Ultra-High Performance Concrete Formulation Using Segmented Aggregates
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Solution Overview
Problem
Ultra-high performance concretes with improved mechanical properties are not widely adopted in the construction industry due to high manufacturing costs, complex processes, and the need for special components, limiting their availability and use in regions without advanced manufacturing capabilities.
Innovation Solution
A formulation comprising Portland Cement, calcium carbonate, silica fume, silica sand, water, high-range water regulating additives, and metallic fibers, mixed in a specific process to achieve ultra-high performance concrete with good mechanical properties, durability, and ductility, while reducing costs and eliminating the need for special components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultra-high performance concrete formulations with high fiber content and multiple components are used, then mechanical properties and ductility are improved, but manufacturing costs and process complexity increase
Solution Approach 1:
The patent divides the concrete mixture into distinct size fractions: fine aggregate (0.063-4.75mm), medium aggregate (4.75-19mm), and coarse aggregate (19-38mm). This segmentation allows each fraction to fulfill specific functions in the matrix, optimizing mechanical properties while using conventional materials and processes.
Solution Approach 2:
The patent creates a composite concrete material combining cementitious binder, water, admixtures, and three fractions of natural aggregate in specific proportions. This composite structure leverages the complementary properties of each component to achieve ultra-high performance with conventional materials, avoiding the need for specialized components.
2Ease of manufacture
If conventional concrete materials and processes are used, then manufacturing costs are reduced and availability is improved, but mechanical properties and ductility are insufficient
Solution Approach 1:
The patent optimizes the proportions of conventional materials to achieve ultra-high performance. Specifically, it uses 28-38% fine aggregate, 38-48% medium aggregate, and 14-24% coarse aggregate by total volume, along with controlled water-cement ratio (0.25-0.35) and admixture dosages. These parameter optimizations enable conventional materials to deliver UHPC-level performance.
Solution Approach 2:
The patent employs natural aggregates that serve multiple functions: providing structural skeleton, controlling workability, and contributing to durability. The fine aggregate fills voids and improves paste density, while medium and coarse fractions provide structural strength. This multi-functionality of conventional materials achieves high performance without specialized components.
3Strength
If high proportions of fibers are added to improve tensile strength and ductility, then mechanical properties are enhanced, but manufacturing cost and processing complexity increase
Solution Approach 1:
The patent optimizes fiber content to 1.0-2.0% by total volume, with specific attention to fiber length (13-60mm) and diameter (0.3-0.75mm). This parameter optimization provides sufficient tensile reinforcement and ductility without excessive cost or processing complexity, balancing performance and manufacturability.
Data Source
AI summary
A formulation and method for obtaining ultra-high performance concretes, which provide a concrete with good mechanical properties of, inter alia, traction, compression, deformation, durability, ductility and toughness, with reduced related costs.