Specification for moulds for use in tests of cement and concrete

Scope of IS 10086 (Clause 4.1): Specifications for Moulds for Cement and Concrete Tests

The standard specifies dimensions and tolerances for various types of moulds used in cement and concrete testing, including:

1. Cube Moulds (Table 2)

Note: Base plate size may vary due to clamping arrangements.

2. Cylindrical Moulds (Table 3)

• Mean internal diameter: 150 ± 0.2 mm
• Actual internal diameter in any direction: 150 ± 0.5 mm
• Height: 300 ± 1 mm

IS 10086 - Definitions: Key Dimensions, Tolerances & Materials for Moulds

1. Cube Moulds (Table 2)

2. Cylindrical Moulds (Table 3)

• Mean internal diameter: 150 ± 0.2 mm
• Actual internal diameter in any direction: 150 ± 0.5 mm
• Height: 300 ± 1 mm
• Wall plate thickness: 6 mm
• Base plate diameter: 300 ± 3 mm
• Capping plate diameter: 195 ± 2 mm
• Planeness tolerance for wall plate: 0.05 mm
• Planeness tolerance for base/capping plate: 0.03 mm

3. Beam Moulds (Table 4)

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IS 10086: Materials of Construction for Moulds

1. Materials (Clause 3.1 & Table 1)

• Materials must be non-absorbent, non-reactive with concrete, and dimensionally stable.

2. Key Dimensions & Tolerances (Clause 4.1)

Cube Moulds (Table 2)

IS 10086 - Dimensions and Tolerances for Moulds

1. Cylindrical Moulds (Table 3)

2. Beam Moulds (Table 4)

3. Cube Moulds (Table 2)

| Parameter

IS 10086 - Construction: Key Specifications & Dimensions

1. Materials of Construction (Clause 3.1, Table 1)

• Cube Moulds (50 mm): Side/Base plates - Cast iron or Mild steel (IS 210-1978 / IS 226-1975)
• Cube Moulds (100-300 mm): Cast iron (IS 210-1978)
• Cylindrical Moulds (150x300 mm): Cast iron/Mild steel (IS 210-1978 / IS 226-1975)
• Beam Moulds: Cast iron side plates; base/top plates mild steel
• Bar Moulds: Mild steel or stainless steel

2. Dimensions & Tolerances (Clause 4.1)

3. Notes

• Dimensions follow coarse class deviation per IS 2102

IS 10086: Accessories - Tamping Rods & Trowels

Tamping Rods (Clause 6.1)

• Type a:
  • Diameter: 16 ± 0.5 mm
  • Length: 600 ± 2 mm
  • Material: Mild steel
  • End: Rounded working end
• Type b:
  • Square section tamping face: 25 ± 0.5 mm
  • Length: 400 ± 2 mm
  • Weight: 2 kg
  • Material: Mild steel with handle
• Type c:
  • Cross-section: 12 × 25 mm
  • Length: 125 to 150 mm
  • Tamping face: Flat, right angle to length
  • Material: Non-absorbent, abrasion-resistant (e.g., rubber compound Shore A hardness 80 ± 10, seasoned teak wood, or ebonite fibre)

Gauging Trowel (Clause 6.2)

• Material: Mild steel blade with wooden handle
• Blade thickness: ≥ 1.5 mm
• Blade length: 195 mm
• Weight: 210 ± 10 g

Summary Table of Tamping Rods

Important Notes:

• Tamping rods ensure proper compaction of concrete in moulds.
• Material and dimensions critical for consistent test results.
• Use specified hardness and non-absorbent materials for type c to avoid moisture absorption.

flowchart TD
    A[Tamping Rod Types] --> B(Type a: Mild Steel, Ø16mm, 600mm)
    A --> C(Type b: Mild Steel, 25x25mm, 400mm, 2kg)
    A --> D(Type c: Rubber

IS 10086 Marking & Mould Specifications Summary

Marking (Clause 7.1)

• Each mould component shall be clearly and indelibly marked with:
  • Manufacturer's name or registered trademark (or both)
  • Date of manufacture
• Marking should not interfere with mould performance.

Key Tables & Dimensions for Moulds

Important Tolerances for Cube Moulds (Table 2 excerpt)

Fastening and Clamping Arrangements (IS 10086:1982)

Clause 5.3 Key Points:

• Base Plate Attachment: Preferably by cleats, which can be:

  • Spring-loaded
  • Secured with threaded studs and nuts/wing nuts

• Assembly: Mould parts must be positively and rigidly held together during:

  • Filling
  • Handling
  • Vibration (where applicable)

• Additional Methods: Lock nuts and/or locating pins may be used to ensure rigidity.

Relevant Dimensions Affecting Fastening (from Clause 4.1)

Summary Diagram of Fastening Arrangement

graph LR
    A[Base Plate] -- Cleats --> B[Mould Side Plates]
    B -- Threaded Studs/Nuts --> C[Secure Assembly]
    C -- Lock Nuts/Locating Pins --> D[Rigid Holding]
    D -- During Filling/Handling/Vibration --> E[Stable Mould]

Additional Notes:

• Base plate size may vary depending on clamping arrangements (Amendment No.1).
• Materials for cleats and fasteners typically follow IS 210-1978 (cast iron) or IS 226-1975 (mild steel).

In brief: Use spring-loaded or threaded cleats with nuts/wing nuts, ensure rigid assembly with lock nuts or locating pins, and maintain dimensional tolerances for proper fastening and clamping per IS 10086.

Permissible Surface Defects in Moulds (IS 10086: Clause 5.1.2)

• Blowholes and blemishes such as honeycombing are allowed on inside faces of mould plates and base plates.
• These defects must be repaired by:
  • Welding or fitting with mild steel pins.
  • Finished flush by machining or filing.
• Acceptable number of blowholes:
  • Up to 5 blowholes for cube moulds ≤ 150 mm.
  • Up to 10 blowholes for cube moulds of 225 & 300 mm, cylindrical moulds (150 mm dia × 300 mm height), and beam moulds (100×100×500 mm & 150×150×700 mm).
• Size limits of blowholes:
  • Cube and beam moulds: max 5 mm diameter, depth 3–5 mm.
  • Cylindrical moulds: max 20–25 mm diameter.

Summary Table for Blowhole Limits

Key Notes:

• All defects must be repaired and finished flush to ensure accurate specimen casting.
• Surface tolerances and dimensions for moulds are detailed in Tables 2 to 5 of IS 10086 for cubes, cylinders, beams, and bars.

flowchart TD
    A[Surface Defects on Mould] --> B{Blowholes/Blemishes?}
    B -->|Yes| C[Repair by Welding or Pins]
    C --> D[Finish Flush by Machining/Filing]
    D --> E{Blowhole Count & Size Limits}
    E

IS 10086: Quality and Durability Requirements for Moulds (Summary)

Material Specifications (Table 1)

• Cube Moulds (50 mm to 300 mm): Cast iron or mild steel as per IS 210-1978*, IS 226-1975+
• Cylindrical Moulds (150 mm dia × 300 mm height): Cast iron/mild steel (IS 216-1978*, IS 210-1978*)
• Beam and Bar Moulds: Mild steel or stainless steel (IS 226-1975+)

Dimensional Tolerances

Key Notes:

• Base plate dimensions may vary depending on clamping arrangements.
• All dimensions in millimeters.
• Permissible planeness variation is critical for accurate testing.

Typical Cube Mould Dimensions (Excerpt from Table 2)

IS 10086 Key References: Dimensions, Tolerances & Materials for Cement & Concrete Test Moulds

1. Dimensions & Tolerances

| Cylindrical Moulds (150 mm dia × 300 mm height) | | - Internal diameter | 150 ± 0.2 mm (mean), actual ± 0.5 mm in any direction | | - Height | 300 ± 1 mm | | - Wall plate thickness | 6 mm | | - Base & capping plate diameter | Base: 300 ± 3 mm; Capping: 195 ± 2 mm | | - Planeness tolerance | Cylindrical wall: 0.05 mm; Base/capping plate: 0.03 mm |

| Beam Moulds (100×100×500 & 150×150×700 mm) | | - Length between internal faces (A*) | 500 & 700 mm | | - Width (B*) | 100 ± 0.2 & 150 ± 0.2 mm | | - Height (G*) | 100 ± 0.05 & 150 ± 0.05 mm | | - Wall plate thickness (E) | 9 & 12 mm | | - Base plate size (C* × D*) | 600×225 & 830×275 mm | | - Base plate thickness

IS 10086: Amendments and Updates Summary

This standard covers specifications for moulds used in cement and concrete testing. Key amendments update dimensions, tolerances, and references to related IS codes.

Key Amendments Highlights:

• Amendment 1 (1982):
  Added note on base plate size variability due to clamping arrangements.

• Amendment 2 (1985):
  Clarified permissible variation in planeness: surface must lie between two planes not exceeding specified gap.

• Amendment 3 (1988):
  Added "and the accessories" to clauses on mould selection and accessories.

• Amendment 4 (1993):
  Updated reference from IS 2102:1969 to IS 2102 (Part 1):1980 for tolerances.

• Amendment 5 (2006):
  Added prefatory notes on standard adoption and related IS test methods (IS 516, IS 1199, IS 4031).

Key Tables for Dimensions & Tolerances:

Material Specifications:

• Cast iron or mild steel for cube and cylindrical mould plates (IS 210-1978, IS 226-1975).
• Beam moulds: cast iron side plates,