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Concrete deposited under slurry shall contain not less than 400 kg of cementitious material per cubic meter. <br /> shall be either the 25-mm <br /> The combined aggregate grading used in concrete for cast-in-drilled-hole concrete <br /> n and Shikonform to the requirements <br /> maximum grading,the 12.5-mm maximum grading,or the 9.5-mm maximum grading <br /> in Section 90-3"Aggregate Gradings,"of the Standard Specifications. <br /> Mineral Slurry tanks <br /> shall be mixed and thoroughly hydrated in slurry tanks,and slurry shall be sampled from the slurry <br /> Mineral slurry <br /> and tested before placement in the drilled hole. <br /> Slurry shall be recirculated or continuously agitated in the drilled hole to maintain the specified propack �the drilled <br /> Recirculation shall include removal of drill cuttings from the slurry before discharging �' its use until <br /> hole. When recirculation is used, the slurry shall be sampled and tested at least every 2 hours after beginning <br /> urry tank and from near the bottom of the hole have consistent specified <br /> tests show that the samples taken from the sl <br /> properties. Subsequently,slurry shall be sampled at least twice per shift as long as the specified properties remain cog itsususe <br /> Slurry that is not recirculated in the drilled hole shall be sampled and tested at least every 2 hours after beginning <br /> The slurry shall be sampled mid-height and near the bottom <br /> f the hole don ole. Slurry shall be recirculated when consistent specified properties.tests show that the <br /> samples taken from mid-height and near the bottom o placing <br /> Slurry shall also be sampled and tested prior to final cleaning of the bottom of the hole of the bottom of theole and <br /> concrete. Samples concrete hbe allen from not start untiletesttss show thaht and near te bottom thesamples taken fromthe hole. Cleaning mid-height and near the bottom of the <br /> placement of the con <br /> hole have consistent specified properties• table: <br /> Mineral slurry shall be tested for conformance to the requirements shown in the following <br /> MINERAL SLURRY <br /> PROPERTY RE UIREMEN 1 TEST <br /> Density(kg/m3) <br /> -before placement 1030*to 1110* <br /> Mud Weight <br /> in the drilled hole (Density) <br /> -during drilling API 13B-1 <br /> -prior to final 1030*to 1200* Section 1 <br /> cleaning <br /> immediately prior <br /> to lacm concrete <br /> Viscosity Marsh Funnel and <br /> (seconds/liter) Cup <br /> 53 API 1313-1 <br /> 29 to <br /> bentonite Section 2.2 <br /> attapulgite 29 to 42 <br /> PH to 10.5 Glass 7E -- <br /> 8rode pH <br /> MeterH Paper <br /> Sand Content Sand <br /> (percent) API 1313-1 <br /> -prior to final less than or equal to Section 5 <br /> cleaning 4.0 <br /> -immediately prior <br /> toplacing concrete <br /> *When approved by the Engineer, slurry may be used in salt <br /> water, and the allowable densities may be increased up to <br /> 32 kg/m3. <br /> Sl tem erature shall be at least 4°C when tested. <br /> Contract No. 10-OM7104 <br /> 158 <br />