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Swelling suppressing by using polypropylene fibre as reinforcement in natural pozzolana-lime-stabilised expansive grey clayey soil artificially contaminated by sulphates

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Abstract

The present paper aims to assess the free swell potential behaviour using polypropylene fibre (PF) as reinforcement in natural pozzolana-lime-stabilised expansive grey clayey soil (GS) artificially contaminated by sodium and calcium sulphates. For this purpose, lime (8%), natural pozzolana (NP: 20%) and PF (0–3%) by dry weight of soil were used in this study. The GS was artificially contaminated by different sulphate contents (0–6% by dry weight of soil) and the swell potential was assessed at different curing periods (1–120 days). A series of X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests were carried out to observe the changes in the mineralogy and microstructure of the GS, respectively. The obtained results showed that adding 8%lime alone or combined with 20%NP into the GS reduced the swell potential. In all cases, the swell potential increased with an increase in PF content up to 2% (optimum dosage) and then decreased beyond this value. The inclusion of 2%PF in lime-stabilised GS helps to transfer the stress from GS to PF due to the bonding between PF and modified GS particles. However, the inclusion of more than 2%PF forms lumps and adheres to each other; thus, there may be a deficiency in the contact between GS and PF, which is responsible for the reduction of friction coefficient and hence increasing the swell potential. On the other hand, the calcium sulphate showed a positive effect on the GS where the swell potential decreased as the calcium sulphate content and curing period increased due to the formation of cementing agents observed in XRD and SEM results. The adverse effect of the expansive ettringite mineral on the swell potential due to the sodium sulphate contamination was entirely suppressed when using the combination of 2%PF and 20%NP in lime-stabilised GS.

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Abbreviations

GS:

Grey soil

RS:

Red soil

CH:

Clay of high plasticity

CL:

Clay of low plasticity

L:

Lime

NP:

Natural pozzolana

Na2SO4 :

Sodium sulphate (Na)

CaSO4·2H2O:

Calcium sulphate (Ca)

OMC:

Optimum moisture content

MDD:

Maximum dry density

UCS:

Unconfined compressive strength

LL:

Liquid limit

PL:

Plastic limit

PI:

Plasticity Index

WBCSD:

World business council for sustainable development

ASTM:

American society for testing and materials

USCS:

Unified soil classification system

GGBFS:

Ground granulated blast furnace slag

C3A:

Cement tricalcium aluminate

XRD:

X-ray diffraction

SM :

Soil mixture

C‒S‒H:

Calcium silicates hydrates

C‒A‒H:

Calcium aluminates hydrates

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Acknowledgements

This research was funded by the General Directorate for Scientific Research and Technological Development (DGRSDT) of the Algerian Minister of Higher Education and Scientific Research.

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HG wrote the initial draft of the manuscript under the supervision of BM. All authors developed the ideas and frameworks for the manuscript. All authors read and approved this version of the manuscript.

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Correspondence to Hamid Gadouri.

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The authors of the manuscript confirm that there are no conflicts of interest regarding its publication. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

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This study does not involve any experiments on animals.

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Meziani, B., Gadouri, H. Swelling suppressing by using polypropylene fibre as reinforcement in natural pozzolana-lime-stabilised expansive grey clayey soil artificially contaminated by sulphates. Multiscale and Multidiscip. Model. Exp. and Des. 6, 477–504 (2023). https://doi.org/10.1007/s41939-023-00157-w

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  • DOI: https://doi.org/10.1007/s41939-023-00157-w

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