm)
Test Standard
Application
150 × 300 mm
IS: 516 / ASTM C39
Standard for concrete compressive & tensile strength testing
100 × 200 mm
ASTM C39
Used for smaller specimens or lightweight concrete
50 × 100 mm
ASTM C496
Split tensile strength testing
Moulds are typically made of cast iron, steel, or plastic, ensuring durability and shape retention.
Components of a Cylindrical Mould
Cylindrical Body – Ensures accurate shape for testing.
Base Plate – Provides a stable platform and prevents leakage.
Detachable Collar – Helps in easy demoulding.
Clamping Screws or Wing Nuts – Secure the assembly during casting.
Testing Procedure Using Cylindrical Mould
1. Preparation of Concrete Mix
Prepare concrete as per mix design specifications.
Ensure the mix has the required workability and consistency.
2. Mould Preparation
Apply a thin layer of mould release oil to prevent adhesion.
Assemble the mould with the base plate tightly fixed.
3. Casting the Specimen
Fill the mould in three layers.
Compact each layer using a tamping rod (25 strokes per layer) or a vibrating table to remove air voids.
4. Surface Finishing & Curing
Level the top surface using a trowel.
Cover with a plastic sheet and allow it to set for 24 hours.
After demoulding, cure the specimen in water at 27°C ± 2°C for 7, 14, or 28 days, depending on the test requirement.
5. Testing of Concrete Specimen
· Compressive Strength Test (IS: 516, ASTM C39)
The cured cylindrical specimen is placed in a compression testing machine (CTM).
Load is applied gradually until failure.
Formula for Compressive Strength: fc=PAf_c = \frac{P}{A}fc=AP Where:
P = Maximum applied load (N)
A = Cross-sectional area (mm²)
· Split Tensile Strength Test (ASTM C496, IS 5816)
The cylinder is placed horizontally in a universal testing machine (UTM).
Load is applied along the diametrical plane until failure.
Formula for Split Tensile Strength: ft=2PπLDf_t = \frac{2P}{\pi LD}ft=πLD2P Where:
P = Applied load (N)
L = Length of cylinder (mm)
D = Diameter of cylinder (mm)
Applications of Cylindrical Moulds
✅ Concrete Strength Evaluation – Determines compressive and tensile strength of concrete.
✅ Quality Control in Construction – Ensures compliance with design specifications.
✅ Concrete Mix Design Optimization – Helps achieve desired performance in structures.
