ASTM C1791:16(R2021) pdf free download – Standard Guide for Reduction of Efflorescence Potential in New Unit Pavement Systems.
6.2.3 Construction practices thai protect uncompleted unit pavement systems from ruin or snow during construction.
6.2.4 Properly sited and located movement joints in the pavement and in rigid bases such as concrete.
6.2.5 Gutters, overhangs, and canopies to protect the pavement from rain.
6.2.6 For concrete paving units, utilization of integral efilorescence controlling compounds in the units or compatible applied water repellent scaler on thc surface of unit pavement. or both.
6.2.7 Utilization of compatible integral water repellent admixtures and mortar modifiers.
6.3 Water that penetrates a unit pavement system is quickly drained out of the system by:
6.3.1 The use of a drainage system that conveys water to low points and allows Water to be conveyed out of the pavement system.
6.3.2 Drainage holes through the slab base at the low points in systems that are installed over slab bases to drain water off the slab base.
6.4 Contact between dissimilar paver units is minimized by:
6.4.1 The use of a separator between changes in paver materials in unit pavement systems.
6.5 Potential efflorescence compounds in the pavement system materials can be minimized by:
6.5.1 Preconstruction testing of all unit pavement system materials, water, cleaning agents. deicing chemicals, and admixtures to be used to evaluate their potential to contribute to emorescence. The results of these tests should be evaluated together with the influence of construction practices and design in predicting etliorescence potential in pavements. Available preconstruction tests include: Test Method C67/C67M emo. rescence test for brick: chemical analysis of cements to deiermine water soluble alkali (NaO KO) content: chemical analysis of hydrated lime to determine calcium sulfate content; and chemical analysis of sand, water. admixtures and cleaning agents to determine alkali, chloride, and sulfate content. Presently. there is no ASTM elIlorcscence test for concrete paver units or mortar. The potential for efflorescence increases with increasing amounts of water-soluble alkali, chlorides, and sulfates in segmental and masonry pavement materials.
6.5.2 Storage and protection of all unit pavement system materials prior to use to prevent contact with dissimilar materials and to protect materials from moisture.
6.5.3 Protection of all unit pavement system materials during transportation when there is a probability of contamination from road salts, fertilizers, and airborne contaminants.
6.5.4 Utilization of proper cleaning materials and procedures on new unit pavement systems.
6.5.5 Not using crushed recycled concrete in pavement bases where drainage is pxr or high ground water conditions exist.
6.6 Exposure of unit pavement systems to potential efflorescence causing compounds is minimized by:
6.6.1 Minimizing the use of deicing chemicals.