ASTM D5249-10 (R2021) pdf free download.Standard Specification for Backer Material for Use with Cold- and Hot-Applied Joint Sealants in Portland Cement Concrete and Asphalt Joints.
1.1 This specification covers backer material for cold- and hot-applied joint sealant for use in portland cement concrete or asphalt pavement joints.
1.2 This specification establishes basic requirements for sealant backer material, either in rod or strip form, that can withstand the temperature of hot- or cold-applied sealants without excessive deformation.
1 .3 Sealant backer material serves one or more of the tbflowing purposes:
1.3.1 Limits the amount and depth of sealant applied to a joint,
1 .3.2 Acts as a barrier interface to prevent backside adhesion (bond breaker), and
1.3.3 Provides a form to assist the sealant in developing a shape factor.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information purposes only.
4.3 Type 2 strip material is intended primarily for use where there is an opening the full depth of the pavement, such as an expansion joint for which it is desirable to have a tiller material completely till the opening and prevent or minimize the accumulation of water or incompressible materials below the sealant.
5. Ordering Information
5. 1 Types 1, 2, and 3 backer material are available in a range of sizes, lengths, and diameters; they arc available on reels, in coils, or in straight lengths. Consult the manufacturer for information on how to order.
5.2 Backer material must be ordered by diameter or size in relation to the joint opening, usually 25 to 35 % larger than the joint width.
6. Materials
6.1 Sealant backer material shall be easily compressed and installed in the joint reservoir. This material shall be heat resistant when used with hot-applied scalants.
7. Physical Properties
7.1 Physical properties of the sealant backer material shall conform to the requirements of Table 1.
8. Workmanship, Finish, and Appearance
8.1 The product shall be clean and free of scale or foreign matter, oil, or water which could wipe ofT on a joint sidewall and interfere with the proper cure or adhesion of the sealant.
9. Test Methods
9. 1 Water Absorption—Tests for water absorption of the Types 1 and 3 backing material shall be made in accordance with Test Method C 1016, Procedure B. Type 2 material shall be tested in accordance with Test Methods D545.
9.1.1 For Type 2 material.ASTM D5249 pdf download.