ASTM C1791-16 (R2021) pdf free download.Standard Guide for Reduction of Efflorescence Potential in New Unit Pavement Systems.
1 .1 This guide covers methods for reducing etTlorescence potential in new unit pavement systems.
1 .2 The values stated in inch-pound units are to he regarded as the standard. The SI units given in parentheses are for information only.
3.2.2 efflorescence, n—a crystalline deposit. usually white, of water-soluble compounds on the surface of a unit pavement system.
3.2.2. 1 Discussion—While not considered to he efflorescence, stains produced by acid-soluble vanadium compounds in clay masonry are usually yellow or green: and stains produced by acid-soluble manganese compounds are usually brown or gray.
3.2.3 jointing material, n—mortar. aggregate. sealant. or other materials used between paver units.
3.2.4 unit pavement system, n—a system consisting of edge restraint, wearing course of discrete clay or concrete payers, setting bed, jointing material, base or sub-base, or combination thereof, and appropriate drainage elements.
3.2.4.1 Discussion—Flexible pavement is a unit pavement system whose wearing course Consists of discrete clay or concrete payers on an aggregate base, an aggregate base stabilized with asphalt or cement, or asphalt pavement.
3.2.4.2 Discussion—Rigid pavement is a unit pavement system whose surface wearing course consists of discrete clay or concrete units on a rigid base such as concrete.
4. Significance and Use
4.1 This guide provides information that, if implemented, will reduce effiorescence potential in new unit pavement systems. However, its implementation will not always completely prevent eftiorescence.
4.2 This guide may be augmented by related information contained in the appendixes of Specification C270, the additional material listed in Appendix X1 in this standard, and other publications.
5. Principles of Efflorescence
5.1 Efflorescence is directly related to the quantity of water-soluble compounds within, or exposed to, a unit pavement system: and to the quantity of water exposed to these compounds. Water-soluble compounds or water causing ciflorescence may be from adjacent surfaces or beneath the pavement system: for example, fertilizer in runoff from adjacent flower beds or lawns: ground water evaporating through the wearing course.ASTM C1791 pdf download.