SIS-Modified Asphalt Concrete for Water Impermeability and Rutting Resistance
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Solution Overview
Problem
Existing asphalt pavements face issues such as low softening point, high temperature sensitivity, weak weather resistance, and cohesive strength, leading to cracking, rutting, and inadequate durability, especially under heavy traffic and severe temperature fluctuations, while conventional waterproofing methods are costly and lack structural performance.
Innovation Solution
A water-impermeable waterproof asphalt concrete composition comprising styrene isoprene styrene (SIS), petroleum resin, aggregate, fine powder aggregate, and bio-resin, combined with a specific mixing/feeding system for constructing integrated pavement, enhancing elasticity, toughness, and adhesion to create a durable and water-resistant surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If straight asphalt is used for road pavement, then excellent adhesion and water impermeability are achieved, but low softening point and high temperature sensitivity cause cracking and rutting
Solution Approach 1:
The patent uses a composite binder system combining modified asphalt (with polymers like SBS or SBR) and cementitious materials (Portland cement or fly ash). This composite approach integrates the adhesion and water impermeability of asphalt with the high temperature resistance and structural strength of cement, resolving the contradiction between low softening point and excellent adhesion.
2Temperature
If asphalt modifiers are added to improve high temperature performance, then softening point increases, but low temperature cracking resistance and fatigue cracking resistance decrease
Solution Approach 1:
The patent optimizes the dosage of modifiers and cementitious materials to achieve balanced performance. By controlling the proportion of polymer-modified asphalt (5-20% by weight) and cement (10-30% by weight), the composition achieves both high temperature resistance (increased softening point) and low temperature cracking resistance through proper parameter optimization.
Solution Approach 2:
The composite binder system combines polymer-modified asphalt with cementitious materials, where the cement component provides structural integrity and cracking resistance that compensates for the brittleness introduced by asphalt modifiers, while the modified asphalt maintains adhesion and flexibility.
3Reliability
If conventional waterproofing methods are applied, then waterproof performance is improved, but cost increases and structural performance is not enhanced
Solution Approach 1:
The patent creates a multi-functional pavement layer that simultaneously provides structural support, waterproofing, and temperature resistance. The composite binder system with cementitious materials and modified asphalt integrates multiple functions into a single material system, eliminating the need for separate waterproofing layers and reducing overall cost while enhancing structural performance.
Solution Approach 2:
The patent merges the waterproofing function with the structural pavement layer by incorporating cementitious materials and modified asphalt in a composite binder system. This integration eliminates the need for separate waterproofing membranes or coatings, reducing cost and improving structural performance simultaneously.
Data Source
AI summary
A water-impermeable waterproof asphalt concrete composition having styrene isoprene styrene (SIS). The composition's waterproof performance due to its high cohesion and adhesion. The composition is durable and is not easily rutted, aged and/or stripped. In addition, the composition has a performance grade of PG 82-34, and can prevent water penetration and potholes. Furthermore, the asphalt concrete for prime coating and waterproof asphalt concrete can be applied to form an integrated structure by using a mixing/feeding system and can also be easily placed on site.