AASHTO T 347-2013 Standard Method of Test for Slump Flow of Self-Consolidating Concrete (SCC).pdf

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1、Standard Method of Test for Slump Flow of Self-Consolidating Concrete (SCC) AASHTO Designation: T 347-131American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-3b T 347-1 AASHTO Standard Method of Test for Slump Flow of S

2、elf-Consolidating Concrete (SCC) AASHTO Designation: T 347-1311. SCOPE 1.1. This test method covers determination of slump flow of self-consolidating concrete (SCC), both in the laboratory and in the field. SCC is defined as a highly workable concrete that can flow through densely reinforced or comp

3、lex structural elements under its own weight without vibration and adequately fill voids without experiencing segregation or excessive bleeding. 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

4、 brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard. 1.3. This standard does not purport to address all of the safety concerns ass

5、ociated 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 regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: R 60, Sampling Freshly Mixed Concrete T 119M/T 119,

6、Slump of Hydraulic Cement Concrete 3. SUMMARY OF TEST METHOD 3.1. A sample of freshly mixed SCC is placed in an inverted mold shaped as the frustum of a cone. The mold is raised, allowing the SCC to spread radially. After flow has ceased, the diameter of the SCC is measured in two perpendicular dire

7、ctions. The average of the two measured diameters is the slump flow. 4. SIGNIFICANCE AND USE 4.1. This test method is applicable to SCC, defined in Section 1.1. 4.2. This test method is intended to provide the user with a procedure to assess the horizontal free flow of SCC in the absence of obstruct

8、ions. The test gives an assessment of filling ability and may give some indication of resistance to segregation, but it gives no indication of the ability of the SCC to pass between reinforcement without blocking. 4.3. This test method is applicable to SCC having coarse aggregate up to 25 mm 1 in. I

9、f the coarse aggregate is larger than 25 mm 1 in., the test method is applicable when it is performed on the 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3b T 347-2 AASHTO fraction of concrete pass

10、ing a 25-mm 1-in. sieve, with the larger aggregate being removed in accordance with Section 6 of R 60. 5. APPARATUS 5.1. MoldThe SCC shall be placed in an inverted slump cone mold conforming to the applicable requirements of T 119M/T 119. 5.2. Base PlateThe base plate shall be made of a stiff, nonab

11、sorbing material, at least 820 mm 32 in. square and marked with both a circle indicating the central location for the slump cone and a concentric circle with a diameter of 500 mm 20 in. 5.3. Scoop. 5.4. Strike-off bar. 5.5. Tape measure containing increments of 6 mm 0.25 in. or less. 5.6. Stopwatch.

12、 6. SAMPLING 6.1. Approximately 6 L 0.2 ft3 of SCC is needed to perform the slump flow test, sampled normally. 6.2. The sample of concrete shall be obtained in accordance with R 60. 7. PROCEDURE 7.1. Moisten the base plate and the inside of the slump cone. 7.2. Place the base plate on a level, stabl

13、e surface and the inverted slump cone centrally on the base plate, and hold down firmly (Figure 1). Figure 1Mold and Base Plate for Slump Flow Test Minimum 820 mm 32 in.Base PlateInverted Slump Cone 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. D

14、uplication is a violation of applicable law.TS-3b T 347-3 AASHTO 7.3. From the sample of concrete obtained in accordance with Section 6, fill the entire mold continuously. The mold shall be held firmly in place during filling. 7.4. Do not rod or tamp the SCC. Do not tap or vibrate the cone. 7.5. Use

15、 the strike-off bar to strike off the SCC level with the top of the cone. 7.6. Remove any spilled or struck-off SCC from around the base of the cone to preclude interference with the flowing SCC. 7.7. Raise the cone vertically 230 mm 75 mm 9 in. 3 in. above the base plate with no lateral or torsiona

16、l motion within a time period of 3 s 1 s, and allow the SCC to flow out freely from within. Complete procedures in Sections 7.3 through 7.7 within 21/2min. 7.8. Simultaneously with the lifting of the cone, start the stopwatch. Record the time required for the first contact of the SCC slump flow patt

17、y with the 500-mm 20-in. ring on the base plate. This is the T-50 time. 7.9. After the concrete flow has stopped, measure the final diameter of the SCC in two perpendicular directions to the nearest 6 mm 0.25 in. (Note 1). The average of the two measured diameters is the slump flow in millimeters (i

18、nches). Any halo shall be included in the slump flow diameter. Note 1Measure the largest diameter of the slump flow as one diameter and the perpendicular diameter as the second to ensure consistency between tests. If the two values differ in diameter by more than 51 mm 2 in., the test is considered

19、invalid and must be repeated because it is likely that the cone was raised with lateral motion. 8. REPORT 8.1. Record the final diameter of the SCC in two perpendicular directions. The average of the two measured diameters is the slump flow in millimeters (inches) to the nearest 5 mm 0.25 in. 8.2. R

20、ecord the T-50 time, the time required for the slump flow patty to reach the 500-mm 20-in. ring on the base plate. 9. PRECISION AND BIAS 9.1. No precision and bias statements are available at this time. 10. KEYWORDS 10.1. Cone; flowability; plasticity; SCC; self-consolidating concrete; slump; workability. 1Formerly AASHTO Provisional Standard TP 73. First published as a full standard in 2013. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.