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sleeves shall be constructed of the same fabric used in the individual layers of <br /> fabric . A 6 -in by 12-in test cylinder shall be cut from each specimen and tested in <br /> accordance with ASTM C39 , <br /> B . The average compressive strength of the test cylinder shall be at least 20p ercent <br /> higher at seven days than that of companion test cylinders made in accordance with <br /> ASTM C31 , and not less than 2000 psi at 28 days . <br /> C . Fabric forming material shall consist of specifically woven , double layer, open selvage <br /> fabric jointed in mat configuration . The fabric shall consist of uncoated synthetic yarns <br /> with sufficient tensile strength and porosity to withstand the pressure of the grout <br /> injection pump without breaking the layers of fabric . <br /> D . The two fabric layers shall each be no lighter than 18 by 18 count per inch , 1000 denier <br /> nylon of 1000 denier polyester tire cord , of which at least 50 percent by weight shall be <br /> producer-bulked continuous multi-filament tire cord nylon . Fabric of equal or greater <br /> strength and porosity may be used with approval of the Engineer. Fabric containing film <br /> type polypropylene fiber will not be considered as an acceptable alternate . <br /> E . Individuals mill width panels shall be cut to suitable length and the two layers of fabric <br /> separately joined edge to edge by means of nylon thread . The tensile strength of <br /> stitched joints shall be not less than 100 pounds per inch when tested in accordance <br /> with ASTM D 1682 . <br /> F . Hydrostatic uplift relief shall be provided by installing filter points woven in such a <br /> manner as to permit passage of water through the filter points spaced at approximately <br /> 8-in centers . <br /> PART 3 EXECUTION <br /> 3 . 01 EQUIPMENT <br /> A . Mixing and pumping equipment used in preparation and handling of the grout shall be <br /> approved by the Engineer. All oil or other rust inhibitors shall be removed from the <br /> mixing drums , stirring mechanisms , and other portions of the equipment in contact with <br /> the grout before the mixers are used . The pumping equipment shall have a variable <br /> flow rate to provide enough pressure for pumping without breaking the fabric. <br /> B . All materials shall be accurately measured by volume or weight as they are fed into the <br /> mixer. The quantity of water shall be such as to produce a grout having a pumpable <br /> consistency. Time of mixing shall be not less than one minute . If agitated continuously, <br /> the grout may be held in the mixer or agitator for a period not exceeding 2- 1 /2 hours in <br /> temperatures below 70 degrees F , and for a period not exceeding 2 hours at higher <br /> temperatures . If there is a lapse in a pumping operation , the grout shall be recirculated <br /> through the pump or through the mixer drum (or agitator) and pump . <br /> 3 . 02 CONSTRUCTION METHODS <br /> A . Prior to grout injection , the fabric shall be positioned at its design location . Each panel <br /> shall be a continuous or monolithic unit for its full width , including the trench portion . <br /> F :\Utilities\UTILITY - ENGINEERING\WTP - North RO\N RO Brine Line Discharge - UCP#2208\BID DOCUMENTS North County <br /> RO\BID DOCUMENTS\02271 Fabric Formed Rip Rap.doc <br /> 02271 -2 <br />