2021-03-16_REVISION - M1977300 (13)

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Crm�� CRMCA Concrete Quality Pre-Construction Checklist Contractor's Responsibilities in accordance with ACI 301-10 Section 1.6.2 • Allow access to the project site or to the source of materials and assist Owner's testing agency in obtaining and handling samples at the project site or at the source of materials. • Advise Owner's testing agency at least 24 hours in advance of operations to allow for scheduling of quality assurance tests, review of project requirements, and for the assignment of personnel. • Provide space and source of electrical power on the project site for facilities to be used for initial curing of concrete test specimens as required by ASTM C31 for the sole use of Owner's quality assurance testing agency. Concrete Sampling and Testing Requirements Sampling Frequency: Sampling Location: (Circle Yes or No) Pt. of truck discharge (in accordance with ASTM C94) yes no Pt. of placement (must be specified and comply with OSHA regulations) yes no Note 2: The concrete supplier will be responsible for compliance when samples are obtained at truck discharge after 10% or before 90%of the batch has been discharged and tests are conducted in accordance with applicable ASTM standards. Tests to be performed on each sample: (Circle Yes or No) Slump: yes no Compressive Strength: yes no Air Content: yes no #cylinders per test Density (unit wt.): yes no Flexural Strength: yes no Temperature: yes no Other: yes no Note 3:ASTM C172, section 4.1.1 states. "Transport the individual samples to the place where fresh concrete tests are to be performed or where test specimens are to be molded."Section 4.1.2 states, "Start tests for slump, temperature and air content within 5 min. after obtaining the final portion of the composite sample." Acceptance/Rejection of Fresh Concrete: Who has the authority to accept or reject a concrete delivery? What criteria will be used to accept or reject a concrete delivery? (Circle Yes or No) Slump: yes no Temperature: yes no Air Content: yes no Density(unit wt.) yes no W/CM Ratio: yes no Time Limit: yes no Note 4:ASTM C94, section 7.2 states, "the producer shall not be responsible for the limitation of minimum slump or slump flow after 30 min. have elapsed starting either on arrival of the vehicle at the prescribed destination or at the requested delivery time,whichever is later." Who's responsible for adding water and/or air entrainment at the project site? Note 5: ASTM C94 section 12.7, allows a'one-time'water addition as long as the maximum water content for the batch as established by the mixture design proportions has not been exceeded. A'one-time'water addition may be several distinct additions provided no concrete has been discharged except for slump or slump flow testing. When air content is below the specified level, Section 8.3 allows the concrete supplier to adjust the level with additional air-entraining admixture. CRMCA Document#TC-01 Page 2 Revised 7.23.15