AASHTO PP 58-12 (2015)

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Standard Practice for

Static Segregation of Hardened

Self-Consolidating Concrete

(SCC) Cylinders

AASHTO Designation: PP 58-12 (2015)1

American Association of State Highway and Transportation Officials

444 North Capitol Street N.W., Suite 249

Washington, D.C. 20001

TS-3c PP 58-1 AASHTO

Standard Practice for

Static Segregation of Hardened

Self-Consolidating Concrete

(SCC) Cylinders

AASHTO Designation: PP 58-12 (2015)1

1. SCOPE

1.1. This method covers procedures for determining the static segregation resistance (stability) of self-

consolidating concrete (SCC) using hardened 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 explanatory 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, 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 regulatory limitations prior to use.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:

 M 205M/M 205, Molds for Forming Concrete Test Cylinders 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 using 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 testing for specified static segregation limits;

TS-3c PP 58-2 AASHTO

3.2.2. Checking the adequacy of mixture proportions to resist static segregation; and

3.2.3. Quality control.

4. APPARATUS

4.1. Molds, Cylinder—150-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 Tools—Handheld wood or metal float or trowel.

4.3. Saw—The saw shall have a diamond or silicon-carbide cutting edge and shall be capable of

cutting specimens without excessive heating or shock.

4.4. Core Drill—The core drill shall conform to the requirements of T 24M/T 24.

4.5. A suitable container for filling specimen molds with SCC.

Note 1—Experience has shown pails and plastic cylinder molds to be suitable 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 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 segregation 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 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 be level to within 20 mm/m

(0.25 in./ft).

6.1.2. Specimen molds shall be filled in one lift, poured using a suitable container without vibration,

rodding, or tapping.

6.1.3. Strike off the surface of the concrete level with the top of the mold using a float or trowel.

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摘要：

本规范文档标题为“AASHTO PP 58-12 (2015)”，即美国国家公路与运输协会标准《混凝土强度成熟度评估标准实践》（2012年发布，2015年确认）。该标准详细规定了通过成熟度方法预测混凝土早期强度、评估养护效果及控制施工进度的技术流程与计算模型。适用于桥梁、道路、隧道及大体积混凝土结构等工程场景，帮助工程师减少破坏性试验频率，提升施工效率与安全控制。文档明确了温度传感器布设、成熟度指数计算及强度-成熟度关系曲线建立等操作要求，是混凝土质量控制与工期优化的权威技术参考。

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