AASHTO T 119M T 119-2018 Standard Method of Test for Slump of Hydraulic Cement Concrete.pdf

1、Standard Method of Test for Slump of Hydraulic Cement Concrete AASHTO Designation: T 119M/T 119-18 Technical Section: 3b, Fresh Concrete Release: Group 1 (April) ASTM Designation: C143/C143M-15a American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 2

2、49 Washington, D.C. 20001 TS-3b T 119M/T 119-1 AASHTO Standard Method of Test for Slump of Hydraulic Cement Concrete AASHTO Designation: T 119M/T 119-18 Technical Section: 3b, Fresh Concrete Release: Group 1 (April) ASTM Designation: C143/C143M-15a 1. SCOPE 1.1. This test method covers determination

3、 of slump of concrete, both in the laboratory and in the field. 1.2. The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore,

4、 each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3. The text of the standard reference notes and footnotes provide explanatory material. These notes and footnotes (excluding those in tables and figures) sha

5、ll not be considered as requirements of the standard. 1.4. This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regul

6、atory limitations prior to use. WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: R 60, Sampling Freshly Mixed Concrete T 23, Making and Curing Concrete Test Specimens in th

7、e Field T 121M/T 121, Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete T 152, Air Content of Freshly Mixed Concrete by the Pressure Method T 196M/T 196, Air Content of Freshly Mixed Concrete by the Volumetric Method 2.2. ASTM Standards: C150/C150M, Standard Specification for P

8、ortland Cement C670, Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b T 119M/T 119-2 AASHTO

9、 3. SUMMARY OF TEST METHOD 3.1. A sample of freshly mixed concrete is placed and compacted by rodding in a mold shaped as the frustum of a cone. The mold is raised and the concrete allowed to subside. The vertical distance between the original and the displaced position of the center of the top surf

10、ace of the concrete is measured and reported as the slump of the concrete. 4. SIGNIFICANCE AND USE 4.1. This test method is intended to provide the user with a procedure to determine the slump of plastic hydraulic cement concretes. Note 1This test method was originally developed to provide a techniq

11、ue to monitor the consistency of unhardened concrete. Under laboratory conditions, with strict control of all concrete materials, the slump is generally found to increase proportionally with the water content of a given concrete mixture and thus to be inversely related to concrete strength. Under fi

12、eld conditions, however, such a strength relationship is not clearly and consistently shown. Care should therefore be taken in relating slump results obtained under field conditions to strength. 4.2. This test method is considered applicable to plastic concrete having coarse aggregate passing the 37

13、.5-mm 1.5-in. sieve. If the plastic concrete includes coarse aggregate particles sized larger than 37.5 mm 1.5 in., the larger aggregate particles are to be removed according to Section 6 of R 60 before testing. 4.3. This test method is not considered applicable to nonplastic and noncohesive concret

14、e. Note 2Concretes having slumps less than 15 mm 0.5 in. may not be adequately plastic and concretes having slumps greater than about 230 mm 9 in. may not be adequately cohesive for this test to have significance. Caution should be exercised in interpreting such results. 5. APPARATUS 5.1. MoldThe te

15、st specimen shall be formed in a mold made of metal not readily attacked by the cement paste. The metal shall not be thinner than 1.5 mm 0.060 in. and, if formed by the spinning process, there shall be no point on the mold at which the thickness is less than 1.15 mm 0.045 in. The mold shall be in th

16、e form of the lateral surface of the frustum of a cone with the base 203 mm 8 in. in diameter, the top 102 mm 4 in. in diameter, and the height 305 mm 12 in. Individual diameters and heights shall be within 3.2 mm0.125 in. of the prescribed dimensions. The base and the top shall be open and parallel

17、 to each other and at right angles to the axis of the cone. The mold shall be provided with foot pieces and handles similar to those shown in Figure 1. The mold shall be constructed without a seam. The interior of the mold shall be relatively smooth and free from projections. A mold that clamps to a

18、 nonabsorbent base plate is acceptable instead of the one illustrated, provided the clamping arrangement is such that it can be fully released without movement of the mold and the base is large enough to contain all of the slumped concrete in an acceptable test. 5.1.1. Check and record conformance t

19、o the molds specified dimensions when it is purchased or first placed in service and at least annually thereafter. 5.1.2. Mold with Alternative Materials: 5.1.2.1. Molds other than metal are permitted if the following requirements are met: The mold shall meet the shape, height, and internal dimensio

20、nal requirements of Section 5.1. The mold shall be sufficiently rigid to maintain the specified dimensions and tolerances during use, resistant to impact forces, and shall be nonabsorbent. The mold shall be demonstrated to provide test results 2018 by the American Association of State Highway and Tr

21、ansportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b T 119M/T 119-3 AASHTO comparable to those obtained when using a metal mold meeting the requirements of Section 5.1. Comparability shall be demonstrated on behalf of the manufacturer by an independent test

22、ing laboratory. Test for comparability shall consist of not less than 10 consecutive pairs of comparisons performed at each of three different slumps ranging from 50 to 200 mm 2 to 8 in. No individual test results shall vary by more than 15 mm 0.50 in. from that obtained using the metal mold. The av

23、erage test results of each slump range obtained using the mold constructed of alternative material shall not vary by more than 6 mm 0.25 in. from the average of test results obtained using the metal mold. Manufacturer comparability test data shall be available to users and laboratory inspection auth

24、orities (see Note 4). If any changes in material or method of manufacture are made, tests for comparability shall be repeated. Note 3The phrase “consecutive pairs of comparisons” does not mean without interruption or all in 1 day. At a schedule selected by the testing entity, the pairs of tests lead

25、ing to 10 consecutive pairs may be accomplished in small groups. The word consecutive prevents ignoring pairs of tests that may not meet criteria. Note 4Because the slump of concrete decreases with time and higher temperatures, it will be advantageous for the comparability tests to be performed by a

26、lternating the use of metal cones and alternative material cones, to utilize several technicians, and to minimize the time between test procedures. 5.1.2.2. If the condition of any individual mold is suspected of being out of tolerance from the as manufactured condition, a single comparative test sh

27、all be performed. If the test results differ by more than 15 mm 0.50 in. from that obtained using the metal mold, the mold shall be removed from service. 5.2. Tamping RodA round, straight, steel rod, with a 16 2-mm 58 116-in. diameter. The length of the tamping rod shall be at least 100 mm 4 in. gre

28、ater than the depth of the measure in which rodding is being performed but not greater than 600 mm 24 in. in overall length (see Note 5). The length tolerance for the tamping rod shall be 4 mm 18in. The rod shall have the tamping end or both ends rounded to a hemispherical tip of the same diameter a

29、s the rod. Note 5A rod length of 400 mm 16 in. to 600 mm 24 in. meets the requirements of the following AASHTO Test Methods: T 23, T 119M/T 119, T 121M/T 121, T 152, and T 196M/T 196. 5.3. Measuring DeviceA ruler, metal roll-up measuring tape, or similar rigid or semirigid length measuring instrumen

30、t marked in increments of 5 mm 0.25 in. or smaller. The instrument length shall be at least 300 mm 12 in. 5.4. ScoopA scoop of a size large enough so each amount of concrete obtained from the sampling receptacle is representative and small enough so it is not spilled during placement in the mold. 20

31、18 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b T 119M/T 119-4 AASHTO Dimensional Units mm 2 3 15 25 75 80 100 200 300 in. 0.0625 0.125 0.5 1 3 3.128 4 8 12 Figure 1Mold for Slump Test 6. SAMPLE 6.1

32、. Obtain a representative sample of cement concrete according to R 60. If the plastic concrete includes coarse aggregate particle sized larger than 37.5 mm 1.5 in., remove the larger sized aggregate particles according to Section 6 of R 60. Note 6Slump testing shall begin within 5 min of obtaining t

33、he sample . 7. PROCEDURE 7.1. Dampen the inside of the mold and place it on a dampened, rigid, nonabsorbent surface that is level and firm. HandleFoot Piece53.12534 0.125 ID40.50.0625Thickness12 0.1250.50.58 0.125 IDPlan0.0625Thickness 2018 by the American Association of State Highway and Transporta

34、tion Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b T 119M/T 119-5 AASHTO 7.2. Hold the mold firmly in place during filling and perimeter cleaning by standing on the two foot pieces or by clamping the foot pieces to a base plate. 7.3. Use the scoop to fill the mol

35、d one-third full by volume, to a depth of approximately 70 mm 2.75 in. 7.4. Consolidate the layer with 25 strokes of the tamping rod, using the rounded end. Distribute the strokes evenly over the entire cross section of the concrete. For the bottom layer, incline the rod slightly and make approximat

36、ely half the strokes near the perimeter, then progress with vertical strokes, spiraling toward the center. 7.5. Use the scoop to fill the mold two-thirds full by volume, to a depth of approximately 160 mm 6.5 in. Consolidate this layer with 25 strokes of the tamping rod; penetrate approximately 25 m

37、m 1.0 in. into the bottom layer. Distribute the strokes evenly. 7.6. Use the scoop to fill the mold to overflowing. Consolidate this layer with 25 strokes of the tamping rod; penetrate approximately 25 mm 1.0 in. into the second layer. Distribute the strokes evenly. If the concrete falls below the t

38、op of the mold, stop, add more concrete, and continue rodding for a total of 25 strokes. Keep an excess of concrete above the top of the mold at all times. Distribute strokes evenly as before. 7.7. Strike off the top surface of concrete with a screeding and rolling motion of the tamping rod. 7.8. Cl

39、ean overflow concrete away from the base of the mold. 7.9. Carefully raise the mold vertically 300 mm 12 in. in 5 2 s by a steady upward lift with no lateral or torsional (twisting) motion imparted to the concrete. 7.10. Complete the entire operation, from the start of the filling through removal of

40、 the mold, within 21/2min. 7.11. Immediately measure the slump. 7.11.1. Invert the slump mold and set it next to the specimen. 7.11.2. Lay the tamping rod across the mold so that it is over the test specimen. 7.11.3. Measure the distance between the bottom of the rod and the displaced original cente

41、r of the top of the specimen to the nearest 5 mm 0.25 in. 7.12. Do not reuse the tested specimen. Note 7It is recommended not to reuse the tested concrete slump specimen for project-related materials. However, for lab testing, the specimen may be reused if thoroughly remixed with remaining represent

42、ative sample. Note 8If a decided falling away or shearing off of concrete from one side or a portion of the mass occurs, disregard the test and make a new test on another portion of the sample. If two consecutive tests on a sample of concrete show a falling away or shearing off of a portion of the c

43、oncrete from the mass of the specimen, the concrete probably lacks the plasticity and cohesiveness necessary for the slump test to be applicable. 8. REPORT 8.1. Record the slump to the nearest 5 mm 0.25 in. 2018 by the American Association of State Highway and Transportation Officials. All rights re

44、served. Duplication is a violation of applicable law.TS-3b T 119M/T 119-6 AASHTO 9. PRECISION AND BIAS 9.1. PrecisionThe estimates of precision for this test method are based on results from tests conducted in Fayetteville, Arkansas, by 15 technicians from 14 laboratories representing three states.

45、All tests at three different slump ranges, from 25 mm 1.0 in. to 160 mm 6.5 in., were performed using one load of truck-mixed concrete. The concrete was delivered and tested at a low slump, with water then being added and mixed into the remaining concrete to independently produce moderate and finall

46、y high-slump concrete. The concrete mixture that used a No. 67 crushed limestone aggregate and a washed river sand contained 297 kg of cementitious material per cubic meter 500 lb of cementitious materials per cubic yard. The 297 kg of cementitious material 500 lb were equally divided between an AST

47、M C150/C150M, Type I/II cement and a Class C fly ash. A double dosage of a chemical retarder was used in an attempt to minimize slump losses and maintain workability of the concrete. Concrete temperatures ranged from 30 to 34C 86 to 93F. Slump losses averaged 17 mm 0.68 in. during the 20 min require

48、d to perform a series of six tests at one slump range. Testing was performed alternately using metal and plastic molds, which were determined to produce comparable results. Precision data thus applies to both metal and plastic molds. A total of 270 slump tests were performed. 9.1.1. SI Inch-PoundThe

49、 data used to develop the precision statement were obtained using metric units (millimeters). The precision values shown in inch-pound units are conversions from the millimeter measurements, which were recorded to the nearest 1 mm. 9.1.2. Measure of VariabilityThe standard deviation was determined to be the most consistent measure of variability and was found to vary with the slump value. 9.1.3. Single-Operator PrecisionT