Mechanical and durability properties of a soil stabilised with an alkali-activated cement

Rı́os, Sara; Ramos, Catarina; Fonseca, António Viana da; Cruz, Nuno; Rodrigues, Carlos

doi:10.1080/19648189.2016.1275987

Cited by 71 publications

(29 citation statements)

References 38 publications

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“…Rios et al [6] studied silty sand stabilised with an AAB from low calcium fly ash activated by alkaline solution mixture of sodium silicate and sodium hydroxide. In this research, ambient curing were used for the treated soils up to 360 days.…”

Section: Previous Studies On Soil Treated With Alkali-activated Bindermentioning

confidence: 99%

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Using Alkali-Activated Binders to Improve UAE Dune Sand

Arab¹,

Junaid²,

Omar³

et al. 2019

World Congress on Civil, Structural, and Environmental Engineering

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Soil improvement is a technique that improves the soil engineering properties. Several chemical and mechanical techniques have been developed over the last decades to alter or improve poor soil conditions. Many of these chemical techniques use either cement or lime. These traditional techniques have proven efficiency and durability over many years of use despite environmental concerns. Alkali-activated binders (AABs) have shown potential for low energy, low cost and high strength alternative to these traditional cementitious materials. A preliminary study was conducted on the feasibility of using alkali activated mixture of fly ash and Groundgranulated blast-furnace slag (GGBFS) to stabilize local dune-sands. Several micro-and macro-characterization techniques are used to examine the suitability of these binders to improve these local soils. Two different precursors are employed as activators in this investigation namely sodium silicate solution (Na2SiO3) and sodium hydroxide (NaOH). The factors studied for the geopolymerization process were Na2SiO3/NaOH ratio, total ratio of activator solids by sand weight, and finally ratio of fly ash to GGBFS. The tested specimens were cured temperature of 45 degree Celsius for 24 hours to replicate UAE environmental condition. A maximum strength of 3.68 MPa was attained after 14 days of curing for mixture with a ratio of Na2SiO3/NaOH equal to 1 and 40%:60% of fly ash to GGBFS. The total binder to soil ratio for this mixture was 15% by weight.

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Section: Previous Studies On Soil Treated With Alkali-activated Bindermentioning

confidence: 99%

“…One such challenge is the dependency of the properties of these binders on the pre-cursor source and the activation system. Several studies on the mechanical behaviour of heat cured AAM are available in the literature [2][3][4][5][6][7][8][9][10][11][12]. However, ambient cured AAM is preferable especially for soil improvement techniques.…”

Section: Introductionmentioning

confidence: 99%

Using Alkali-Activated Binders to Improve UAE Dune Sand

Arab¹,

Junaid²,

Omar³

et al. 2019

World Congress on Civil, Structural, and Environmental Engineering

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show abstract

“…However, the addition of calcium containing compounds such as blast furnace slag to geopolymer promotes ambient temperature setting [4], making geopolymer more applicable for bulk application in soil stabilization [5]. Depending on the treatment conditions (i.e., geopolymer ingredients, concentration of geopolymer components, and curing time), geopolymer-treated soils have been reported to provide an increase in unconfined peak strength and a reduction in the corresponding strain [6][7][8][9]. However, to advance the use of geopolymer for ground improvement, an in-depth investigation into understanding the geo-mechanical characteristics of geopolymer-treated soils is required, considering the effects of parameters such as the confining pressure and excess pore water pressure under drained/undrained conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of such parameters for classical binders have been extensively investigated and well documented in the literature [e.g., 10,11]. However, similar investigations are limited for geopolymer-treated soils and the available studies are mainly focused on treatment of sand [e.g., 6,12]. In this paper, a comprehensive study is carried out to investigate the geo-mechanical characteristics of geopolymer-treated (natural) clay based on triaxial experimental tests under undrained condition.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of Clay Stabilized with Fly-ash Based Geopolymer Incorporating Granulated Slag

Abdullah¹,

Shahin²

2019

World Congress on Civil, Structural, and Environmental Engineering

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The use of traditional binders (e.g., lime or cement) in soil stabilization faces many obstacles of environmental nature, and geopolymers have been recently become an attractive alternative binder that may overpasses such obstacles. However, the literature lacks detailed information in relation to the geo-mechanical characteristics of geopolymer-stabilized soils and this paper fills in part of this gap. The paper presents an evaluation of the stress-strain behavior of two natural clays of different mineralogy treated with fly-ash based geopolymer. Laboratory experiments were performed including the Unconfined Compressive Strength (UCS) tests and Consolidated Undrained (CU) triaxial tests under different confining pressures. The results indicate that the addition of geopolymer increases the strength and stiffness of clay, which contributes to higher uniaxial and triaxial peak stresses. The confining pressure was found to have a considerable influence on the stress-strain behavior and excess pore-water pressure obtained from the CU tests. The results also demonstrate that clay mineralogy is an important factor that affects the stress-strain performance of geopolymer-treated clay.

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“…decomposed gradually and the internal structure of solidified soil changes under dry-wet cycling and sulfuric acid corrosion [10,11], which future results in the change of soil strength and deformation characteristics [12][13][14].…”

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confidence: 99%

Experimental Study on Stress and Strain Characteristics of Solidified Clay under Seawater Condition

Cai

et al. 2019

MATEC Web Conf.

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This paper presents the results of a laboratory study on the stress-strain relationship of solidified clay formed in seawater corrosion condition. An automatic triaxial apparatus was used and the axial stress and strain was monitored continuously. The dry density was 1.0g/cm3, the cement contents were 4, 6, 8 and 10% by weight of dry soil particles, and the curing time was 28, 60 and 90 days respectively. Test results indicate that the stress strain relationship of cemented clay was affected by soil density, cement content and curing period. A behaviour of strain hardening to strain softening occurred with the increase of cement content. Strong structure will form in cemented clay when the admixture content is 10% or more. The increase in strength of the solidified foundation is resulted from the increase in internal friction angle and cohesive force. The cohesive force increases obviously with the increase of the cement content and the curing age, but the change of internal friction angle is not pronounced after reaching a certain value.

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Mechanical and durability properties of a soil stabilised with an alkali-activated cement

Cited by 71 publications

References 38 publications

Using Alkali-Activated Binders to Improve UAE Dune Sand

Using Alkali-Activated Binders to Improve UAE Dune Sand

Strength Characteristics of Clay Stabilized with Fly-ash Based Geopolymer Incorporating Granulated Slag

Experimental Study on Stress and Strain Characteristics of Solidified Clay under Seawater Condition

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