Geopolymer Coating for Building Components
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Solution Overview
Problem
Current fire- and heat-resistant materials for building construction, such as intumescent coatings and spray-on mineral fibre coatings, face limitations including early structural weakening due to heat, moisture susceptibility, and environmental impact, while traditional mortars like OPC are labour-intensive and environmentally unfavourable.
Innovation Solution
The use of geopolymers as coatings and mortars, which provide high-temperature resistance up to 1200°C, are resistant to moisture, and have a lower environmental impact, with geopolymer foams allowing for efficient application and curing to form a strong, aesthetically pleasing, and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If intumescent coatings are used for fire protection, then the coating expands to form a foam that chars and retards heat transfer, but the coated component warms considerably towards the temperature at which it loses structural strength before the intumescent coating becomes effective
Solution Approach 1:
The geopolymer coating is applied in advance to the component surface before fire exposure occurs. This preliminary application ensures that the protective layer is already in place and will immediately begin functioning when fire occurs, eliminating the delay experienced by intumescent coatings that must first expand and char before providing protection.
Solution Approach 2:
The invention changes the material parameter from intumescent materials to geopolymer materials, which have fundamentally different thermal response characteristics. Geopolymers maintain structural integrity at high temperatures without requiring phase change or expansion, providing immediate protection rather than delayed protection through chemical transformation.
2Reliability
If spray-on mineral fibre coatings are used for structural steel protection, then the steel is protected from the outset of a fire, but the fibres are bound with a water soluble binder that washes off in rain and separates from the steel component in case of leaks
Solution Approach 1:
The invention changes the binder material parameter from water-soluble binder to geopolymer material. Geopolymers are inherently water-resistant and maintain their binding properties in moist environments, eliminating the stability issues associated with water-soluble binders while maintaining fire protection reliability.
3Quantity of substance
If ordinary Portland cement based foam is sprayed on for protection, then the approach is low cost, but it is not as thermally insulative as other methods and will deteriorate rapidly in a developed fire by spalling
Solution Approach 1:
The invention uses geopolymer materials which combine the advantages of different material systems. Geopolymers provide both thermal insulation properties superior to OPC foam and fire resistance without spalling, while maintaining cost-effectiveness through efficient material usage and application methods.
4Reliability
If OPC is used as a mortar for binding bricks, then it is a favoured material in the construction industry, but it needs to be manually applied using a tool such as a trowel which is labour-intensive and inefficient
Solution Approach 1:
The invention employs spray application technology to apply the geopolymer mortar mixture. This pneumatic/hydraulic application method replaces manual trowel application, significantly increasing productivity and application efficiency while maintaining reliable bonding performance through consistent material distribution and curing properties.
5Ease of manufacture
If OPC is used as a mortar, then it provides binding functionality, but it comprises ingredients whose manufacture generates substantial amounts of environmentally-unfriendly carbon dioxide gas
Solution Approach 1:
The invention changes the chemical composition parameter from OPC-based materials to geopolymer materials. Geopolymers are produced through a different chemical process that generates substantially less CO2 emissions during manufacturing, while maintaining equivalent or superior binding functionality through geopolymerization reactions.
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
Geopolymers retain structural integrity longer during fires, reduce material usage, and offer a more efficient and environmentally friendly alternative to traditional materials, enhancing building safety and reducing environmental footprint.
Implementation Method 1
the geopolymer according to the present invention may withstand temperatures over 1000° C., and may even withstand temperatures up to 1200° C. whilst still maintaining structural integrity
Implementation Method 2
An intumescent material is a material that expands to form a foam upon exposure to heat (e.g., from a fire) due to the presence of a heat-activated blowing (foaming) agent present in the material
Data Source
AI summary
Use of a geopolymer in a coating composition for a building construction component, a coated component for use in building construction wherein the coating comprises a geopolymer, a method of coating a component comprising applying a curable geopolymer mixture to a surface of the component and curing the mixture to form a cured geopolymer coating, and the use of a geopolymer as a mortar.