1、Designation: C 811 98 (Reapproved 2003)Standard Practice forSurface Preparation of Concrete for Application ofChemical-Resistant Resin Monolithic Surfacings1This standard is issued under the fixed designation C 811; the number immediately following the designation indicates the year oforiginal adopt
2、ion or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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.
3、Scope1.1 This practice provides for the preparation of concrete toreceive resinous monolithic surfacings. In these recommenda-tions, the term monolithic surfacings includes toppings applied60 mils (1.5 mm) in thickness or greater over concrete, whichcure in place, are continuously bonded to the conc
4、rete surface,and provide a continuous surfacing.1.2 The surfacings consist of fillers, resins, and hardenerswhich when properly mixed, applied and cured, bond to primedor unprimed concrete. The monolithic surfacings may be eitherreinforced or unreinforced.1.3 This practice does not restrict the meth
5、od of application.1.4 This practice is intended for use with filled resin systemssuch as those covered by Specification C 722 and is notintended to supersede specific manufacturers instructions.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use.
6、It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 722 Specification for Chemical-Resistant Resin Mono-lithic Surfacings3C 904
7、Terminology Relating to Chemical-Resistant Non-metallic MaterialsD 4258 Practice for Surface Cleaning Concrete for CoatingD 4259 Practice for Abrading ConcreteD 4260 Practice for Acid Etching ConcreteD 4262 Test Method for pH of Chemically Cleaned orEtched Concrete SurfacesD 4263 Test Method for Ind
8、icating Moisture in Concrete bythe Plastic Sheet MethodD 4285 Test Method for Indicating Oil or Water in Com-pressed Air2.2 Other Standards:ACI 308 Recommended Practice for Curing Concrete4ACI 503R-89 Use of Epoxy Compounds with Concrete43. Terminology3.1 DefinitionsFor definitions of terms used in
9、thispractice, see Terminology C 904.4. Concrete Requirement4.1 The concrete should be designed to withstand all struc-tural, thermal, mechanical stresses, and loading which willoccur during service. It must remain stable while protected bythe monolithic surfacing and be provided with all necessaryex
10、pansion, construction, control, and isolation joints to allow itto perform. Failure of the substrate to remain stable willinvariably affect the performance of the surfacing. In particular,cracking of the substrate is likely to mirror in the monolithicsurfacing.4.2 Hydrostatic pressure, water vapor g
11、radient, and capil-lary action, or any combination of these, forced against orthrough the concrete may cause adhesion failure between thetopping and the concrete surface. A waterproofing or drainagesystem may be required to address these concerns.4.3 New concrete should be cured in accordance with g
12、oodconcrete practice. See ACI-308.4.4 Film forming type curing membranes shall be removedfrom the surface of the concrete unless approved as beingcompatible by the surfacing manufacturer. The removal orcompatibility of these materials can be verified by testing inaccordance with 7.3.4.5 In placing c
13、oncrete floors, after the proper leveling ofthe concrete, it shall be wood float finished, followed by asingle pass metal trowel finish to produce a relatively laitance-free substrate. Lubricants or release agents shall not be used ontools.1This practice is under the jurisdiction of ASTM Committee C
14、03 on Chemical-Resistant Nonmetallic Materials and is the direct responsibility of SubcommitteeC03.02 on Mortar and Monolithics.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1975. Last previous edition approved in 1998 as C 811 - 98.2For referenced ASTM standar
15、ds, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from American Concrete Institute (ACI), P.O. Box 9094, FarmingtonHi
16、lls, MI 48333.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.6 Care shall be taken in selection of release agents forforms to prevent contamination of concrete resulting in subse-quent problems that could develop in bonding of the
17、 mono-lithic surfacing to the concrete.4.7 Uneven concrete surfaces should be built up with apatching material approved by the surfacing manufacturer.4.8 As a general rule, concrete substrates to receive resinousmonolithic surfacings must:4.8.1 Be designed such that the surfaces to be topped willrem
18、ain integral and continuous since the surfacing will notbridge crack displacements,4.8.2 Be free of laitance and contamination,4.8.3 Exhibit a surface tensile strength of at least 300 psi (2MPa) as determined by a surface tensile bond test, and4.8.4 Exhibit moisture content levels that are in compli
19、ancewith the surfacing manufacturers recommendations. See TestMethod D 4263.5. Surface Preparation5.1 New Concrete:5.1.1 Regardless of the method used to finish the concrete,it is necessary to ensure that all surfaces are free of laitance, oil,grease, and other materials incompatible with the surfac
20、ing.The concrete surfaces, also, must be free of fins, projections,bugholes, honeycombs, and loosely adhering concrete, dirt,and dust particles. Such methods as acid etching, abrasiveblasting, or mechanical scarification may be used. See Prac-tices D 4258, D 4259, D 4260, and Test Methods D 4262 and
21、D 4285.5.1.2 The prepared concrete shall have a roughened appear-ance which is desirable for enhancing adhesion of the mono-lithic surfacing. It shall be similar to the texture of coarsesandpaper or to a roughness standard as established by thematerial manufacturer.5.2 Old Concrete:5.2.1 Old concret
22、e may exhibit a variety of surface condi-tions. These may range from a smooth finish to a rough finishwith exposed aggregate. The concrete may have been paintedor contaminated with oils, greases, fats, or chemicals. The pHof the concrete may be checked as an aid in evaluating thecondition of the con
23、crete. See Test Method D 4262.5.2.2 Contaminated concrete shall be cleaned and neutral-ized. Methods include detergents, caustics, or acids. Paint orexisting surfacings shall be removed by mechanical means. SeePractice D 4258.5.2.3 Uneven surfaces should be built up with a patchingmaterial approved
24、by the surfacing manufacturer.5.2.4 When cleaning and patching of the concrete surfacehas been completed, abrasive blasting or mechanical scarifica-tion may proceed.5.2.5 The pH of the prepared concrete surface shall bebetween 8 and 10.5. See Test Method D 4262.6. Methods of Concrete Surface Prepara
25、tion6.1 Abrasive BlastingSee Practice D 4259.6.2 ScarifyingScarify in accordance with surfacing manu-facturers recommendations to obtain the proper profile on thesurface of the concrete.6.3 Alternate MethodsAs with other methods, the crite-rion of a clean strong concrete surface with good bondingpro
26、file must be maintained.6.3.1 High pressure water cleaning, impact tools, and needleguns are alternate methods that can be used in the surfacepreparation of the concrete.6.4 Acid EtchingIn the past, acid etching has been con-sidered as a complete, reliable method of surface preparation,but experienc
27、e has indicated that it is not as dependable asmechanical abrasion. Acid etching is now only recommendedfor areas where no alternative means of surface preparation arepossible. If acid etching must be employed, it should beperformed by those experienced in its use. See PracticeD 4260.7. Tests for Su
28、rface Preparation of Concrete7.1 MoistureIn cases where there is a question about themoisture content, evaluate the concrete in accordance with TestMethod D 4263 or other suitable test procedures and treatsurfaces in accordance with the surfacing manufacturersrecommendations.7.2 TemperatureThe surfa
29、ce temperature of the concreteand the ambient air temperature near to the concrete at the timeof the monolithic application shall be in accordance with thesurfacing manufacturers instructions.7.3 Concrete Surface Tensile Bond StrengthThe surfacetensile bond strength of the prepared concrete substrat
30、e may bedetermined by the pipe cap bond test which consists of bondinga commercial pipe cap to the concrete surface with epoxy, andattaching a test apparatus to the top of the pipe cap to measurethe pulling force required to break the bond. SeeACI 503R-89,Appendix A, Test Method A.1, Field Test for
31、Surface Sound-ness and Adhesion. The results of such testing in 7.3 shall alsoshow a portion of the concrete being pulled. If bond is lost atthe surface of the concrete, even though the noted minimumtensile bond strengths are reached but no concrete is pulled, thesuitability of the prepared surface
32、may be in question.8. Keywords8.1 chemical-resistant monolithic surfacings; surface prepa-rationC 811 98 (2003)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advis
33、ed that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either r
34、eapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If
35、you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 811 98 (2003)3
