What is the required penetration value for this sealing compound?

The penetration at 25°C must be between 40 and 90 (in units of 1/10 mm) as per Table 1.

What is the maximum temperature the bitumen should be heated to for pouring?

The pouring temperature shall not exceed 180°C, as stated in Clause 3.2.

How is the bond strength evaluated?

A bond test is performed at -10°C for 5 hours. The specimen should show no signs of failure in either adhesion to the concrete blocks or cohesion within the sealant itself (Table 1 & Appendix C).

Is this sealant suitable for joints in a chemical plant?

No, this is a basic bitumen sealant. It is not designed for chemical resistance; a specialized sealant would be required for such environments.

IS 5871

: 1970

Bitumen based sealing compounds for joints in concrete

CurrentSpecializedSpecificationMaterials Science · Roofing Materials

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This standard specifies the requirements and testing methods for hot-applied, bitumen-based sealing compounds. These compounds are used for sealing expansion and contraction joints in concrete structures like pavements, canals, and roofs to prevent water ingress and protect the joint.

Specifies requirements for bitumen based sealing compounds for joints in concrete pavements and structures.

Quick Reference Values

Maximum Pouring Temperature180 °C

Maximum Flow at 75°C for 5 hours5 mm

Penetration at 25°C (150 g, 5 s)40 to 90 (in 1/10 mm)

Bond Test Requirement at -10°CNo failure in adhesion or cohesion after 5 hours

Minimum Flash Point (Pensky-Martens)230 °C

Maximum Water Content0.5 percent by mass

Practical Notes

This is an old standard for a basic type of sealant. For modern or high-performance applications, consider newer materials like polysulphide, polyurethane, or silicone-based sealants specified in other codes.

Strict adherence to the pouring temperature is critical. Overheating can damage the bitumen's properties, while underheating results in poor flow and bonding.

Proper joint preparation, including thorough cleaning, drying, and priming (if required), is essential for the long-term performance of the sealant.