Asphalt Mixture with Reactive Additives for Rapid Strength

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Solution Overview

Problem

Existing asphalt mixtures struggle to develop strength quickly and maintain durability and flexibility under low to warm temperature conditions, especially when constructed at ordinary or warm temperatures, leading to potential deterioration and extended curing times.

Innovation Solution

An asphalt mixture comprising an aggregate, asphalt, a lubricative solidification material with linolenic acid at 1-15 wt%, and an alkaline additive, which undergoes saponification or neutralization reactions upon addition of a hardening accelerator to enhance viscosity and strength, allowing construction and compaction within a wide temperature range (-20° C. to 120° C.).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hot asphalt mixture is used to ensure sufficient strength immediately after paving, then the initial strength is improved, but the available period of time for construction is limited due to rapid temperature decrease

Engineering Contradiction:

Improveinitial strengthVSAvoidavailable period of time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The patent changes the chemical composition parameters of the asphalt mixture by incorporating specific additives (cutback material, reactive aggregate, polymer modifier) to alter the temperature-strength relationship. This allows the mixture to maintain workability at lower temperatures while achieving sufficient strength through chemical reactions rather than relying solely on thermal energy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite asphalt mixture system combining multiple components: base asphalt, cutback material (mineral oil or water), reactive aggregate (containing calcium oxide, calcium hydroxide, or other reactive compounds), and polymer modifiers. These components work synergistically to provide both low-temperature workability and rapid strength development through chemical reactions between the reactive aggregate and asphalt binder.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If a cutback asphalt mixture is used to enable construction under ordinary temperatures, then the viscosity is reduced for easier construction, but the mixture strength deteriorates and curing time increases

Engineering Contradiction:

Improveconstruction easeVSAvoidmixture strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent incorporates reactive aggregates (containing calcium oxide, calcium hydroxide, or other reactive compounds) into the asphalt mixture before construction. These reactive components are prepared in advance to react with the asphalt binder after paving, initiating rapid strength development without requiring external additives during the construction process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reactive aggregate acts as an intermediary substance that facilitates the transition from a low-viscosity, easy-to-compact state to a high-strength cured state. The reactive compounds in the aggregate (calcium oxide, calcium hydroxide) mediate the chemical reaction with the asphalt binder and cutback material, enabling rapid strength development while maintaining construction ease.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If an asphalt emulsion is used for ordinary temperature construction, then the aggregate heating requirement is eliminated, but the mixture strength remains relatively low and the application field is limited

Engineering Contradiction:

Improvemanufacturing easeVSAvoidmixture strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent fundamentally changes the chemical parameters of the binder system by replacing traditional asphalt emulsion with a novel composition comprising base asphalt combined with cutback material (mineral oil or water) and reactive aggregate. This chemical parameter change enables the mixture to achieve rapid strength development through chemical reactions while maintaining ease of manufacture and broader applicability across different temperature conditions.

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 asphalt mixture achieves rapid strength development and enhanced durability and flexibility, enabling effective pavement construction across a broader temperature range while maintaining performance characteristics.

Implementation Method 1

a hardening accelerator is fed to the mixture at the time of pavement construction so that the lubricative solidification material and alkaline additive material undergo a saponification reaction or a neutralization reaction to increase the viscosity

Methodology Applied

Scientific EffectSaponification reaction: Hydrolysis

Implementation Method 2

Methodology Applied

Scientific EffectNeutralization reaction: Chemical Bonding

Data Source

PatentUS9617426B1Asphalt mixture, process for production of same, and paving method using same

Publication Date: 2017.04.11 MAEDA ROAD CONSTR CO LTD

AI summary

An asphalt mixture is provided which comprises an aggregate, an asphalt, a lubricative solidification material and an alkaline additive material that are mixed together. The lubricative solidification material contains a palmitic acid at a ratio of 1 to 15 wt %, a stearic acid at a ratio of 0.3 to 10 wt %, an oleic acid at a ratio of 39 to 59 wt %, a linoleic acid at a ratio of 20 to 48 wt %, and a linolenic acid at a ratio of 1 to 15 wt %.