1、Designation: C 869 91 (Reapproved 2006)Standard Specification forFoaming Agents Used in Making Preformed Foam forCellular Concrete1This standard is issued under the fixed designation C 869; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, 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.1. Scope1.1 This specification covers foaming agents specificallyformulated for making preformed foam for use
3、in the produc-tion of cellular concrete.1.2 The function of this specification is to provide the meansfor evaluating the performance of a specific foaming agent.This is accomplished by using the foaming agent in making astandard cellular concrete test batch (see Test Method C 796)from which test spe
4、cimens are cast. Then, significant propertiesof the concrete are determined by tests and compared with therequirements of Section 3.1.3 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2C 796 Test Method for Foaming Agents for Use in P
5、roduc-ing Cellular Concrete Using Preformed Foam3. Performance Requirements3.1 The test batch shall conform to the requirements pre-scribed in Table 1.4. Test Methods4.1 The foaming agent being tested shall be used in makingthe test specimens required.4.2 For each of the properties listed in Table 1
6、, the testprocedure, the number and type of test specimens, and themethod of molding, curing, and testing shall be as described inTest Method C 796.5. Keywords5.1 cellular concrete; foaming agents1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates,
7、and is the direct responsibility of SubcommitteeC09.23 on Chemical Admixtures.Current edition approved July 1, 2006. Published August 2006. Originallyapproved in 1977. Last previous edition approved in 1999 as C 869 91 (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orco
8、ntact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Physical RequirementsProperty RequirementDensityThe density shall satisfy either ofthe following:Density after pumping (see Tes
9、t MethodC 796)40 6 3 lb/ft3(641 6 48 kg/m3)Oven dry densityA(see Test Method C 796)For Type I cement 30.4 6 2.5 lb/ft3(4876 40 kg/m3)For Type III cement 29.3 6 2.5 lb/ft3(4696 40 kg/m3)Compressive Strength (see Test MethodC 796), min200 psi(1.4 MPa)Tensile Splitting Strength (see Test MethodC 796),
10、min25 psi(0.17 MPa)Water Absorption (see Test Method C 796),max25 % by volumeLoss of Air During Pumping(see Test MethodC 796), maxB4.5 % by volumeAFor this comparison, the calculated oven-dry density of the test batch may bedetermined by assuming that the water of hydration is 20 % of the weight of
11、thecement. Then the oven2dry density 5Wc1 0.2 Wc!Vbatch, where Wc= weight ofcement; and Vbatch= volume of batch.For example: using the test batch specified in Test Method C 796, for Type Icement ( Wc= 100 lb; WTW/Wc= 0.58, where WTW= total weight of water), thetotal weight of materials is 100 + 0.58
12、 3 100 = 158 lb (71.67 kg). For a wet density,after pumping, of 40 lb/ft3(641 kg/m3), the batch volume is 158/40 = 3.95 ft3(0.11185 m3). The calculated oven dry density is then (100 + 0.2 3 100)/3.95 = 30.4 lb/ft3or (45.36 + 0.2 3 45.36)/0.11185 = 487 kg/m3. Finally, the oven-dry density as determin
13、ed by Test Method C 796 shall be 30.4 6 2.5 lb/ft3(487 640 kg/m3).BThe loss of air during pumping includes air that is accidently entrapped duringmixing of the concrete.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM Internation
14、al 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 advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their
15、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 reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be
16、addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,
17、 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 869 91 (2006)2
