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How will this affect the durability of the concrete?

How will this affect the durability of the concrete?. Why is it important to check vibrator frequency? What can result if the the vibrator frequency is too low? What can result if the vibrator frequency is too high? What is the price adjustment for this situation?.

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How will this affect the durability of the concrete?

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  1. How will this affect the durability of the concrete? • Why is it important to check vibrator frequency? • What can result if the the vibrator frequency is too low? • What can result if the vibrator frequency is too high? • What is the price adjustment for this situation?.....

  2. The contractor was batching 1 load every 1.5 minutes. Each load was 7 cubic yards. How many linear feet were placed from 8:30 until 9:45? • 8:30 a.m. to 9:45 a.m. = 1.25 hours • [26’ x (8”/(12”/1’)) x 1’] / 27ft3/yd3 = 0.642 yd3/ linear foot • (7 yd3 / 1.5 minutes) x 60 minutes/hour x 1.25 hours) = 350 yd3 • 350 yd3 / (0.642 yd3/linear foot) = 545.17 linear feet

  3. The paver had 18 vibrators, the outside vibrators were 12” from the edge of the pavement. There was a 3’ gap at the centerline for the steel. How far apart were the vibrators? • 26 ‘ / 2 lanes = 13’ per lane • 12’ – 1’ (outside edge) – 1.5’ (centerline) = 10.5’ with vibrators • 10.5’ / 8 spaces between vibrators = 1.3125‘ between vibrators

  4. How many square yards of concrete will be price adjusted? • Five vibrators were out of specification. • Each vibrator affects 1.3125 lateral feet of concrete. • 5 vibrators x 1.3125 lateral feet / vibrator = 6.5625 lateral feet of concrete affected • 545.17 linear feet x 6.5625 lateral feet = 3577.68 ft2 affected • 3577.68 ft2 / 9 ft2 per yd2 = 397.52 yd2

  5. What is the dollar amount of the price adjustment? • 397.52 Yd2 x $25.60000/Yd2 = $10175.512 • Table C-3 says 90% Payment of Unit Price • $10,176.512 x 10% = $1017.65

  6. Cedar Valley Corp., LLC STP-S-C044(77)—5E-44 Henry 44-C044-077 6-27-16 9:56 a.m. Joe Doe Superintendent Presented 6-27-16 @ 10:10 p.m. Vibrators #3, 6, 7, 14, & 17 exceeded specified vibrations per minute at 9:45 a.m. today 2301.03 A.3.a.6)a)(1) > 8001 and < 9000 vpm on vibrators #3, 6, 7, 14, & 17 4000 – 8000 vpm

  7. Discussed with contractors superintendent – correction made Quantity of concrete affected - 545.17 LF and 1.3125’ lateral per vibrator Decrease vibrator speeds of #3, 6, 7, 14, & 17 to between 4000 & 8000 vpm The Project Inspector’s Signature goes here

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