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Inquiring about Bitumen

03/10/2015 2:32 AM

I have a quation about a ductility for Asphalt :-

How we can increase the ductility if anyone has a way and info please let me know ASAP , To get the good specifection for Bitumen .

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#1

Re: Inquiring about Bitumen

03/10/2015 2:42 AM
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#2

Re: Inquiring about Bitumen

03/10/2015 2:57 AM

Putting a time line on a fundamental question has never yielded good results.

What is it with as soon as possible? Are you in a hurry?

Too bad. There seems not even to be time for a quick internet research it seems.

Sorry cant suite your time line. Probably too late already, street build and falling apart.

Good luck then!

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#6
In reply to #2

Re: Inquiring about Bitumen

03/10/2015 3:27 PM

"ASAP" actually means "low priority". New Year's Day 2045 is possible, for example.

If a task is labelled "as soon as possible" in Microsoft Project and there are other tasks with start dates or end dates, Project puts the ASAP task at the end.

At least if there was a target date on a project one could decline on the basis of no time being available before that date, and invite the punter to take the business elsewhere.

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#3

Re: Inquiring about Bitumen

03/10/2015 6:31 AM

You could try warming it up.

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#8
In reply to #3

Re: Inquiring about Bitumen

03/10/2015 9:27 PM

About the simplest practical way I can think of also.

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#4

Re: Inquiring about Bitumen

03/10/2015 8:54 AM

Maybe add a lighter hydrocarbon like kerosene.

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#13
In reply to #4

Re: Inquiring about Bitumen

08/29/2017 2:26 PM

Not so fast, please! Addition of "ligher" hydrocarbons can be tricky, as compatibility has to be checked throughly. How "light is light? Too light the solvent, and it will reduce the viscosity but the vapor pressure will be too high, resulting in a too brief dilution. As soon as the solvent evaporates, contraction will take place and mixture can develop cracks. Too heavy the solvent would require too much volume to get the thinning effect, which too produces a large evaporated fraction.

Thus, solvent moleculatr weight and quantity, must be carefully chosen and tested before going into the mix.

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#5

Re: Inquiring about Bitumen

03/10/2015 9:44 AM

Ductility is a measure of how a material deforms under tensile strength. Asphalt/Bitumen combined with rock aggregate have a very good compression strength. This makes it a good road building material. The rock material is glued together with asphalt. The very low ductility of this mix eases the installation process along with making some small level of self repair, mostly during installation, possible. If you will be putting asphalt under tension and plan on getting it to hold you are using the wrong material.

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#7

Re: Inquiring about Bitumen

03/10/2015 3:34 PM

ASAP, consult your local transportation authority.

They will have good specs.

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#9

Re: Inquiring about Bitumen

03/10/2015 10:57 PM

I have no personal experience but a local rubber reclaim facility told me that using reclaimed rubber from tires in asphalt provided a much longer life and he had the test patches to prove it. Apparently there is a reluctance to use this product in road building material as the life of the road it too long for the contractors that get to grind off a 2-3 inch layer and replace with new 2-3 inch layer on a regular basis. I tend to believe him in this appraisal of the situation.

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#10

Re: Inquiring about Bitumen

03/11/2015 3:03 AM

Rixter is right. From the wikipedia article:

"A number of technologies allow asphalt/bitumen to be mixed at much lower temperatures. These involve mixing with petroleum solvents to form "cutbacks" with reduced melting point, or mixtures with water to turn the asphalt/bitumen into an emulsion. Asphalt emulsions contain up to 70% asphalt/bitumen and typically less than 1.5% chemical additives. There are two main types of emulsions with different affinity for aggregates, cationic and anionic."

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#11

Re: Inquiring about Bitumen

03/11/2015 5:00 AM

The addition of polymer to bitumen changes the ductility without changing the viscosity. Either SBS (styrene) or APP (polypropylene) but not both together or the batch will go solid in the mixer. Ground up rubber is generally used as a filler in place of calcium carbonate (chalk). It does improve durability on roads but is not widely used because road plainings cannot be easily be recycled with rubber added so the whole life cost is greater using rubber with a long duration between resurfacing than no rubber and shorter times between resurfacing. (the comment about contractors not doing this to get more regular work is rubbish, they have no say in what they lay.) Viscosity during installation is usually controlled by temperature. Adding solvents changes the characteristics while laying but as the solvents evaporate the properties of the laid material revert to the same as no solvents added. There are studies to suggest that other factors like UV resistance are adversely affected by the addition of solvents but the evidence is inconclusive at present. Bitumen emulsions are normally used for spraying the surface to get a new layer to bond to the old layer. They have no place in asphalt chemistry.

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#12

Re: Inquiring about Bitumen

03/25/2015 12:12 PM

Aboosh: The real question: "Who's Asphalt is this?" If there are several engineers standing around complaining and griping, the collective term is Bitumen (you already know how to pronounce). If there is only one engineer complaining it is a singularity event, and the singular term is Bituman (you may infer the pronounciation).

Either heat up this Asphalt, add polymer, water emulsify, or add heavy solvent (hopefully to evaporate later, and generally pollute the air???) It all depends on what you want this Bitumen to do later, after it (they) stop complaining.

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