Mineral Adhesive Agent for Early Strength and Storage Stability
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Solution Overview
Problem
Existing hydraulic binders for high-strength concretes face challenges with storage stability and inconsistent early strength development due to uncontrollable reactions with additives and temperature fluctuations, limiting their suitability for ready-mixed concrete production.
Innovation Solution
A mineral-based hydraulic binder system using granulometrically optimized normal and fine cements with finely divided SiO2 and CaO components, where the pozzolanic reaction occurs during the resting phase before cement mineral phase development, ensuring early and final strength enhancement without affecting workability or subsequent hardening reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic additives are used to control early strength in fast cements, then early strength can be adjusted, but storage stability deteriorates and reaction behavior becomes uncontrollable
Solution Approach 1:
The patent replaces long-term storage-prone organic additives with a short-term acting mineral accelerator system. The accelerator component (very fine calcium hydroxide) acts immediately upon contact with mixing water during the resting phase, achieving early strength acceleration without compromising long-term storage stability of the cement composition.
Solution Approach 2:
The patent changes the fundamental parameter of the accelerator from organic chemistry to mineral chemistry. By using very fine calcium hydroxide with specific surface area and particle size characteristics, the system achieves controllable early strength acceleration through physical-chemical parameters rather than organic molecular interactions, eliminating storage stability issues.
2Strength
If very fine calcium hydroxide is added to accelerate CSH formation, then early strength development is improved, but storage stability deteriorates due to carbonation
Solution Approach 1:
The patent applies preliminary action by adding the very fine calcium hydroxide accelerator component to the cement composition in advance, but designing it to remain dormant during storage and only activate during the resting phase after mixing with water. The accelerator is protected from carbonation during storage and only becomes reactive when needed, solving both early strength and storage stability problems.
Solution Approach 2:
The patent provides beforehand cushioning by formulating the cement composition to protect the accelerator component from harmful carbonation during storage. The system is designed so that the calcium hydroxide accelerator remains stable during storage and only reacts with CO2 when intentionally activated during the hardening process, preventing premature degradation.
3Strength
If microsilica is used for pozzolanic reaction to increase density and strength, then durability and compressive strength are improved, but concrete color becomes dark and uneven
Solution Approach 1:
The patent replaces microsilica with a different mineral accelerator system based on very fine calcium hydroxide. This alternative approach achieves early strength acceleration and dense structure formation through a different mechanism (direct CSH acceleration rather than pozzolanic reaction), avoiding the color darkening side effect while maintaining strength benefits.
4Ease of operation
If normal cements are used with standard hardening, then workability is maintained, but early strength development is slow
Solution Approach 1:
The patent merges two cement systems: normal cement particles providing workability and standard hardening behavior, combined with a very fine calcium hydroxide accelerator component that accelerates early CSH formation. The mixture maintains the beneficial properties of normal cement while adding early strength acceleration during the resting phase, achieving both workability and early strength.
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
The system achieves higher early strengths and increased final strengths, with adjustable strength levels, improved storage stability, and no adverse influence on workability or subsequent hardening reactions, making it suitable for fast and durable concretes.
Implementation Method 1
the SiO2 component reacts with the Ca(OH)2 component, which has been added in finely divided form, with formation of hardening C-S-H phases
Data Source
Figure 1a~1c
Figure 2
Figure 3a~3c
AI summary
The invention relates to a mineral, hydraulic binder, in particular for the production of concrete or mortars or cement suspensions based on at least one cement, wherein the cement comprises clinker phases such as, in particular, C3S, C2S, C3A, C4AF and optionally additional components, which form hydrate phases that harden with water to cement stone, and wherein the cement has a resting phase of, for example, 4 to 8 hours after mixing with water, in which no significant hardening reactions take place, wherein, in addition, at least one finely divided SiO2 component and at least one finely divided CaO component form calcium silicate hydrate phases that harden with mixing water during the resting phase due to a pozzolanic reaction, resulting in early strength.