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r <br /> ' ® ® ❑ Kimley- Horn <br /> and Associates, Inc . <br /> r <br /> r July 1 , 2003 <br /> 047035008 ■ <br /> Suite 400 <br /> 60121st Street <br /> ' Vero Beach, Florida <br /> Mr. Clyde Ellis 32960 <br /> VSL <br /> 3000 SW 10th Street <br /> rPompano Beach, FL 33069 <br /> Re : Pre -Bid Questions <br /> r Oslo and 43rd Avenue Intersection Improvements <br /> Indian River County <br /> ' Dear Mr. Ellis , <br /> We have reviewed the faxed questions regarding post-tensioning criteria for the <br /> above referenced project and offer the following responses : <br /> rQuestion # 1 The Technical Provisions make reference to the MOT Standard <br /> Specifications for Road and Bridge Construction, 1991 and <br /> r Supplemental Specifications ( 1994) as the applicable <br /> specifications ( 1994) as the applicable specifications for the <br /> project. What post-tensioning specification will be required for <br /> ' this project since the Section B460 in the Supplemental <br /> Specifications has completely changed over the last year? <br /> ' Response # 1 The original plans were designed in accordance with MOT <br /> Standard Specifications for Road and Bridge Construction <br /> ( 1991 ) with 1994 Supplemental Specifications . Since that time , <br /> the MOT has discovered that many post-tensioned bridges are <br /> rexperiencing corrosion of the post-tension strands resulting from <br /> a combination of water intrusion and incomplete grouting of <br /> post-tensioning ducts . The latest MOT specifications <br /> incorporate various shop drawing, fabrication and construction <br /> requirements to help alleviate this problem. Therefore, the <br /> following sections of the latest MOT post-tensioning <br /> ' specifications would be recommended to supplement the design <br /> specifications indicated in the plans : <br /> r 462 -2 Certification of Post-tensioning Systems : Standard <br /> tendon sizes are 40 . 611 , 7x0 . 6 " , 12x0 . 6" , 19x0 . 6 " and <br /> 27x0 . 6 " . <br /> t <br /> r <br /> ■ <br /> ' TEL 772 562 7981 <br /> FAX 772 562 9689 <br />