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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 Created August 20, 2015 Page 41 SP 0202-101 (3.3) With securely placed tight fitting plastic caps on plastic molds, or by other methods to prevent moisture loss. (3.4) Protected from jarring, bouncing, and freezing. (3.5) No greater than 4 hours, unless cylinders are maintained in the moistened condition at ambient temperature of 60 °F to 80 °F. G.5.a Moist Curing Environments At least 24 hours prior to concrete placement, provide moist curing environment(s) of adequate size and number, including all ancillary equipment and materials, necessary to maintain moist curing environment(s) in accordance with ASTM C31, 2031.3.C, "Special Requirements," and the following: For each separate moist curing environment: (1) Provide a calibrated waterproof digital temperature recording device that records the daily maximum and minimum ambient temperatures for the previous 7 days. (2) Maintain the standard (28-day) strength cylinders or beams in an ambient temperature range from 60 °F to 80 °F during the initial and intermediate curing periods. The Engineer will monitor the daily temperatures of the curing environments. Agency monitoring does not relieve the Contractor of the responsibility to maintain the water temperature as specified herein. If the Contractor fails to comply with the requirements shown here -in, the Engineer may delay concrete placement and will consider any concrete incorporated into the work as unauthorized in accordance with 1512.2, "Unauthorized Work." The Engineer will consider any delays to the Contract resulting from unauthorized work as non -excusable in accordance with 1806.2.C, "Non -Excusable Delays." All costs related to providing and maintaining moist curing environments is considered incidental. G.5.b Standard (28-day) Strength Cylinders The Engineer will perform the following for standard strength cylinders: (1.1) Cast cylinders (sets of 3) for testing at 28 days in accordance with the Schedule of Materials Control. (1.2) Mark cylinders for identification of the represented unit or section of concrete in accordance with the following: (1.1, 1.2, 1.3/ 2.1, 2.2, 2.3/ 3.1, 3.2, etc.). In order to differentiate between portions of a project, prefixes and suffixes are allowed. (1.3) Cure the cylinders meeting the requirements of the 2461.3.G.5.a, "Moist Curing Environments." (1.4) Complete the MnDOT Concrete Cylinder Identification Card including the results for air content, slump (if required), concrete, and air temperature testing from the same load. The Concrete Engineer defines the curing period as the following: (2.1) Initial curing period as immediately after final finishing for a period of up to 48 hours. After the initial curing period, the Engineer will both transport and further cure the cylinders in the provided curing tanks for intermediate curing up to 7 days from the day of casting or deliver directly to the laboratory for final curing. (2.2) Intermediate Curing Period as the time between specimen pickup from the initial curing site and delivery to the laboratory for final curing, not to exceed 7 days from the day of casting. (2.3) Final Curing Period as the time when cylinders are cured in the laboratory within 7 days of casting. S-32.32 MnDOT 2461.3.G.5.c shall be deleted and replaced with the following: