1、Designation: C882/C882M 12C882/C882M 13Standard Test Method forBond Strength of Epoxy-Resin Systems Used With ConcreteBy Slant Shear1This standard is issued under the fixed designation C882/C882M; the number immediately following the designation indicates the yearof original adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope Scope*1.1 This
3、 test method covers the determination of the bond strength of epoxy-resin-base bonding systems for use withportland-cement concrete. This test method covers bonding hardened concrete to hardened or freshly-mixed concrete.1.2 The values stated in either SI units or inch-pound units are to be regarded
4、 separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety
5、 concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. A specific hazard statement is given in Section 8.(Warning Fresh hydraulic ceme
6、ntitious mixtures arecaustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure.2)2. Referenced Documents2.1 ASTM Standards:3C39/C39M Test Method for Compressive Strength of Cylindrical Concrete SpecimensC109/C109M Test Method for Compressive Strength of Hydraulic Cement
7、 Mortars (Using 2-in. or 50-mm Cube Specimens)C125 Terminology Relating to Concrete and Concrete AggregatesC150 Specification for Portland CementC192/C192M Practice for Making and Curing Concrete Test Specimens in the LaboratoryC470/C470M Specification for Molds for Forming Concrete Test Cylinders V
8、erticallyC511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of HydraulicCements and ConcretesC617 Practice for Capping Cylindrical Concrete SpecimensC881/C881M Specification for Epoxy-Resin-Base Bonding Systems for Concrete3. Terminology3.1
9、Definitions:3.1.1 For definitions of terms used in this specification, refer to Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 bonding system, nthe product resulting from the combination of all the components supplied for use as a bondingmaterial.3.2.2 component, na consti
10、tuent that is intended to be combined with one or more other constituents to form a bonding system.3.2.3 contact strength, nbond strength measured by slant shear after a specified contact and cure time.1 This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggreg
11、atesand is the direct responsibility of Subcommittee C09.25 onOrganic Materials for Bonding.Current edition approved May 1, 2012June 15, 2013. Published June 2012August 2013. Originally approved in 1978. Last previous edition approved in 20052012 asC882/C882M0512.1. DOI: 10.1520/C0882_C0882M-12.10.1
12、520/C0882_C0882M-13.2 See Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol. 04.02.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolum
13、e information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequa
14、tely depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM In
15、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.4 contact time, nspecified time between when the bonding system is applied and when the two segments are bondedtogether and still achieve a specified bond strength after a specified curing time and t
16、emperature.3.2.5 formulator, nthe agency responsible for preparing the separate components and for recommending the proportions to beused in preparing the final bonding system.4. Summary of Test Method4.1 The bond strength is determined by using the epoxy system to bond together two equal sections o
17、f a 75 by 150-mm 3 by6-in. portland-cement mortar cylinder, each section of which has a diagonally cast bonding area at a 30 angle from vertical.Aftersuitable curing of the bonding agent, the test is performed by determining the compressive strength of the composite cylinder.5. Significance and Use5
18、.1 The strength developed by a bonding system that joins two regions of concrete is its most important property.6. Apparatus6.1 Apparatus to Mix Portland-Cement MortarThis apparatus shall be as described in Test Method C109/C109M, except forthe sections on specimen molds, tamper, and testing machine
19、.6.2 Specimen MoldsThe molds shall be constructed in the form of right cylinders,meet the requirements of SpecificationC470/C470M and be 75 6 2 mm 3 6 116 in. in inside diameter and 150 6 2 mm 6 6 116 in. high. All molds shall be eitherselected or machined so that the maximum range of the difference
20、s in each of the dimensions of the group of molds is less than0.5 mm in height. 164 in. The molds shall be made of metal not attacked by portland-cement mortar. The side of the mold shallbe sufficiently rigid to prevent spreading or warping. The molds shall be made watertight before use. A satisfact
21、ory material forthis purpose is the paraffin-rosin mixture described in Test Method C109/C109M.6.3 Dummy SectionA dummy section (Fig. 1) shall be machined of a hard material that is not attacked by portland-cementmortar. It shall fit the mold and be equal to half the volume of the cylinder, but at a
22、n angle of 30 from the vertical. Additionaldummy sections can be made by casting an epoxy-resin mortar against the machined dummy section contained in a specimen mold.Due precautions, such as waxing, shall be taken to prevent the bonding of the epoxy-resin mortar to the machined dummy sectionor the
23、mold.6.4 Tamping RodThe tamping rod shall be a round rod of brass or plastic, 10 mm A 10-mm 3/8-in. 38 in. in diameter andapproximately 12 in. 300 mmdiameter tamping rod, as described in Practice C192/C192Mlong, having both ends rounded tohemispherical tips6.5 Apparatus for Mixing Epoxy-Resin Bondin
24、g SystemA glass, plastic, or metal container of approximately 0.1 L 3 oz.capacity shall be used to hand-mix the bonding system. A tongue depressor or wooden stick of similar dimensions shall be usedas a paddle.6.6 Testing MachineThe testing machine shall be as described in Test Method C39/C39M.6.7 M
25、oist RoomThe moist room shall conform to the requirements of Specification C511.6.8 Temperature-Conditioning ChambersRooms or chambers in which the temperature is maintained appropriate to the classof the resin system being tested, in accordance with Specification C881/C881M.Dimensionsmm in.ADiamete
26、r 752 3.000BHeight 1402 5.598CSlant height 1502 6.000DBase height 102 0.402FIG. 1 Dummy SectionC882/C882M 1327. Materials7.1 Laboratory conditions, materials, proportions, and procedures for mixing the portland-cement mortar shall be in accordancewith Test Method C109/C109M. A Type III cement (Speci
27、fication C150) shall be used.7.1 Portland Cement Mortar Specimens Lightly oil the dummy section and the cylinder mold. Position the dummy section inthe mold with the slant side up. Place the portland-cement mortar in the mold in three layers of approximately equal volume. Rodeach layer with 25 strok
28、es of the tamping rod. Distribute the strokes uniformly over the section and rod deeply enough to penetrateinto any underlying layer. Rod the bottom layer as deeply as possible. Strike off the surface of the top layer with the trowel, andcover the specimen and mold with a glass or metal plate. Cure
29、the mortar half-cylinder in accordance with PracticeLaboratoryconditions, materials, proportions, and procedures for mixing the portland-cement mortar shall be in accordance with TestC192/C192MMethod C109/C109Mfor at least 28 days. Then. A Type III cement (Specification C150dry the half-cylinder inl
30、aboratory air for at least 7 days. As an alternative, a complete 75 by 150 mm 3 by 6-in. cylinder shall be cast and, after cure,may be saw-cut at an angle of 30.) shall be used.7.1.1 Lightly oil the dummy section and the cylinder mold. Position the dummy section in the mold with the slant side up. P
31、lacethe portland-cement mortar in the mold in two layers of approximately equal volume. Rod each layer with 25 strokes of thetamping rod. Distribute the strokes uniformly over the section and rod deeply enough to penetrate into any underlying layer. Rodthe bottom layer as deeply as possible. Strike
32、off the surface of the top layer with the trowel, and cover the specimen and moldwith a glass or metal plate. Cure the mortar half-cylinder in accordance with Practice C192/C192M for at least 28 days. Then drythe half-cylinder in laboratory air for at least 7 days. As an alternative, a complete 75 b
33、y 150 mm 3 by 6-in. cylinder shall becast and, after curing for 28 days, may be saw-cut at an angle of 30.7.1.2 A 75 by 150-mm 3 by 6-in. cylinder of the mortar shall have a compressive strength, when tested in accordance with11.3, of at least 31 MPa 4500 psi at 28-days age (see Note 1).NOTE 1Calcul
34、ations for bond strength are determined based on the elliptical bonding surface of the cut cylinder. For an angle of 30 from the verticalthis corresponds to exactly twice the surface area of the base of the assembled cylinder. Use of mortar with the minimum compressive strength listed inSection 7.1.
35、2 will only provide a qualitative pass/fail result for bond strengths exceeding approximately 13 MPa 1900 psi. If quantitative results aredesired it is recommended the mortar compressive strength of the mortar exceed the anticipated bond strength by a factor of 2.5 or more.7.2 Bonding SystemA75 by 1
36、50-mm 3 by 6-in. cylinder of the mortar shall have a compressive strength, when tested in Thebonding systems covered by this test method shall be furnished in two or more components for combining immediately prior touse in accordance with 11.3, of at least 31 MPa 4500 psi at 28-days age.the written
37、instructions of the manufacturer.7.3 Polyethylene FilmFilm thickness of 100 m 4 mil cut into 150 500 mm 6 30 in. sections.7.4 Masking Tape.7.5 Paraffn Wax.8. Hazards8.1 WarningEpoxy resins contain irritants, especially to the skin, eyes, and respiratory system. Persons handling thesematerials shall
38、use appropriate protective clothing, including rubber or plastic gloves. If an epoxy resin should contact the skin,it shall be removed immediately with a dry cloth or paper towel, and the area of contact shall be washed thoroughly with soap andwater. Solvents shall not be used, because they carry th
39、e irritant into the skin. Cured epoxy resins are innocuous.9. Sampling9.1 Take samples in accordance with Specification C881/C881M.10. Test Specimens10.1 Three composite test specimens are required for all Types of resin systems.10.2 Conditioning:10.2.1 Types I, III, IV, VI, and VII SystemsCondition
40、 the resin system components, the mortar sections, and all equipment thatwill contact the resin to the temperatures specified in Specification C881/C881M.10.2.1.1 Prepare the test specimens and make provision for maintaining them at the appropriate temperature during the entirecure time. Prepare the
41、 surface to be bonded by sandblasting and dry brushing to remove all loose surface material.10.2.1.2 Use mortar sections and assemblies that have been soaked in water for 24 h. Place the face of the mortar sections tobe bonded on an absorbent material for 10 min prior to applying the adhesive. For a
42、ssembled test specimens, remove all water byshaking. Allow to air dry for 15 min.10.2.2 Type II and Type V SystemsSince Type II and Type V resins are appropriate for use only at temperatures that permitstrength gain of the freshly prepared concrete, only the conditioning temperature for a Class C re
43、sin, 23 6 1 C 73 6 2 F, needbe provided.10.3 Specimen Preparation:C882/C882M 13310.3.1 Type I, III, IV, VI, and VII, Grade 2 or 3 SystemsTwo mortar sections will be needed for each test specimen. Wrap 100m 4 mil of polyethylene film 150 by 500 mm 6 by 20 in. around one section of each pair, even wit
44、h the base and secure withmasking tape. Thoroughly mix the components of the bonding system in the proportions recommended by the formulator.Amixingtime of 3 min should suffice. Support the film-wrapped mortar section so that the prepared bonding surface is horizontal.10.3.1.1 To test Grade 2 system
45、s, apply a 0.5 mm 0.02 in. layer of the bonding systems to the prepared elliptical surface ofthe film wrapped mortar section. Using Grade 3 systems, apply a 0.5 mm 0.02 in. layer of bonding system on the preparedelliptical surface of the mortar section not film wrapped. For the determination of cont
46、act strength (Specification C881/C881M)of Type VI and VII systems, apply a 2.0-mm 116-in. layer to the prepared elliptical surface of both mortar sections.10.3.1.2 Insert mortar sections not film wrapped into the cylinder formed by film surrounding other mortar sections and squeezeout the excess res
47、in through a hole, or holes, punched in the film at the bondline, while keeping the joint horizontal. Secure theassembly with sufficient additional masking tape placed around the film. Be sure the joint is entirely filled. Keep the bonded jointhorizontal for 48 h, then remove all the masking tape.10
48、.3.2 Type I, III, and IV, Grade 1 SystemsTwo mortar sections will be needed for each test specimen. Prepare the ellipticalbonding surface as described in 10.2. Place the two halves of the specimen together, forming a gap approximately 0.5 mm 0.02in. Wrap masking tape around the periphery of the spec
49、imen close to each end. Place additional tape along the joint. Coat thetape over the joint with hot paraffin to help contain the epoxy when it is poured into the slit. Support the specimen so that the tapedjoint is vertical. Cut a slit in the tape to expose approximately 20 mm 34 in. of the upper portion of the joint. Slowly pour theresin bonding system into the exposed joint until it is completely filled. Keep the joint vertical for 48 h, then remove all maskingtape.
