SUPERPAVE Digest 464

Topics covered in this issue include:

1) AC-30

by "L.R. Allen" <>

2) RE: AC-30

by "Byrd, Matt" <>

3) RE: AC-30

by "Burke, Kevin"

  • To:
  • Subject: AC-30
  • From: "L.R. Allen" <
  • Date: Tue, 22 May 2001 09:46:12 -0700 (PDT)

SHELL BITUMEN CCA IS SELLING AN AC-30 THAT IS ALSO A

PG 70-22 NEAT. CENTRAL AMERICA IS RELUCTANT TO ADAPT

TO THE PG SYSTEM BECAUSE OF THE COST OF LABORATORY

EQUIPMENT.

I HAVE BEEN TRYING TO FIND INFORMATION ON THE AC-30

GRADE TO JUSTIFY THE USE OF THIS PRODUCT IN OUR WARMER

CLIMATES. CAN ANYONE PLEASE ASSIST ME?

THANK YOU

L.R. BILL ALLEN

ASESOR TECNICO DE PAVIMENTOS

SHELL BITUMEN

  • To: "''" <
  • Subject: RE: AC-30
  • From: "Byrd, Matt" <
  • Date: Tue, 22 May 2001 12:52:14 -0500

Mr. Allen,

Commonly used specs for AC-30 are as follows.

AASHTO M226-80

TABLE 2 Requirements for Asphalt Cement Graded by Viscosity at 60 C (140

F) (Grading Based On Original Asphalt)

Viscosity, 60 C (140 F), poises3000+/-600

Viscosity, 135 C (275 F), Cst-minimum350

Penetration, 25 C(77 F), 100 g, 5 sec-minimum50

Flash Point, COC, C (F)-minimum242

Solubility in trichloroethylene, percent-minimum99.0

Test on residue from thin-film oven test:

loss on heating percent-maximum (optional)0.5

Viscosity, 60 C (140 F), poises-maximum12,000

Ductility, 25 C (77 f), 5 cm per

40

Spot test (when and as specified) with:

Standard naphtha solventNEG

Naphtha-Xylene-solvent, % XyleneNEG

Good luck.

Matthew Byrd

Tfifinery Petroleum Services

361-289-6762

  • To: "''" <
  • Subject: RE: AC-30
  • From: "Burke, Kevin" <
  • Date: Tue, 22 May 2001 17:11:07 -0500

If you want a PG 70-22 Neat be careful specifying an AC-30. Some states have

a PG 67-22 specification. This grade usually translates to an AC-30 vis

grade. If you request an AC-30, you may not get a product that meets PG

70-22 criteria.

SUPERPAVE Digest 465

Topics covered in this issue include:

1) Re: AC-30

by "Shimon Nesichi"

  • To: <
  • Subject: Re: AC-30
  • From: "Shimon Nesichi" <
  • Date: Wed, 23 May 2001 09:36:01 +0200

We in our hot climate use either AC-30 or AC-40. Based on our experience the

AC-30 is PG-70 about 70% of the time and PG-64 for the rest of the time.

AC-40 is always PG-70. We have used in the past AC-20 and even 60-70 , in

both cases we had a lot of bleeding and rutting problems. The shift to AC-30

and AC-40 almost eliminated these problems (in addition to changes in

gradation, etc.)

Nesichi, Civil Eng., M.Sc.,

Managing Director

Materials & Research Division

Public Works Department

Ministry of Transportation

Ben Zvi Rd. 55, POB 49057

Tel Aviv 61940

ISRAEL

email:

Fax:972-3-6820746

Phone:972-3-6836362

SUPERPAVE Digest 468

Topics covered in this issue include:

1) Re: AC-30

by Michael Dunning <>

  • To:
  • Subject: Re: AC-30
  • From: Michael Dunning <
  • Date: Tue, 29 May 2001 07:57:26 -0700

In the clark county nevada hot climate we are using PG 76-22 with success but the main factor in anti-rutting is aggregate gradation.

We also use AC-40 but this will cause a potential for cold weather cracking.