1905.3.5 Field changes to concrete proportions.
BC § 1905.3.5
Based on test data and observations during the course of construction, the following changes described in Sections 1905.3.5.1 and 1905.3.5.2 are permitted without requiring additional trial mixtures or field strength test records, provided: 1. There are no changes to the type and source of materials described in Sections 1905.3.3 and 1905.3.4, except as permitted in Sections 1905.3.5.1 and 1905.3.5.2; 2. Documentation of these changes are maintained by the concrete producer and the concrete contractor; 3. The changes described in Section 1905.3.5 cannot be used for the submission of an initial mix design to demonstrate that a previously prepared mix design meets strength or air content requirements that differ from the required concrete properties without new field strength test records or new trial mix designs; 4. Where required in Section 1905.3.5, documentation of these changes shall be submitted for acceptance to the registered design professional of record for the structural design by the concrete producer prior to use; 5. Copies of the revised mixtures shall be maintained at the construction site and provided to the licensed concrete testing laboratory performing the acceptance testing of concrete in accordance with Item 4 of Table 1705.3 of this code; and 6. The documentation required by Items 2 and 5 above shall be made available to the commissioner upon request.
