Foam Cement Thermal Insulation at High Temperatures
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Solution Overview
Problem
Current thermal insulating materials fail to maintain effectiveness at high temperatures and provide both lightweight and sufficient compressive strength, particularly in applications exceeding 600 degrees Celsius.
Innovation Solution
A high temperature lightweight thermal insulating material is created by mixing cement or silica sand with water and a foaming agent, such as aluminum powder or surfactant, allowing the mixture to foam and set, resulting in a material with a maximum use temperature up to 1800 degrees Celsius, a density of 0.1 to 1.0 g/cm3, and compressive strength of 30 to 3000 PSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermal insulating materials are used, then thermal insulation is provided, but they fail to maintain effectiveness at high temperatures exceeding 600 degrees Celsius
Solution Approach 1:
The patent changes the chemical composition parameters of the insulating material by using specific cement types (calcium aluminate cement, ordinary Portland cement) and silica sand ratios, along with controlled water-cement ratios and foaming agent concentrations, to achieve stable foam structure and thermal resistance at temperatures up to 1800°C
Solution Approach 2:
The patent creates a composite material system combining cementitious binders (calcium aluminate cement or ordinary Portland cement), silica sand aggregates, and foaming agents to produce a porous foam concrete structure that maintains thermal insulation properties at high temperatures through the synergistic effect of its components
2Weight of moving object
If lightweight insulating materials are used, then reduced density is achieved, but compressive strength becomes insufficient
Solution Approach 1:
The patent intentionally creates a porous foam structure with controlled void content by using foaming agents (aluminum powder or surfactants) that generate stable bubbles in the cement-silica sand matrix, achieving lightweight density (0.1-1.0 g/cm³) while the porous structure provides both insulation and structural integrity through the cementitious binder framework
Solution Approach 2:
The patent optimizes the water-cement ratio (0.2-0.6) and foam stabilizer concentration to control the foam cell structure and wall thickness, balancing density and compressive strength by adjusting the proportion of void space versus solid matrix in the foam concrete
3Loss of energy
If foam structure is introduced to reduce density, then thermal insulation improves, but structural integrity may be compromised
Solution Approach 1:
The patent utilizes a controlled porous foam structure where air-filled voids (50-95% porosity) provide thermal insulation by reducing thermal conductivity (0.05-0.30 W/(m·K)), while the cementitious matrix and foam wall structure maintain structural integrity through proper mix design and curing
Solution Approach 2:
The patent creates a composite foam concrete material where the cementitious binder phase and foam void phase work together, with the binder providing structural strength and the voids providing thermal insulation, achieving a balance between structural integrity and thermal performance
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 material achieves enhanced thermal insulation and structural integrity at high temperatures, with thermal conductivity ranging from 0.05 to 0.30 W/(m·K) and compressive strength of 30 to 3000 PSI, suitable for various industrial applications.
Implementation Method 1
a foaming agent, such as aluminum powder or surfactant, allowing the mixture to foam
Implementation Method 2
The foaming agent can be an aluminum powder or a surfactant
Implementation Method 3
thermal insulation and structural integrity at high temperatures, with thermal conductivity ranging from 0.05 to 0.30 W/(m·K)
Data Source
AI summary
A high temperature lightweight thermal insulating material is formed from a mixture that includes cement or silica sand, water and a foaming agent. The foaming agent can be an aluminum powder or a surfactant. The insulating material has a maximum use temperature greater than about 600 degrees Celsius.