HANDLING AND STORAGE OF ASPHALTS

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HANDLING AND STORAGE OF ASPHALTS

• By
• Shauna-May TecleMariam
• US Oil Refining Co.

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FIRST STEP

• Quality starts with the supplier
• Products must be loaded correctly
• Most suppliers take retains of their product

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ASPHALT LOADING RACK
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CONTAINER
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CONTAINER LOADING
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SPECIALITY ASPHALT LOADING RACK
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PAVING
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MODIFIED ASPHALTS
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NEAT ASPHALT
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MODIFIED ASPHALT
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MODIFIED ASPHALT
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MODIFIED ASPHALT
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UNIFORMITY OF MODIFIED ASPHALTS

• The statement has been made that you must keep
  the modified asphalt hot so that the polymer does
  not come out of solution.
• THIS STATEMENT IS FALSE!

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UNIFORMITY OF MODIFIED ASPHALTS

• If you are concerned about the homogenialty of
  the modified asphalt, ask your supplier.
• The supplier should guarntee the uniformity.
• You should ask to see the suppliers data on this
  issue.

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UNIFORMITY OF MODIFIED ASPHALTS

• The main reason is that all suppliers make their
  modified asphalts differently.
• The supplier uses the modified that works with
  their unique asphalt. Suppliers use different
  crudes and different processes to make the
  asphalt.

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TANKS

• All storage tanks should have a way of mixing the
  product.
• The recommended method is by a mixer.
• The other method is to circulate the tank from
  top to bottom.

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MIXER
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STORAGE
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SHORT TERM STORAGE

• Short term storage would be anything less than a
  week.
• For conventional asphalts, the general
  recommended temperature range for short-term
  storage is 270 - 300F (132 - 149C). You must
  check with your supplier for actual temperature
  range.

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SHORT TERM STORAGE

• For modified asphalts, the general recommended
  temperature range for short-term storage is 300 -
  360 F (149 -182C). You must check with your
  supplier for actual temperature range.

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LONG TERM STORAGE

• Long term storage is defined as three (3) week
  maximum.
• For conventional asphalts, the general
  recommended temperature range for long-term
  storage is 230 - 290 F (110 -143 C). You must
  check with your supplier for actual temperature
  range.

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LONG TERM STORAGE

• For modified asphalts, the general recommended
  temperature range for long-term storage is 250 -
  300 F (122-149 C). You must check with your
  supplier for actual temperature range.

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EXTEND STORAGE

• Extended storage will be defined as anything over
  three (3) weeks.
• Allow all asphalts (conventional and modified)
  to go cold. No heat is recommended. You must
  check with your supplier on recommendations for
  reheating the product. Slow heating is generally
  the rule.

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SAMPLING
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SAMPLING OF ASPHALTS

• The sampling of asphalt should be done according
  to AASHTO M156, which is identical to ASTM D955
  except for one paragraph.
• Both methods describe a sampling tap and valve.
• Enough asphalt must be discharged to displace the
  asphalt in the line, generally this is a minimum
  of 4 gallons of product.

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SAMPLING VALVE
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SAMPLING OF ASPHALTS

• Correct sampling containers is very important.
• Only clean, dry cans should be used for asphalt
  samples.
• Cans should be seamless with no soldered filing
  inside the can.
• No recycled or reused cans are acceptable.

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SAMPLING CONTAINERS
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DONT OF SAMPLING

• Dont use any kind of solvent, grease, or diesel
  on the sample valve or on the outside of the can.
  It may be cheap and fast. You will pay for it, in
  out of specification product when it is tested.
• Dont use a hose for sampling. If a hose is used,
  you should consider it disposable.

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CONTAMINATION
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1 TEASPOON IS 5 MLS
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QUART VOLUME
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CONTAMINATED SAMPLE
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PG64-28 WITH DIESEL
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CHANGING GRADES
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CHANGING GRADES

• Everyone is going to change grades of asphalt in
  their tank at some point.
• There is almost always going to be a heel in the
  tank of the last product.
• How does that effect the next grade?

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CHANGING GRADES

• Going from a softer grade to a harder grade
• Example PG52-28 in the tank and going to use
  PG64-28

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CHANGING GRADES

• Did you clean your tank first?
• How much of a heel do you have in your tank?
• Say you have a 10000 gallon tank with the pump
  suction at 24 inches from the bottom. You would
  have around 1800 gallons retain. This is an 18
  heel in the tank.

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SOFT TO HARDER ASPHALT
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SOFTER TO HARDER ASPHALT
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CHANGING GRADES

• Going from a harder grade to a softer grade
• Example PG64-28 in the tank and going to use
  PG52-28

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CHANGING GRADES

• Did you clean your tank first?
• How much of a heel do you have in your tank?
• Say you have a 10000 gallon tank with the pump
  suction at 24 inches from the bottom. You would
  have around 1800 gallons retain. This is an 18
  heel in the tank.

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HARD TO SOFTER ASPHALT
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HARD TO SOFTER ASPHALT
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HARD TO SOFTER ASPHALT
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SAMPLES FOR DSR TESTING
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DSR
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THANK YOU

• US OIL REFINING CO.
• 253-383-1651