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

I 1 6-02.3(25)C Prestressing I 2 This section, including title, is revised to read: 3 4 6-02.3(25)C Casting I 5 Side forms shall be steel except that cast-in-place concrete closure forms for spliced 6 prestressed concrete girders, interior forms of prestressed concrete tub girders, and end 7 bulkhead forms of prestressed concrete girders may be wood. Interior voids for 8 prestressed concrete slab girders with voids shall be formed by either wax soaked 1 9 cardboard or expanded polystyrene forms. The interior void forms shall be secured in 10 the position as shown in the Working Drawings, and shall remain in place. 11 I 12 All concrete mixes to be used shall be preapproved in the WSDOT plant certification 13 process. The temperature of the concrete when placed shall be between 50°F and 14 90°F. I 15 16 Slump shall not exceed 4 inches for normal concrete nor 7 inches with the use of a high 17 range water-reducing admixture, nor 9 inches when both a high range water-reducing I 18 admixture is used and the water/cement ratio is less than or equal to 0.35. For self- 19 consolidating concrete (SCC), the slump requirements specified above do not apply, 20 and are instead replaced by the target slump flow and slump flow range specified as I 21 part of the SCC mix design. 22 23 Air-entrainment is not required in the concrete placed into prestressed concrete girders, 24 including cast-in-place concrete closures for spliced prestressed concrete girders. I 25 26 This section is supplemented with the following new sub-section: 27 I 28 6-02.3(25)C1 Acceptance Testing of Concrete for Prestressed Concrete Girders 29 Compressive strength cylinders and concrete acceptance testing shall be performed 30 once per prestressed concrete girder or once per fabrication line of prestressed I 31 concrete girders. Concrete shall not be placed until fresh concrete testing indicates 32 concrete is within acceptable limits. 33 I 34 Acceptance testing shall be performed by the Contractor and test results shall be 35 submitted to the Engineer. Unless otherwise noted below, the test methods described 36 in Section 6-02.3(5)D shall be followed. Concrete compressive strength shall be in I 37 accordance with Section 6-02.3(25)E. 38 39 Concrete that is not self-consolidating concrete will be accepted as follows: 40 41 1. Temperature within the allowable temperature band. 42 43 2. Slump below the maximum allowed. I 44 45 Concrete that is self-consolidating concrete will be accepted as follows: 46 I 47 1. Temperature within the allowable temperature band. 48 49 2. Slump flow within the target slump flow range. 1 50 51 3. VSI less than or equal to 1 in accordance with ASTM C 1611, Appendix X1, 52 using Filling Procedure B. 1 I AMENDMENTS TO THE 2014 STANDARD SPECIFICATIONS BOOK Revised: 8/3/15