Ariston Pacific, Inc. 5/9/2016 - Laserfiche WebLink

1 2 4. J ring passing ability less than or equal to 1.5-inches. 3 4 5. Rapid assessment of static segregation resistance of self-consolidating 5 concrete using penetration test in accordance with ASTM C 1712 shall be less 6 than or equal to 15 mm. 1 7 8 6-02.3(25)D Curing 9 The first paragraph is revised to read: 10 11 During curing, the Contractor shall keep the girder in a saturated curing atmosphere 12 until the girder concrete has reached the required release strength. If the Engineer 13 concurs, the Contractor may shorten curing time by heating the outside of impervious 14 forms. Heat may be radiant, convection, conducted steam, or hot air. With steam, the 15 arrangement shall envelop the entire surface with saturated steam. Hot air curing will 16 not be allowed, unless the Contractor submits Type 2 Working Drawings consisting of 17 the proposed method to envelop and maintain the girder in a saturated atmosphere. 18 Saturated atmosphere means a relative humidity of at least 90 percent. The Contractor 19 shall never allow dry heat to touch the girder surface at any point. 20 21 6-02.3(25)E Contractors Control Strength 22 This section is revised to read: 23 24 Concrete strength shall be measured on test cylinders cast from the same concrete as 25 that in the girder. These cylinders shall be cured under time-temperature relationships 26 and conditions that simulate those of the girder. If the forms are heated by steam or hot 27 air, test cylinders will remain in the coolest zone throughout curing. If forms are heated 28 another way, the Contractor shall provide a record of the curing time-temperature 29 relationship for the cylinders for each girder to the Engineer. When two or more girders 30 are cast in a continuous line and in a continuous pour, a single set of test cylinders may 31 represent all girders provided the Contractor demonstrates uniformity of casting and 32 curing to the satisfaction of the Engineer. 33 34 The Contractor shall mold, cure, and test enough of these cylinders to satisfy 35 Specification requirements for measuring concrete strength. The Contractor may use 4- 36 by 8-inch or 6- by 12-inch cylinders. 37 38 Test cylinders may be cured in a moist room or water tank in accordance with WSDOT 39 FOP for AASHTO T 23 after the girder concrete has obtained the required release 40 strength. If, however, the Contractor intends to ship the girder prior to the standard 28- 41 day strength test, the design strength for shipping shall be determined from cylinders 42 placed with the girder and cured under the same conditions as the girder. These 43 cylinders may be placed in a noninsulated, moisture-proof envelope. 44 45 To measure concrete strength in the girder, the Contractor shall randomly select two 46 test cylinders. The average compressive strength of the two cylinders shall be equal or 47 greater than the specified strength and neither cylinder shall have a compressive 48 strength that is more than 5% below the specified strength. 49 50 If too few cylinders were molded to carry out all required tests on the girder, the 51 Contractor shall remove and test cores from the girder under the surveillance of the 52 Engineer. If the Contractor casts cylinders to represent more than one girder, all girders I AMENDMENTS TO THE 2014 STANDARD SPECIFICATIONS BOOK Revised: 8/3/15