Saturday, August 27, 2016
Bitumen seller, bitumen price
Saturday, July 30, 2016
Wednesday, July 13, 2016
Monday, May 2, 2016
Hardening of bitumen in asphalt during hot storage, transport and laying
Drum mixers, which produce
large volume of asphalts, require silo storage for the mixed material to
account for peaks and troughs in demand. In such circumstances, mixtures are
stored in hot silo as well as in the delivery vehicle during transportation.
Some hardening of the bitumen
will take place during hot storage whether it is a silo or in a truck. It was
stated above that the amount of hardening will depend principally upon the
duration of exposure to oxygen, the thickness of the bitumen film and the
temperature of the mixture. When a mixture is discharged into a storage silo,
air enters with the mixture and some is trapped in the voids of the material. During
the storage period, some of the oxygen in this entrained air will react with
the bitumen. If no additional air enters the silo, oxidation of the bitumen
will cease.
It is important that the
entry and discharge gates are airtight and that there are no other openings
where air can enter the silo. If the discharge gate is not airtight the silo
may behave like a chimney drawing air in at the discharge gate (which exits the
loading gate) resulting in oxidation and cooling of the stored material. In addition,
the silo should be as full as practicable in order to minimize the amount of
free air at the top of the silo. Air remaining at the top of the silo will
react with the top surface of the material. This reaction forms carbon dioxide
that, because it is heavier than air, tends to blanket the surface of the
mixture protecting it from further oxidation. In the USA, some silos have the
facility to be pressurized with exhaust gases, containing no oxygen, from a
burner. These exhaust gases purge the silo of entrained air and provide a
slight positive pressure preventing more air entering the silo.
Studies carried out in the USA
suggest that if oxidation in the silo is limited to that induced by entrained
air then little or no additional oxidation will occur during transportation and
laying. It is hypothesized that this is because no significant quantity of
fresh air is entrained in the mixture during discharge into the truck. Thus, little
or no additional air is available for oxidation. In fact, it was observed that
if the mixture was discharged directly from the pugmill into the delivery
vehicle, the amount of hardening during transportation was very similar to that
which occurs during silo storage.
If materials are being laid
at low ambient temperatures or if the mixture has to be retained for a period
in hot storage, there is a temptation to increase mixing temperatures to offset
these two factors. However, increasing the mixing temperature will be lost because
of additional oxidation of the bitumen which may adversely affect the long-term
performance of the material.
Monday, April 11, 2016
Saturday, March 12, 2016
Tuesday, February 16, 2016
Bitumen 60/70 Prijslijst 2016
Iraanse # raffinaderijen produceren # Bitumen60 / 70, Bitumen 80/100, 85/100 Bitumen en bij gelegenheid, andere vormen van bitumen.Bitumen kopers zijn op zoek naar een recente bitumen # price_list elke dag. Als u een van hen bent kunt u contact met ons op Feedar Group via e-mail of via de optie op deze site contact. U kunt uw aanvraag indienen en The Feedar Group zal antwoorden zo spoedig mogelijk.
De Feedar Group is een internationale groep die vele kwaliteiten van bitumen alle van de wereld levert. De Feedar Group kan Bitumen 60/70, Bitumen 80/100, 85/100 Bitumen, Bitumen 40/50 en ga zo maar door te leveren. Bij De plant Feedar Group kunnen we Bitumen verpakken in nieuwe stalen vaten, plastic zakken, jumbo zakken en andere mogelijke verpakkingen. De middelen van de verpakking is gebaseerd op verzoek van de klant. Als u meer wilt weten over de beschikbare middelen van de verpakking in onze fabriek kunt u weet dat deze link te bezoeken of u kunt contact met ons opnemen via e-mail of het contactformulier optie hier beschikbaar.
Feedar Group probeert zijn bitumen uit de beste Iraanse raffinaderijen te leveren aan haar klanten, samen met de beste kwaliteit en prijs. Klanten Feedar Group in staat zal zijn om het bitumen prijzen via e-mail of per telefoon weten.
De Feedar Group heeft haar eigen # drum productie-fabriek in de naam van Feedar Esfahan die verschillende soorten van nieuwe stalen vaten produceert met vele soorten en capaciteiten zoals 231kg drums voor bitumen, 192 kg drums voor bitumen en 158 kg vaten voor bitumen.Feedar Esfahan fabriek maakt gebruik van de beste grondstoffen om nieuwe stalen vaten met de beste kwaliteit te produceren. Als u meer informatie over bitumen drums nodig hebt kun je deze link bezoekenwaarin je in staat om onze producten te vergelijken zal zijn.
De E-mail van de Feedar Group is info@feedar.co. Vriendelijk voel je vrij om contact met ons op elk gewenst moment.
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