Tentative Specification for Single Coat Surface Dressing Using Cationic Bitumen Emulsion

Scope & Key Specifications from IRC 100

Aggregate Specifications (Table 3.2)

Physical Requirements of Aggregates (Table 1)

Quantities of Materials (per 10 m²)

This scope covers aggregate gradation, physical requirements, and material application rates essential for bituminous surfacing per IRC 100.

IRC 100: Introduction - Key Specifications & Tables

1. Aggregate Physical Requirements (Table 1)

2. Aggregate Size Requirements (Clause 13.2)

• 100% passing through 13.2 mm sieve
• Retained on 6.7 mm sieve

3. Material Quantities for Bituminous Surfacing (Table 3)

Summary:

• Use aggregates passing 13.2 mm sieve with max 40% abrasion.
• Control flakiness and water absorption within limits.
• Apply bitumen emulsion and aggregates as per the specified quantities for surfacing.

flowchart LR
    A[Aggregate Selection] --> B[Physical Tests]
    B --> C{Meets IRC 100 Limits?}
    C -- Yes --> D[Use in Surfacing]
    C -- No --> E[Reject or Reprocess]
    D --> F[Apply Bitumen Emulsion + Aggregate]
    F --> G[Final Pavement Layer

Key Specifications for Materials in IRC 100

1. Aggregate Physical Requirements (Table 1)

2. Aggregate Size Requirements (Clause 13.2)

• 100% passing through 13.2 mm sieve
• Retained on 6.7 mm sieve

3. Quantities of Materials per 10 m² (Table 3)

Summary:

• Use aggregates meeting physical requirements (abrasion, impact, flakiness, water absorption).
• Ensure size gradation as per sieve limits.
• Apply materials in quantities specified for surface type.

flowchart TD
    A[Aggregate Selection] --> B{Physical Tests}
    B -->|Pass| C[Size Check]
    C -->|13.2 mm sieve| D[Quantity Calculation]
    D --> E[Bitumen Emulsion

IRC 100: Key Construction Specifications & Formulas

1. Aggregate Specifications (Table 3.2)

2. Physical Requirements of Aggregates

3. Quantities of Materials per 10 m²

Summary Formula for Aggregate Size Selection:

• Ensure 100% passing through upper sieve size.
• Ensure retained on lower sieve size as per type of coat.

flowchart LR
    A[Start: Select Type of Coat] --> B{Type of Coat}
    B -->|First Coat| C[Use 13.2 mm Nominal Size]
    B -->|Renewal Coat| D[Use 11.2 mm Nominal Size]
    C --> E[Check Sieve: Pass 19 mm, Retain 9.5 mm]
    D --> F[Check Sieve: Pass

Application of Binder as per IRC 100

• Binder Type: Cationic bitumen emulsion only.

• Aggregate Gradation (Clause 13.2):

  • 100% passing through 13.2 mm sieve
  • Retained on 6.7 mm sieve

• Quantities per 10 m² (Table 3):

• General Guidelines:
  • Ensure uniform application of binder.
  • Use single coat surface dressing with cationic bitumen emulsion as per tentative specifications.

This ensures proper adhesion and durability of bituminous surface treatments.

Application of Aggregate as per IRC 100

1. Physical Requirements (IS 2386 & IS 6241)

2. Size Requirements

3. Quantities per 10 m² Area

Summary:

• Use 13.2 mm aggregate for the first coat with 0.14-0.15 cum aggregate and 25-30 kg emulsion per 10 m².
• Use 11.2 mm aggregate for renewal coats with 0.09-0.11 cum aggregate and 12-14 kg emulsion per 10 m².
• Ensure aggregates meet physical tests limits to guarantee durability and performance

Rolling and Finishing in IRC 100: Key Specifications and Tables

Aggregate Requirements (Clause 13.2)

• Aggregate size: 100% passing 13.2 mm sieve and retained on 6.7 mm sieve.
• Physical properties (Table 1):

Application Rates (Table 3)

Rolling and Finishing Notes:

• Ensure uniform application of bitumen emulsion and aggregate.
• Rolling should be done immediately after spreading to embed aggregates.
• Use pneumatic or steel wheel rollers as per site conditions.

flowchart LR
    A[Bitumen Emulsion Application] --> B[Aggregate Spreading]
    B --> C[Rolling]
    C --> D[Finishing & Curing]

This ensures a durable, well-bonded surface dressing per IRC 100 guidelines.

IRC 100: Opening to Traffic - Key Specifications

Aggregate Gradation (Clause 13.2)

• First Coat (Surfacing Granular Base):
  • 100% passing through 19 mm sieve
  • Retained on 9.5 mm sieve
• Subsequent/Renewal Coat:
  • 100% passing through 13.2 mm sieve
  • Retained on 6.7 mm sieve

Material Quantities per 10 m² (Table 3)

Summary for Opening to Traffic

• Ensure correct aggregate gradation as per coat type.
• Apply bitumen emulsion and aggregate quantities as above.
• Proper curing and compaction are essential before opening to traffic.

flowchart LR
    A[Surface Preparation] --> B[Apply Bitumen Emulsion]
    B --> C[Spread Aggregate]
    C --> D[Compaction]
    D --> E[Allow Curing]
    E --> F[Open to Traffic]

Note: Follow curing time as per IRC guidelines before opening to traffic for durability.

Physical Requirements of Aggregates as per IRC 100

Aggregates must meet the following key physical criteria (Table 1):

Additional Specifications:

• Aggregates should be crushed stone, slag, or crushed gravel (shingle).
• Fragments must be clean, strong, durable, and fairly cubical.
• Avoid uncrushed rounded gravel.
• Free from deleterious materials, dust, ash, or coatings.

Summary Diagram:

flowchart TD
    A[Aggregate Types] --> B[Crushed Stone / Slag / Crushed Gravel]
    B --> C[Physical Tests]
    C --> D[Los Angeles Abrasion ≤ 40%]
    C --> E[Aggregate Impact ≤ 30%]
    C --> F[Flakiness Index ≤ 25%]
    C --> G[Stripping Value ≤ 25%]
    C --> H[Water Absorption ≤ 1% (coarse), 12% (fine)]
    C --> I[Soundness Loss ≤ 18% (5 cycles)]

This ensures durability and strength of aggregates for road construction per IRC 100.

IRC 100: Size Requirements of Aggregates

1. Nominal Size for Different Constructions

2. Physical Requirements of Aggregates (Table 1)

Summary:

• Use 13.2 mm nominal size for first coat surfacing; 11.2 mm for renewal coats.
• Ensure aggregates meet physical durability and shape criteria (abrasion, impact, flakiness).
• Follow IS test methods for quality control.

This ensures durable, well-graded aggregates suitable for road surfacing per IRC 100.

IRC 100: Weather and Seasonal Limitations for Surface Dressing

Key Specifications:

• Temperature: Surface dressing with cationic bitumen emulsion should be done only when atmospheric temperature is above 10°C.
• Storage: Bitumen emulsion should not be stored below 0°C.
• Base Condition: Base can be damp but all standing water must be removed.
• Equipment: All equipment must be on-site and in good working condition.

Application Rates (per 10 m²)

Process Summary

1. Preparation: Clean base, remove loose material.
2. Binder Application: Spray cationic bitumen emulsion uniformly.
3. Aggregate Spreading: Immediately spread aggregate uniformly.
4. Rolling: Use 6-8 tonnes roller, 6-8 passes, overlapping 1/3 track.
5. Opening to Traffic: Preferably after 24 hours (minimum 4 hours).

flowchart TD
    A[Start: Check Weather > 10°C] --> B[Prepare Base (clean & dry)]
    B --> C[Spray Bitumen Emulsion]
    C --> D[Spread Aggregate Immediately]
    D --> E[Roll Surface (6-8 passes)]
    E --> F[Allow to Cure (min 4 hrs, prefer 24 hrs)]
    F --> G[Open to Traffic]

Note: Avoid excessive rolling to prevent aggregate crushing.

Preparation of Base as per IRC 100 (Clause 13.2 and related tables):

Aggregate Specifications

• For surfacing granular base (first coat):
  • 100% passing through 19 mm sieve
  • Retained on 9.5 mm sieve
• For subsequent or renewal coat:
  • 100% passing through 13.2 mm sieve
  • Retained on 6.7 mm sieve

Quantities of Materials (per 10 m² area)

Key Notes:

• Use cationic bitumen emulsion as binding material.
• Ensure proper gradation of aggregates for effective bonding and durability.
• Quantities are approximate and should be adjusted based on site conditions.

flowchart TD
    A[Base Preparation] --> B[Selection of Aggregate]
    B --> C{Type of Coat}
    C -->|First Coat| D[Aggregate: 13.2 mm]
    C -->|Renewal Coat| E[Aggregate: 11.2 mm]
    D --> F[Apply 0.14-0.15 cum Aggregate]
    D --> G[Apply 25-30 kg Emulsion]
    E --> H[Apply 0.09-0.11 cum Aggregate]
    E --> I[Apply 12-14 kg Emulsion]

This ensures a well-prepared base for surface dressing per IRC 100.

Preparation of Binder as per IRC 100

• Binder Type: Cationic bitumen emulsion (Clause: unspecified but mandatory)

• Aggregate Gradation:

  • 100% passing through 13.2 mm sieve
  • Retained on 6.7 mm sieve (Clause 13.2)

• Application Rates (per 10 m²):

• Notes:
  • Use single coat surface dressing technique with cationic bitumen emulsion.
  • Ensure uniform mixing of bitumen emulsion and aggregate before application.

flowchart LR
    A[Bitumen Emulsion (Cationic)] --> B[Mix with Aggregate]
    B --> C[Apply on Prepared Surface]
    C --> D[Compaction & Curing]

This ensures proper adhesion and durability of the binder layer.

Quality Control for Aggregates (IRC 100 based on IS 2386 series)

Key physical requirements and test methods for aggregates ensure durability and strength in construction:

Additional Notes:

• Los Angeles Abrasion and Aggregate Impact Values measure resistance to wear and impact.
• Flakiness Index controls particle shape for workability.
• Water Absorption affects durability and bonding with cement.
• Soundness Tests simulate weathering effects.

Use these limits to select and control aggregate quality for durable pavement and structural concrete.

IRC 100: Safety and Handling - Key Specifications & Tables

While IRC 100 does not explicitly list safety and handling formulas, it provides crucial aggregate and material specifications essential for safe and effective handling in road construction:

Aggregate Physical Requirements (Table 1)

Aggregate Size for Surface Dressing (Clause 13.2)

• 100% passing through 13.2 mm sieve and retained on 6.7 mm sieve

Material Application Rates (Table 3)

Handling Recommendations:

• Use aggregates meeting above physical criteria for durability and safety.
• Apply bitumen emulsion and aggregates as per specified rates to ensure proper bonding and surface integrity.
• Follow IS test methods for quality control to prevent premature failure.

flowchart TD
    A[Aggregate Quality Check] --> B{Meets IS Limits?}
    B -- Yes --> C[Use in Surface Dressing]
    B -- No --> D[Reject or Reprocess]
    C --> E[Apply Bitumen Emulsion & Aggregate as per Table 3]