2010-238 - Laserfiche WebLink

Home Browse Search

this frequency identified in an FDOT approved QC plan . The accuracy of admixture measuring dispensers will be certified annually by the admixture supplier . When Volumetric Mixers are used for Category I applications , deliver concrete in accordance with the requirements of Volumetric Mixer Manufacturers Bureau (VMMB ) and ensure that the vehicle has a VMMB registered rating plate . 344 -3 . 2 Classes of Concrete : Classes of concrete to be used on the project will be defined in the Contract Documents . 344 -3 . 3 Contractors Quality Control : The Contractor will supply a Quality Control ( QC ) plan to identity to the Agency how quality will be ensured at the project site . During random inspections the Agency will use this document to verify that the construction of the project is in agreement with his QC plan . 344 -3 . 4 Concrete Mix Design : Before producing any concrete , submit the proposed mix design to the Engineer on a form provided by the Agency . Otherwise , the agency will accept mix designs previously described in an FDOT approved QC plan . In any event , use only concrete mix designs having prior approval of the Engineer . Materials may be adjusted provided that the theoretical yield requirement of the approved mix design is met . Show all required original approved design mix data and batch adjustments and substituted material on an Agency approved concrete delivery ticket . The Engineer may disqualify any concrete production facility for non -compliance with specification requirements . 344-3 . 5 Delivery : For cast- in - place applications , the maximum allowable mixing and agitation time of concrete is 90 minutes . Furnish a delivery ticket on a form approved by the Agency with each batch of concrete before unloading at the placement site . The delivery ticket shall be printed . Record material quantities incorporated into the mix on the delivery ticket . Ensure that the Batcher responsible for producing the concrete certifies that the batch was produced in accordance with these Specifications and signs the delivery ticket . The Contractor shall sign the delivery ticket certifying that the concrete was batched , delivered and placed in accordance with these Specifications . The Contractor shall be responsible for rejecting loads of concrete that do not meet the plastic properties of the approve mix design or the minimum compressive strength requirements . At the sole option of the Agency , the Engineer may accept concrete at a reduced pay when it is determined that the concrete will serve its intended function . 344 -3 . 6 Placing Concrete : 344-3 . 6 . 1 Concreting in Cold Weather : Do not place concrete when the temperature of the concrete at placement is below 45 ° F . Meet the air temperature requirements for mixing and placing concrete in cold weather as specified in Section 346 . During the curing period , if NOAA predicts the ambient temperature to fall below 35 ° F for 12 hours or more or to fall below 30 ° F for more than 4 hours , enclose the structure in such a way that the concrete and air within the enclosure can be kept above 60 ° F for a period of 3 days after placing the concrete or until the concrete reaches a minimum compressive strength of 1 , 500 psi . Assume all risks connected with the placing and curing of concrete . Although the Engineer may give permission to place concrete , the Contractor is responsible for satisfactory results . If the placed concrete is determined to be unsatisfactory , remove , dispose of, and replace the concrete at no expense to the Agency . 42 Technical Specifications F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St-USI to 6th Ave\Admim\bid documents\0744 CONTRACT DOCUMENTS\Technical Specifications . doc