Core-Shell Perlite Granules for Lightweight Concrete Strength
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Solution Overview
Problem
Existing lightweight concrete materials exhibit poor mechanical properties, such as low compressive strength and high water absorption, due to the use of conventional lightweight particles like expanded polystyrene and porous materials, which are costly, energy-intensive to produce, and have inconsistent performance.
Innovation Solution
Inorganic pelletized perlitic lightweight granules with a core-shell structure, where expanded perlite serves as the core and a cementitious material as the shell, are developed using an encapsulation process, providing better fire resistance, higher crushing strength, and improved compatibility with concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If foamed concrete with closed pores is used to achieve lightweight and thermal insulation, then thermal insulation performance is improved, but compressive strength deteriorates
Solution Approach 1:
The patent uses composite lightweight particles comprising a porous core material (expanded perlite, vermiculite, or polystyrene) surrounded by a cementitious shell material. This composite structure combines the thermal insulation benefits of porous materials with the strength properties of cementitious materials, resolving the contradiction between thermal insulation and compressive strength.
Solution Approach 2:
The invention applies different materials with different properties to different parts of the lightweight particle: the porous core provides thermal insulation while the dense cementitious shell provides structural strength. This local differentiation of material properties allows simultaneous achievement of thermal insulation and strength requirements.
2Weight of moving object
If lightweight particles are introduced to reduce concrete density, then weight is reduced, but mechanical properties deteriorate
Solution Approach 1:
The patent employs composite lightweight particles with a porous core for weight reduction and a cementitious shell for mechanical strength. This composite structure maintains low density while significantly improving mechanical properties compared to conventional lightweight aggregates.
Solution Approach 2:
The invention differentiates the properties of different regions within the lightweight particle: the porous core region provides low density while the cementitious shell region provides high strength, allowing simultaneous achievement of weight reduction and mechanical property improvement.
3Ease of manufacture
If expanded polystyrene particles are used as lightweight aggregate, then production cost is reduced, but fire resistance deteriorates
Solution Approach 1:
The patent applies a cementitious shell coating around the polystyrene core, creating a protective barrier that provides fire resistance to the otherwise flammable polystyrene material. This local application of fire-resistant material preserves the cost benefits of polystyrene while eliminating its fire safety drawbacks.
Solution Approach 2:
The cementitious shell acts as an intermediary protective layer between the polystyrene core and the fire environment, preventing direct exposure of the polystyrene to high temperatures and thus providing fire resistance while maintaining the low-cost advantage of using polystyrene as the core material.
4Temperature
If porous lightweight particles are used to achieve thermal insulation, then thermal insulation is improved, but water absorption increases
Solution Approach 1:
The invention applies a dense cementitious shell coating around the porous core material, creating a protective barrier that prevents water from penetrating into the porous structure. This allows the porous core to maintain its thermal insulation properties while the shell prevents excessive water absorption.
Solution Approach 2:
The composite structure combines the thermal insulation properties of porous materials with the water-resistant properties of cementitious materials, achieving simultaneous improvement in thermal insulation and reduction in water absorption through the synergistic combination of different materials.
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 inorganic pelletized perlitic lightweight granules enhance the mechanical properties of lightweight concrete, achieving higher compressive strength and reduced water absorption, while maintaining thermal insulation and ease of production, thus overcoming the limitations of conventional lightweight concrete.
Implementation Method 1
The perlite core has a porous structure in order to achieve lightweight, and the cementitious shell has a dense structure in order to provide strength.
Implementation Method 2
the cementitious shell has a dense structure in order to provide strength
Data Source
AI summary
The present invention discloses inorganic pelletized perlitic lightweight granules and a preparation process and use thereof. The present invention develops through encapsulation technology a novel type of lightweight particles, namely, inorganic pelletized perlitic lightweight granules comprising expanded perlite as a core material and a cementitious material as a shell material, forming a core-shell structure in which a perlite core is encapsulated in a cementitious shell. The cementitious material including cement and fly ash is coated onto the surface of expanded perlite particles through an encapsulation process by a pelletizer under controlled water spraying. The resulting inorganic pelletized perlitic lightweight granules are lower in cost and easier to produce, and have better fire resistance, higher crushing strength, and better compatibility with concrete. The inorganic pelletized perlitic lightweight granules can overcome the problems of conventional lightweight concrete, such as high water absorption and inconsistent performance.