Fly Ash Cement Air Pore Stabilization
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Solution Overview
Problem
The stability of cementitious compositions containing fly ash is often reduced, making it difficult to maintain a desired content of air, especially when a high percentage of fly ash is used.
Innovation Solution
A method involving a mixture of a polymeric dispersant, at least one air-entraining agent, at least one anti-foam agent, and water is used for the controlled introduction of air in cementitious materials containing fly ash, achieved through intergrinding and/or intermixing with the cementitious material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fly ash is used as part of the binder system to improve workability and reduce environmental impact, then the stability of the cementitious composition is reduced, making it difficult to maintain desired air content
Solution Approach 1:
The patent uses a composite admixture system combining multiple components (polymeric dispersant, air-entraining agent, and anti-foam agent) to simultaneously achieve workability improvement and air content stability in fly ash-containing cementitious materials. This composite approach allows the different components to work synergistically, with the polymeric dispersant providing workability enhancement while the air-entraining and anti-foam agents control air pore formation and stability.
2Productivity
If a high percentage of fly ash is used in the cementitious material, then environmental impact is reduced and resource efficiency is improved, but the ability to introduce and maintain desired air content becomes difficult
Solution Approach 1:
The patent modifies the chemical and physical parameters of the cementitious system by introducing specific admixture components that change the surface properties and fluid dynamics. The polymeric dispersant alters the rheological parameters to improve workability, while the air-entraining and anti-foam agents modify the air pore formation parameters, allowing precise control of air content even in high fly ash formulations where traditional methods fail.
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 method effectively stabilizes the air content in cementitious materials with fly ash, ensuring a specified amount and distribution of air pores, thereby improving the workability and stability of the compositions.
Implementation Method 1
the stability of the resulting cementitious composition was sometimes reduced. In order to improve workability and other properties of cementitious compositions such as concrete compositions, it is known to use admixtures.
Data Source
Figure 1
AI summary
This invention relates to methods for the controlled introduction of air in a cementitious material comprising fly ash where a polymeric dispersant, at least one air-entraining agent, at least one anti-foam agent, and water is intergrinded and/or intermixed. This invention also relates to computer implemented methods to determine proportions of admixture constituents to be added for the controlled introduction of air to a cementitious material comprising fly ash.