AASHTO PP 58-2012 Standard Practice for Static Segregation of Hardened Self-Consolidating Concrete (SCC) Cylinders.pdf
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1、TS-3c PP 58-1 AASHTO Standard Practice for Static Segregation of Hardened Self-Consolidating Concrete (SCC) Cylinders AASHTO Designation: PP 58-12 1. SCOPE 1.1. This method covers procedures for determining the static segregation resistance (stability) of self-consolidating concrete (SCC) using hard
2、ened test specimens. 1.2. The concrete used to make the molded specimens shall be sampled after all on-site adjustments have been made to the mixture proportions, including the addition of mix water and admixtures. 1.3. The text of this standard references notes and footnotes that provide explanator
3、y information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements for this standard. 1.4. The values stated in SI units are to be regarded as the standard. 1.5. This standard does not purport to address all of the safety concerns, if any, associ
4、ated 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: M 205M/M 205, Molds for Forming Concrete Test Cylinders
5、 Vertically R 60, Sampling Freshly Mixed Concrete T 22, Compressive Strength of Cylindrical Concrete Specimens T 24M/T 24, Obtaining and Testing Drilled Cores and Sawed Beams of Concrete 3. SIGNIFICANCE AND USE 3.1. This method provides a visual assessment of static segregation resistance of SCC usi
6、ng a Hardened Visual Stability Index (HVSI) to evaluate molded or cored hardened concrete cylinders cut lengthwise in two. 3.2. If the specimens are made and cured as specified herein, the resulting static segregation test data are able to be used for the following purposes: 3.2.1. Acceptance testin
7、g for specified static segregation limits; 3.2.2. Checking the adequacy of mixture proportions to resist static segregation; and 2013 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3c PP 58-2 AASHTO 3.2.3
8、. Quality control. 4. APPARATUS 4.1. Molds, Cylinder150- by 300-mm (6- by 12-in.) cylinder molds for casting concrete test specimens shall conform to the requirements of M 205M/M 205. 4.2. Small ToolsHandheld wood or metal float or trowel. 4.3. SawThe saw shall have a diamond or silicon-carbide cutt
9、ing edge and shall be capable of cutting specimens without excessive heating or shock. 4.4. Core DrillThe core drill shall conform to the requirements of T 24M/T 24. 4.5. A suitable container for filling specimen molds with SCC. Note 1Experience has shown pails and plastic cylinder molds to be suita
10、ble containers. 5. SAMPLING CONCRETE 5.1. Samples of freshly mixed SCC used to fabricate test specimens under this standard shall be obtained in accordance with R 60. 5.2. Cored test specimens taken from hardened self-consolidating concrete under this standard shall be obtained in accordance with T
11、24M/T 24, except for the following: 5.2.1. Cored test specimens may be taken so that the axis is perpendicular or parallel to the concrete as it was originally placed, and 5.2.2. Cored test specimens shall have a minimum diameter of 50 mm (2 in.) and sufficient length to assess extent of static segr
12、egation resistance. 5.3. Record the identification of the test specimens with respect to the location of the concrete represented and the time of casting. 6. MOLDING AND CURING SPECIMENS OF FRESHLY MIXED SCC 6.1. Making Specimens: 6.1.1. A minimum of two fresh test specimens shall be molded as near
13、as practicable to the place where they are to be stored. If it is not practicable to mold the specimens where they will be stored, move them to the place of storage immediately after strike off. Place molds on a rigid surface free from vibration and other disturbances. The supporting surface shall b
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