CBR (California Bearing Ratio) and Marshall filter papers are used in soil and asphalt testing, primarily for pavement design. They act as barriers to separate soil or asphalt samples from equipment like spacer discs and perforated plates during compaction and testing, ensuring accurate results.
CBR Filter Papers:
- Separation: Used to separate the spacer disc from the soil during compaction and between the soil surface and the perforated plate before soaking
- Soil Compaction: Facilitate compaction procedures in CBR testing by providing a barrier
- Types: Available in single-use (coarse filter paper) and reusable (woven wire mesh) options
- Standard Compliance: Meet standards like AASHTO T 193 and ASTM D1883
- Diameter: Typically 151mm (5.94in)
- Function: They prevent the soil from adhering to the compaction tools and allow proper drainage during the testing process.
Marshall Filter Papers:
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Purpose:Similar to CBR filter papers, they are used in Marshall testing, particularly in the Marshall mix design method for asphalt,.
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Function:Used to separate specimens from the testing apparatus during the compaction and testing of asphalt mixes
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Bitumen Content:Marshall mix design involves determining the optimal bitumen content for asphalt mixes, and filter papers play a role in the testing process,.
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Specimen Preparation:They help in preparing the asphalt specimens for stability and flow testing, which are crucial for determining the mix’s performance
In essence, both CBR and Marshall filter papers are essential components in laboratory testing procedures, ensuring the integrity and accuracy of the results obtained during soil and asphalt compaction and evaluation
What is Filter Paper used for?
The coarse grade filter paper used to separate spacer disc and soil in the CBR mold during compaction operation, or over the top surface of the soil when the compaction operation is completed.
Filter paper supplied:
100mm Marshall (pack of 1000)
150mm C.B.R (pack of 1000)