Factors affecting bitumen chemistry
Long-term studies show that the presence of oxygen, ultraviolet rays and temperature changes affect bitumen, like other organic matter.
These external factors harden the bitumen and reduce the degree of penetration, increase the softening point and typically increase the penetration index (PI).
Recent research has shown that the hardening of bitumen and consequently the asphalt mixture made from it, is effective in road construction, because as the stiffness increases, the load distribution capacity of asphalt layers increases.
This type of hardening is known as curing and is believed to increase the life of the asphalt coating.
In the case of the pavement layer, due to the contact of bitumen with environmental factors, hardening of bitumen has a destructive effect on the performance of bitumen and causes cracking.
Causes of bitumen hardening:
oxidation
Evaporation of volatiles
Steric or physical factors
Leaking oils
Oxidation changes the chemical composition of bitumen.
Like other organic materials, bitumen oxidizes slowly in the presence of oxygen in the air.
And increases the viscosity of bitumen.
Calcium hydroxide prevents asphalt from aging, but the reason for this inhibition has not yet been determined.
In addition, calcium hydroxide is used to improve the adhesion properties of bitumen.
Sodium hydroxide also prevents bitumen aging, but often has a negative effect on bitumen adhesion.
http://www.jeyoil.com/en/page/iran-high-quality-bitumen
➡️➡️ http://jeyoil.com/en/home
#Iran_high_quality_bitumen
#Iran_bitumen
#Iran_bitumen_drum
#Iran_bitumen_bag
#Bitumen_refinery
#Main_bitumen_producer_in_iran
#Bitumen_product_in_iran
#Bitumen_price_in_iran
#Iran_Bitumen
#Drum
#JeyOil
#Jey_Oil
#Jey_Oil_Refining_CO
#w_jeyoil_ads
#شرکت_پالایش_نفت_جی
#بزرگترین_واحد_تولید_کننده_قیر_در_خاورمیانه
➡️➡️ http://jeyoil.com/en/home