◆​​ Modified Asphalt​

 

RPMA stands for Rubber Polymer Modified Asphalt. It is a Pre-Mix type modified asphalt product which is

produced through the long-term physicochemical process in which polymer SBS(synthetic rubber) is mixed 

with straight asphalt and special catalyst at high temperature using a high shearing homogenizer mixer.​

 

 

◆​ Features of RPMA products

 

Classification​	General Asphalt​​		RPMA(Modified Asphalt​) Products​
Manufacturing methods​	Vacuum distillation​	Straight Asphalt​​	GeneralAsphalt + modifier (Physio-chemical reactions)	Pre-Mix type modified Special asphalt
	Air Blowing	Semi Blowing Asphalt
	Blending	Blending Asphalt
Properties and Characteristics​	Low high-temp​ Viscosity​	Plastic deformation​	Increasingviscosity​	Reinforcement of resistance against plastic deformation​
	High high-temp​ Viscosity​	Low-temperature cracks​​	Increasing flexibility​	Enhancement of resistance against low-temp cracks​​
	Low elasticity​	Fatigue cracks​​	Increasing elasticity​	Shock absorption. Prevention of fatigue cracks​​
	Low adhesion	Aggregate separation​	Reinforcing adhesion​	Adherence to aggregate. Prevention of separation​
	Weak weather resistance​	Shortened ​life​​	Reinforcing weather resistance​	Increasing life of pavement​

 

Key Point

The product extends the life of pavement and provides comfortable and safe road, because physical and chemical properties of asphalt(viscosity, elasticity, adhesion, stability, flexibility, etc.) are greatly improved by adding a high-temperature modifier (SBS) to efficiently prevent weaknesses of straight asphalt (AP-5) pavement such as plastic deformation(rutting) in high-temperature, cracks in low-temperature and fatigue cracks on the road.​  

 

◆​​ Quality of mixtures according to pavement specifications​

◆​​ Modified SMA(RPMA 70-22/ 76-22/ 82-22)​

 

 

 

 

Advantages​	Major use​
1. Minimized for plastic deformation(rutting), cracking and raveling.   2. Increased skid-resistance due to the rough surface. Decreased Noise-reduction in a traffic.   3. Decreased for hydroplaning caused by skid- vehicle when it traveling during rainy weather.	1. Medium traffic roads (Industrial and highway) 2. Liquidity demanded roads.

◆ Modified Asphalt - Fluidity (RPMA 70-22/ 76-22)

The product extends the life of pavement and provides comfortable and safe road, because physical and

chemical properties of asphalt ( viscosity, elasticity, adhesion, stability, flexibility, etc. ) are greatly improved

by adding natural rubber powder ( crumb rubber ) and highly polymerized chemical substance( polymer ) to

efficiently prevent weaknesses of straight asphalt (AP-3/5) pavement such as summer plastic deformation,

winter low-temperature cracking, and shock fatigue cracking.

 

Advantages​	Major use​
1. Minimized for plastic deformation(rutting), cracking and raveling on the road.   2. Increased for skid-resistance on the road caused by rough surface. Decreased noise-reduction during vehicle driving.   3. Decreased for hydroplaning caused by skid vehicle during rainy weather.	1.Medium traffic roads(Industrial and highway)   2.Bridges, overpasses, inside tunnels.    3.Bicycling lanes.   4.Liquidity demanded roads such as airfield runway.

 

 

 

◆​​ Low noise Drainage (RPMA 82-22)​

 

 

 

Advantages

Major use​

1. Drainage function: Prevented splashing and hydro-planing, prevented suppress diffused reflection at night and rainy day, improved cognitive performance for visual indication of water when it rains the road.   2. Reduction of Noise: Absorbed noise generation between tires and surfaces of large gaps on the road, improved living condition with low noises around the road.   3. Skid-resistance: Prevented traffic accidents caused by skid vehicle with having excellent drainage effects.

1. Road hydroplaning and splashing happened caused by water stagnant when it rains   2. Road required to increase skid resistance because of high risks of traffic accidents   3. Places required to reduce traffic noises of the road around homes and schools.   4. Road required durability of the pavement with excellent fluidity and cracking resistance

 

 

◆​​ Low Noise Fluidity (RPMA 82-22)​

 

Asphalt for low noise pavement is the product which improves the adhesion to aggregates and enhances weather and water resistance by adding polymer with high viscosity, because asphalt mixture is designed   to reduce noises through pavement of the surface layer with porosity of 8~15 % for the purpose to reduce noise occurring when the vehicles are running. 

 

 

Advantages​	Major use​
1. Reduction of noise: Absorbed noise that occurred between vehicles tires and road surface, also improved living environment with low-noise around the road. 2. Other functions: Excellent effected plastic deformation resistance, excellent prevented low-temperature cracking with excellent flexibility, improved in skid resistance (prevented of traffic accidents with skid resistance when it rains.)	1. Places required to reduce traffic noises because apartment complex, houses and schools are located around the road.   2. Road required to increase skid resistance because of high risks of traffic accidents.   3. Road requiring durability of the pavement with excellent semi-rigidity and cracking resistanc.