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<br />Specifications (MOSHA) <br /> <br />Grout: <br /> <br />Portland cement concrete shall consist of nine bags, 55.8 kg/m3 (94 Ib per cubic yard) Type <br />II Portland cement, air entrainment, 6 :t 1 percent mortar sand aggregate, and water so <br />proportioned to provide a pumpable mixture. The 28 day minimum day strength shall be 24 <br />140 kPa (3500 psi). <br /> <br />~: <br /> <br />Fabric bags shall be made of high strength water permeable fabric of nylon or cordura. <br />Each bag shall be provided with a self closing inlet valve, to accommodate insertion of the <br />concrete hose. A minimum of two valves shall be provided for bags more than 6.1 m (20 ft) <br />long. Seams shall be folded and double stitched. <br /> <br />Dowels: <br /> <br />Reinforcing steel dowels, if specified on the plans, shall conform to ASTM A 615, Grade 60 <br />and shall be epoxy coated. <br /> <br />Fabric: <br /> <br />Fabric shall exhibit the following properties in both warp and fill directions: <br /> <br />Tensile Strength, min. <br />Tear Strength, min. <br /> <br />70 kNlm <br />400N <br /> <br />(4oolb/in) <br />(901b) <br /> <br />ASTM D 1682, Grab Method <br />ASTM D 2262, Tongue Method <br /> <br />Construction: <br /> <br />The bags shall be positioned and filled so that they abut tightly to each other and to the <br />substructure units. Joints between bags in successive tiers shall be staggered. <br /> <br />Fabric porosity is essential to the successful execution of this work. Suitability of fabric <br />design shall be demonstrated by injecting the proposed mortar mix into three 610 mm (2 ft) <br />long by approximately 150 mm (6 in) diameter fabric sleeves under a pressure of not more <br />than 103 kPa (15 psi) which shall be maintained for not more than 10 minutes. A 300 mm <br />(12 in> long test cylinder shall be cut from the middle of each cured test specimen and tested <br />in accordance with ASTM C 39. The average seven day test compressive strength of the <br />fabric form shall be at least higher than that of companion test cylinders made in accordance <br />with ASTM C 31. <br /> <br />Standoffs to provide a uniform cross section shall be used. <br /> <br />Ready mixed high strength mortar may be permitted by written permission of the Engineer. <br />The ready mixed high strength mortar shall be furnished by a manufacturer approved by the <br />Laboratory and the plan, equipment, etc., shall be subject to inspection and approval. <br /> <br />The concrete pump shall be capable of delivering up to 19 m3/hr (25 yd3/hr). <br /> <br />7.5 <br />