|701.13 Fly Ash for Use in Portland Cement Concrete|
Sections 701.13 C&MS.
2. Sampling and/or Inspection Requirements:
Approval for use of fly ash will be under one of the following acceptance plans:
Fly Ash Certification:
Fly Ash shall be certified according to S-1026. Refer to the Certified Supplier list maintained on the OMM website http://www.dot.state.oh.us/Divisions/ConstructionMgt/Materials/Pages/CertifiedSuppliers.aspx to determine if the Producer is certified status. If certified, it may be used immediately.
Obtain samples in accordance with sampling procedures at a minimum of one sample per 180 days from each Ready Mix Producer for each class of fly ash used in production for State jobs.
Only an original bill of lading with certification statement shall be acceptable. All samples shall be submitted to the OMM Cement and Concrete Section in a one-half gallon friction-top, airtight container supplied by the Department. The TE-31 with an original copy of the bill of lading attached shall be placed in a sealed envelope. The envelope and a completed TE-10 shipping tag shall be securely attached to the container. (Field)
Uncertified Fly Ash:
Uncertified Fly Ash is a material type not listed on the certified list and must be sampled, tested and approved by the Department before use. (OMM).
Take one sample for every 100 tons, or fraction thereof. Attach one copy of the bill of lading to the TE-31. (Field)
Sampling shall be by the "grab sample" method, using one of the following procedures. (Field)
Sample Scooped from Top of Load
This method of sampling is carried out from the top of the delivery tanker through an open manhole. The top six inches of fly ash should be pushed aside in the area where the sample will be taken. The sample is then scooped from the exposed fly ash, making sure that at least ten pounds of fly ash is obtained for the sample. A half-gallon container, securely fastened to the end of a pole, should enable the sampler to obtain the sample in two or three scoops. Tap the sample container sharply several times to facilitate settling the fly ash.
Sampling by Use of Sampling Tube
The sample is taken through the open manhole on top of the delivery tanker. The sampling tube is forced vertically through the full depth of the fly ash. The hole is closed and the tube withdrawn and emptied into the sampling container. Tap the sample container sharply several times to facilitate settling the fly ash. This is repeated until the ten pound sample is obtained.
Packaged Fly Ash Sample:
The sample shall consist of a composite obtained by sampling one bag for each 125 bags, or fraction thereof, delivered. The sample increment is obtained by forcing a sampling tube diagonally through the sampling port to the full depth of the bag. The hole is closed and the tube withdrawn and emptied into the sampling container. Approximately equal increments shall be taken from each sampled bag to make up the total sample. Tap the sample container sharply several times to facilitate settling the fly ash.
3. Methods of Tests:
(OMM Cement and Concrete Section)
ODOT C&MS 701.13