Bio-oil Asphalt Binders Oxidative Aging Resistance

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Solution Overview

Problem

Asphalt pavements face oxidative aging due to environmental factors, leading to brittleness and cracking, with existing antioxidant additives being either ineffective or environmentally harmful, and economically unsustainable.

Innovation Solution

Incorporating bio-oil, derived from fast pyrolysis of biomass, as an antioxidant additive in asphalt binders, which is mixed with asphalt and heated to form a polymerized binder, potentially including tall oil and other additives to enhance performance and longevity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional asphalt binders are used without antioxidant additives, then the production cost is low and the manufacturing process is simple, but the asphalt binder is susceptible to oxidative aging, becoming harder and more brittle over time

Engineering Contradiction:

Improveresistance to oxidative agingVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The bio-oil modifier contains natural phenolic compounds that automatically provide antioxidant protection to the asphalt binder. The phenolic compounds in bio-oil react with free radicals generated during oxidative aging, creating a self-protecting system that eliminates the need for complex external antioxidant additives while maintaining manufacturing simplicity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention changes the chemical composition parameters of the asphalt binder by incorporating bio-oil modifiers containing phenolic compounds. This parameter change transforms the binder's oxidative stability without requiring complex manufacturing processes, as the bio-oil can be directly blended with the asphalt at standard production temperatures

Inventive Principle:

Principle #35Parameter changes

2Reliability

If polymer additives are used to modify asphalt binders, then the binder properties can be adjusted, but the polymers cannot prevent oxidative aging and degradation occurs to the additives themselves

Engineering Contradiction:

Improveprevention of oxidative agingVSAvoidadditive stability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The invention converts the harmful oxidative process into a beneficial effect by using phenolic compounds from bio-oil that preferentially react with oxygen and free radicals. The phenolic hydroxyl groups donate hydrogen atoms to stabilize free radicals, converting the harmful oxidation process into a protective mechanism that prevents degradation of both the asphalt binder and any polymer additives present

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The bio-oil phenolic compounds act as an intermediary substance between the oxygen environment and the asphalt binder polymers. The phenolic compounds intercept oxidative attacks before they can reach and degrade the polymer chains, serving as a protective mediator that stabilizes both the binder and polymer components

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If lead diamyldithiocarbamate (LDADC) is used as an antioxidant additive, then oxidative aging can be inhibited, but the additive contains lead and is environmentally harmful

Engineering Contradiction:

Improveantioxidant effectivenessVSAvoidenvironmental harm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bio-oil phenolic compounds serve as a biodegradable, environmentally friendly alternative to persistent heavy metal antioxidants like LDADC. The phenolic compounds are derived from renewable biomass sources and naturally decompose, providing effective antioxidant protection without creating long-term environmental contamination

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention changes the chemical composition from heavy metal-based antioxidants to organic phenolic compounds from bio-oil. This parameter change maintains antioxidant effectiveness through phenolic hydroxyl groups while eliminating the harmful lead content, transforming the additive from environmentally damaging to environmentally benign

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The bio-oil modified asphalt binders demonstrate improved resistance to oxidative aging, maintaining performance at high temperatures while mitigating low-temperature issues, offering a cost-effective and environmentally friendly solution for extending pavement life.

Implementation Method 1

heating the combination at a temperature of from about 120° C. to about 170° C.

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

which is mixed with asphalt and heated to form a polymerized binder

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentUS9523003B2Asphalt materials containing bio-oil and methods for production thereof

Publication Date: 2016.12.20 IOWA STATE UNIV RES FOUND INC

AI summary

An asphalt binder includes asphalt and an asphalt binder modifier, which includes bio-oil. The asphalt binder can include a carboxyl additive. The asphalt can optionally include polymer-modified asphalt. An asphalt material includes mineral aggregate, an asphalt material binder including asphalt, and an asphalt binder modifier including bio-oil. A method for making the asphalt binder is disclosed. The asphalt material includes asphalt pavement and roofing shingles. The asphalt binder can be emulsified with water and a surfactant for use as a weatherproofing sealant or as an adhesive.