Cellular Concrete for Structural Thermal Insulation
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Solution Overview
Problem
The construction industry faces challenges in reducing environmental impact and greenhouse gas emissions, particularly due to the high environmental impact of traditional construction materials and energy consumption for heating, which is linked to thermal insulation efficiency. Lightweight concretes with low thermal conductivity are used but often lack sufficient mechanical strength for structural applications.
Innovation Solution
A cellular concrete with a density between 600 and 1200 kg/m3 is developed, composed of a hydraulic binder, water, a plasticizer, a foaming agent, and optional additives, which allows for the production of structural and insulating construction elements without prior foam preparation, using specific proportions and mixing techniques to achieve self-compacting and hardening at atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If lightweight concrete is used to reduce density and improve thermal insulation, then thermal insulation performance is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water-to-binder ratio (0.15-0.30), plasticizer content (0.1-2.5% in dry extract), and foaming agent content (0.03-0.5% in dry extract). These parameter optimizations enable the concrete to achieve both low density (600-1200 kg/m³) and adequate mechanical strength (3-50 MPa compressive strength), resolving the contradiction between thermal insulation and mechanical strength
Solution Approach 2:
The patent uses composite materials by combining hydraulic binder, water, plasticizer, foaming agent, and optional additives (light aggregates, fillers, fibers, admixtures) to create a cellular concrete structure. This composite formulation with air bubbles representing 20-80% of volume provides both insulation properties and structural integrity
2Strength
If traditional concrete materials are used, then mechanical strength is sufficient, but environmental impact increases
Solution Approach 1:
The patent employs porous materials by creating a cellular structure with air bubbles occupying 20-80% of the concrete volume. This porous structure reduces density to 600-1200 kg/m³ and improves thermal insulation, while the use of sustainable binders and minimal chemical additives reduces environmental impact compared to traditional concrete
Solution Approach 2:
The patent changes material parameters by using sustainable binders and optimizing the composition ratios (water/binder 0.15-0.30, foaming agent 0.03-0.5% in dry extract). These parameter changes produce concrete with lower environmental impact while maintaining adequate mechanical strength for structural applications
3Strength
If foam concrete is produced with sufficient mechanical strength for structural application, then mechanical strength is improved, but density increases above 1000 kg/m3
Solution Approach 1:
The patent applies parameter changes by optimizing the water-to-binder ratio (0.15-0.30), plasticizer content (0.1-2.5% in dry extract), and foaming agent content (0.03-0.5% in dry extract). These precise parameter controls enable the production of foam concrete with density between 600-1200 kg/m³ and compressive strength of 3-50 MPa, achieving both structural strength and ultralight weight
Solution Approach 2:
The patent uses porous materials with air bubbles representing 20-80% of volume to create a cellular structure that provides high strength-to-weight ratio. The controlled porosity enables mechanical strength sufficient for structural applications while maintaining density below 1200 kg/m³, overcoming the limitation of conventional foam concrete
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 resulting cellular concrete is lightweight, insulating, and structurally sound, with reduced environmental impact, suitable for prefabricated and on-site construction elements that improve thermal and acoustic insulation, and can be used in various structural applications, including sound insulation and fire resistance.
Implementation Method 1
The foaming agent (also called expansion agent) used in the context of the present invention makes it possible, during the manufacture of concrete, to create cells filled with air
Implementation Method 2
The surface tension of the air bubbles is a decisive element in ensuring the stability of a foam such as a foam concrete in the fresh state
Implementation Method 3
The hydraulic binder is advantageously in powder form with a particle size such that at least 90% of the particles pass through a 200 μm sieve (D90<200 μm). The cement may be based on Portland clinker such as those defined in standard EN 197-1
Implementation Method 4
Lightweight concretes have low thermal conductivity. Their use has been common for several decades. Lightweight concrete is commonly characterized by a density less than or equal to 2000 kg/m3 measured after drying in an oven
Data Source
AI summary
The present invention relates to a cellular concrete having insulating and structural properties for a dry density between 600 kg/m³ and 1200 kg/m³. The invention also relates to a method for preparing said concrete. Such cellular concrete can be used for the production of building elements, particularly on construction sites.