Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay

CHEN Rui; CHEN Hai; BAO Wei-xing; LAI Hong-peng

doi:10.19818/j.cnki.1671-1637.2023.04.009

Volume 23 Issue 4

Aug. 2023

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Article Navigation > Journal of Traffic and Transportation Engineering > 2023 > 23(4): 128-141

CHEN Rui, CHEN Hai, BAO Wei-xing, LAI Hong-peng. Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 128-141. doi: 10.19818/j.cnki.1671-1637.2023.04.009

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CHEN Rui, CHEN Hai, BAO Wei-xing, LAI Hong-peng. Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 128-141. doi: 10.19818/j.cnki.1671-1637.2023.04.009

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Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay

doi: 10.19818/j.cnki.1671-1637.2023.04.009

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 51708041

Natural Science Foundation of Shaanxi Province 2022JM-228

Fundamental Research Funds for the Central Universities 300102210213

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Author Bio:
CHEN Rui(1987-), male, associate professor, PhD, rchenua@chd.edu.cn
Received Date: 2023-03-02
Available Online: 2023-09-08
Publish Date: 2023-08-25

Abstract

Abstract

In order to study the water retention capacity of geopolymer stabilized aeolian sand with clay, the geopolymer was used to stabilize the aeolian sand with clay. Based on the pressure plate instrument method, the volume water contents under different matric suctions were measured, and the soil-water characteristic curves (SWCC) of stabilized aeolian sand were drawn and fitted. The effects of clay content, geopolymer content, curing time, and fiber length on the water retention capacity and fitting parameters of stabilized aeolian sand were studied. Research results show that with the increase in the clay content from 20% to 30%, the volume water content of aeolian sand sample under the same suction increases by about 3%, and the water retention capacity increases significantly. With the increase in the geopolymer content from 8% to 12%, the SWCCs of stabilized aeolian sand with 20% and 30% clay show an overall upward-moving trend, and the corresponding volume water contents with 10 kPa suction increase by 7.0% and 5.9%, and the corresponding volume water contents with 600 kPa suction increase by 4.3% and 4.2%, respectively. However, the extension of curing time has little effect on the improvement of the water retention capacity of stabilized aeolian sand, and the change range of volume water content is less than 1%. Basalt fiber with a length of 6 mm can barely improve the water retention capacity of stabilized aeolian sand. But increasing the fiber length to 12 mm slightly decreases the water retention capacity of stabilized aeolian sand, and the change ranges of both are less than 1%. The SWCC of stabilized aeolian sand with clay has two steep drop sections, which can be fitted by the multi-segment Van Genuchten model. The bimodal fitting parameters can reflect the distributions of large and small pores of the samples. Clay can only affect the parameters of large pores, while the geopolymer can affect the parameters of large and small pores. The scanning electron microscope and the mercury intrusion porosimetry test results show that the filling effects of geopolymer gel and clay reduce the porosity of soil samples. The overall pore volume in the stabilized aeolian sand varies slightly after the geopolymer is added. However, parts of the large pores change into small pores, the peak density of large pores decreases from 0.45 mL·g^-1 to 0.22 mL·g^-1, the peak density of micro pores increases from 0.02 mL·g^-1 to 0.05 mL·g^-1, and the average pore size decreases. The cementation of geopolymer leads to the formation of aggregates in the soil, which encapsulates some of the free water and prevents the water loss, improving the overall water retention capacity of stabilized aeolian sand.
- subgrade engineering,
- aeolian sand subgrade,
- soil-water characteristic curve,
- geopolymer,
- clay content,
- basalt fiber

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References(41)

References

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Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay

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Soil-water characteristic curve of geopolymer stabilized aeolian sand with clay

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