ASTM D5249-95(2000)
(Specification)Standard Specification for Backer Material for Use with Cold- and Hot-Applied Joint Sealants in Portland-Cement Concrete and Asphalt Joints
Standard Specification for Backer Material for Use with Cold- and Hot-Applied Joint Sealants in Portland-Cement Concrete and Asphalt Joints
SCOPE
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 following 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 (bondbreaker), 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.
1.5 The following safety hazards caveat pertains only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 5249 – 95 (Reapproved 2000)
Standard Specification for
Backer Material for Use with Cold- and Hot-Applied Joint
Sealants in Portland-Cement Concrete and Asphalt Joints
This standard is issued under the fixed designation D 5249; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 545 Test Methods for Preformed Expansion Joint Fillers
for Concrete Construction (Nonextruding and Resilient
1.1 This specification covers backer material for cold- and
Types)
hot-applied joint sealant for use in portland-cement concrete or
D 1622 Test Method forApparent Density of Rigid Cellular
asphalt-pavement joints.
Plastics
1.2 This specification establishes basic requirements for
D 1623 Test Method for Tensile and Tensile Adhesion
sealant-backer material either in rod or strip form, that can
Properties of Rigid Cellular Plastics
withstand the temperature of hot- or cold-applied sealants
D 5535 Terminology Relating to Formed-in-Place Sealants
without excessive deformation.
for Joints and Cracks in Pavement
1.3 Sealant backer material serves one or more of the
E 1 Specification for ASTM Thermometers
following purposes:
1.3.1 Limits the amount and depth of sealant applied to a
3. Terminology
joint,
3.1 For definitions, refer to Terminology D 5535.
1.3.2 Acts as a barrier interface to prevent backside adhe-
sion (bondbreaker), and
4. Classification
1.3.3 Provides a form to assist the sealant in developing a
4.1 Sealant backer material is available in three types:
shape factor.
4.1.1 Type 1, shall be round rods of various diameters
1.4 The values stated in inch-pound units are to be regarded
intended for use with cold- and hot-applied sealants.
as the standard. The values in parentheses are for information
4.1.2 Type 2, shall be sheets or strips of various thicknesses,
purposes only.
laminated or skived by the manufacturer but capable of being
1.5 The following safety hazards caveat pertains only to the
field laminated and used with cold- and hot-applied sealants.
test methods described in this specification. This standard does
4.1.3 Type 3, shall be round rods of various diameters
not purport to address all of the safety concerns, if any,
limited for use with cold-applied sealants.
associated with its use. It is the responsibility of the user of this
4.2 Type 1 and Type 3 rod materials are intended for use
standard to establish appropriate safety and health practices
primarily where there is a reservoir, either already existing or
and determine the applicability of regulatory limitations prior
formed, such as a contraction joint, where the rod will limit the
to use.
sealant depth and prevent the sealant from bonding to the
2. Referenced Documents bottom of the joint reservoir (bond-breaker) thus eliminating
bottom-side adhesion.
2.1 ASTM Standards:
4.3 Type 2 strip material is intended primarily for use where
C 670 Practice for Preparing Precision and Bias Statements
2 there is an opening the full depth of the pavement, such as an
for Test Methods of Construction Materials
expansion joint for which it is desirable to have a filler material
C 1016 Test Method for Determination ofWaterAbsorption
3 completely fill the opening and prevent or minimize the
of Sealant Backing (Joint Filler) Material
accumulation of water or incompressible materials below the
C 1253 Test Method for Determining the Outgassing Poten-
3 sealant.
tial of Sealant Backing
5. Ordering Information
5.1 Types1,2,and3backermaterialareavailableinarange
This specification is under the jurisdiction of ASTM Committee D04 on Road of sizes, lengths, and diameters; they are available on reels, in
and Paving Materials and is the direct responsibility of Subcommittee D04.33 on
Formed-In-Place Sealants for Joints and Cracks in Pavements.
Current edition approved Nov. 10, 1995. Published January 1996. Originally
published as D 5249 – 92. Last previous edition D 5249 – 92. Annual Book of ASTM Standards, Vol 04.03.
2 5
Annual Book of ASTM Standards, Vol 04.02. Annual Book of ASTM Standards, Vol 08.01.
3 6
Annual Book of ASTM Standards, Vol 04.07. Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 5249
coils, or in straight lengths. Consult the manufacturer for 9.4.1 Significance and Use—This test method covers a
information on how to order. procedure for measuring the force necessary to compress the
5.2 Backer material must be ordered by diameter or size in backer material, and the percentage recovery of original
relation to the joint opening, usually 25 to 35 % larger than the dimensions after removal of the compression load.
joint width. 9.4.2 Apparatus:
9.4.2.1 An apparatus shall be provided having a flat com-
6. Materials
pression plate larger than the specimen to be tested, connected
6.1 Sealant backer material shall be easily compressed and
to a force measuring device, and mounted in such a manner
installed in the joint reservoir. This material shall be heat
that the specimen can be deflected (compressed) at a speed of
resistant when used with hot-applied sealants.
0.5 to 2 in./min. The apparatus shall be arranged to support the
specimen on a level horizontal plate. The apparatus shall be
7. Physical Properties
capable of measuring the distance between the movable plate
7.1 Physical properties of the sealant backer material shall
and the stationary plate.
conform to the requirements of Table 1.
9.4.2.2 Calipers, capable of measuring 0.001 in.
9.4.3 Test Specimens:
8. Workmanship, Finish, and Appearance
9.4.3.1 Test specimens shall be 6 6 0.125 in. lengths of the
8.1 The product shall be clean, free of scale or foreign
backer material.
matter, oil, or water which could wipe off on a joint sidewall
9.4.3.2 Each test requires a minimum effective area of 3.0
2 2
and interfere with the proper cure or adhesion of the sealant.
in. Whentheeffectiveareaofasinglelengthislessthan3in. ,
multiplelengthsshallbeusedinasingletest.Whenrod-shaped
9. Test Methods
backer material is less than ⁄4in. in diameter, multiple lengths
9.1 Water Absorption— Tests for water absorption of the
are required for each test (see Table 2).
Types 1 and 3 backing material shall be made in accordance
with Test Method C 1016, Procedure B. Type 2 material shall
TABLE 2 Multiple Specimen Requirements for Rod-Shaped
be tested in accordance with Test Method D 545.
Backer Materials for Compression Recovery Testing
9.1.1 For Type 2 material:
Specimens Required for Each
Rod Diameter
W 3 100 Test
WA 5 (1)
262t
⁄4 in. or larger 1
3 5
⁄8 to ⁄8 in. 2
where: < ⁄8 in. 3
WA = water absorption by volume, %,
W = weight of water absorbed, from tests made according
to Test Methods D 545, g, and
9.4.4 Number of Test Specimens—Test three specimens for
t = thickness of 4 in. by 4 in. specimen, inches.
each sample. The values reported shall be the mean of those
9.1.2 For the purposes of this calculation,1gof water
observed.
occupies 0.061 in. at test conditions.
9.4.5 Procedure:
9.2 Density—Tests for density of Types 1 and 3 materials
9.4.5.1 Place the test specimen in the center of the support-
shall be made in accordance with Test Method D 1622. Tests
ing plate of the apparatus. Materials that are supplied in coils
fordensityofType2materialshallbemadeinaccordancewith
often have a tendency to curl. Place these samples between the
Test Methods D 545.
plates in such a manner that the arc formed by the sample is in
9.3 Tensile Strength— Tests for tensile strength of Types 1
the vertical plane.
and 3 materials shall be made in accordance with Test Method
9.4.5.2 Bring the compression plate into contact with the
D 1623.
specimen so that the entire length of the test specimen is in
9.4 Compression Deflection and Recovery—Type2material
contact with both plates. No light should be visible anywhere
shall be tested in accordance with Test Methods D 545. Type 1
between the rod and the plate, except within ⁄2 in. of the end
and3materialsshallbetestedinaccordancewiththefollowing
of the sample.
procedure.
9.4.5.3 Measure the original diameter of the rod by measur-
ing the separation of the plates of the apparatus with the
TABLE 1 Physical Property Requirements
calipers. Compress the rod 25
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