Four-Element Cementitious Material Using Waste Incineration Ashes
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Solution Overview
Problem
Existing cementitious materials using waste incineration fly ash require excessive additives for strength and fail to fully utilize high silicate material bottom ash, limiting their potential in preparing low-cost, clinker-free cementitious materials.
Innovation Solution
A low-cost four-element system cementitious material composed of water-quenched blast furnace slag, waste incineration bottom ash, water-washed waste incineration fly ash, and desulfurization gypsum, which are mixed in specific ratios to create a cement-free clinker-based material without the need for cement clinker or additional additives, leveraging the synergistic properties of these industrial and municipal solid wastes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-washed fly ash is used to prepare cementitious materials, then hazardous waste disposal is improved, but excessive additives are required to achieve practical strength
Solution Approach 1:
The patent combines water-washed fly ash with bottom ash and blast furnace slag to form a composite cementitious material system. This merging of multiple waste materials creates synergistic effects where the alkaline activation solution activates all components simultaneously, eliminating the need for excessive additives while maintaining practical strength
Solution Approach 2:
The invention uses a composite material system consisting of fly ash, bottom ash, and blast furnace slag activated by an alkaline solution. This composite approach leverages the complementary properties of each waste material to achieve the required mechanical strength without relying on excessive chemical additives
2Strength
If traditional cement clinker production is used, then hydraulic cementitious material is obtained, but the process is complex, costly and energy-consuming
Solution Approach 1:
The patent extracts the essential function of cement clinker (hydraulic binding) and achieves it through a simplified alternative process. Instead of the complex five-step clinker production process, the invention directly uses waste materials activated by an alkaline solution to produce the same hydraulic cementitious effect, eliminating unnecessary process complexity
Solution Approach 2:
The invention replaces expensive, energy-intensive cement clinker production with a low-cost alternative using readily available waste materials. The process uses inexpensive alkaline activation solutions and simple mixing procedures to achieve comparable cementitious properties without the high costs and complexity of traditional clinker manufacturing
3Ease of manufacture
If fly ash and bottom ash are disposed of separately, then hazardous waste management is simplified, but resourcefulness and synergistic harmlessness are reduced
Solution Approach 1:
The patent merges the disposal of fly ash and bottom ash into a single integrated cementitious material production process. By combining these materials in specific proportions and activating them together with an alkaline solution, the system achieves synergistic harmlessness while maximizing resource utilization, proving that integrated management is more resourceful than separate disposal
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 solution simplifies the composition, reduces material costs, and enhances the utilization of waste incineration fly ash and bottom ash, achieving high compressive strength and environmental benefits by stabilizing hazardous materials, thus promoting sustainable waste management and reducing environmental hazards.
Implementation Method 1
Water washing (also known as neutral leaching) is a pretreatment method for fly ash, which effectively removes soluble salts like Cl− and some heavy metals in fly ash
Implementation Method 2
a low-cost four-element system cementitious material, including following raw materials in percentage by mass according to 100% by mass of the low-cost four-element system cementitious material: 20-60% of water-quenched blast furnace slag, 10-40% of waste incineration bottom ash, 20% of water-washed waste incineration fly ash and a balance of desulfurization gypsum
Data Source
AI summary
A low-cost four-element system cementitious material, a preparation method and an application thereof are provided by the present disclosure, and the cementitious material is used in the fields of mine cementing filling and building materials. The four-element system cementitious material includes the following raw materials in percentage by mass: 20-60% of water-quenched blast furnace slag, 10-40% of waste incineration bottom ash, 20% of pretreated waste incineration fly ash and the balance of desulfurization gypsum. The low-cost four-element system cementitious material is used to replace cement to prepare mine cementing filling materials, and is also used to prepare concrete materials for construction industry.