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  <br />CITY OF SUNNY ISLES BEACH SECTION 03400 - 2 <br />CEMENT GROUT <br />  <br />2.3 BENTONITE <br /> <br />Bentonite furnished for cementing shall be raw bentonite and be added at the bulk facility and <br />thoroughly mixed at the ratio specified. Small batches (less than 50, 94 lb. bags of cement) of grout <br />may be mixed on site. <br /> <br />PART 3- EXECUTION <br /> <br />3.1 GROUTING <br /> <br />A. The CONTRACTOR is solely responsible for the successful execution of grouting. <br />Annular grout shall be in conformance with all applicable local and state regulations. <br /> <br />B. The CONTRACTOR is solely responsible for defects in the grout or grouted interval. <br />The CONTRACTOR shall take all precautions to protect the casing from collapse or <br />damage during grouting. Any defects in the grout job or casing damage resulting from <br />grouting shall be corrected by the CONTRACTOR at his own expense. <br /> <br />C. The CONTRACTOR shall provide adequate notice prior to cementing to enable the <br />ENGINEER to observe all cementing operations. <br /> <br />D. Provide a method of measurement to determine the weight in pounds per gallon of <br />cement slurry to confirm proper mix ratios. Samples of the cement slurry shall be <br />collected, weighed and recorded. The correct mix ratios shall be maintained. If <br />performed in batches, provide slurry weight and collect sample for each batch mixed. If <br />performed in continuous mixing, provide slurry weights and collect samples at the <br />beginning, middle, and end of pumping for each grouting stage. <br /> <br />E. If grouting is to be conducted in stages, the top of the hardened grout from the previous <br />grouting stage will be measured in the presence of the ENGINEER prior to each <br />cementing stage. Each cementing stage shall be given 12 hours of curing time prior to <br />resuming cementing. It is the responsibility of the CONTRACTOR to determine the <br />collapse strength of the casing and the appropriate amount of grout for each grouting <br />stage. Cementing calculations shall be reviewed with the ENGINEER in advance of <br />each grouting stage. Grout shall be allowed to cure for 48 hours before continuation of <br />drilling operations. <br /> <br />F. During grouting, the casing is to be filled with water and pressurized to 60 pounds per <br />square inch (psi). This pressure shall be maintained during cement emplacement and <br />the cement set up period for 8 hours following the grout stage completion. Clear water <br />shall be circulated within the casing from bottom to top to cool the casing during the set <br />up period.