Joint FIll on Segmental Pavement (continued from page 18) concrete units (pavers or slabs) with an open, poorly graded joint fill is a SWM (Storm Water Management) asset. The joint fill should be ASTM #8 or #9 stone depending on spacing. ASTM #8 (⅜" to ¼") clean stone ideal for joint spaces from ½" to 1"+. ASTM #9 stone (⅛" to 3/16") clean stone works for ¼"to ½" tighter jointed SPP systems. Both have 90% fractured face, are less than 5% passing the 200 sieve, are hardness tested, with a narrow, poorly graded range of particles. A solution these aggregates offer in SPP is the almost infinite receptor points each stone possesses for filtration of contaminates. Contaminates like TSS (Total Suspended Solids), organics, petroleum distilates, heavy metals like brake dust, etc…. attach to the receptor points and can be agitated and removed to increase infiltration if ponding water is observed. Open graded joint fill also generates microbes (bacterium) that will consume these harmful contaminates. Clean stone for SPP jointing can be a great color and texture enhancement to the paving product. “AquaRock” is a bagged ASTM #9 for permeable pavements. This joint material has a shape, hardness, and gradation that industry professionals specify with a look that compliments the pavements
aesthetics.” George Beiter VP Sales Flexlock/ Alliance These ASTM #8 and #9 course angular particles remain securely in the joint especially when subject to microscopic airborne particles even on steep slopes, snow plowed areas, pool decks, etc… but a joint stabilizing protectant can assist. In addition to joint stabilization these protectants benefit deicing salt resistance, ease of long term care, and breathability, representing a tremendous value with very little reduction in infiltration. ICP, CPS, PS and SPP have helped define the historic and modern hardscape industry. Their success can be attributed to some manufacturers uncompromising commitment to quality and service. System standards have also added to their viability. These standards are ‘horizon by horizon’ in writing specifications for type, application and life cycle of the pavement. The final horizon for these systems is joint fill. Joint fill as we’ve seen isn’t just a sweep, wet, and run process. The focus on this final detail of segmental pavement can be the difference between success and failure and you’re too far along for the latter. Joints filled, consolidated, and stabilized gives these lifetime pavements lifetime enjoyment.
About the Author
Pete is currently the N.A. Director of Education and Information and U.S. Sales Director with Techo-Bloc Corporation. He is a certified instructor for both the National Concrete Masonry Association (Segmental Retaining Wall – SRW installation) and the Interlocking Concrete Pavement Institute. Additionally, he has served as a committee member for “Education and Training” and “Construction” for these industry organizations.
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