Erosion control performance of geotextiles treated with alkali-activated binder reinforced slope
LI Lihua1, ZHANG Yongshuai1, WAN Juan1*, LIU Gang1, ZHANG Xin2, XIONG Haowen2
(1. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, School of Civil Engineering, Architecture and the Environment, Hubei University of Technology, Wuhan, Hubei 430068, China;
2. China Construction Third Engineering Group (Shenzhen) Co. Ltd., Shenzhen, Guangdong 518000, China)
Abstract：Soil erosion is a global environmental issue that can trigger disasters. This study evaluated the effectiveness of alkali-activated binder (AAB) treatment on the performance of natural geotextiles (coir mats and straw mats) in controlling slope erosion through field-based artificial rainfall experiments. The results demonstrated that AAB treatment significantly improved the microstructure and mechanical properties of the geotextiles. The tensile strength of AAB-treated coir mats increased by 20%, with an elongation at break of 54.6%. Under a rainfall intensity of 120 mm/h and a slope gradient of 1:1, AAB-treated coir mats reduced the peak runoff rate by 70% and the peak erosion rate by 8.8% compared to bare slopes. High-intensity rainfall drives rapid yet spatially heterogeneous water movement. While the 1:1.75 gradient enhances infiltration depth and soil moisture uniformity, the 1:1 slope induces surface runoff, resulting in maximum water accumulation at the slope base. Alkali-activation reactions in AAB-functionalized geosynthetics produce cementitious phases that refine pore networks, increasing the stabilized water content of slope soils by 10% to 15%. These microstructural modifications concurrently enhance moisture retention capacity and erosion resistance in vegetated slope systems.
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2026, Vol. 45 
