What is the primary application of pitch-mastic as per IS 5317?

It is used as a waterproofing layer and wearing course for bridge decking and roads.

What is the specified binder content in pitch-mastic?

The binder content should be between 14 to 17 percent by mass of the total mix, as per Table 3.

What is the required range for the Hardness Number at 25°C?

The hardness number, which indicates its resistance to indentation, must be between 10 and 25 (Table 4).

What standard should be followed for testing the aggregates used in the mix?

The methods of test for aggregates are specified in the IS 2386 series of standards.

IS 5317

: 2002

Pitch-Mastic for Bridge Decking and Roads

CurrentSpecializedSpecificationTransportation · Flooring, Wall Finishing and Roofing

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This standard specifies the requirements for pitch-mastic used as a waterproofing and wearing course for bridge decks and roads. It covers the properties of constituent materials, the composition of the mix, and the physical requirements for the final pitch-mastic product.

Pitch-Mastic for Bridge Decking and Roads

Quick Reference Values

Binder Content by Mass14-17 %

Hardness Number at 25°C10-25

Softening Point of Binder (R&B)73 to 87 °C

Maximum Water Absorption0.10 % by mass

Maximum Loss on Heating at 170°C for 5h3 % by mass

Minimum Coarse Aggregate (8mm-2.8mm) Content30 % by mass

Practical Notes

Temperature control during mixing and laying is critical for achieving the desired properties and workability. Overheating can damage the binder.

The hardness number is a key performance indicator and should be regularly checked for quality assurance.

Ensure the concrete substrate is thoroughly cleaned, dried, and primed before applying the mastic layer to ensure proper adhesion and waterproofing integrity.