3D Construction Printing Additive Injection for Material Stability
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Solution Overview
Problem
3D construction printing systems face challenges with material quality degradation and ineffective mixing of additives in non-homogeneous composite materials like concrete, leading to imperfections and weaknesses in printed structures, especially when constructing large structures, due to segregation and premature setting during transportation and production stops.
Innovation Solution
A method involving a precursor printing material with a binder, water, and sand, where a first additive is added downstream of the material pump before the material reaches the hopper, allowing for improved mixing and control of material properties, including the use of a viscosity modifying agent to adjust viscosity and prevent premature setting, facilitating easier transportation and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If concrete is transported over longer distances through pipes or tubes, then the construction can be built at remote locations, but the material quality deteriorates due to segregation and uneven distribution of aggregates
Solution Approach 1:
The patent applies preliminary action by adding all necessary additives (water, viscosity modifying agents, accelerators, retarders) directly into the concrete mixture before transportation begins. This pre-preparation ensures the concrete maintains optimal flowability and composition stability throughout the transportation process, preventing segregation even over long distances through pipes or tubes.
2Loss of time
If production stops occur during concrete pumping, then the construction process can be paused for planning or emergencies, but the consistency of waiting concrete changes and may set prematurely
Solution Approach 1:
The patent employs parameter changes by incorporating chemical additives that dynamically adjust the concrete's rheological properties. Viscosity modifying agents allow the concrete to maintain pumpable consistency during stops, while accelerators and retarders can be activated based on timing requirements to control setting behavior, enabling flexible production stops without compromising material quality.
Solution Approach 2:
The patent uses chemical additives as intermediaries between the concrete mixture and the transportation/pumping process. These additives act as mediators that prevent harmful interactions between the concrete components during storage and transport, maintaining stability and preventing premature setting even when production stops occur.
3Adaptability or versatility
If multiple additives are added to the hopper to fine-tune printing material properties, then the material can be adjusted for optimal printing, but effective mixing becomes difficult and material properties vary
Solution Approach 1:
The patent applies preliminary action by pre-mixing all additives with the concrete in controlled proportions before the mixture enters the printing system. This advance preparation ensures uniform distribution of all components, eliminating mixing difficulties and property variations that would occur if additives were added separately during printing operations.
Solution Approach 2:
The patent merges multiple additive addition steps into a single integrated mixing process. All water, viscosity modifying agents, accelerators, and retarders are combined with the concrete mixture simultaneously in controlled ratios, ensuring homogeneous distribution and consistent material properties throughout the printing process.
4Strength
If the printing material is made stiffer to maintain structural integrity during printing, then the printed construction quality improves, but the material becomes harder to transport and pump
Solution Approach 1:
The patent employs parameter changes by using viscosity modifying agents that allow the concrete to exhibit different rheological properties at different stages. During transportation, the concrete maintains lower viscosity for easy pumping, while accelerators and other additives ensure rapid setting and high strength development once deposited, achieving both transportability and structural integrity.
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
This approach ensures a consistent composition of the printing material, reduces the risk of segregation and premature setting, and allows for the use of standard concrete types, simplifying equipment needs and construction processes, while maintaining material quality and reducing production stop challenges.
Implementation Method 1
forming a flow of the precursor printing material towards the printing unit using a material pump
Implementation Method 2
including the use of a viscosity modifying agent to adjust viscosity and prevent premature setting
Implementation Method 3
mixing the precursor printing material, the first additive and the optional one or more additional additives to form the printing material
Data Source
AI summary
A method for 3D printing a construction using a printing unit includes obtaining a precursor printing material, the precursor printing material including a binder, water, and sand; forming a flow of the precursor printing material towards the printing unit using a material pump; adding downstream of the material pump an amount of a first additive to the precursor printing material; optionally adding one or more additional additives; mixing the precursor printing material, the first additive and the optional one or more additional additives to form the printing material; and extruding the printing material via the printing head.