Common use of MIXING AND DELIVERY Clause in Contracts

MIXING AND DELIVERY. With every delivery of concrete, Contractor shall furnish a batch ticket indicating the date and time of loading, the batch-mix components by weight, the class of mix, and the additives, if any. Ready-mixed concrete must be mixed and delivered to the point designated on the purchase order by means of one (1) of the following combinations of operations: 1. Mixed completely in a stationary mixer with the mixed concrete transported to the point of delivery in a truck agitator or in a truck mixer operating at agitator speed or in non-agitating equipment when accepted by the on-site ConnDOT engineer 2. Mixed completely in a truck mixer at the batching point or while in transit. Transit-mixed concrete must conform to the provisions of Section 6.01.03 of ConnDOT’s Standards. Transit-mixed concrete water must be introduced into the mixing drum while the mixer is at the batch plant. Each truck mixer must be equipped with a readily visible device that accurately records the number of drum or blade revolutions at mixing speed. 3. Mixed completely in a truck mixer at the point of delivery following the addition of mixing water. Truck-mixed concrete must conform to the provisions of Section 6.01.03 of ConnDOT’s Standards. Truck-mixed concrete water may be introduced into the mixing drum only after arrival at a level area on the site where the concrete is to be placed and under the supervision of ConnDOT personnel. The mixer will be equipped with a device that records the number of drum or blade revolutions during mixing. The concrete must be discharged within one and one-half (1½) hours from the time the dry aggregates are loaded into the truck mixer. Mixing revolutions may not exceed one hundred (100). Mixing beyond one hundred (100) revolutions will be at agitating speeds of not less than 2 nor more than 6 rpm’s. Centrally mixed concrete transported in truck mixers must be at agitatingspeed. Mixing water must be measured accurately by volume or weight by an approved adjustable measuring device that will measure the required quantity under all operating conditions within a tolerance of one (1) quart or one (1) percent. The flow of water must be stopped automatically when the required quantity has been delivered.