ASTM C1385 C1385M-1998(2004)e1 Standard Practice for Sampling Materials for Shotcrete《喷浆混凝土用取样材料的标准实施规程》.pdf

1、Designation: C 1385/C 1385M 98 (Reapproved 2004)e1Standard Practice forSampling Materials for Shotcrete1This standard is issued under the fixed designation C 1385/C 1385M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of

2、 last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEThe title was changed to a dual designation editorially to reflect the existing measurements in the standardin September 2

3、004.1. Scope1.1 This practice covers procedures for obtaining represen-tative samples of materials to be shotcreted. The practicecovers sampling from stationary and truck mixers, volumetricand continuous mixing equipment, and bag and bulk delivery.1.2 The values stated in either inch-pound or SI uni

4、ts are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents; therefore, each system shall be used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with this pr

5、actice.2. Significance and Use2.1 This practice is used to obtain representative samples ofmaterials delivered to the shotcrete machine. These samplesare used to perform tests to determine compliance with thespecifications under which the material is furnished.3. Procedure3.1 Composite samples are r

6、equired by this practice, unlessspecifically made exempt by procedures governing the tests tobe performed, such as tests to determine uniformity of consis-tency and mixer efficiency. Procedures used to select thespecific test batches are not described in this practice, but it isrecommended that rand

7、om sampling be used to determineoverall specification compliance.3.2 The size of an individual sample shall be a minimum of25 lb 12 kg, the size of the composite sample shall be aminimum of 75 lb 35 kg. The composite sample shall be largeenough to perform the required tests.3.3 Sampling shall be per

8、formed as the shotcrete material isdelivered to the shotcrete machine. The procedures used insampling shall include the use of every precaution that willassist in obtaining samples that are truly representative of thenature and condition of the material sampled as follows:3.3.1 Sampling Dry Process

9、Shotcrete MaterialsSamplethe material by collecting two or more portions taken atregularly spaced intervals during discharge of the middle of thebatch or two or more random portions from the discharge ofcontinuous mixers. Combine the portions into one sample fortesting purposes. Do not obtain portio

10、ns of the compositesample from the first 15 % or the last 15 % of the discharge.3.3.2 Sampling Wet Process Shotcrete MaterialSample asdescribed in 3.3.1 within the following limits.3.3.2.1 The elapsed time between obtaining the first and lastportions of the composite sample shall be as short as poss

11、iblebut in no instance shall exceed 15 min.3.3.2.2 Start test for slump or air content, or both, within 5min after obtaining last portion of the composite.3.3.3 Alternative Procedure for Truck and StationaryMixersThe mixer shall be stopped and material portionsremoved by any suitable means at approx

12、imately equal dis-tances from the front and back of the drum. Composite theportions into one sample for testing. Do not obtain portionsfrom the very front and back of the drum. Sample wet processshotcrete material within the time limits described in 3.3.2.1and 3.3.2.2.3.3.4 Sampling Bagged Prepackag

13、ed MaterialRandomlyselect a single package, or more if required to perform thespecified tests, from a lot. A lot is the quantity normally placedon a pallet. In general, this quantity will weigh from 2000 to4000 lbs 900 to 1300 kg.3.3.5 Sampling Bulk Prepackaged MaterialSample thematerial at the poin

14、t of delivery to the shotcrete machine bycollecting three or more portions at regular intervals duringdischarge of the container or transportation unit. Obtain por-tions from the first, middle, and last third of the unit. Do notsample the first 15 % or last 15 % of the discharge. Combineportions for

15、 testing.4. Keywords4.1 dry process; sampling; shotcrete; wet process1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates and is the direct responsibility of Subcommittee C09.46 onShotcrete.Current edition approved June 1, 2004. Published June 2004. Origi

16、nallyapproved in 1998. Last previous edition approved in 1998 as C 1385 98.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any patent rights asserted in connection with

17、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 own responsibility.This standard is subject to revision at any time by the responsible technic

18、al 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 addressed to ASTM International Headquarters. Your comments will receive careful consideration

19、 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, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbo

20、r 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 1385/C 1385M 98 (2004)e12