Chemical Fixing System with Superabsorbent Polymers
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Solution Overview
Problem
Chemical fastening systems in moist anchoring grounds face performance reduction due to moisture and residual contamination, which complicates borehole cleaning and results in reduced adhesion and permissible loads.
Innovation Solution
Incorporating superabsorbent polymers (SAP) in the chemical fastening system, which absorb water and swell, enhancing adhesion and cohesion by interacting with the borehole surface and compensating for poor cleaning conditions, combined with a two- or multi-component system comprising a curable resin mixture and a hardener, and using a device with spatially separated components for controlled mixing and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical fastening systems are used in moist anchoring grounds, then the system can be applied without special preparation, but the adhesion performance and permissible loads are significantly reduced due to moisture and contamination
Solution Approach 1:
Superabsorbent polymers (SAP) are introduced as an intermediary substance between the chemical fastening system and the moist borehole environment. The SAP particles absorb excess moisture and form a protective interface that prevents water and contaminants from interfering with the adhesion between the fastening compound and the borehole wall, thereby maintaining reliable bonding performance in humid conditions
Solution Approach 2:
The invention modifies the chemical composition parameters of the fastening system by incorporating SAP particles at specific concentrations (0.001-70% by weight). This parameter change alters the system's interaction with moisture, transforming it from a moisture-sensitive conventional system to a moisture-tolerant system that maintains adhesion performance even in poorly cleaned or wet boreholes
2Reliability
If thorough borehole cleaning is performed to remove drilling dust and moisture, then adhesion performance is improved, but the complexity and time of the installation process increase
Solution Approach 1:
The superabsorbent polymers in the fastening system perform self-service by automatically absorbing moisture and compensating for inadequate borehole cleaning. The SAP particles act autonomously to create optimal bonding conditions without requiring external intervention or complex cleaning procedures, thereby simplifying the installation process while maintaining adhesion performance
Solution Approach 2:
The SAP particles are pre-incorporated into the fastening compound before application. This preliminary incorporation ensures that the moisture-absorbing capability is already present in the system, eliminating the need for separate preliminary cleaning actions and allowing the fastening system to self-correct for inadequate borehole preparation
3Reliability
If superabsorbent polymers are added to the chemical fastening system, then adhesion and cohesion are enhanced in moist conditions, but the composition complexity of the fastening system increases
Solution Approach 1:
The invention creates a composite fastening system by combining conventional chemical fastening compounds with superabsorbent polymer particles. This composite material integrates the bonding functionality of the chemical system with the moisture-management capabilities of SAP, achieving enhanced adhesion in moist conditions while maintaining a relatively simple overall composition that can be produced and applied using existing infrastructure
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 addition of SAP significantly increases the performance of chemical fastening systems in moist conditions by improving adhesion and cohesion, leading to higher adhesion failure loads even in poorly cleaned or wet boreholes, as demonstrated by increased adhesion failure loads in comparative tests.
Implementation Method 1
Superabsorbent polymers are characterized by their ability to absorb at least their own weight, but sometimes over 1000 times their own weight, of water or aqueous solution
Implementation Method 2
thereby swelling accordingly and forming a hydrogel
Implementation Method 3
The function of these systems is based on the one hand on the wetting and adhesion between the anchoring base and the fastening compound
Implementation Method 4
The chemical fastening system can consist of a wide variety of polymer-forming components, which can also be hardened using different reaction mechanisms
Data Source
AI summary
The invention relates to a two- or multi-component chemical fixing system for embedding fasteners in holes or crevices. To improve the holding power of such fixing systems, the invention proposes that at least one first component includes superabsorbent polymers (SAPs).