Industrial waste can help stabilize cracking, swelling clay soil, but not forever
Qin L, Li J, Zha F, Xu L, Kang B
Soil Health
If your yard sits on heavy clay that swells when wet and cracks when dry, this research shows how the same wet-dry swings that split your soil also gradually break down even treated ground, which affects paths, raised-bed footings, and patio bases.
Clay soil swells when it's wet and shrinks when it's dry, which cracks foundations and roads. Researchers mixed a waste product from fertilizer manufacturing with lime and sodium silicate to firm it up, and the mix cut swelling by nearly half. Repeated soaking and drying still opened tiny cracks and weakened the treated soil over time.
Key Findings
LSP binder reduced the free swelling index of expansive soil from 58.6% to 32.1%.
After 15 drying-wetting cycles, unconfined compressive strength dropped by 26.5% and permeability rose 1.65-fold.
XRD and MIP analyses showed physical filling by phosphogypsum powder drove the improvement, while micro-crack growth drove the deterioration from wet-dry cycling.
chevron_right Technical Summary
A new soil binder made from phosphogypsum (an industrial waste product), lime, and sodium silicate makes swelling clay soil more stable and less prone to expansion. Repeated wet-dry cycles still weaken it over time, with strength dropping 26.5% after 15 cycles.
Abstract Preview
Original paper
Experimental study on the engineering performance of LSP stabilized expansive soil under cyclic drying-wetting condition.
Conventional binders to treat expansive soil commonly present challenges of high cost and significant environmental burdens. To address these limitations, this study proposes an environmentally sus...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Nanoplastics interfere with plant-mycorrhizal communication and limit plant growth.
Microplastics breaking down in your garden soil are quietly strangling the beneficial fungi that help your vegetables absorb phosphorus and other nutrients, ...
Climate adaptation in plants refers to the physiological and evolutionary mechanisms through which plants adjust to changing environmental conditions, including temperature shifts, altered precipitation patterns, and seasonal variations. Understanding these processes is essential for plant science
arrow_forward Explore topic