ASTM F3706 : 24

1.1 This practice covers the procedures to structurally or non-structurally reconstruct, seal, and protect existing large diameter conduits with spray application mortar linings in the field. Applications include applying prepackaged cementitious or geopolymer liner materials that may function as a fully structural, partially structural, or protective conduit repair or restoration. A fully structural lining shall be designed to support all imposed loads independent of the host pipe or conduit structure. A uniform high-strength, fiber-reinforced cementitious or geopolymer mortar shall be manually sprayed or centrifugally cast in a uniform, prescribed thickness to all cleaned, interior surfaces of the host pipe or conduit. The cementitious or geopolymer liner may be applied to host pipes constructed of brick, concrete, block, and steel, and can be used in a variety of gravity or low-pressure applications such as sanitary sewers, storm sewers, low pressure force mains, and process piping. Application of lining may be applied by centrifugal casting, hand sprayed or hand trowelled.

1.2 A manufacturer’s approved applicator shall furnish the complete application of the reconstruction process using prepackaged cementitious or geopolymer liner material. All cleaning, preparation, and application procedures shall be in accordance with the manufacturer’s recommendations.

1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.