TR-3 Concrete Design Mix in NYC

PLEASE NOTE A TR-3 FORM IS REQUIRED FOR THIS PROJECT.
1905.3 Proportioning on the basis of field experience and/or trial mixtures. Concrete proportioning determined on the basis of field experience or trial mixtures shall be done in accordance with ACI 318, Section 5.3. If the required f’ c is obtained for trial batch mixes prior to the date specified, the trial mix design may be approved. All mixes shall be approved by the registered design professional of record. prior to construction.