Valorisation of dune sand-tuff for Saharan pavement design

Daheur, Elhadj Guesmia; Li, Zhong-Sen; Demdoum, Abdellah; Taïbi, Saïd; Goual, Idriss

doi:10.1016/j.conbuildmat.2022.130239

Cited by 3 publications

(3 citation statements)

References 67 publications

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“…When both backfills possessed similar q u , the ε f of MSBS-PAC backfill material was lower than that of the MSBS backfill. E 50 is a deformation modulus that characterizes the ability of materials to resist elastic-plastic deformation, defined as the ratio of stress to strain when stress reaches half of the peak stress [41]. Figure 5c displays the relationship between E 50 and q u of different backfills.…”

Section: Unconfined Compressive Strength Strain At Failure and E 50mentioning

confidence: 99%

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Engineering Properties of Novel Vertical Cutoff Wall Backfills Composed of Alkali-Activated Slag, Polymer-Amended Bentonite and Sand

Jiang

Shi

et al. 2023

Polymers

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The workability, hydraulic conductivity, and mechanical properties are essential to contaminant containment performance of cementitious backfills in vertical cutoff walls at contaminated sites. This study aims to investigate the engineering properties of a novel vertical cutoff wall backfill composed of reactive magnesia (MgO)-activated ground granulated blast furnace slag (GGBS), sodium-activated calcium bentonite amended with polyacrylamide cellulose (PAC), and clean sand (referred to as MSBS-PAC). Backfills composed of MgO-activated GGBS, sodium-activated calcium bentonite, and clean sand (referred to as MSBS) were also tested for comparison purposes. A series of tests were conducted which included slump test, flexible-wall hydraulic conductivity test, and unconfined compression test. The pore size distributions of two types of backfills were investigated via the nuclear magnetic resonance (NMR) technique. The results showed the moisture content corresponding to the target slump height was higher for MSBS-PAC backfill than that for MSBS backfill. The MSBS-PAC backfill possessed lower pH, dry density, and higher void ratio at different standard curing times as compared to MSBS backfill. The unconfined compressive strength and strain at failure of the MSBS-PAC backfill were noticeable lower than those of the MSBS backfill. In contrast, the hydraulic conductivity of MSBS-PAC backfill was approximately one order of magnitude lower than that of the MSBS backfill, which was less than 10−9 m/s after 28-day and 90-day curing. Lower hydraulic conductivity of MSBS-PAC backfill was attributed to the improvement of pore structure and pore fluid environment by PAC amendment.

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Section: Unconfined Compressive Strength Strain At Failure and E 50mentioning

confidence: 99%

“…to resist elastic-plastic deformation, defined as the ratio of stress to strain when stress reaches half of the peak stress [41]. Figure 5c displays the relationship between E50 and qu of different backfills.…”

Section: Pore Size Distributionmentioning

confidence: 99%

Engineering Properties of Novel Vertical Cutoff Wall Backfills Composed of Alkali-Activated Slag, Polymer-Amended Bentonite and Sand

Jiang

Shi

et al. 2023

Polymers

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“…Several studies have focused on dune sands to initiate their identi cation, quanti cation, and geotechnical properties (Al-Taie et al, 2013) in order to evaluate their suitability as a construction material (Al-shakeri et al, 2017). Some studies have used the dune sand in road construction (Akacem et al, 2020, Daheur et al, 2023, as aggregate on concrete (Abdeldjalil & Yous , 2020), and in soil reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Comparison Behaviour of Dune Sand with Reference Sands Using Direct Shear Tests

Dehkordi,

Berga,

BOUDIA

2024

Preprint

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The rapid increase in sand consumption, in the road sector and in building construction, is such that serious supply problems are currently posed in some countries. These problems are all the more crucial as the dune sands (due to the quality and abundance in arid regions and the other desert areas). The main objective of this study is to determine the geotechnical properties of dune sand as local materials to reduce the price of building materials. Different dune sand samples were used and their physical, mechanical and chemical properties were also examined. The properties of the dune sand were compared with standard sands to show its ability and advantage. The results show that dune sand has geotechnical and mineralogical characteristics closest to Standard sand. Results can be used to improve the geotechnical properties of dune sand as building materials.

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Effect of silt fines on the undrained monotonic behavior of compacted tuff soil

Ezziane,

Henni,

Denine

et al. 2024

Arab J Geosci

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The present study explores the influence of silt content on the undrained monotonic behavior of compacted tuff. All undrained triaxial tests were performed at both relative densities Dr = 50 and 90% and compacted with the optimum water content on tuff soil mixed with silt in the range of 0 to 50%. Experimental results show that adding fines content (FC) up to 20% increases the resistance of dense compacted tuff (Dr = 90%) by about 35% for 100 kPa of confining pressure, and the addition of 10% silt fines results in a maximum increase of 15.71% in the medium dense state specimen (Dr = 50%). The deviator stress reveals a decrease by adding more than 20% of silt. Moreover, the soil cohesion was found to attain maximum values with the optimum silt percentage of FC = 10% for medium-density samples (Dr = 50%) and FC = 20% for dense samples (Dr = 90%), respectively. Finally, the study showed a direct correlation between the cohesion of the soil prepared in a dense state (Dr = 90%) and the soil’s maximum dry density (MDD). In particular, the maximum dry density corresponds to a higher cohesion.

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Valorisation of dune sand-tuff for Saharan pavement design

Cited by 3 publications

References 67 publications

Engineering Properties of Novel Vertical Cutoff Wall Backfills Composed of Alkali-Activated Slag, Polymer-Amended Bentonite and Sand

Engineering Properties of Novel Vertical Cutoff Wall Backfills Composed of Alkali-Activated Slag, Polymer-Amended Bentonite and Sand

Comparison Behaviour of Dune Sand with Reference Sands Using Direct Shear Tests

Effect of silt fines on the undrained monotonic behavior of compacted tuff soil

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