Concrete Mixture with Electric Arc Furnace Slag Granules
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Solution Overview
Problem
Current concrete mixtures from group 3, made from demolition granulate, do not possess the strength properties necessary for demanding applications in building construction, limiting their use compared to group 1 and 2 concretes.
Innovation Solution
A concrete mixture is developed with a weight ratio of electro-hub slag granules to mixed breakdown granules between 1:1 and 2:1, which enhances the strength and elasticity of the concrete, allowing it to be used in more demanding applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Group 3 concrete with mixed demolition granulate is used, then material recycling is improved, but compressive strength is insufficient for demanding applications
Solution Approach 1:
The patent combines electric furnace slag granulate with mixed demolition granulate to create a composite aggregate mixture. This composite approach leverages the beneficial properties of both materials: the strength-enhancing characteristics of EAF slag and the recycling benefits of demolition granulate, achieving compressive strengths suitable for demanding construction applications while maintaining material versatility.
Solution Approach 2:
The patent optimizes the weight ratio parameter of EAF slag granulate to mixed demolition granulate within the range of 1:1 to 2:1. By carefully controlling this compositional parameter, the concrete mixture achieves enhanced compressive strength while maintaining adaptability for various construction applications, resolving the contradiction between strength and versatility.
2Strength
If electric furnace slag granulate is added to mixed demolition granulate, then compressive strength increases, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a weight ratio range of 1:1 to 2:1 for EAF slag granulate to mixed demolition granulate, providing clear manufacturing guidance. This parameter specification simplifies the mixing process by establishing optimal proportions, reducing the complexity of formulation while achieving enhanced compressive strength.
3Adaptability or versatility
If recycled construction waste is used, then sustainability is improved, but strength properties are insufficient for structural concrete
Solution Approach 1:
The patent creates a composite aggregate system combining EAF slag granulate with mixed demolition granulate. This composite material approach enables Group 3 concrete to achieve strength properties comparable to Group 1 and 2 concretes, thereby expanding application range to include structural concrete while maintaining sustainability through recycled waste materials.
Solution Approach 2:
Electric furnace slag granulate acts as an intermediary material that bridges the gap between recycled demolition waste and the strength requirements for structural concrete. The EAF slag provides the necessary strength enhancement while allowing the concrete to maintain its recycled content, thus enabling broader application ranges.
Data Source
AI summary
The concrete mixture according to the invention contains aggregates with mixed demolition granules and slag granules, cement, water, and a concrete plasticizer. The aggregates consist of at least 75% by volume of mixed demolition granules and slag granules, and the slag granules are electric arc furnace slag granules. The weight ratio of electric arc furnace slag granules to mixed demolition granules is in the range of a minimum of 1:1 to a maximum of 2:1. The resulting strength properties significantly expand the range of applications for concrete made with mixed demolition aggregates.