Bituminous paving mixtures containing lubricating agents or additives may be prepared at hot mix temperatures and cooled, paved and compacted at temperatures 10-55Â° C. lower than the hot mix temperatures. The increased temperature range between the hot mix temperatures and the paving and compacting temperatures is facilitated by the improved compacting properties of the paving mixture when it includes the lubricating agents or additives.

Claims

19 · 2 independent · depth 3

19 granted claims

›1.independentA bituminous paving process, which process comprises:na) mixing an asphalt binder, aggregate and 0.1-1.0 wt % lubricating additive based on the asphal…+15

›2.↳ 1The process of claim 1 wherein the lubricating non-aqueous surfactants comprise i) anionic surfactants comprising saturated fatty acids, unsaturated f…d2+1

›4.↳ 1The process of claim 1 wherein the lubricating non-surfactant additives comprise paraffin waxes, non-paraffin waxes, petroleum, petroleum-derived and …d2

›5.↳ 1The process of claim 1 wherein the lubricating acids comprise lubricating phosphoric acid grades, polyphosphoric acid, superphosphoric acid, or other …d2

›6.↳ 1The process of claim 1 wherein the bituminous mix contains about 0.1-0.4 wt % lubricating additive based on the asphalt binder weight.d2

›7.↳ 1The process of claim 1 wherein the bituminous mix comprises about 1-98 wt % reclaimed asphalt pavement based on the bituminous mix weight.d2

›8.↳ 1The process of claim 1 wherein the bituminous mix comprises about 10-60 wt % reclaimed asphalt pavement based on the bituminous mix weight.d2

›9.↳ 1The process of claim 1 wherein the second temperature is less than about 125° C.d2

›10.↳ 1The process of claim 1 wherein the second temperature is less than 120° C.d2

›11.↳ 1The process of claim 1 wherein the second temperature is less than 100° C.d2

›12.↳ 1The process of claim 1 wherein the first temperature is greater than 170° C.d2

›13.↳ 1The process of claim 1 wherein a blend of the asphalt binder and lubricating additive has a measured maximum normal force no more than about 3 Newtons…d2

›14.↳ 1The process of claim 1 wherein the compacted mix has a field density value greater than 92% of maximum theoretical density.d2

›15.↳ 1The process of claim 1 wherein the compacted mix has a field density value greater than 95% of maximum theoretical density.d2

›19.↳ 1The process of claim 1 comprising mixing an aqueous solution of the lubricating additive with the asphalt binder.d2

›16.independentA bituminous paving process, which process comprises:na) mixing an asphalt binder, aggregate and 0.1-1.0 wt % lubricating additive based on the asphal…+2

Classifications

4 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C08L95/00

USPC · US Patent Classification

106/281.1106/277106/273.1

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Pendency

2.0 y

732 days filing → grant

Office actions

non-final + final

Responses

3 RCE

Examiner

Peter Szekely

art unit 1761 · TC 1700

Law firm

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Citations: 173 back · 0 forward

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Priority chain

2 priority documents

Priority

22 Feb 2008

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 61030750	22 Feb 2008
related publication	US 20120213584 A1	23 Aug 2012

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