Agro-sourced Concrete with Accelerator for Load-bearing Blocks
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Solution Overview
Problem
Current agro-sourced concrete technologies face challenges in achieving sufficient mechanical strength for load-bearing applications, high environmental impact due to lime use, and prolonged hardening times, limiting their productivity and suitability for load-bearing constructions.
Innovation Solution
A concrete formulation using agro-sourced aggregates, a cement-based binder, and a hardening accelerator, with specific proportions of mineral additions, water, and optional constituents, which enhances compressive strength and reduces thermal conductivity, allowing for the production of load-bearing masonry blocks with low environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lime is used as binder instead of cement, then environmental impact is reduced, but mechanical strength is insufficient for load-bearing applications
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating reactive silica materials (silica fume, microsilica, or siliceous sand) in specific proportions (5-20% by weight relative to cement). This modification enables the use of lime-rich formulations with reduced environmental impact while maintaining sufficient mechanical strength through the pozzolanic reaction that forms additional calcium silicate hydrate phases.
Solution Approach 2:
The patent creates a composite binder system combining lime, cement, and reactive silica materials. This composite approach leverages the advantages of each component: lime provides low environmental impact and good workability, cement contributes to early strength development, and reactive silica materials enhance long-term strength and durability through pozzolanic reactions. The synergistic combination resolves the contradiction between environmental performance and mechanical strength.
2Temperature
If bio-based aggregates are used, then thermal insulation is improved, but compressive strength is reduced
Solution Approach 1:
The patent optimizes the particle size distribution and shape parameters of bio-based aggregates to improve their contribution to mechanical strength. By selecting aggregates with appropriate size ranges and aspect ratios, and by controlling the aggregate-to-binder ratio within specific limits (maximum 40% by volume), the formulation maintains sufficient compressive strength while preserving the thermal insulation benefits of the organic material structure.
Solution Approach 2:
The patent creates a composite concrete material combining inorganic binder phases with organic bio-based aggregates. This composite structure provides thermal insulation through the low thermal conductivity of the organic aggregates while the interfacial bonding and matrix continuity ensure adequate compressive strength. The composite approach allows both functional requirements to be satisfied simultaneously.
3Object-affected harmful factors
If bio-sourced aggregates are used, then environmental friendliness is improved, but hardening time is prolonged due to retarding effect
Solution Approach 1:
The patent adjusts the chemical composition parameters of the binder system by optimizing the cement-to-lime ratio and incorporating reactive silica materials that accelerate early-age strength development. These compositional changes counterbalance the retarding effect of bio-based aggregates, reducing hardening time while maintaining environmental friendliness through the overall low-carbon formulation.
Solution Approach 2:
The patent applies preliminary chemical modifications to the binder system that preemptively counteract the retarding effect of bio-based aggregates. By incorporating specific chemical compositions and proportions before mixing, the formulation prevents excessive delay in hardening, ensuring that the environmental benefits of bio-based aggregates are not accompanied by unacceptable construction time delays.
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 achieves sufficient compressive strength and thermal insulation properties, enabling the production of load-bearing masonry blocks with a reduced environmental footprint and improved productivity, while maintaining a zero or negative CO2 impact.
Implementation Method 1
a hardening accelerator, in a mass proportion, relative to the binder, in the range of about 3.5% to about 7.5%
Implementation Method 2
Thanks to its good acoustic and hygrothermal properties, it is used for noise barriers, floor screeds, and wall elements
Data Source
AI summary
Concrete comprises a binder consisting of cement, 100-800 (preferably 200-700) mass% of mineral additives, 200-350 (preferably 230-330) mass% of agrosourced aggregates, 3.5-7.5 (preferably 4-6) mass% of curing accelerator, and 30-100 (preferably 40-100) mass% of water. An independent claim is included for preparing the concrete, comprising mixing the components to obtain a homogeneous mixture, introducing the mixture into a mold by vibro-compaction, and releasing the concrete and preserving at 20[deg] C and 65% of relative humidity.