ISO 1920-1-2004 Testing of concrete - Part 1 Sampling of fresh concrete《混凝土试验 第1部分 新浇混凝土的取样》.pdf

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1、 Reference number ISO 1920-1:2004(E) ISO 2004INTERNATIONAL STANDARD ISO 1920-1 First edition 2004-06-15 Testing of concrete Part 1: Sampling of fresh concrete Essais du bton Partie 1: chantillonnage du bton frais ISO 1920-1:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In acco

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6、Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reservedISO 1920-1:2004(E) ISO 2004 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of nat

7、ional standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Interna

8、tional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the r

9、ules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by a

10、t least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1920-1 was prepared by Technical Committee ISO/

11、TC 71, Concrete, reinforced concrete and pre- stressed concrete, Subcommittee SC 1, Test methods for concrete. This first edition of ISO 1920-1 cancels and replaces ISO 2736-1:1986, Concrete tests Test specimens Part 1: Sampling of fresh concrete. ISO 1920 consists of the following parts under the g

12、eneral title Testing of concrete: Part 1: Sampling of fresh concrete Part 2: Properties of fresh concrete Part 3: Making and curing test specimens Part 4: Strength of hardened concrete Part 5: Properties of hardened concrete other than strength Part 6: Sampling, preparing and testing concrete cores

13、Part 7: Non-destructive tests on hardened concrete INTERNATIONAL STANDARD ISO 1920-1:2004(E) ISO 2004 All rights reserved 1Testing of concrete Part 1: Sampling of fresh concrete WARNING When cement is mixed with water, alkali is released. When sampling, prevent skin contact with wet cement or concre

14、te by wearing suitable protective clothing (gloves, footwear, safety glasses). If wet cement or concrete enters the eye, immediately wash it out thoroughly with clean water and seek medical treatment without delay. Wash wet concrete off the skin immediately. 1 Scope This part of ISO 1920 specifies p

15、rocedures for the sampling of fresh concrete. The samples are used for the testing of properties of fresh concrete, or for making test specimens to determine the properties of hardened concrete. NOTE ISO 1920-1 specifies the properties of fresh concrete and ISO 1920-3 gives the procedures for making

16、 and curing test specimens. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies

17、. ISO 1920-2, Testing of concrete Part 2: Properties of fresh concrete ISO 1920-3, Testing of concrete Part 3: Making and curing test specimens ISO 1920-4, Testing of concrete Part 4: Strength of hardened concrete 3 Terms and definitions For the purpose of this document, the following terms and defi

18、nitions apply. 3.1 batch quantity of concrete, mixed in one cycle of operation of a batch mixer, or the quantity of concrete conveyed ready-mixed in a vehicle, or the quantity discharged over 1 min from a continuous mixer 3.2 composite sample quantity of concrete consisting of a number of increments

19、, distributed through a batch or mass of concrete, which are thoroughly mixed together 3.3 spot sample quantity of concrete taken from part of a batch or mass of concrete, consisting of one or more increments that are thoroughly mixed together ISO 1920-1:2004(E) 2 ISO 2004 All rights reserved3.4 inc

20、rement quantity of concrete taken by the single operation of a scoop 4 Principle 4.1 Taking a composite sample Concrete is sampled from a stream of moving concrete or from a pile in a series of increments according to 6.2. These increments are then thoroughly mixed together. 4.2 Taking a spot sample

21、 Concrete is sampled from a stream of moving concrete or from a pile at a single point. Spot samples are not representative of the batch and should not be used to manufacture strength specimens. 5 Apparatus 5.1 Scoop, made from non-absorbent material not readily attacked by cement paste, with a size

22、 suitable for taking increments of concrete. 5.2 Containers, one or more, made from non-absorbent material not readily attacked by cement paste, for receiving, transporting and remixing the concrete samples. 5.3 Thermometer (when required), to measure the temperature of fresh concrete to an accuracy

23、 of 1 C. 5.4 Moist cloth. 6 Sampling procedure 6.1 Sampling plan Decide whether a spot sample or a composite sample is to be taken. NOTE This will depend upon the intended use of the sample. Take a sample that is at least 1,5 times the quantity estimated as being required for the test. A procedure f

24、or monitoring sampling errors is described in Annex A. 6.2 Obtaining a composite sample Ensure that the apparatus is clean and dampen it with a moist, but not wet, cloth prior to use. Using the scoop (5.1), take the required number of increments uniformly distributed throughout the batch. When sampl

25、ing from a stationary batch mixer or ready-mixed concrete truck, disregard the very first and the very last of the discharge. When sampling from a falling stream, the increments shall be taken in such a way as to represent the whole width and thickness of the stream. If the batch has been deposited

26、in a heap of concrete, take the increments, wherever possible, distributed through the depth of the concrete as well as over the exposed surface. Samples shall not be taken from parts of the concrete that are obviously different from the rest of the pile, such as from areas that are oversanded or st

27、oney. ISO 1920-1:2004(E) ISO 2004 All rights reserved 3The increments shall be taken from at least three places. Deposit the increments into the container(s) (5.2). Record the date and time of sampling. 6.3 Obtaining a spot sample Ensure that the apparatus is clean and dampen it with a moist, but no

28、t wet, cloth prior to use. Using the scoop (5.1), take the increment(s) from the required part of a batch or mass of concrete. Deposit the increment(s) into the container (5.2). Record the date and time of sampling. 6.4 Transporting, handling and care of samples At all stages of sampling, transport

29、and handling, protect the fresh concrete samples against contamination, increase or loss of moisture, excessive vibration, and against extreme variations of temperature. The properties of fresh concrete change with time after mixing, depending upon the environmental conditions. This should be taken

30、into account in deciding when tests are carried out or specimens made. When taking the concrete from the container(s), ensure that no more than a light covering of slurry is left adhering to the container(s). 6.5 Measuring the temperature of the sample When required, measure the temperature of the c

31、oncrete in the container(s) at the time of sampling. 7 Sampling report Each sample shall be accompanied by a report from the person responsible for taking the sample. An example of a test report is given in Annex B. The report shall include a) clear identification of the sample, b) type of sample (c

32、omposite or spot), c) identification of the works, d) identification of the element(s) in the works which the sample represents, e) date and time of sampling, f) identification of the batch sampled, g) ambient temperature and weather conditions, h) name and signature of person responsible for sampli

33、ng, i) temperature of the concrete sample before discharging the concrete (when required), j) any deviations from the standard method of sampling, and k) a declaration by the person technically responsible that the sample was obtained in accordance with this International Standard, except as noted i

34、n j) above. ISO 1920-1:2004(E) 4 ISO 2004 All rights reservedAnnex A (informative) Monitoring sampling error A.1 General This procedure may be used to assess the consistency of the sampling procedure being used by an individual (“repeatability”). Sampling error may be assessed during regular samplin

35、g from the difference in compressive strength between duplicate samples with allowance for the contribution from testing error. A.2 Procedure From each of 20 batches of concrete of the same strength class or mix, a standard sample and a duplicate sample shall be obtained using the procedure describe

36、d in Clause 6. Each increment taken for the standard sample shall be followed immediately by an increment for the duplicate sample and the two samples shall be collected in separate containers. Both the samples shall be prepared in accordance with 6.2 and pairs of test specimens shall be made from e

37、ach composite sample in accordance with ISO 1920-3. All the test specimens shall be tested for compressive strength at 28 days in accordance with ISO 1920-4. A.3 Calculation and reporting sampling error. For each pair of compressive strength results from the 20 standard samples, the mean, M s , and

38、the differences, D s , shall be calculated. Similarly for each pair of compressive strength results from the 20 duplicate samples, the mean, M d , and the differences, D d , shall be calculated. Record each calculation of the mean to the nearest 0,25 MPa. Calculations shall be based on the following

39、 formulae. a) Testing variation, V t22 sd t 80 DD V + = b) Testing plus sampling variance, V ts2 sd ts () 40 MM V = c) Mean strength, M sd 40 M M M + = d) Sampling error (in percent), E sts t s 100 ( 0,5 ) VV E M = ISO 1920-1:2004(E) ISO 2004 All rights reserved 5e) Testing error (in percent), E tt

40、t 100 V E M = Report the sampling error and testing error to the nearest 0,1 %. A.4 Assessment If the estimate of the sampling error is greater than 3 %, then the sampling procedure shall be reviewed. If the estimate of the testing error is above 3 %, then the testing procedure shall be reviewed. If

41、 both estimates are not more than 3 % , the sampling procedure may be assumed to be satisfactory. ISO 1920-1:2004(E) 6 ISO 2004 All rights reservedAnnex B (informative) Example of sampling report Client Test organization Accreditation test report ref. Sampling location Weather conditions: _ Sample S

42、ample number: Date and time of sampling: Type of sample: composite/spot Identification of the works: Identification of the batch sampled (e.g. truckmixer delivery docket): Identification of the element(s) in the works which the sample represents: Ambient temperature _ Temperature of the sample (when

43、 required) Any deviations from this International Standard: Except as detailed above, the sampling was carried out in accordance with ISO 1920-1:2004. _ Technical responsibility Responsible person: Name: Position: Signature: _ Test report identification Test report No.: Date issued: ISO 1920-1:2004(E) ICS 91.100.30 Price based on 6 pages ISO 2004 All rights reserved