Acid-Modified Fly Ash Phase-Change Foamed Concrete for Insulation
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Solution Overview
Problem
Existing phase-change concrete materials face high thermal conductivity, high cost, and low structural stability, limiting their widespread application in building insulation.
Innovation Solution
A phase-change heat-storage foamed concrete is developed using acid-modified fly ash to support paraffin, combined with cement, water, and other additives, achieving a porous and lightweight structure with improved heat-absorbing capability and reduced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene oxide or hydrophobic gas-phase silicon dioxide is used to support phase-change materials, then thermal stability and heat-absorbing capability are improved, but production cost increases significantly
Solution Approach 1:
The patent replaces expensive graphene oxide and hydrophobic gas-phase silicon dioxide with acid-modified fly ash, which is a low-cost industrial waste material. This substitution maintains the supporting function for phase-change materials while dramatically reducing production costs, making the phase-change concrete economically viable for large-scale construction applications.
Solution Approach 2:
The patent modifies the surface properties of fly ash through acid treatment to create appropriate surface characteristics for supporting paraffin. This chemical modification changes the physical and chemical parameters of the support material, enabling it to effectively hold phase-change materials without requiring expensive alternative materials.
2Reliability
If multi-layer graphene is used to enhance thermal conductivity, then heat transfer capability is improved, but thermal conductivity between layers remains insufficient
Solution Approach 1:
Instead of using multi-layer graphene with interlayer thermal conductivity problems, the patent employs acid-modified fly ash as a alternative support structure. The porous structure of fly ash provides adequate thermal management functionality at a fraction of the cost, avoiding the inherent limitations of graphene-based solutions.
3Strength
If dense concrete structure is used to achieve high strength, then compressive strength is improved, but thermal insulation performance deteriorates
Solution Approach 1:
The patent incorporates foam structures and porous acid-modified fly ash into the concrete matrix, creating a hierarchical porous system. These pores provide thermal insulation by trapping air and reducing heat transfer pathways, while the surrounding concrete matrix maintains structural strength, achieving a balance between mechanical performance and thermal insulation.
Solution Approach 2:
The patent creates a composite material system combining cement matrix, foam structures, acid-modified fly ash, and paraffin phase-change materials. This multi-component composite leverages the strength of cement, the insulation of foam, the surface area of modified fly ash, and the thermal regulation of paraffin to achieve both structural and thermal performance simultaneously.
4Reliability
If phase-change materials are added to improve heat-absorbing capability, then temperature regulation is enhanced, but structural stability deteriorates
Solution Approach 1:
The patent uses acid-modified fly ash as an intermediary carrier to hold paraffin phase-change materials within its porous structure. This intermediary structure prevents the paraffin from disrupting the concrete matrix, maintaining structural stability while enabling the phase-change material to provide thermal regulation functionality.
Solution Approach 2:
The porous structure of acid-modified fly ash provides a confined environment for paraffin, preventing it from flowing freely and compromising structural integrity. The pore walls contain the phase-change material while allowing it to undergo phase transitions, thereby maintaining both structural stability and heat-absorbing capability.
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 concrete exhibits lower thermal conductivity, higher compressive strength, and lower production costs, suitable for large-scale production and effective temperature regulation in buildings, reducing energy consumption.
Implementation Method 1
a porous material adsorption method is used so that the eutectic phase-change material is adsorbed in pores of the gas-phase silicon dioxide
Implementation Method 2
0.1-0.4% of a hydrogen peroxide decomposition catalyst
Implementation Method 3
0.5-2% of an aqueous hydrogen peroxide solution, and 0.1-0.4% of a hydrogen peroxide decomposition catalyst
Implementation Method 4
Phase-change materials could absorb or emit a large amount of heat during a phase change
Implementation Method 5
Phase-change materials could absorb or emit a large amount of heat during a phase change
Implementation Method 6
The phase-change heat-storage foamed concrete provided by the present disclosure has a low thermal conductivity
Data Source
AI summary
A phase-change heat-storage foamed concrete, and a preparation method and use thereof are provided. The phase-change heat-storage foamed concrete provided by the present disclosure is prepared from raw materials including, in percentages by mass: 50-70% of a cement, 2-20% of a supported phase-change material, 15-35% of water, 0.1-0.5% of a water-reducing agent, 0.5-1.5% of a foam stabilizing agent, 0.5-2% of an aqueous hydrogen peroxide solution, and 0.1-0.4% of a hydrogen peroxide decomposition catalyst. The supported phase-change material includes an acid-modified fly ash and a paraffin supported on a surface and in a pore structure of the acid-modified fly ash, and the aqueous hydrogen peroxide solution has a mass percentage concentration of 25-30%.