Pelletized Concrete Placement Using Conventional Ready-Mix Trucks
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Solution Overview
Problem
Traditional Roller Compacted Concrete (RCC) methods face challenges in achieving consistent mix proportions and homogeneity, especially in small projects, due to the need for specialized equipment and zero-slump concrete consistency, which is difficult to handle and transport using conventional ready-mix equipment.
Innovation Solution
A method involving the use of pelletizing agents like cellulose, chitosan, and polyacrylics to create a pelletized concrete with a VEBE time of V0 to V2, allowing for the use of conventional ready-mix equipment for mixing and transporting RCC, enabling better control over mix design and distribution, and facilitating higher compaction levels and strength development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional RCC methods use zero-slump concrete consistency, then the concrete can support roller equipment without sinking, but the concrete becomes difficult to handle and transport using conventional ready-mix equipment
Solution Approach 1:
The patent changes the consistency parameter of concrete from zero-slump to S1-S5 slump classes, making it fluid enough for conventional transport while maintaining roller support capability through controlled plasticity and binder distribution
Solution Approach 2:
The patent performs preliminary mixing and consistency adjustment at the central plant before transport, ensuring the concrete achieves optimal plasticity and binder distribution prior to being loaded into conventional ready-mix trucks
2Productivity
If pug mills are used for continuous mixing, then high-volume applications can be handled, but control over mix proportioning is lost leading to homogeneity consistency problems
Solution Approach 1:
The patent introduces a central mix plant as an intermediary between material production and placement, where precise dosing equipment controls mix proportions before the concrete is transported to the placement site
Solution Approach 2:
The patent segments the RCC production process into distinct stages: precise mixing at the central plant, controlled transport in conventional trucks, and staged placement operations, allowing quality control at each step
3Ease of manufacture
If conventional ready-mix equipment is used for RCC, then equipment availability and cost are improved, but the equipment cannot properly handle zero-slump concrete discharge and distribution
Solution Approach 1:
The patent changes the concrete consistency parameter from zero-slump to S1-S5 slump classes, enabling conventional ready-mix equipment to properly discharge and distribute the concrete while maintaining adequate plasticity for binder distribution
Solution Approach 2:
The patent performs preliminary consistency adjustment and binder distribution at the central plant before transport, so that conventional equipment only needs to handle already-optimized concrete
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 allows for higher quality and strength RCC production, reduced cement usage, improved vehicle resistance, and efficient use of conventional equipment for both small and large projects, with enhanced compaction and reduced need for post-curing, while maintaining homogeneity and fiber distribution.
Implementation Method 1
adding at least one pelletizing agent selected from the group consisting of cellulose, chitosan, polyacrylics, polyamines, polyvinylalcohols, polysaccharides, collagen, acrylamide, lactic acid, methacrylic acid, methacrylate, hydroxyethyl, ethylene glycol, ethylene oxide, acrylic acid, inorganic flocculants and inorganic coagulants to the concrete
Implementation Method 2
discharging the pelletized concrete obtained in step (b) on the sub-base from the concrete transportation truck, rotating the drum of the concrete transportation truck
Implementation Method 3
once the RCC concrete has been distributed evenly to compact the concrete on the sub-base
Data Source
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AI summary
Method for placement of roller compacted concrete (RCC) on a sub-base to produce a concrete pavement, which comprises: (a) dosing a concrete or concrete ingredients and loading said concrete or concrete ingredients into a concrete transportation truck, (b) adding at least one pelletizing agent to the concrete and waiting from 3 to 15 minutes under constant mixing to produce a pelletized concrete and (c) discharging the pelletized concrete obtained in step (b) on the sub-base from the concrete transportation truck, rotating the drum of the concrete transportation truck.