BNA Blend

BNA BLEND (Buton Natural Asphalt) is a modified asphalt product resulting from Buton Asphalt mixture which is processed under Semi-Extraction method and Oil Asphalt in specific composition thus having the following benefits:

1. High Adhesiveness / Water Resistance

   Water always brings negative impact on asphalted-road reinforcement. Water stripping will weaken asphalt-aggregate bond, which results in raveling, pot hole and structural weakening.

   Boling Test (ASTM 3625) indicates that BNA Blend has high water stripping resistance, thus highly potential for improving the quality of road network.

   
   ASTM D 3625 - Modified (Proposal By Satker Balai IV – pH : 6)

2. High Stiffness Modulus

   DSR (Dynamic Shear Rheometer) test shows that asphalt modulus (G*/Sin d) = 1kPa is reached at 72oC. This indicates that in PG Grading classification, BNA Blend may be categorized into Asphalt PG-70, two grades above Oil Asphalt Pen 60/70 in general. The confirmation of high modulus of BNA Blend is also proven by the result of wheel tracking test, which is far higher than Oil Asphalt.

   

   In such high dynamic stability, BNA Blend is suitable to apply on heavy-traffic roads

3. High Softening Point

   Softening Point of BNA Blend is 55oC, higher than Standard Asphalt; it may, therefore, be applied to resolve the problems in connection with high temperature, such as Bleeding, Rutting & Shouving.

4. Crack Resistance

   The experimentation of BNA Blend Hot Mix spreading on the cracked road shows that neither Reflecting Cracking nor Pot Hole emerges after 3.5 years of operation.

   Before: BNA Blend is spread on the cracked existing condition without being milled (+/- 2 m)

5. Workable

   BNA Blend application process as from mixture to compaction is as easy as Oil Asphalt application.*

   *With higher temperature application

6. Economic & Long Life

   With such aforesaid benefits, BNA Blend becomes an economic product due to its higher damage resistance if compared with Oil Asphalt and other Buton Asphalts.

BNA BLEND HAS COMPLIED WITH SPECIFICATION OF HIGHWAYS

Parameter	Oil Asphalt (Pen 60/70)	BNA	BNA BLEND*	Highways 2012 Modified Natural Asphalt)
Penetration @25C,dmm	66	3	55	40-55
Softening Point, C	48	105	55
Ductility, Cm	140	1	>140	Min 100
Solubility – TCE,% - W	99.9	58.1	90	Min 90
Flash Point, C		250	284	Min 225
Specific Gravity	1.03	1.496	1.032	Min 1.0
Weight Loss, %		0.072	0.224	Max 2.0
Pen after LOH, %		33	81,7	Min 55
Ductility after LOH		0.5	108	Min 50
Mixing Temp., C			170
Compacting Temp., C			150

*)Test Result of Research and Development Center (Puslitbang) of Roads & Bridges, July 2012

Ratio of BNA and Other Buton Asphalts

Properties	Conventional Buton Asphalt	BNA
Bitumen, % Mineral, %	18-20 80-82	55-60 40-45
Bitumen Mobilization Substitution Ratio on mixed doses	80 % <16 %	100 % 60 %
Mixed Workability.	-	Good
Doses of Buton Asphalt Resource Usage	Smaller	Bigger

Liquid BNA Blend is distributed by using tanker in temperature ranging from 120°C to 140°C, at which the mixer continues to operate.

BNA Blend Application:

1. VTO (Very Thin Overlay)

   May be used as thin overlay on either rigid or flexible with < 2.5 cm in thickness.

2. SMA (Gap Graded)

   Cirebon Airport Runway applies SMA (Gap Graded)

3. Dense Graded

   Applied in Roads in Madura and Nagrek

4. Porous

5. Chip Seal

BNA Blend Temperature in AMP

No	Activity	Temperatur °C
1	BNA Blend Heating during mixing	160-170
2	Mixture of testing object of Marshall	160
3	Compaction of testing object of Marshall	150
4	Mixing temperature in AMP	170-180
5	Mixing, targeted temperature span	165-170
6	Pouring asphalted mixture from mixer to transporter	160-165
7	Supplier to Spreader	150-160
8	Initial Compaction (Steel Wheel)	130-150
9	Main Compaction (Rubber Wheel)	95-130
10	Final Compaction (Steel Wheel)	70-95

We also Provide ASPHALT PEN 60/70

Commonly applied asphalt in Indonesia, which has complied with specification from Highways.