Concrete Mixing via Retarder-Treated Cement Paste Storage
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Solution Overview
Problem
Conventional methods for controlling the setting and hardening of concrete require additional costs due to the need for both retarders and promoters, and lack flexibility in production and handling, as they often necessitate final product formation in a batcher plant, limiting the ability to adjust setting and hardening times effectively.
Innovation Solution
A method involving the mixing of aggregate with cement paste that has been treated with a retarder, allowing the suppression of setting and hardening, which can then be stored and later mixed with aggregate to cancel the setting-delaying effect without requiring a special promoter or additional cement, enabling flexible production and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If retarder and promoter are added to control setting and hardening time, then flexibility of production and handling is enhanced, but production cost increases
Solution Approach 1:
The invention extracts and eliminates the promoter from the conventional retarder-promoter system. By adding retarder only to the mixing water and relying on the natural cancellation of the setting-delaying effect during concrete mixing, the need for promoter is removed, thereby reducing production cost while maintaining flexibility in setting time control
Solution Approach 2:
The system uses the concrete mixing process itself to cancel the setting-delaying effect. The mechanical mixing of aggregate with cement paste containing retarder naturally eliminates the delay effect, making the system self-regulating without requiring additional promoter additives
2Adaptability or versatility
If cement paste is produced in a batcher plant and conveyed to another place for final concrete production, then flexibility of production and handling is enhanced, but setting and hardening control becomes more difficult
Solution Approach 1:
The retarder is added to the mixing water during the preliminary cement paste production stage in the batcher plant. This preliminary action allows the cement paste to be stored and transported without setting, and the setting-delaying effect is naturally canceled during the final concrete mixing at the destination, ensuring reliable setting control throughout the process
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 reduces production costs, enhances the flexibility of concrete production and handling by allowing the cement paste to be stored and mixed as needed, canceling the setting-delaying effect without deteriorating its quality, and improving the flow properties and strength of the final concrete product.
Implementation Method 1
hydration reaction of cement is suppressed by the retarder
Implementation Method 2
By this mixing operation, the setting-delaying effect obtained by the retarder is canceled
Data Source
AI summary
The present invention provides a producing method of concrete capable of appropriately controlling setting and hardening, and having excellent flexibility of production and handling of concrete. The producing method of concrete includes a cement paste mixing step and a concrete mixing step. In the cement paste mixing step, cement, mixing water and retarder are mixed together to obtain cement paste. According to this, setting and hardening of the cement paste are suppressed, and it is possible to store the cement paste for predetermined time. In the concrete mixing step, aggregate is input into the cement paste, and they are mixed together to obtain concrete. By the mixing operation, a setting-delaying effect is canceled.