Building Gypsum Powder Emerges as Sustainable Solution for Stabilizing Environmentally Compromised Red Soil

New research proves building gypsum powder enhances red soil strength, offering a sustainable fix for landslides and engineering instability in red soil regions.

By: AXL Media

Published: Mar 30, 2026, 10:26 AM EDT

Source: Information for this report was sourced from Civil Engineering Sciences

Addressing the Engineering Instability of Dispersive Red Soils

Red soil regions are frequently plagued by geological hazards, including landslides and debris flows, due to the soil's inherent dispersibility and rapid loss of strength when saturated. To combat these engineering challenges, researchers have turned to building gypsum powder—a cost-effective and environmentally friendly modifier derived from construction waste. By integrating this industrial by-product into the soil matrix, engineers can simultaneously reduce the environmental burden of landfills and achieve high-performance soil stabilization. This modification process aims to refine the macroscopic mechanical theory of red soil, providing a scientific basis for disaster prevention in vulnerable geographic zones.

The Impact of Chemical Contaminants on Soil Integrity

The study systematically explored how various chemical pollutants influence the performance of gypsum-improved red soil under the stress of environmental cycling. Professor Yin-Lei Sun and his team found that the soil's mechanical properties—including cohesion and internal friction angle—vary significantly depending on the type of chemical exposure. For instance, acetic acid was found to be particularly detrimental, as it leads to the dissolution of the gypsum components. This chemical reaction initiates rapid pore development within the soil structure, which substantially compromises the overall shear and compressive strength of the engineering material.

Crystallization and Colloidal Mechanisms in Soil Reinforcement

In contrast to the corrosive effects of acid, other chemicals showed complex or even beneficial interactions at specific concentrations. Low concentrations of sodium sulfate were observed to crystallize within the soil, effectively filling microscopic pores and augmenting structural strength. However, the researchers warned that high-capacity crystallization can lead to unintended expansion and structural damage. Conversely, sodium hydroxide was found to trigger the thickening of the double electric layer and promote colloid precipitation. This process cements the soil skeleton together, creating a robust shield that mitigates the erosive effects typically caused by repeated dry-wet cycles.