GGBFS–Al³⁺ Composite Amendment

3× Faster Dewatering

Synergistic use of slag and aluminum salts enhances electro-osmotic dewatering and strength gain of bentonite slurry, enabling low-carbon solidification of waste slurry.

Ying, Zhang · Qiquan, Deng · Xue, Zhijia

Journal of Cleaner Production 2026

Specifications

Water content reduction (anode region)

{'zh': '26.9', 'en': '26.9'} %

Water content reduction (middle region)

{'zh': '67.5', 'en': '67.5'} %

Water content reduction (cathode region)

{'zh': '47.3', 'en': '47.3'} %

Shear strength increase (anode region)

{'zh': '177.7', 'en': '177.7'} %

Shear strength increase (middle region)

{'zh': '174.0', 'en': '174.0'} %

Shear strength increase (cathode region)

{'zh': '176.8', 'en': '176.8'} %

Advantages

Faster Dewatering

Aluminum ions weaken the electric double layer of bentonite particles, promoting effective drainage channels and synergistically enhancing drainage with GGBFS.

Strength Doubled

With 1% GGBFS and 2% ASO, shear strength increased by 174.0% in the middle region compared with untreated slurry.

Waste Treats Waste

Using GGBFS and aluminum salt as amendments offers a low-carbon, 'waste-controlled-by-waste' strategy for sustainable treatment.

Applications

• Shield Tunneling Waste Slurry Treatment：Directly treat bentonite waste slurry from shield tunneling, achieving low-cost solidification and dewatering.
• Soft Soil Solidification：Increase soft soil strength and reduce water content, improving engineering performance.
• Underground Engineering：Treat waste slurry generated in underground engineering, avoiding environmental pollution.
• Electro-osmotic Consolidation：Improve electro-osmotic dewatering efficiency and accelerate consolidation.