TR-2 Concrete test Cylinders (BC 1905.6)
PLEASE NOTE A TR-2 FORM IS REQUIRED FOR THIS PROJECT
1905.6 Evaluation and acceptance of concrete. The criteria for evaluation and acceptance of concrete shall be as specified in Sections 1905.6.2 through 1905.6.5.5.
1905.6.2 Frequency of testing. The frequency of conducting strength tests of concrete shall be as specified in Sections 1905.6.2.1 through 1905.6.2.4.
1905.6.2.1 Minimum frequency. Samples for strength tests of each class of concrete placed each day shall be taken not less than once a day, nor less than once for each 50 cubic yards (38 m3) of concrete nor less than once for each 5,000 square feet (465 m2) of surface area for slabs or walls. For concrete mixes proportioned for durability requirements specified in Section 1904, the registered design professional of record shall specify additional field testing of the concrete for unit weight, air and water content. At the discretion of the registered design professional of record, the frequency of testing may be reduced, but not less than once for each 150 cubic yards (115 m3).1905.6.2 Frequency of testing. The frequency of conducting strength tests of concrete shall be as specified in Sections 1905.6.2.1 through 1905.6.2.4.
1905.6.2.2 Minimum number. On a given project, if the total volume of concrete is such that the frequency of testing required by Section 1905.6.2.1 would provide less than five strength tests for a given class of concrete, tests shall be made from at least five randomly selected batches or from each batch if fewer than five batches are used.
1905.6.2.3 Small volume. When the total volume of a given class of concrete is less than 50 cubic yards (38 m3), and the concrete is nonstructural and is not subject to the durability requirements of Section 1904, testing may be waived by the registered design professional of record.