Cellular Cementitious Compositions with Reactive Dusts
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Solution Overview
Problem
Current cellular concrete materials lack durability and resistance to chemical attacks, making them unsuitable for outdoor use and structural applications due to porosity and vulnerability to sulphates and corrosive substances, while attempts to improve thermicity reduce compression resistance, and existing solutions often require expensive and energy-intensive treatments or include toxic components.
Innovation Solution
Development of cellular cementitious compositions using anhydrous calcium sulphate and Portland cement, with specific proportions of silica sand, polyester fiber, foaming additives, and water-reducing agents, which eliminate undesirable effects associated with calcium sulphate, provide high compression resistance, and are non-toxic, allowing for structural functionality without autoclave treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cellular concrete is made more porous to improve thermicity, then thermal insulation improves, but compression resistance decreases
Solution Approach 1:
The patent uses a composite material system combining cellular concrete with reactive dusts (metallurgical, construction, or industrial wastes) that contain basic oxides. This composite approach allows the material to maintain both porous structure for thermal insulation and chemical reactivity for strength development, resolving the contradiction between porosity and compression resistance.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating specific ratios of reactive dusts (10-50% by weight) with basic oxide content (CaO, MgO, Na2O, K2O) that react with carbon dioxide to form strengthening compounds. This parameter change enables the material to achieve both good thermicity and adequate compression resistance (≥5 kgf/cm²).
2Weight of stationary object
If cellular concrete is made lighter to reduce dead loads, then construction rapidity and transportation costs improve, but durability and resistance to chemical attacks worsen
Solution Approach 1:
The patent converts harmful carbon dioxide (a pollutant) into a beneficial strengthening agent. The reactive dusts in the cellular concrete absorb CO2 and transform it into carbonate compounds that fill pores and strengthen the matrix. This converts the harm of porosity (vulnerability to chemical attacks) into a benefit (chemical stability through carbonate formation), while maintaining light weight for reduced dead loads.
Solution Approach 2:
The patent changes the chemical stability parameter by incorporating dusts with high basic oxide content that create a chemically resistant environment. The resulting material maintains low density (≤2.0 g/cm³) for lightness while achieving durability through the formation of stable carbonate minerals that resist chemical degradation.
3Strength
If autoclave treatment is applied to improve compression resistance, then mechanical strength improves, but energy consumption and production cost increase
Solution Approach 1:
The patent enables the cellular concrete to self-strengthen through atmospheric carbonation. The reactive dusts naturally absorb carbon dioxide from the air and convert it into strengthening carbonate compounds without requiring external energy input or autoclave treatment. This self-service mechanism achieves compression resistance (≥5 kgf/cm²) while eliminating the high energy consumption associated with autoclaving.
Solution Approach 2:
The patent extracts the strengthening function from the energy-intensive autoclave process and transfers it to a passive atmospheric carbonation process. By selecting dusts with appropriate chemical composition (high basic oxide content), the material autonomously develops compression resistance through reaction with ambient CO2, removing the need for expensive and energy-consuming autoclave equipment.
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 solution achieves high compression resistance values (≥110 Kg/cm2) and suitable volumetric weights (≥1200 Kg/m3) for structural applications, ensuring durability and environmental safety, while reducing energy consumption and production costs, enabling the use of cellular materials as lightweight structural elements with improved thermal insulation and mechanical properties.
Implementation Method 1
the transformation of carbon dioxide into carbonates, which fill the pores of the material and confer strength
Implementation Method 2
cellular materials, since they contain infinity of cells, (opened, closed, or both) dispersed throughout its volume
Data Source
AI summary
The present invention describes improved cellular compositions that contain anhydrite that reaches high compression resistance values, of the order of 110 to 138 Kg/cm2, as well as methods of obtaining of these. The obtained cellular materials with the compositions of the invention can be used like constructive structural materials, and without they present the problems commonly associate to the anhydrous calcium sulphate presence in similar materials.