Effects of variations of voltage and pH value on the shear strength of soil and durability of different electrodes and piles during electrokinetic phenomenon

Sadeghian, Fatemeh; Jahandari, Soheil; Haddad, Abdolhosein; Rasekh, Haleh; Li, Jie

doi:10.1016/j.jrmge.2021.07.017

Cited by 26 publications

(19 citation statements)

References 49 publications

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“…In some previous research studies, it was reported that the water quality can also affect the mechanical properties of concrete and cementitious materials [ 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. Therefore, in the current investigation, distilled water was used for the characterization tests.…”

Section: Methodsmentioning

confidence: 99%

Properties of Lime-Cement Concrete Containing Various Amounts of Waste Tire Powder under Different Ground Moisture Conditions

et al. 2022

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Lime-cement concrete (LCC) is a non-structural concrete in which lime and cement are used as the main binders. However, although LCC has many applications in reducing the settlement of foundations and providing a support layer for shallow foundations, little research has been conducted to evaluate its behaviour in various moisture conditions. Previous researchers have studied the feasibility of using waste tires in conventional concrete to alleviate their negative environmental impacts. However, in field projects, rubber has not been widely used because its application leads to the strength reduction of concrete. In the case of LCC, attaining high strengths is not required and thus application of waste tire particles sounds reasonable. This research evaluated the impact of various rubber powder contents on the fresh, geotechnical and durability properties of LCC at different saturation degrees induced by the capillary action and groundwater level increment, which has not been studied before. The results of more than 320 tests showed that the application of tire powder increases workability and decreases the water absorption of LCC. Moreover, all 60-day cured specimens exposed to 100% saturation degree experienced a strength reduction of less than 10% by using rubber powder contents varying from 0 to 20%. Moreover, increasing the saturation degree from 0 to 100% decreased the average compressive strength by 13.5 and 22% for 60-day cured samples of two different mix designs. The results of this research confirm that LCC containing up to 10% rubber powder could be promisingly used underneath or close to the groundwater table without its strength and geotechnical properties being jeopardized due to rubber employment and/or exposure to ground moisture.

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Section: Methodsmentioning

confidence: 99%

Properties of Lime-Cement Concrete Containing Various Amounts of Waste Tire Powder under Different Ground Moisture Conditions

et al. 2022

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“…After that, coarse and fine aggregates were poured into the pan mixer and mixed for two minutes, then slag was added and mixed for another 2 min to have the homogeneity of the dry materials. Simultaneously, superplasticizer and extra water, which was tap water according to the authors’ previous research studies [ 45 , 46 , 47 , 48 , 49 ], were poured into the prepared alkaline liquid and thoroughly mixed with the help of a stirrer for 2 min to obtain a homogenous liquid component. Afterward, the liquid component was gradually added to dry materials, and mixing continued for approximately 4 min to achieve the uniform nature of concrete.…”

Section: Methodsmentioning

confidence: 99%

Optimized Alkali-Activated Slag-Based Concrete Reinforced with Recycled Tire Steel Fiber

et al. 2022

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This study employed Taguchi-Grey relational analysis to optimize the influences of binder content, the molarity of sodium hydroxide (SH) solution, alkaline solution to binder content (Al/Bi) ratio, water to alkali-activated solids (W/S) ratio, and sodium silicate to sodium hydroxide solution (SS/SH) ratio on the workability, setting time, and compressive strength of alkali-activated slag-based concrete (AASC). Then, the recycled tire steel fibers (RTSF) were introduced into the optimized mixture in different dosages, and the physical and mechanical properties of fiber-reinforced AASC (FR-AASC) were evaluated. RTSF inclusion negatively affected the workability and increased the density while slightly reducing the water absorption. Additionally, the compressive strength and flexural behavior of FR-AASC improved by increasing the RTSF content. The analysis of images taken from flexural specimens through the Digital Image Correlation technique (DIC) revealed that higher RTSF dosage caused a curved macro crack with several branches alongside, leading to a better post-cracking performance in terms of strength and toughness.

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“…The water quality used to make concrete specimens has a significant impact on concrete strength properties [56][57][58][59]. Therefore, distilled water was utilised for the characterisation tests and tap water for moulding the specimens [60][61][62][63][64][65][66][67][68][69]. Furthermore, the workability of the concrete mixtures was adjusted by using a Sika HRF-2 superplasticiser.…”

Section: Raw Materialsmentioning

confidence: 99%

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

et al. 2021

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In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.

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Effects of variations of voltage and pH value on the shear strength of soil and durability of different electrodes and piles during electrokinetic phenomenon

Cited by 26 publications

References 49 publications

Properties of Lime-Cement Concrete Containing Various Amounts of Waste Tire Powder under Different Ground Moisture Conditions

Properties of Lime-Cement Concrete Containing Various Amounts of Waste Tire Powder under Different Ground Moisture Conditions

Optimized Alkali-Activated Slag-Based Concrete Reinforced with Recycled Tire Steel Fiber

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

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