Durability of soil mix material subjected to wetting/drying cycles and external sulfate attacks

Helson, Olivier; Eslami, Javad; Beaucour, Anne-Lise; Noumowé, Albert; Gotteland, Philippe

doi:10.1016/j.conbuildmat.2018.10.095

Cited by 27 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Indeed, the alkaline activator used is mainly composed of sodium and aluminium hydroxides, while the acidic medium was obtained using sulfuric acid. Most likely, a combination of the these two factors was responsible for the formation of both superficial and internal cracks in the stabilised soil mass, leading to the premature collapse of the specimen [42,43]. hand, the formation of soluble sulphates inside this specimen is also possible, as a consequence of the interaction between the acidic medium and the composition of the cementitious 50FA50WG paste.…”

Section: Durability Of the Selected Soil-cement Combinationmentioning

confidence: 93%

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

et al. 2021

View full text Add to dashboard Cite

The development of alternative materials for the construction industry, based on different types of waste, is gaining significant importance in recent years. This is mostly due to the need to increase sustainability of this heavily polluting activity, thus mitigating the dependence on, for instance, Portland cement. The present paper is related to the development of an alkaline activated cement (AAC) exclusively fabricated from industrial by-products (both precursor and activator). Coal combustion fly ash, a common residue from thermoelectric powerplants, and glass waste, from the manufacture of ophthalmic lenses, were used as precursors. These precursors were activated with a recycled alkaline solution, resulting from the cleaning of aluminium extrusion dies, instead of the more common commercial reagents usually applied for this type of binder. Several pastes were studied, combining the precursor and alkaline solution in different proportions. When the most-performing cements were defined, they were used to stabilise a cohesive soil. The experimental procedure and subsequent analysis were designed based on a Response Surface Methodology model, considering the Activator/Solids and Soil/Precursor ratios as the most relevant variables of the stabilisation process. It was observed that, depending on the type of alkaline cement used, there was an optimum precursor and activator contents to optimise the mechanical properties of the stabilised soil. The reliability of this prediction was especially dependent on the type of precursors and, also, on their respective dissolution process right before the homogenization with the soil, under the working conditions available.

show abstract

Section: Durability Of the Selected Soil-cement Combinationmentioning

confidence: 93%

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Therefore, deionized water, 5% Na 2 SO 4 solution, 5% NaCl solution, and three dilute sulfuric acid solutions with pH values of 1.5, 3, and 5 were used as exposure solutions in this study. The drying-wetting test performed in this study was in accordance with the recommended method [11,27,28]. Firstly, the PG-based backfill specimens were dried in an oven at 40 °C for 48 h. Secondly, the specimens were submerged in different exposure solutions with a liquid/solid ratio of 5:1 for 24 h at an environment temperature of 20 °C.…”

Section: Drying-wetting Testmentioning

confidence: 99%

“…where p was the porosity of the specimen; was the saturated mass of the specimen after n cycles; and was the dry mass of the specimens after n cycles. Mass changes in the specimens The drying-wetting test performed in this study was in accordance with the recommended method [11,27,28]. Firstly, the PG-based backfill specimens were dried in an oven at 40 • C for 48 h. Secondly, the specimens were submerged in different exposure solutions with a liquid/solid ratio of 5:1 for 24 h at an environment temperature of 20 • C. The specimens were then exposed to 1, 3, 5, 10, 15, 21 and 30 drying-wetting cycles, with the leachate sampled after the specified number of cycles and filtered (0.22 µm) for subsequent chemical analysis.…”

Section: Porosity Measurementmentioning

confidence: 99%

“…However, after emplacement, the backfill is probably subject to unfavorable conditions during its long-term underground storage. Studies have shown that cementitious products can be damaged by high levels of salinity and acidity, leading to the expansion, cracking and even fracture of the hardened structure [10,11]. In the cement industry, factors affecting the evolution of mechanical properties have been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

“…In the cement industry, factors affecting the evolution of mechanical properties have been extensively investigated. Firstly, sulfate attack is considered as an important factor influencing the mechanical performance of cemented materials due to the formation of gypsum and ettringite [11][12][13][14][15]. Expansive ettringite results in volume expansion and eventual cracks [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Durability Evaluation of Phosphogypsum-Based Cemented Backfill Through Drying-Wetting Cycles

Zhou

et al. 2019

Minerals

View full text Add to dashboard Cite

In this study, the durability of phosphogypsum (PG)-based cemented backfill was investigated by drying-wetting cycles to explore deterioration of its strength and the release of impurities. The leachates in this test were composed of deionized water, 5% Na2SO4 solution, 5% NaCl solution, and a range of sulfuric acid solutions with pH values of 1.5, 3, and 5. After drying-wetting cycles, unconfined compressive strength (UCS), visual deterioration, porosity, microstructure and concentrations of phosphate and fluoride in the leachates were measured. The results showed that both saline and acidic solutions could lead to strength reduction of PG-based cemented backfill under different deterioration mechanisms. The mechanical damage of salinity was caused by micro-cracking and degradation of C–S–H. However, the H+ broke the backfill by dissolving hydration products, leaving the conjunctures between PG particles weakened. Furthermore, the environmental impact was investigated by measuring the concentration of phosphate and fluoride in the leachates. In acidic solutions, the release of phosphate and fluoride was greatly enhanced by H+. Compared to the great strength deterioration in saline leachates, the concentration of phosphate and fluoride were similar to that of deionized water, indicating that saline solutions had little impact on the release of hazardous impurities.

show abstract

Coupling effect of superfine zeolite and fiber on enhancing the long-term performance of stabilized/solidified Pb-contaminated clayey soils

Rozbahani

Goodarzi

Lajevardi

2022

Environ Sci Pollut Res

View full text Add to dashboard Cite

Durability of soil mix material subjected to wetting/drying cycles and external sulfate attacks

Cited by 27 publications

References 12 publications

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

Durability Evaluation of Phosphogypsum-Based Cemented Backfill Through Drying-Wetting Cycles

Coupling effect of superfine zeolite and fiber on enhancing the long-term performance of stabilized/solidified Pb-contaminated clayey soils

Contact Info

Product

Resources

About