AZA 0965 PRD MOULD BS 590:10

Description

The PRD Mould BS 598:110 is a specialized cylindrical steel mould designed for preparing compacted asphalt mix samples as part of the Percentage Refusal Density (PRD) test. This standard test is used in road construction quality control to determine the maximum density a bituminous mix can achieve under laboratory compaction conditions, simulating the effect of site compaction methods.PRD Mould BS 598:110, bituminous mix mould, asphalt testing, bitumen density test, standard PRD mould.

At Azalab, we supply PRD Moulds that strictly conform to British Standard BS 598:110, ensuring accurate, reproducible test results in both commercial labs and government highway quality assurance projects.

What Is the PRD Test?

The PRD test is a method for assessing the refusal density of a bituminous mixture, i.e., the maximum achievable compaction. The test determines the void content in a mix after subjecting it to a known number of blows using a PRD hammer. The resulting density is compared with the field-compacted density to evaluate how close the field conditions come to laboratory standards.

The PRD Mould is an essential part of this process, acting as the container in which the hot mix is compacted. A sample that fills this mould is subjected to compaction blows using a PRD compaction hammer. The mass and volume of the sample after compaction are then used to calculate the density.

Key Features:

• Manufactured from precision-machined steel for long-term accuracy

• Internal dimensions and tolerances conform to BS 598:110

• Withstands repeated heating and mechanical compaction

• Used with PRD hammer and BS-compliant baseplate

• Easy to clean and maintain between uses

• Provides consistent mould shape for reproducible compaction

Applications:

• Asphalt mix design verification

• Highway engineering laboratories

• Contractor quality control departments

• Civil engineering research and academia

The PRD Mould is critical for maintaining consistency across different mixes, comparing contractor field samples with target lab results, and establishing mix suitability for heavy-traffic roads or climate-sensitive areas.

Construction:

The mould is cylindrical in shape, made from hardened steel or cast iron, and is precision-ground to meet the required internal diameter and height specifications. It is generally used along with a metal collar and baseplate for assembling the full PRD setup.

A key benefit of using Azalab’s PRD Mould is its dimensional reliability. Poor-quality moulds can cause errors in compaction volume, leading to inaccurate density calculations and potentially failing materials. Our moulds undergo strict dimensional checks before shipping.

To understand more about the test, refer to the British Standard BS 598-110, titled “Sampling and examination of bituminous mixtures for roads and other paved areas – Part 110: Methods of test for the determination of density”. This standard describes the procedure, equipment, and evaluation criteria for PRD testing.

Specifications:

FREQUENTLY ASKED QUESTIONS (FAQ):

Q1: What is PRD in asphalt testing?
A1: PRD stands for Percentage Refusal Density, a measure of the maximum compaction achievable in a lab using standard methods.

Q2: Why is the PRD mould important?
A2: It provides the correct volume and shape needed for accurate lab compaction and density calculation of asphalt mixtures.

Q3: Is this mould compatible with Indian or ASTM standards?
A3: This mould is specifically made to comply with BS 598:110. ASTM-compatible versions are available separately.

Q4: What material is the mould made of?
A4: High-grade hardened steel or cast iron, chosen for durability under repeated compaction.

Q5: Can it be reused?
A5: Yes. With proper cleaning and maintenance, the mould can be reused for hundreds of compaction cycles.