1、Standard Specification for Expanded and Extruded Foam Board (Polystyrene) AASHTO Designation: M 230-07 (2016)1Release: Group 2 (June 2016) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-4e M 230-1 AASHTO Standard S
2、pecification for Expanded and Extruded Foam Board (Polystyrene) AASHTO Designation: M 230-07 (2016)1Release: Group 2 (June 2016) 1. SCOPE 1.1. This specification covers expanded and extruded polystyrene board used for lightweight fill or highway pavement insulation applications. 2. REFERENCED DOCUME
3、NTS 2.1. ASTM Standards: C177, Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus C272/C272M, Standard Test Method for Water Absorption of Core Materials for Sandwich Constructions C303, Standard Test Method fo
4、r Dimensions and Density of Preformed Block and Board-Type Thermal Insulation C518, Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation D1621, Standard Test Met
5、hod for Compressive Properties of Rigid Cellular Plastics D1622/D1622M, Standard Test Method for Apparent Density of Rigid Cellular Plastics D2863, Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index) 3. GENERAL REQUIREMENTS
6、 3.1. The expanded polystyrene board shall be formed by the expansion of polystyrene base resin in an extrusion process. The board shall be homogeneous and shall consist of a continuum of closed cells. 4. PHYSICAL PROPERTIES 4.1. The board shall conform to the requirements prescribed in Table 1 when
7、 tested by the procedures specified in Section 6. 4.2. Design data should specify both the required compressive strength and thickness. (Normal manufacturing processes and distribution systems allow for 105-kPa, 170-kPa, 275-kPa, 415-kPa, and 690-kPa boards. Boards are manufactured based on need, wi
8、th 275-kPa board normally used as insulation for AASHTOs axle loadings of 98 kN.) 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e M 230-2 AASHTO Table 1Physical Property Requirements Foam Classifi
9、cation Type ASTM C578 Compressive Strengtha(kPa) ASTM D1621 Thermal Resistanceb R-value at 23.9C ASTM C518 or C177 Max Water Absorption (% by Vol) ASTM C272/C272M Oxygen Index (%) ASTM D2863 Minimum Densityc (kg/m3) ASTM C303 or ASTM D1622/D1622M X 105 min 0.88 min 0.3 24 min 21 IV 170 min 0.88 min
10、0.3 24 min 26 VI 275 min 0.88 min 0.3 24 min 29 VII 415 min 0.88 min 0.3 24 min 35 V 690 min 0.88 min 0.3 24 min 48 II 105 min 0.70 min 3.0 24 min 22 aCompressive strength to be determined at 5 percent deflection of specimen thickness or yield, whichever occurs first. A minimum of 275 kPa is require
11、d for AASHTOs normal axle loading of 98 kN. b Units: C m2/W. Tabulated values show required thermal resistance of a 25-mm thickness at a mean temperature of 23.9C. cWhen used for lightweight fill, the maximum density shall not exceed 1.25 minimum density. 5. DIMENSIONAL TOLERANCES 5.1. Normally, ext
12、ruded polystyrene foam boards shall be either 610 by 2440 mm or 1220 by 2440 mm, with the thickness being specified by the user. 5.2. The permissible variations from the ordered dimensions shall be as follows (ASTM C578): 5.2.1. Length 0.8 mm per 305 mm of length, 5.2.2. Width 1.6 mm per 305 mm of w
13、idth, 5.2.3. Thickness 1.6 mm per 25 mm of thickness (Note 1). Note 1When used for insulation, the thickness of board used shall be based on heat flow theory and local conditions. 6. METHODS OF TESTING 6.1. The physical properties enumerated in this specification shall be determined in accordance wi
14、th the following methods of the American Society for Testing and Materials (ASTM): 6.1.1. Compressive StrengthASTM D1621, Procedure A, except that the compressive strength shall be determined when the specimen is compressed 5 percent of measured thickness or at the first major load deviation, whiche
15、ver comes first. A major load deviation shall be that point on the stressstrain curve where the stress load drops significantly below the normal stress fluctuation characteristic of the material under test (Note 2). Note 2Construction requirements should specify a smooth surface on which the board i
16、s to be placed to prevent point loadings; wooden skewers or piles of non-frost-susceptible sand or gravel used to hold the boards from “separating” or “shoving” during covering; and a minimum of 250 mm of granular material above the insulation for “stress absorption” or prevention of crushing of the
17、 insulation by construction traffic. An on-site test with the proposed methods of construction, including layer thickness and construction equipment, is recommended to ensure that there is no separation of the boards nor crushing of the insulation. The potential for differential icing should be take
18、n into consideration when selecting the depth of cover over the extruded foam board. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e M 230-3 AASHTO 6.1.2. Oxygen IndexASTM D2863. This test shall b
19、e used to establish the minimum oxygen index. 6.1.3. Water AbsorptionASTM C272/C272M. 6.1.4. Thermal ResistanceTest in accordance with ASTM C177 or ASTM C518. Tests shall be conducted with a temperature differential of 28 1C. 6.1.5. DensityTest in accordance with ASTM C303 or ASTM D1622/D1622M. 7. H
20、AZARDS 7.1. Health and SafetyEach manufacturer has a duty to warn when the shipment, storage, installation, use, or ultimate disposal of a product may expose individuals to health or safety hazards. The manufacturer shall provide the user with appropriate information regarding any known hazards asso
21、ciated with the recommended handling and use of the product, and shall recommend the protective measures to be employed in its safe utilization. 8. KEYWORDS 8.1. Foam; polystyrene. 1Reapproved with no technical changes; minor editorial revisions have been made at the discretion of the authors responsible for standards on joint materials, wood, bridge bearings, geosynthetics, and insulation board (technical section 4e). 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
