1.3.8 The inspector should verify that the scales and other measurement systems have been properly calibrated within the time period specified by the project specifications or referenced documents 1.3.9 The capability of the production facility to produce concrete within the temperature limits of the project specifi- cation should also be evaluated and verified. In cold weather this generally requires a water and aggregate heating capacity of 15 boiler horsepower per 100 yd 3 (76 m 3 ) production. In hot weather, this generally requires a system for spraying and cooling aggregates and a system for effi- ciently weighing and delivering crushed ice to the mixer in the range of 40 to 100 lb per yd 3 (18 to 45 kg perm\ 1.3.10 For each batch of concrete the inspector should verify that the concrete plant is furnishing to the purchaser a delivery ticket conforming to ASTM C 94/C 94M. A place
ACI MANUAL OF CONCRETE INSPECTION 193 should be provided on the ticket to reflect the following information: • Name of the concrete plant; Serial number of the ticket; Date; Truck number; Name of the purchaser; Project designation (name and location); Class or designation of concrete; Amount of concrete hatched; Time hatched; The amount of water added by receiver of concrete and receiver's initials; • The amount of water withheld during hatching, if any, and the admixtures that may be added at the jobsite; and Any additional information required by the purchaser or the project specification. 1.4-Reports 1.4.1 The inspector should sign the delivery ticket, issue an inspection report, or supply other evidence that the concrete hatching has been inspected. 1.4.2 The inspector should issue a daily inspection report showing all test results and documenting observations made during the day. Deficiencies and to whom they were reported should be clearly identified. The ACI Manual of Concrete Inspection (SP-2) contains guidance on reporting and samples of reports. CHAPTER 2-TESTING OF READY -M IXED CONCRETE 2.1-lntroduction and scope This chapter recommends minimum requirements for the testing of ready-mixed concrete at the project site when required by specifications. It includes requirements for curing of specimens, testing of specimens for strength, and qualification requirements for testing technicians and labora- tories. It is intended for use by specifiers, architects, engi- neers, owners, contractors, or other groups interested in monitoring the concreting activities at the project site through the use of an independent inspection agency or in -house inspection organization. 2.2-Qualifications Technicians conducting field tests of concrete are required by ASTM C 94/C 94M to be certified as an ACI Concrete Field Testing Technician-Grade I, or equivalent. For labora- tory testing, ACI certification as a Laboratory Testing Techni- cian or Concrete Strength Testing Technician, or equivalent, is required. ·Technicians should also be furnished with and become familiar with published standards as referenced in this guide and with project specification requirements.
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