. Construction materials for coastal structures. Coastal engineering; Building materials. For reinforcing, asphalt mastics are used as grouts to fill and plug the voids in stone structures such as jetties and revetments (Figs. 44 and 45). The binding action of the mastic tends to make one firm mass, yet mastics are flexible enough to conform to some differential settlement in the structure. Asphalt mastics are also used as joint fillers to bind stone blocks together on coastal structures, particularly in European construc- tion. m (8 ft) ASPHALT CONCRETE CAP. ASPHALT SEAL (GROUTING) COURSE
. Construction materials for coastal structures. Coastal engineering; Building materials. For reinforcing, asphalt mastics are used as grouts to fill and plug the voids in stone structures such as jetties and revetments (Figs. 44 and 45). The binding action of the mastic tends to make one firm mass, yet mastics are flexible enough to conform to some differential settlement in the structure. Asphalt mastics are also used as joint fillers to bind stone blocks together on coastal structures, particularly in European construc- tion. m (8 ft) ASPHALT CONCRETE CAP. ASPHALT SEAL (GROUTING) COURSE COVER STONE to (6 TO 10 TONS) CORE STONE 34 kg to (75 LB. TO 2 TONS) m (3 ft) RIPRAP 7 to 91 kg (15 to 200 LB.) Figure 44. Cross section, south jetty, Galveston, Texas. (5) Surface Treatments. (a) Purposes. A surface treatment may be applied to an asphalt surface for a number of reasons. It may be designed to make the surface more watertight, or to protect it from abrasion by waves, water currents, or even by ice. A layer of mud deposited on an asphalt surface or algae and other sediments, and allowed to dry, will shrink as they dry will set up suprisingly large tensile stresses at the surface resulting in the surface curling or cracking. A surface treatment may also be used to protect the surface from mud curl or the curling of drying algae along the waterline, to give the surface a lighter color in order to reduce tempera- ture extremes, or to reduce the rate of oxidation of the exposed asphalt surface. (b) Sprayed Asphalt Seals. Asphalt cement or emulsified asphalt sprayed over the surface of an asphalt lining at the rate of 1 liter per square meter ( gallon per square yard} will provide a film coating as much as 1 millimeter ( inch) thick. A continuous film coating will fill and seal any exposed pores and increase the watertightness of the asphalt lining. It will also tend to fill and seal small cracks in the surface that may have been caused by i
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