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Opening of Quotes - North Pumping Station Flood Damage Repairs Proj No. 118-302 - No Quotes Received
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Opening of Quotes - North Pumping Station Flood Damage Repairs Proj No. 118-302 - No Quotes Received
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Board of Public Works
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Projects
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10/12/2021
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<br />Version 08/25/2021 Page - 16 Public Works Quote <br />5. INJECTION GROUTING <br /> <br />A. General Description <br /> <br />Work for this item includes, but is not limited to, the furnishing of all material, equipment, labor, boring <br />& drilling, pumping of cementitious grout slurry, masonry repair, cleanup, temporary dust/debris control <br />measures, cleanup and all other appurtenances required for filling the voids identified in the plans as <br />specified herein. <br /> <br />Contractor shall be responsible to inspect the premises prior to preparing his/her bid to ensure any <br />time, effort and materials related to accessibility constraints are appropriately addressed in the unit cost <br />provided. <br /> <br />Contractor shall note that exterior excavations required for pipe bedding operations will be utilized to <br />inspect/verify the adequate dispersion of injection grouting procedures. The Contractor shall be <br />responsible for appropriately scheduling construction activities to ensure grout installation/inspection <br />occurs prior to backfill. There will be no additional compensation for additional excavation, <br />backfill/compaction if exterior excavations are closed prematurely. <br /> <br />B. Cementitious Slurry <br /> <br />The slurry mixture shall be composed of lime, sand, ground clay, Portland Cement (Type 1A conforming <br />to A.S.T.M. C150), and fly ash in the following proportions by volume: <br />Lime / Fly Ash Mixture passing #50 sieve 100% 27%* <br />Sand passing #4 sieve 100% 15% <br />Ground clay passing #4 sieve 100% 50% <br />Portland Cement – 3 ½ bag mix (approx.) 8% <br /> 100% <br /> <br />*Should Fly Ash and/or Lime not be readily available, increase the amount of Sand by 27% to mixture. <br /> <br />Mix shall be accomplished by use of continuous mixer. All aggregate shall be metered for precise mix <br />design to assure consistent quality control. Slurry material shall be mixed with enough potable water to <br />a workable consistency (3 to 6 inch slump). Material once mixed shall be utilized within two hours and <br />may not be retempered. <br /> <br />The Contactor shall submit proposed mix design to the Engineer for review/approval prior to grouting <br />operations. <br /> <br />C. Grouting Operations <br /> <br />The Contractor shall coordinate injection grouting operations with the Engineer/Owner a minimum of <br />one week in advance of commencing work. The Engineer/Owner shall be present at the time of <br />installation to approve adequate pipe bearing has been achieved prior to concluding work. Grout <br />installed without proper inspection from the Owner/Engineer will not be accepted. <br /> <br />The Contractor shall drill holes by means approved by the Owner/Engineer prior to commencing work. <br />The Contractor shall note that injection grouting operations, or dust/debris resulting therefrom, shall not <br />impede the ongoing facility operations. See temporary dust/debris control measures defined elsewhere <br />in these specifications. The quantity and location of holes shall be as necessary to ensure adequate <br />dispersion of slurry into existing voids. <br /> <br />Masonry shall be thoroughly scraped, brushed and cleaned after completion. <br /> <br />D. Masonry Repair <br /> <br />Holes resulting from grouting operations shall be cleaned by removing excess slurry and wire brushing <br />exposed sidewalls. The surface around the holes shall be dampened and holes shall be filled with a <br />non-shrinking grout composed of 1 part portland cement, 2 parts No. 23 fine aggregate, and an
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