IS 53172002AI Search Enabled✦ AI Generated

Pitch-Mastic for Bridge Decking and Roads

IS 5317:2002 specifies the requirements and testing methods for pitch-mastic used as a surfacing material on bridge decks and roads. This standard details the composition, physical properties, manufacturing process, and quality control measures for pitch-mastic to ensure durability, skid resistance, and performance under traffic loads. It is essential for engineers and contractors involved in road and bridge construction to ensure compliance with Indian standards for reliable and safe surfacing.

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49Clauses Indexed
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2002Edition
Flooring Wall Finishing and RoofingCategory
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What This Standard Covers

IS 5317:2002 specifies the requirements and testing methods for pitch-mastic used as a surfacing material on bridge decks and roads. This standard details the composition, physical properties, manufacturing process, and quality control measures for pitch-mastic to ensure durability, skid resistance, and performance under traffic loads. It is essential for engineers and contractors involved in road and bridge construction to ensure compliance with Indian standards for reliable and safe surfacing.

Who Uses This Standard

  • Civil Engineers
  • Pavement Design Engineers
  • Bridge Construction Contractors
  • Quality Control Inspectors
  • Materials Testing Laboratories
  • Road Maintenance Authorities
  • Infrastructure Project Managers

Key Topics Covered

Scope and application of pitch-mastic
Composition and material requirements
Bitumen and aggregate specifications
Manufacturing process and temperature control
Hardness number and physical property criteria
Sampling and conformity criteria
Anti-skid surface treatment
Marking and certification requirements
Testing methods for penetration, softening point, and ductility
Use limitations and environmental considerations
Storage and handling of pitch-mastic blocks
Quality assurance and compliance

Table of Contents

1Scope

IS 5317 Scope: Key Specifications & Tables

This standard governs bitumen and pitch-mastic used in construction, specifying physical properties, composition, and testing methods.


1. Bitumen Physical Properties (Table 1)

CharacteristicRequirementIS Test Method
Softening point (Ring & Ball)50 - 90 °CIS 1205
Penetration at 25°C (1/100 cm)10 to 40IS 1203
Ductility at 27°C, minimum (cm)3IS 1208
Loss on heating, maximum (%)1IS 1212
Solubility in carbon disulphide, minimum (%)99IS 1216

Typical bitumen grades: S35 (IS 73), 85/25 (IS 702)


2. Pitch-Mastic Composition (Table 3)

ComponentMin (%)Max (%)
Bitumen1417
Passing 75-micron IS sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022

Analysis per Annex D of IS 1195.


3. Rounding Off

  • Final values must be rounded as per IS 2:1960.
  • Retain significant figures equal to those specified.

This scope ensures quality and uniformity of bituminous materials in construction projects.

2Terminology

IS 5317: Terminology & Key Specifications Summary

  • Terminology: As per IS 334:1982 (Glossary of terms relating to bitumen and tar).
  • Rounding off: Follow IS 2:1960 rules; retain significant figures as per specified values.
  • Certification Mark: Governed by BIS Act 1986 (Clause 8.2.1).

Key Table: Physical Properties of Bitumen (Table 1)

CharacteristicRequirementTest Method (IS No.)
Softening point (Ring & Ball)50 - 90 °C1205
Penetration at 25 °C (1/100 cm)10 to 401203
Ductility at 27 °C, minimum (cm)31208
Loss on heating, max (%)11212
Solubility in carbon disulphide (%)≥ 991216

Notes:

  • Typical binders: Paving bitumen Grade S35 (IS 73), Industrial bitumen Grade 85/25 (IS 702).
  • Use referenced IS codes for detailed test procedures.

flowchart TD
    A[IS 5317 Terminology] --> B[IS 334 Glossary]
    A --> C[Rounding off per IS 2:1960]
    A --> D[Bitumen Properties (Table 1)]
    D --> E[Softening Point (IS 1205)]
    D --> F[Penetration (IS 1203)]
    D --> G[Ductility (IS 1208)]
    D --> H[Loss on Heating (IS 1212)]
    D --> I[Solubility (IS 1216)]

This concise summary aligns terminology and key bitumen specifications per IS 5317.

3Materials

IS 5317 Key Materials Specifications

1. Bitumen (Clause 4.1, Table 1)

PropertyRequirementTest Method (IS)
Softening Point (Ring & Ball)50 - 90 °C1205
Penetration at 25 °C (1/100 cm)10 to 401203
Ductility at 27 °C (min, cm)≥ 31208
Loss on Heating (%) (max)≤ 11212
Solubility in Carbon Disulphide (%) (min)≥ 991216
  • Typical binders: Grade S35 (IS 73), Grade 85/25 (IS 702).

2. Pitch-Mastic Composition (Clause 5.2, Table 3)

ComponentMin (%)Max (%)
Bitumen1417
Passing 75-micron sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022
  • Analysis per Annex D of IS 1195.

3. Fine Aggregate Grading (Clause 4.3.1, Table 2)

Passing IS SieveRetained on IS SieveMin (%)Max (%)
75 micron-05
212 micron75 micron1020
600 micron212 micron535
2.36 mm600 micron025

Notes:

  • Hardness number ranges (Clause 6.1) are suggestive; adjust based on binder type and pavement temperature.
4Manufacture and Composition

IS 5317: Manufacture and Composition of Pitch-Mastic

Key Specifications:

  • Bitumen Properties (Table 1, Clause 4.1):
CharacteristicRequirementIS Test Method
Softening point (Ring & Ball)50–90 °CIS 1205
Penetration at 25 °C10 to 40 (1/100 cm)IS 1203
Ductility at 27 °C≥ 3 cmIS 1208
Loss on heating (%)≤ 1IS 1212
Solubility in carbon disulphide (%)≥ 99IS 1216
  • Typical binders: Paving bitumen Grade S35 (IS 73), Industrial bitumen Grade 85/25 (IS 702).

Composition of Pitch-Mastic (Without Coarse Aggregates) (Table 3, Clause 5.2):

ComponentMin %Max %
Bitumen1417
Passing 75-micron IS Sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022

Additional Requirement (Clause 6.1):

  • Hardness number of pitch-mastic before mixing coarse aggregate: 60 to 80 at 25°C.

Notes:

  • Pitch-mastic analysis per Annex D of IS 1195.
  • Particle size gradation controls anti-skid and mechanical properties.
flowchart LR
    A[Bitumen] --> B[Mix with fine aggregates]
    B --> C[Check gradation per Table 3]
    C --> D[Measure hardness (60-80)]
    D --> E[Mix with coarse aggregates]
    E --> F[Final pitch-mastic product]

This ensures consistent quality and performance of pitch-mastic as per IS 5317

5Physical Properties

IS 5317: Physical Properties of Bitumen & Mastic Composition

Table 1: Physical Properties of Bitumen (Clause 4.1)

CharacteristicRequirementTest Method (IS No.)
Softening point (Ring & Ball)50 - 90 ℃IS 1205
Penetration at 25℃ (1/100 cm)10 to 40IS 1203
Ductility at 27℃, Min (cm)≥ 3IS 1208
Loss on heating, Max (%)≤ 1IS 1212
Solubility in carbon disulphide (%)≥ 99IS 1216
  • Note: Paving bitumen Grade S35 (IS 73) and industrial bitumen 85/25 (IS 702) comply with these.

Table 3: Composition of Pitch-Mastic (Without Coarse Aggregates) (Clause 5.2)

ComponentMin %Max %
Bitumen1417
Passing 75-micron IS Sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022

Additional Notes:

  • Hardness number ranges are suggestive; final values depend on binder type & pavement temperature (Clause 6.1).
  • Round off test results as per IS 2:1960 matching the precision of specified values.

flowchart TD
    A[Bitumen] --> B[Softening Point: 50-90℃]
    A --> C[Penetration: 10-40 (1/100 cm)]
    A --> D[Ductility: ≥3 cm]
    A --> E[Loss on Heating: ≤1%]
    A --> F[Solubility: ≥99%]
    G[Mastic Composition] -->
6Sampling and Criteria for Conformity

IS 5317: Sampling and Criteria for Conformity (Clause 7)

Key Points on Sampling (Clause 7.3)

  • Each specimen must be uniquely identified with a reference schedule including:
    • Authority issuing instructions
    • Sample number
    • Material type, binder, aggregates
    • Relevant specification
    • Mixing plant details
    • Sampling dates (mixing, laying, sampling)
    • Site and position of sample
    • Course thickness and number
    • Foundation and surface treatment details
    • Tests to be performed

Criteria for Conformity (Clause 7.4)

  • Test results must be rounded off as per IS 2:1960.
  • The number of significant digits in the rounded value must match the specified value’s precision.

Hardness Number (Clause 6.3)

  • Determined by the method in Annex E of IS 1195.

Summary Table for Sampling Identification

ParameterDescription
AuthorityName & address issuing instructions
Sample NumberUnique identifier
Material TypeType of material used
Binder TypeBinder used
Aggregate TypeAggregate used
Specification ComplianceStandard intended to meet
Mixing Plant DetailsName & location
Sampling DateDate when sample taken
Site DetailsLocation and position on site
Course DetailsNumber and thickness
Foundation & Surface TreatmentNature/type if applicable
Test DetailsTests to be conducted

Rounding Off Rule (IS 2:1960)

  • Round final test values to same decimal places as specified values.
  • Example: Specified value = 12.5 → Round test result to 1 decimal place.
flowchart TD
    A[Sample Collection] --> B[Specimen Identification]
    B --> C[Reference Schedule with Details]
    C --> D[Testing as per IS 5317]
    D --> E[Result Rounding per IS 2:1960]
    E --> F[Conformity Decision]

This process ensures traceability and consistent conformity evaluation.

7Testing Methods

IS 5317: Testing Methods for Bitumen and Mastic

Key Physical Properties of Bitumen (Table 1, Clause 4.1)

CharacteristicRequirementIS Test Method No.
Softening Point (Ring and Ball)50 - 90 °CIS 1205
Penetration at 25 °C (1/100 cm)10 - 40IS 1203
Ductility at 27 °C, Min (cm)≥ 3IS 1208
Loss on Heating, Max (%)≤ 1IS 1212
Solubility in Carbon Disulphide (%)≥ 99IS 1216

Composition Limits for Pitch-Mastic (Table 3, Clause 5.2)

ComponentMin (%)Max (%)
Bitumen1417
Passing 75-micron IS Sieve2545
Passing 212-micron & Retained 75-micron818
Passing 600-micron & Retained 212-micron430
Passing 236-micron & Retained 600-micron022

Notes:

  • Bitumen tests must follow IS methods precisely.
  • Final test values should be rounded per IS 2:1960 rules.
  • Typical binders satisfying these include Paving Bitumen Grade S35 (IS 73) and Industrial Bitumen Grade 85/25 (IS 702).
  • Pitch-mastic analysis per Annex D of IS 1195.

flowchart TD
    A[Bitumen Sample] --> B{Physical Tests}
    B --> C[Softening Point (IS 1205)]
    B --> D[Penetration (IS 1203)]
    B --> E[Ductility (IS 1208)]
    B --> F[Loss on Heating (IS 1212)]
    B --> G[Solubility (IS 1216)]
    A --> H[Pitch-M
8Marking and Certification

IS 5317: Marking and Certification Key Points

1. BIS Certification Marking (Clause 8.2 & 8.2.1)

  • Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
  • License for use of the Standard Mark is granted under specific conditions by BIS.
  • Pitch-mastic products can also bear the Standard Mark.

2. Specimen Identification (Clause 7.3)

Each sample must be clearly identified with:

  • Name/address of authority issuing instructions
  • Sample number
  • Material type, binder, aggregates
  • Applicable specification
  • Mixing plant details
  • Sampling and laying dates
  • Site and position of sampling
  • Number/thickness of courses
  • Foundation and surface treatment details
  • Tests or information required

3. Rounding Off (Clause None)

  • Follow IS 2:1960 for rounding numerical values.
  • Retain the same number of significant digits as specified values.

Referenced Standards Table (Partial)

IS No.Title
73:1992Specification for paving bitumen
1205:1978Determination of softening point
1208:1978Determination of ductility
334:1982Glossary of terms relating to bitumen and tar
1212:1978Determination of loss on heating
1216:1978Determination of solubility in carbon
702:1998Specification for industrial bitumen

Summary Diagram: Marking & Certification Flow

flowchart LR
    A[Manufacturer] --> B[Applies for BIS License]
    B --> C{BIS Evaluation}
    C -->|Approved| D[Use Standard Mark on Product]
    C -->|Rejected| E[No Mark Allowed]
    D --> F[Product Sampling & Testing]
    F --> G[Specimen Identification (Clause 7.3)]
    G --> H[Compliance Check (IS 5317 & IS 2:1960)]

For detailed licensing conditions, contact the Bureau of Indian Standards.

9Storage and Handling

IS 5317: Storage and Handling of Bitumen - Key Points

1. Physical Properties of Bitumen (Table 1, Clause 4.1)

CharacteristicRequirementTest Method (IS No.)
Softening point (Ring and Ball)50 - 90 ℃IS 1205
Penetration at 25 ℃ (1/100 cm)10 to 40IS 1203
Ductility at 27 ℃, minimum (cm)3IS 1208
Loss on heating, maximum (%)1IS 1212
Solubility in carbon disulphide (%)Minimum 99IS 1216
  • Typical binders: Paving bitumen Grade S35 (IS 73), Industrial bitumen Grade 85/25 (IS 702).

2. Storage Requirements (Clause 8.1)

  • If bitumen is cast into blocks for storage:
    • Mark the date of manufacture
    • Indicate the manufacturer's name

3. Composition of Pitch-Mastic (Table 3, Clause 5.2)

ComponentMinimum (%)Maximum (%)
Bitumen1417
Passing 75-micron IS Sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022

Additional Notes:

  • Rounding off test results must follow IS 2:1960 rules.
  • Use IS specified test methods for all quality checks.

flowchart TD
    A[Bitumen Storage] --> B[Cast into Blocks]
    B --> C[Mark Date & Manufacturer]
    A --> D[Maintain Physical Properties]
    D --> E[Softening Point 50-90℃]
    D --> F[Penetration 10
10Safety and Environmental Considerations

IS 5317: Safety and Environmental Considerations - Key Points

The standard IS 5317 does not explicitly provide a dedicated clause on Safety and Environmental Considerations. However, relevant specifications and quality controls indirectly ensure safety and environmental compliance:

Key Specifications for Bitumen (Table 1)

CharacteristicRequirementTest Method (IS No.)
Softening point (Ring and Ball method)50 - 90 °CIS 1205
Penetration at 25°C (1/100 cm)10 to 40IS 1203
Ductility at 27°C, minimum (cm)3IS 1208
Loss on heating, maximum (%)1IS 1212
Solubility in carbon disulphide, minimum (%)99IS 1216
  • These parameters ensure bitumen quality, minimizing environmental hazards due to volatile emissions or improper binder performance.
  • Heating loss limits control emissions during processing.
  • High solubility ensures purity, reducing harmful residues.

Environmental & Safety Compliance Notes

  • Use bitumen grades conforming to IS 73 (paving bitumen) or IS 702 (industrial bitumen) to meet safety and environmental standards.
  • Follow IS 2:1960 for rounding off test results to maintain accuracy and consistency.
  • BIS certification (Clause 8.2.1) ensures products meet regulatory safety and environmental norms.

Summary Diagram: Bitumen Quality Control Impact on Safety & Environment

flowchart LR
    A[Bitumen Properties] --> B[Softening Point]
    A --> C[Penetration]
    A --> D[Ductility]
    A --> E[Loss on Heating]
    A --> F[Solubility]
    B & C & D & E & F --> G[Ensures Quality & Purity]
    G --> H[Reduced Emissions & Environmental Impact]
    G --> I[Safe Handling & Usage]

Recommendation: For comprehensive safety and environmental guidelines, refer additionally to IS 73, IS 702, and related environmental regulations applicable to bitumen handling and road construction.

Annex AReferenced Indian Standards

IS 5317 - Referenced Indian Standards: Key Points

The standard references multiple IS codes essential for bitumen and aggregate testing:

IS No.Title
IS 73:1992Specification for paving bitumen
IS 334:1982Glossary of terms relating to bitumen and tar
IS 702:1998Specification for industrial bitumen
IS 1195:2002Bitumen mastic for flooring
IS 1203:1978Determination of penetration
IS 1205:1978Determination of softening point
IS 1208:1978Determination of ductility
IS 1212:1978Determination of loss on heating
IS 1216:1978Determination of solubility in carbon disulphide
IS 2386 (Part 4):1963Methods of test for aggregates for concrete: Mechanical properties

Important Notes:

  • Terminology: Use definitions from IS 334:1982.
  • Certification: Use of the BIS Standard Mark follows the Bureau of Indian Standards Act, 1986 (Clause 8.2.1).
  • Always verify the latest editions of these standards for compliance.

Typical Test Formula Examples:

  • Penetration Test (IS 1203):
    Depth (mm) = Distance needle penetrates bitumen under standard load/time/temp.

  • Softening Point (IS 1205):
    Temperature (°C) at which bitumen softens under specified conditions.

  • Ductility (IS 1208):
    Length (cm) bitumen sample stretches before breaking.


flowchart LR
    A[IS 5317 Standard] --> B[Bitumen Specs]
    B --> C[IS 73, IS 702, IS 1195]
    A --> D[Bitumen Tests]
    D --> E[Penetration (IS 1203)]
    D --> F[Softening Point (IS 1205)]
    D --> G[Ductility (IS 1208)]
    A --> H[Aggregate
Annex BCommittee Composition

IS 5317 - Committee Composition & Key Specifications

  • The Committee responsible for IS 5317 formulation is detailed in Annex B (not provided here).
  • The Committee is likely from the Flooring, Wall Finishing and Roofing Sectional Committee, CED 5 (Clause 7.4).

Key Table: Composition of Pitch-Mastic (Without Coarse Aggregates) — Table 3, Clause 5.2

ComponentMinimum %Maximum %
Bitumen1417
Passing 75-micron IS Sieve2545
Passing 212-micron & retained on 75-micron818
Passing 600-micron & retained on 212-micron430
Passing 236-micron & retained on 600-micron022
  • Analysis per Annex D of IS 1195.
  • Ensures anti-skid properties and durability.

Summary Diagram: Committee & Specification Flow

flowchart TD
    A[Flooring, Wall Finishing & Roofing Committee (CED 5)] --> B[Formulates IS 5317]
    B --> C[Defines Composition Limits (Table 3)]
    C --> D[Analysis Method (Annex D, IS 1195)]
    D --> E[Ensures Quality & Anti-skid Properties]

Use this table and method for verifying pitch-mastic composition as per IS 5317.

Popular Questions About IS 5317

?What are the specified bitumen grades suitable for pitch-mastic according to IS 5317?

According to IS 5317 (2002), the specified bitumen grades suitable for pitch-mastic are chosen based on temperature conditions, especially for pavement temperatures exceeding 50°C.

Key Points on Bitumen Grades for Pitch-Mastic:

  • Harder grade bitumen is recommended for pitch-mastic, particularly in hot climates.
  • Bitumen content in pitch-mastic ranges between 14% to 17% by mass (Table 3).
  • Bitumen is heated to 170-180°C before mixing with aggregates.
  • The standard revision emphasizes using bitumen grades that resist softening and bleeding at high temperatures.

Typical Bitumen Grades (as per IS 73 and IS 1203 standards, commonly referenced):

Bitumen GradeSuitable Temperature RangeApplication Notes
VG 30Up to 50°CNormal conditions
VG 40 or VG 50Above 50°CHot climates, reduces bleeding

Summary:

  • Use VG 40 or VG 50 grade bitumen for pitch-mastic in areas where pavement temperature exceeds 50°C.
  • Ensure bitumen content is within 14-17% by mass of mastic (without coarse aggregates).

This ensures durability, shock absorption, and resistance to bleeding in pitch-mastic surfacing.

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This approach aligns with IS 5317 recommendations for durable pitch-mastic surfacing.

?How is the hardness number of pitch-mastic determined and what are acceptable ranges?

Hardness Number Determination for Pitch-Mastic (IS 5317)

  • Before mixing coarse aggregate (Clause 6.1):

    • Hardness number at 25°C should be 60 to 80.
    • This is for the pitch-mastic composition as per Table 3 before adding aggregate.
  • After adding coarse aggregate (Clause 6.2):

    • Hardness number at 25°C reduces to 10 to 20.
    • This reflects the pitch-mastic composition after incorporating coarse aggregate (5.3).

Testing Method:

  • Hardness is typically measured using a Durometer or similar hardness tester at 25°C.
  • The test ensures the mastic has proper plasticity and durability before and after aggregate addition.

Summary Table

StageHardness Number @ 25°CNotes
Pitch-mastic only (pre-agg)60 – 80Before mixing coarse aggregate
After addition of coarse aggregate10 – 20Ensures proper plastic condition for laying

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Ensure hardness values conform to these ranges for quality and performance compliance.

?What types and gradings of aggregates are required for pitch-mastic composition?

IS 5317 Requirements for Aggregates in Pitch-Mastic Composition

  • Coarse Aggregate:

    • Hard, durable crushed rock.
    • Aggregate Impact Value (IS 2386 Part 4): ≤ 20.
    • Abrasion Value: ≤ 40.
    • Size: 6 to 20 mm normal size.
    • Quantity: 30% to 50% by mass of final mixture (as per design).
  • Fine Aggregates and Filler:

    • Mixed and heated (170–205°C) before adding bitumen.
  • Anti-Skid Layer:

    • Coarse/carborundum aggregate size: 12 to 20 mm.
    • Application rate: 2 to 13 kg/m².
    • Coated with 2-3% S95 or S65 bitumen + 2-3% filler.
    • Rolled into hot mastic surface for adhesion.
  • Mixing Temperatures:

    • Bitumen heated to 170–180°C.
    • Mastic cooker temperature: 170–205°C (max).

Summary Table

Aggregate TypeSize (mm)% by MassImpact ValueAbrasion ValueNotes
Coarse Aggregate6–2030–50%≤ 20≤ 40Crushed rock, durable
Anti-Skid Aggregate12–202–13 kg/m²Coated with bitumen & fillerApplied on hot mastic surface

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This ensures durable, skid-resistant pitch-mastic with specified hardness (60-80 at 25°C).

?What manufacturing temperature controls are recommended to ensure quality?

IS 5317 Manufacturing Temperature Controls Summary:

  • Reheating temperature for blocks: 170°C to 205°C (Clause 5.3)
  • Mixing temperature for discharge samples: 150°C to 205°C (Clause 7.1)
  • Coarse aggregate size: 6 to 20 mm, 30% to 50% by mass (Clause 5.3)
  • Temperature range ensures: Proper incorporation of aggregates and consistency in pitch-mastic quality.

Key points:

  • Maintain 170°C to 205°C during reheating to avoid degradation of binder.
  • Ensure thorough mixing at 150°C to 205°C during discharge sampling.
  • Control temperature precisely to maintain desired hardness and workability.
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Maintaining these temperature controls is critical for quality and durability of the final product.

?How is the anti-skid property of pitch-mastic achieved and tested?

Anti-Skid Property of Pitch-Mastic (IS 5317 Clause 5.3.1):

  • Achieved by:

    • While the pitch-mastic is still hot and plastic, it is covered with a layer of coarse/carborundum aggregate (12–20 mm size).
    • Aggregate quantity: 2 to 13 kg/m² or about 0.15 to 0.2 m² per 100 m² of mastic surface.
    • The coarse aggregate is pre-coated with 2–3% by weight of S95 or S65 grade bitumen + 2–3% filler to improve bonding.
    • The aggregate is then rolled or pressed firmly into the mastic surface to embed it.
  • Testing:

    • Anti-skid effectiveness is verified by running a pump integrator over the newly laid mastic surface to ensure proper aggregate embedment and skid resistance.

Summary Table: Anti-Skid Treatment

ParameterValue/Range
Aggregate size12 to 20 mm
Aggregate quantity2 to 13 kg/m²
Bitumen coating on aggregate2 to 3% (S95 or S65 grade)
Filler coating on aggregate2 to 3%
Testing methodPump integrator run
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This process ensures a durable, skid-resistant surface suitable for bridge decks and roads.

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