Reactive Belite Activator for Low pH Clinker Substitutes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current stimulators for latent hydraulic and pozzolanic materials, such as blast furnace slag and fly ash, often result in high pH values when mixed with water, leading to occupational safety concerns and incompatibility with sensitive materials, and they can cause a decrease in early strengths of cement, necessitating the development of alternative excitation mechanisms for rapid and reliable hardening at lower pH values.
Innovation Solution
The use of reactive belite, produced through hydrothermal treatment and tempering, as a stimulator for latent hydraulic and pozzolanic materials, which contains x-Ca2SiO4 and an X-ray amorphous phase, to enhance the hydraulic reaction and provide high early strength without the need for highly alkaline or sulfate excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stimulators (calcium hydroxide, alkali hydroxides, sulfates) are used to excite latent hydraulic and pozzolanic materials, then hydraulic hardening is achieved, but high pH values are produced causing occupational safety concerns and incompatibility with sensitive materials
Solution Approach 1:
The patent changes the chemical parameters of the stimulator by using reactive belite (x-Ca2SiO4) instead of traditional high-pH stimulators. This material achieves hydraulic excitation through a different chemical mechanism that does not produce high pH values, thus maintaining hardening reliability while eliminating the harmful high pH effect
Solution Approach 2:
The patent introduces reactive belite as an intermediary substance that mediates the hydraulic reaction between water and latent hydraulic materials. This intermediary provides the necessary chemical activity to initiate hardening without directly creating the harmful high pH environment of traditional stimulators
2Strength
If highly alkaline or sulfate excitation is used to achieve rapid hardening, then early strength is improved, but the decrease in early strengths of cement occurs and environmental friendliness is reduced
Solution Approach 1:
The patent changes the chemical composition and reactivity parameters of the stimulator by using reactive belite with specific phase composition (x-Ca2SiO4 and X-ray amorphous phase). This enables rapid hardening and high early strength through a low-pH mechanism, avoiding the harmful effects of highly alkaline or sulfate excitation while maintaining environmental friendliness
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
Reactive belite effectively stimulates the hydraulic reaction of latent hydraulic and pozzolanic materials, achieving high early strength and maintaining a pH below 12.6, thus addressing the limitations of existing stimulators and enabling reliable and rapid hardening in a more environmentally friendly manner.
Implementation Method 1
a latent hydraulic binder therefore contains both reactive SiO2 and reactive CaO in sufficiently high quantities to harden hydraulically with the help of an external stimulus (stimulator) when reacting with water to form calcium silicate hydrates
Implementation Method 2
reactive belite, produced through hydrothermal treatment and tempering
Implementation Method 3
hydrothermal treatment of a starting material containing sources of CaO and SiO2 in an autoclave at a temperature of 100 to 300 °C
Implementation Method 4
annealing of the intermediate obtained at 350 to 495 °C
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to activators for clinker substitute material, comprising reactive belite which can be obtained by hydrothermally treating a starter material containing sources of CaO and SiO2 by autoclave at a temperature of between 100 and 300°C and tempering the obtained intermediate product at 350 to 495°C; hydraulic binders based on clinker substitute material and reactive belite as an activator, which can be obtained by hydrothermally treating a starter material containing sources of CaO and SiO2 by autoclave at a temperature of between 100 and 300°C and tempering the obtained intermediate product at 350 to 495°C; a method for activating clinker substitute material by adding reactive belite which can be obtained by hydrothermally treating a starter material containing sources of CaO and SiO2 by autoclave at a temperature of between 100 and 300°C and tempering the obtained intermediate product at 350 to 495°C; and to the use as an activator of the material containing reactive belite.