Sustainable road construction with B2Last^®

You are looking for both a sustainable and high performing bitumen additive? BASF developed an intelligent and innovative bitumen modification that helps you to significantly reduce CO₂ and bitumen emissions and makes roads more durable.

Be it an increasing heavy load traffic or more extreme weather conditions because of climate change - today, roads and streets must fulfill different requirements. Additives for bitumen play a decisive role in the durability of asphalt. At the same time, occupational health and safety, environmental protection and the reduction of CO₂ emissions are of high importance for road construction.

With B2Last^®, BASF has developed an innovative bitumen additive that combines both asphalt performance and sustainability: temperature-reduced paving with a high recycled asphalt content and good workability, significantly lower bitumen and CO₂ emissions and longer lasting roads. B2Last^® is the bitumen additive for sustainable road construction.

Your benefits at a glance

Reduced CO₂-emissions along production process – 30-40 °C lower asphalt mix production and laydown temperatures (warm mix asphalt)
Occupational health and safety - B2Last^®makes work safer, bitumen emissions below 1,5 mg/m³ achievable
Saving primary resources – enables high contents of reclaimed asphalt at an excellent workability of the asphalt mix, also at reduced laydown temperatures

Fast & easy asphalt modification directly at mix plant.
Saves bitumen silo capacity
Lower storage temperature for bitumen possible
Easy product storage and dosage

Only 2-3 % additive needed
High flexibility - asphalt performance on demand
Simple adjustment of performance by additive amount
Plant capacity is maintained

Enables 30-40°C lower asphalt laydown temperatures
Makes work safer - up to 65 % less bitumen emissions
Allows high recycled asphalt contents
and maintains excellent workability

Reduces CO₂ emissions along whole process chain
Superior rutting behavior and fatigue resistance across broad temperature range
Makes roads last longer

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Environment Health and Safety

Bitumen aerosols and vapors (bitumen emissions)
B2Last^® enables asphalt mix production and laydown temperatures below 140 °C (warm mix asphalt) and thereby reduces bitumen aerosols and vapors by up to 65% (depending on measuring point) – for workers walking beside the paver the occupational exposure limit of 1.5 mg/m³ can be fulfilled.

Product Safety
We value the health and safety of people above all else – introduction to product handling and emission monitoring with customers at every plant trial. Several large scale paving trials and more than 12 km paved roads confirm: B2Last^®-related emission levels are far below occupational exposure limits.

Our solution for sustainable road construction

Reduced asphalt mix production and laydown temperatures at still high reclaimed asphalt ratios while maintaining asphalt performance and its excellent workability
Less energy needed for heating bitumen, aggregates and reclaimed asphalt
Occupational health & safety – less bitumen emissions, B2Last^® makes work safer
Enables high reclaimed asphalt ratios – saving primary resources
Increased road life time – excellent rutting behavior and fatigue resistance across broad temperature range

How B2Last^® works

B2Last^® crosslinks bitumen components to form a polymeric network. It makes asphalt stiffer and thereby boosts the rutting and fatigue behavior at high service temperatures. In addition, the formed polymeric network provides enough elasticity to deliver excellent crack resistance at low service temperatures.

Interaction with paving grade bitumen

B2Last^® reacts with bitumen components and forms a strong elastic polymer network

B2Last^® becomes part of the polymeric network and is fully consumed during the crosslinking reaction

Interaction with reclaimed asphalt (RA) bitumen (aged)

B2Last^® reactively crosslinks virgin bitumen and aged RA-bitumen

Components of aged RA-bitumen have more functional groups which serve as anchors for B2Last^®

The interconnectivity provides an excellent asphalt mix workability and allows the use of high RA contents

Our know-how and services for you

As a leading chemical company, BASF has the expertise and experience to improve the quality and processing of bitumen and asphalt in a unique, innovative and customer-oriented way.

Asphalt laboratories and partnerships

BASF has profound asphalt know-how around the globe and asphalt labs in North America and Europe.

BASF has global partnerships in academia and the asphalt industry.

Technical service teams

We support our customers with B2Last^®-related plant modifications and implementations.

Our teams make B2Last^®-plant trials happen with a customized mobile dosing unit. Just contact us.

Succesful pilot

The new additive has already been tested under real life conditions: over 12 kilometers of public road have been paved in Bavaria and North Rhine-Westphalia in Germany and Kentucky in the United States. The modified asphalt has displayed excellent characteristics during both mixing and application.

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Mixture loading at asphalt mixing plant.

Pilot asphalting with B2Last^® modified asphalt mixture.

B2Last - Asphaltierung der PWC-Anlage A96

Pilot asphalting with B2Last^® modified asphalt mixture.

Applications

Installations and our support

Asphalt mixing plants may already be capable of applying B2Last^® after only slight plant adjustments. We support our customers with plant analyses (B2Last^® compatibility), concepts for retrofit and plant trials. Get in touch with us!

Application example – dosing & mixing inside bitumen balance

Technical Data

Request product data sheet at B2Last@basf.com

Sustainable road construction with B2Last®