Substandard Cement Reactor Deaeration
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Solution Overview
Problem
The shelf life of cement is limited due to moisture absorption and prehydration, leading to reduced concrete strength, and existing methods to extend shelf life are not fully effective in utilizing substandard cement.
Innovation Solution
A method involving the use of a superplasticizer and air-detrainer in excess of normal recommended amounts, combined with dry processing and deaeration in a thin layer reactor to reduce air content and viscosity, effectively disrupting cement agglomerations and extending the usability of substandard cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If cement is stored for extended periods, then shelf life is extended, but cement activity and concrete strength deteriorate due to moisture absorption and prehydration
Solution Approach 1:
The patent applies preliminary action by adding hydrophobic agents (such as oleic acid, stearic acid, or other water-repellent substances) to cement before storage to prevent moisture absorption in advance. This preliminary protective measure allows cement to maintain its activity during extended storage periods without prehydration, thereby resolving the contradiction between extended shelf life and maintained concrete strength
Solution Approach 2:
The patent uses hydrophobic agents as intermediary substances that mediate between the cement and atmospheric moisture. These intermediaries form protective layers on cement particles, preventing direct contact with water during storage, thus allowing extended shelf life while preserving cement reactivity and concrete strength
2Adaptability or versatility
If substandard cement with high air content is used, then material availability is improved, but concrete quality and compressive strength are reduced
Solution Approach 1:
The patent applies parameter changes by modifying the air content parameter in substandard cement through mechanical deaeration processes. By reducing air content from potentially high levels down to optimal ranges (0.5-8%), the patent transforms substandard cement into a quality acceptable for producing concrete with adequate compressive strength, thus resolving the contradiction between material availability and concrete quality
Solution Approach 2:
The patent replaces chemical or lengthy processing methods with mechanical deaeration techniques to remove excess air from substandard cement. This mechanical approach efficiently reduces air content without complex chemical treatments, enabling the use of substandard cement while maintaining concrete strength requirements
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 significantly reduces air content in concrete, enhancing the compressive strength and shelf life of cement-based materials, making substandard cement usable for longer periods.
Implementation Method 1
deaerating the cementitious material during the discharge period of the cementitious material from the mixer via a vibrating thin layer reactor, the thin layer reactor forming a thin continuous layer of plastic cementitious material and temporarily reducing the viscosity of the plastic cementitious material in the reactor
Data Source
AI summary
The present invention relates to relates to methods of making concrete from cement and, in particular, methods of making usable standard concrete from aged or otherwise substandard cement.