Zeolite Slurry Lowers Asphalt Mix Production Temperature
Solution Overview
Problem
Asphalt concrete pavement production requires high temperatures for workability, leading to high energy costs, and existing Warm Mix Asphalt technologies have limitations in reducing production temperatures and maintaining mix performance.
Innovation Solution
A slurry of water and zeolite, with optional additives, is introduced into the asphalt mix to reduce production temperatures, enhance workability, and allow increased use of recycled materials, while maintaining performance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high temperatures are used for asphalt mix production, then workability and handling are improved, but energy costs increase
Solution Approach 1:
The patent changes the temperature parameter from high (traditional hot mix) to low (warm mix) by introducing zeolite slurry as a chemical additive. The zeolite slurry modifies the asphalt-cement properties to maintain workability at reduced temperatures, directly resolving the contradiction between ease of operation and energy consumption
Solution Approach 2:
The zeolite slurry acts as an intermediary substance that mediates between the asphalt-cement and aggregates. It facilitates the mixing process at lower temperatures by improving dispersion and reducing viscosity, enabling workability without requiring high temperature energy input
2Temperature
If traditional hot mix asphalt is used, then production temperature is high, but existing Warm Mix Asphalt technologies have limitations in reducing production temperatures
Solution Approach 1:
The patent achieves significant temperature reduction (to 110°C or lower) by changing the chemical parameters of the asphalt mix through zeolite slurry addition. The slurry alters the rheological properties and bonding characteristics to maintain mix performance reliability at these reduced temperatures
Solution Approach 2:
The invention creates a composite material system combining zeolite slurry with asphalt-cement and aggregates. This composite approach integrates the water-release properties of zeolite with the binding properties of asphalt to achieve both temperature reduction and performance maintenance
3Use of energy by moving object
If production temperature is reduced, then energy cost decreases, but workability may be compromised
Solution Approach 1:
The zeolite slurry changes the physical-chemical parameters of the asphalt mix, specifically reducing viscosity and improving flow characteristics. This allows the mix to maintain adequate workability (spreading, compacting, and bonding properties) at reduced temperatures, enabling energy cost reduction without sacrificing ease of operation
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 zeolite slurry effectively lowers asphalt mix production temperatures, improves workability, and enables increased use of recycled materials, resulting in significant fuel cost savings and extended paving seasons in various weather conditions.
Implementation Method 1
A slurry of water and zeolite, with optional additives, is introduced into the asphalt mix to reduce production temperatures
Data Source
AI summary
Embodiments provide slurries of water and zeolite. These slurries have beneficial properties when mixed with asphalt. These beneficial properties may include extension of the asphalt as well as a decrease in the temperature used to process the cement. In some embodiments additional additives are included, such as anti-strip amines. Methods of making and using the slurries, as well as cement mixtures incorporating the slurries are also included herein.