Section 15075 JOINT GASKETS

Section 15075

JOINT GASKETS

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. This Section specifies rubber gaskets for push-on compression type joints used with fabricated steel pipe, steel pipe, reinforced concrete pipe, concrete cylinder pipe, and cement mortar lined and coated steel pipe.

1.2 QUALITY ASSURANCE

A. References: This Section contains references to the following documents. They are a part of this Section as specified and modified. In case of conflict between the requirements of this Section and those of the listed documents, the requirements of this Section shall prevail.

ASTM D395 Test for Rubber Property -- Compression Set

ASTM D412 Test for Rubber Properties in Tension ASTM D471 Test for Rubber Property -- Effect of Liquids ASTM D573 Test for Rubber - Deterioration in an Air Oven

ASTM D1149 Test for Rubber Deterioration -- Surface Ozone Cracking in a Chamber

(Flat Specimens)

ASTM D2240 Test for Rubber Property -- Durometer Hardness

B. Testing: Certified copies of test reports indicating that the gasket material has been tested and that the results of the tests comply with the requirements specified in Paragraph 15075-

2.2 shall be provided as product data.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Gasket stock shall be a synthetic rubber compound in which the elastomer is neoprene. The compound shall contain no less than 50 percent by volume neoprene and shall be free from factice, reclaimed rubber and other deleterious substances.

2.2 PHYSICAL REQUIREMENTS

A. The compound shall meet the following physical requirements when tested in accordance with the specified ASTM standards.

1. Tensile (ASTM D412): The tensile strength shall be 1,500-psi minimum and the ultimate elongation shall be 350 percent minimum.

2. Hardness (ASTM D2240, Type A Durometer): The compound shall have a hardness in the range of 35 to 50 for concrete spigots and 50 to 65 for steel spigots.

3. Compression Set (ASTM D395): The compression set shall not exceed 20 percent when compressed for 22 hours at 70 degrees C. The test specimens shall be circular discs cut from the gaskets. Test specimens shall be 0.500 (+ 0.005 - 0.025) inches in height. The diameter of the test specimen shall be that of the gasket but not to exceed 1.129 + 0.010 inches in diameter.

4. Aging (ASTM D573): The test specimen deterioration shall be less than 20 percent reduction in tensile strength, 40 percent reduction in ultimate elongation, and 15 points increase in hardness.

5. Effect of Liquids (ASTM D471): The maximum volume change in oil and in water shall be as follows:

a. Oil: 100 percent in ASTM oil No. 3. b. Water: 15 percent.

c. The test specimens shall have a thickness of 0.080 +0.005 inches and shall be circular discs cut from the gasket.

6. Ozone Cracking (ASTM D1149): The test specimen shall be a gasket loop mounted to give at least 20 percent elongation. There shall be no cracking visible at two times magnification of the gasket after 100 hours exposure to 1 mg/l ozone at 40 degrees C.

2.3 PRODUCT DATA

A. In accordance with Section 01300, the Contractor shall provide certified copies of test reports specified in Paragraph 15075-1.2 B.

PART 3 - EXECUTION

A. The gaskets shall be installed in accordance with the manufacturer's recommendations.

END OF SECTION