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PRD MOULD BS 590:10 AZA0965
The AZA0965 PRD Mould from AZALAB is a precision-manufactured cylindrical steel mould designed for preparing compacted bituminous mix specimens for the Percentage Refusal Density (PRD) test, in strict accordance with British Standard BS 598:110. This mould is a critical component in asphalt quality control, enabling laboratories to determine the maximum achievable density of bituminous mixtures under controlled laboratory compaction.
The PRD test simulates intensive site compaction and is widely used to assess whether field-compacted asphalt has achieved a density close to laboratory refusal density. Accurate mould dimensions are essential to ensure reliable density and void content calculations, particularly for heavily trafficked roads and performance-critical pavement layers
Description
Purpose of the PRD Test
The Percentage Refusal Density (PRD) test determines the highest density a bituminous mix can reach when subjected to a prescribed number of compaction blows using a PRD hammer. The resulting density is compared with field-compacted density to evaluate:
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Effectiveness of site compaction
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Suitability of asphalt mix design
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Potential risk of over- or under-compaction
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Long-term pavement durability
The AZA0965 PRD Mould serves as the container in which the heated bituminous mix is compacted, providing a fixed and standardized volume for accurate density determination.
Construction & Design
The AZA0965 is manufactured from high-grade hardened steel or cast iron, precision-machined and ground to maintain exact internal dimensions and tolerances specified in BS 598:110. The mould is designed to withstand repeated exposure to high temperatures and heavy mechanical compaction without deformation or dimensional drift.
It is typically used in conjunction with a BS-compliant baseplate, collar, and PRD compaction hammer, forming a complete PRD testing assembly.
Strict dimensional inspection is carried out before dispatch to ensure consistent laboratory performance and reproducible test results.
Key Features
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Fully compliant with BS 598:110
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Precision-machined internal diameter and height
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High-strength steel / cast iron construction
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Resistant to thermal cycling and impact loads
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Smooth internal surface for easy sample extraction
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Long service life with minimal maintenance
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Ensures accurate and repeatable density calculations
Applications
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Percentage Refusal Density (PRD) testing
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Asphalt mix design verification
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Highway and airport pavement quality control
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Contractor QA/QC laboratories
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Government and third-party testing agencies
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Academic and research institutions
The AZA0965 PRD Mould is particularly important when comparing laboratory refusal density with field density results to confirm compliance with specification limits.
Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | AZA0965 |
| Standard Compliance | BS 598:110 |
| Material | Hardened Steel / Cast Iron |
| Internal Diameter | As per BS 598:110 (typically ~101 mm) |
| Height | As per BS 598:110 |
| Surface Finish | Smooth, rust-resistant |
| Application | PRD compaction of bituminous mixes |
| Accessories Used With | PRD hammer, baseplate, collar |
| Reuse Capability | High (with proper cleaning) |
Why Choose AZA0965 PRD Mould?
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Dimensional Accuracy – Prevents volume-related density errors
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Standards Compliance – Fully aligned with BS 598:110 requirements
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Durability – Designed for repeated laboratory compaction cycles
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Consistency – Enables reproducible results across different labs and projects
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Essential QC Tool – Critical for evaluating compaction efficiency and mix suitability
Frequently Asked Questions (FAQ)
Q1: What does PRD mean in asphalt testing?
A1: PRD stands for Percentage Refusal Density, representing the maximum density achievable in the laboratory under standardized compaction.
Q2: Why is a PRD mould necessary?
A2: The mould provides a fixed, standard volume required for accurate compaction and density calculations of bituminous mixes.
Q3: Is AZA0965 compatible with ASTM or Indian standards?
A3: AZA0965 is specifically manufactured to BS 598:110. ASTM or IS-compliant moulds are available as separate models.
Q4: What material is used in the mould?
A4: High-grade hardened steel or cast iron for durability and dimensional stability.
Q5: Can the mould be reused?
A5: Yes. With proper cleaning and care, the mould can be reused for hundreds of test cycles without loss of accuracy.
AZA0965 – Precision PRD Mould for Reliable Asphalt Density Evaluation
A critical accessory for laboratories focused on accurate compaction control, compliance, and pavement performance assurance.
Additional information
| Standard Compliance |
BS 598:110 |
|---|---|
| Material |
Hardened Steel or Cast Iron |
| Internal Diameter |
As per BS 598:110 (typically ~101 mm) |
| Height |
As per BS 598:110 |
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