Solid Waste Soil Stabilizer with Bioenzyme and Adsorbents
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Solution Overview
Problem
Current road construction materials, such as soil stabilized with lime and cement, face issues of low strength, water sensitivity, and environmental concerns, leading to high project costs and frequent maintenance needs.
Innovation Solution
A soil solidification material composed of recycled aggregate, steel slag, high-calcium fly ash, bioenzyme, inorganic and organic adsorbents, industrial waste gypsum, and an activator, which is prepared through a process involving microwave irradiation, pneumatic separation, and high-temperature calcination to enhance strength and environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional materials like cement and lime are used to stabilize soil, then the soil can be solidified, but the strength is low and strength reduces with water exposure
Solution Approach 1:
The patent uses a composite material system combining multiple solid waste components (steel slag, recycled aggregate, fly ash, gypsum) with bioenzymes and adsorbents. This composite approach creates synergistic effects where each component contributes different properties: steel slag and recycled aggregate provide structural strength, fly ash and gypsum enhance binding, while adsorbents improve water resistance. The combination resolves the contradiction by achieving both high strength and water stability that single materials cannot provide.
Solution Approach 2:
The patent transforms the chemical and physical parameters of solid waste materials through processing. Steel slag is ground to specific particle sizes (0.075-2.36mm), recycled aggregate is carbonized and ground (0.15-3.0mm), and materials are heated to activate bioenzymes. These parameter changes convert weak, water-sensitive raw materials into strong, water-resistant solidification components, directly addressing the strength and water resistance contradiction.
2Ease of manufacture
If simple treatment of raw materials like steel slag and waste concrete is used, then project cost is reduced, but solidification strength is low and soil contamination occurs
Solution Approach 1:
The patent applies preliminary treatment to solid waste materials before using them in soil solidification. Steel slag is ground and screened to specific particle sizes, recycled aggregate undergoes carbonization and grinding, and materials are pre-heated to activate bioenzymes. These preliminary actions transform raw, weak materials into processed, high-strength components while maintaining cost-effectiveness, resolving the contradiction between ease of manufacture and solidification strength.
Solution Approach 2:
The patent changes physical parameters of solid waste through systematic processing: particle size reduction through grinding and screening, temperature elevation through heating to activate bioenzymes, and chemical modification through carbonization. These parameter changes convert inexpensive, simple-to-obtain solid waste into high-strength solidification materials, achieving both ease of manufacture and high strength.
3Strength
If more cement and traditional materials are used to improve strength, then solidification strength increases, but project cost increases and natural materials become scarce
Solution Approach 1:
The patent recovers and reuses solid waste materials (steel slag, recycled aggregate, fly ash, gypsum) that would otherwise be discarded. These recovered materials are processed and applied to soil solidification, providing high strength while eliminating or reducing the need for cement and natural construction materials. This directly resolves the contradiction between achieving high strength and conserving natural resources.
Solution Approach 2:
The patent creates a composite solidification material using multiple solid waste components that together provide the strength normally requiring large amounts of cement. The synergistic combination of steel slag, recycled aggregate, fly ash, and gypsum in specific proportions achieves high strength with minimal or zero cement, resolving the contradiction between strength and material consumption.
4Adaptability or versatility
If solid waste materials are used without proper treatment, then project cost is reduced and waste utilization increases, but environmental pollution and soil contamination occur
Solution Approach 1:
The patent converts potentially harmful solid waste materials into beneficial soil solidification agents. Steel slag, recycled aggregate, fly ash, and gypsum are processed and combined with bioenzymes and adsorbents to create a material that not only solidifies soil but also adsorbs contaminants. This transforms waste that could cause pollution into a solution that prevents pollution, resolving the contradiction between waste utilization and environmental protection.
Solution Approach 2:
The patent introduces adsorbents (activated carbon, diatomite, attapulgite) as intermediaries between solid waste materials and soil. These adsorbents capture harmful substances and contaminants, preventing them from contaminating the soil while allowing the solid waste components to provide structural strength. This intermediary approach enables high waste utilization while preventing soil contamination.
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 material significantly improves the strength and durability of solidified soil, effectively adsorbs contaminants, and reduces environmental pollution and waste, while lowering project costs and maintenance requirements.
Implementation Method 1
performing a microwave irradiation treatment on the recycled aggregate for 15-24 min with a microwave power density of 1.714 W/cm2
Implementation Method 2
the microwave irradiation treatment heats the recycled aggregate instantaneously, so that a temperature difference is formed between the inside and the outside of the recycled aggregate; the strength of an attached cement slurry outside of the recycled aggregate decreases due to the high temperature
Implementation Method 3
grinding and carrying out pneumatic separation to obtain an active recycled aggregate and an inert recycled aggregate
Implementation Method 4
the bioenzyme 5-15 parts
Implementation Method 5
The inorganic adsorbent is diatomite and attapulgite. Diatomite and attapulgite are capable of absorbing organic matters in the soil
Implementation Method 6
high-temperature calcination to enhance strength and environmental sustainability
Data Source
AI summary
A soil solidification material based on solid waste and bioenzyme, and a preparation method thereof are disclosed. The soil solidification material is composed of the following components in parts by weight: recycled aggregate 22-35 parts, steel slag 20-30 parts, high-calcium fly ash 16-24 parts, the bioenzyme 5-15 parts, an inorganic adsorbent 10-18 parts, an organic adsorbent 8-20 parts, industrial waste gypsum 25-35 parts, an activator 20-30 parts, sodium citrate 1-3 parts, and slaked lime 0.02-0.2 parts. The present disclosure adopts the recycled aggregate, the steel slag, the industrial waste gypsum and the high-calcium fly ash as the main components of the soil solidification material to reduce the cost. The soil solidification material of the present disclosure prepared by optimizing the proportion is capable of significantly improving the engineering properties of the soil or the mixed contaminated soil, and has significant economic and environmental benefits.