moulds and accessories for determination of density index (relative density) of cohesionless soils

IS 10837 - Scope: Key Specifications & Tables

Scope Summary (Clause 1.1):
Covers two types of moulds, guide sleeves, surcharge base plates with handles, and surcharge weights used in laboratory determination of density index (relative density) of cohesionless soils using a vibratory table.

Key Dimensions & Weights (All in mm unless stated)

Materials of Construction (Clause 3.1, Table 1)

Units & Symbols (SI Units)

IS 10837 - Key Materials Specifications for Moulds & Accessories

Dimensional Tolerances & Weights (Selected)

Notes:

• Cadmium plating is specified for mild steel parts to prevent corrosion.
• Lead filling in surcharge weights ensures accurate mass.
• Use referenced IS codes for detailed material properties and manufacturing tolerances.

graph TD
    A[Mould] -->|Materials| B{Copper alloy, Brass, Aluminium, Mild Steel}
    C[Guide Sleeve] -->|Material| D[Mild Steel (Cadmium plated)]
    E[Surcharge Base Plate] -->|Material| D
    F[Surcharge Weight Body] -->|Material| D
    F -->|Filling| G[Lead]

This summary ensures compliance with IS 10837 material standards for soil testing equipment.

IS 10837: Dimensions and Tolerances Summary

• Dimensions: Nominal dimensions per Figs. 1 to 5; tolerances as per IS 2102 (Part 1)-1980 (medium class), unless otherwise specified.
• Tolerance example: ±0.05 mm on key dimensions (e.g., mould sizes, weights).
• Key dimensions from figures:

• Materials (Clause 3.1):

  • Mould: Copper alloy, brass, aluminum, or cadmium-plated mild steel.
  • Guide sleeve, surcharge base plate, surcharge weight body: Cadmium-plated mild steel.
  • Surcharge weight filling: Lead.

• Units: All dimensions in millimeters (mm), weights in kilograms (kg).

Reference Standards for Tolerances & Materials

• IS 2102 (Part 1)-1980: General tolerances for linear/angular dimensions.
• IS 318-1981, IS 292-1961, **IS 617-197

IS 10837: Construction - Key Specifications & Tables

Materials of Construction (Clause 3.1, Table 1)

Dimensional Specifications (Clause 169.77, Figures 1-5)

• Guide Sleeve: 3 holes for M5 pins at 120° apart; PCD 76 mm (small mould) and 226 mm (large mould).
• Surcharge Base Plate: Thickness 12 mm; hole patterns vary with mould size.
• Lifting Handle: Ø10 rod fitted.

Important Notes:

• All dimensions in millimetres (mm).
• Tolerances: ±0.05 mm for critical dimensions.
• Materials must comply with relevant IS standards for durability and corrosion resistance.

Summary Diagram: Construction Components

graph TD
    Mould -->|Material| CopperAlloy[Cu Alloy, Brass, Al, MS]
    GuideSleeve -->|Material| MildSteelMS
    SurchargeBasePlate -->|Material| MildSteelMS
   

IS 10837 - Marking Specifications Summary

Clause 5.1: Mandatory Marking on Equipment

• Manufacturer's name or registered trademark
• Type of material used
• Date of manufacture

Clause 5.1.1: Optional Marking

• ISI Certification Mark may be applied, indicating compliance with Indian Standards and quality control.

Materials (Clause 3.1, Table 1)

Dimensional Tolerances & Weights (Clause 169.77)

• All dimensions in millimeters with ±0.05 tolerance

Key Notes:

• Markings must be clear, indelible, and on each equipment part.
• ISI mark usage follows the Indian Standards Institution Certification Marks Act.
• Materials must conform to respective IS codes for quality and durability.

flowchart TD
    A[Equipment Part] --> B[Mark Manufacturer Name/Trademark]
    A --> C[Mark Material Type]
    A --> D[Mark Date of Manufacture]
    A -->

IS 10837 Guide Sleeve Key Details

1. Material Specification (Clause 3.1, Table 1)

• Material: Mild Steel
• Surface Treatment: Cadmium plated
• Relevant IS: IS 513-1973 (Cold rolled carbon steel sheets)

2. Construction & Dimensions (Clause 4.2, Fig. 2)

• Inside surface: Finished smooth.
• Each mould is provided with one guide sleeve.
• Clamp assembly: 3 set screws, 2 with lock nuts.
• Pin holes for guide sleeve:
  • For 3,000 cm³ mould: 3 holes M5 at 120° apart on 76 mm PCD.
  • For 15,000 cm³ mould: 3 holes M5 at 120° apart on 226 mm PCD.

3. Dimensional Tolerances (Clause 2.1)

• Tolerances as per IS 2102 (Part 1)-1980 (Medium class).
• Dimensions shown in Fig. 2 (refer IS 10837 for exact values).

4. Summary Table for Guide Sleeve Pin Holes

Visual Concept (Mermaid.js)

circleDiagram
    title Guide Sleeve Pin Hole Layout
    direction TB
    subgraph Guide Sleeve for 3,000 cm³
        A1((M5 Hole))
        A2((M5 Hole))
        A3((M5 Hole))
        A1 --- A2
        A2 --- A3
        A3 --- A1
    end
    subgraph Guide Sleeve for 15,000 cm³
        B1((M5 Hole))
        B2((M5 Hole))
        B3((M5 Hole))
        B1 --- B2
        B2 --- B3
        B3 --- B1
    end

Note: Refer to IS 108

IS 10837: Surcharge Base Plate with Handle - Key Details

1. Materials (Clause 3.1, Table 1)

• Surcharge Base Plate with Handle: Mild Steel, Cadmium plated (IS: 513-1973§)
• Surcharge Weight Body: Mild Steel, Cadmium plated (IS: 513-1973§)
• Filling: Lead (IS: 782-1978|1)

2. Dimensions & Specifications

• Base Plate Thickness: 12 mm
• Handle: Ø10 mm rod as per Fig. 4
• Hole pattern: 3 holes M5 at 120° apart (76 mm PCD for 3,000 cm³, 226 mm PCD for 15,000 cm³)

3. Surcharge Weight (Clause 4.4, Fig. 5)

• Filled with lead from bottom to achieve specified weight.
• Weight ensures proper surcharge pressure during soil testing.

4. Construction Notes (Clause 4.3)

• Surcharge base plate provided with each mould.
• Handle details per Fig. 4 for ease of lifting.

Summary Diagram (Mermaid.js)

graph LR
A[Mould] --> B[Surcharge Base Plate]
B --> C[Handle (Ø10 mm rod)]
B --> D[Surcharge Weight (Lead filled)]
D --> E[Specified Total Weight]

Use these specs to ensure compliance with IS 10837 for surcharge base plates with handles in soil testing equipment.

IS 10837: Surcharge Weight Key Details

1. Surcharge Weight Specification (Clause 4.4 & Fig. 5)

• The surcharge weight body is filled with lead from bottom to achieve the specified weight.
• Two mould sizes with surcharge weights:

2. Materials (Clause 3.1)

• Surcharge weight body: Mild Steel, cadmium plated (IS: 513-1973)
• Filling: Lead (IS: 782-1978)

3. Related Components

• Surcharge base plate with handle: Mild Steel, cadmium plated (see Fig. 3 & 4)
• Moulds: Copper alloy, brass, aluminium, or mild steel (cadmium plated)

Summary Diagram of Surcharge Weight Components

graph LR
A[Mould] --> B[Surcharge Base Plate with Handle]
B --> C[Surcharge Weight Body (Mild Steel)]
C --> D[Lead Filling (Weight as per Fig. 5)]

Note: The surcharge weight ensures proper loading on soil samples during testing, critical for accurate soil property measurements.

Rounding Off Rules as per IS 10837 (Ref: Clause 0.4)

• Rounding off of test/analysis results must comply with IS 2:1960 (Rules for rounding off numerical values).
• The number of significant digits in the rounded value should match the number of significant digits in the specified standard value.
• Example: If a dimension is specified as 150 ± 0.05 mm, the measured/calculated value should be rounded to 3 significant figures or to the nearest 0.05 mm as per tolerance.

Key Points from IS 2:1960 (Rounding Off Rules)

Example from IS 10837 (Marking Tolerances)

Summary

• Always round final values according to IS 2:1960.
• Retain the same number of significant digits as the specified value.
• Use the tolerance specified (e.g., ±0.05 mm) for precision.

flowchart TD
    A[Measured/Calculated Value] --> B[Apply IS 2:1960 Rounding Rules]
    B --> C[Match Significant Figures of Specified Value]
    C --> D[Final Rounded Value]

This ensures compliance and consistency in reporting test results and dimensions.

IS 10837: Compliance and Testing - Key Specifications & Tables

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

2. Dimensional Tolerances (Clause 169.77)

• All linear dimensions ±0.05 mm.
• Mould sizes: 3,000 cm³ and 15,000 cm³.
• Key dimensions (mm):
  • Mould height: 243.60 ± 0.05
  • Surcharge weight (3,000 cm³): 24.7 ± 0.2 kg
  • Surcharge weight (15,000 cm³): 860 ± 0.5 kg

3. Rounding Off (Clause 0.4)

• Final test values must be rounded per IS 2-1960.
• Retain significant digits equal to those in the specified values.

4. Units and Symbols

• Length: metre (m)
• Mass: kilogram (kg)
• Force: newton (N) = 1 kg·m/s²
• Pressure/stress: pascal (Pa) = 1 N/m²

Summary Table: Surcharge Weight Dimensions