Collapsibility potential of gypseous soil stabilized with fly ash geopolymer; characterization and assessment

Alsafi, Shaymaa; Farzadnia, Nima; Asadi, Afshin; Huat, Bujang Kim

doi:10.1016/j.conbuildmat.2017.01.079

Cited by 68 publications

(20 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At between higher wave numbers of 1600 cm -1 ,1751 cm -1 and 2762 cm -1 , 4000 cm -1 for both of S1F and S1FR two main broad peaks of 1651 cm -1 and 3622 cm -1 with low intensities of 2% were observed indicating stretching and deformation vibrations of OH and H-O-H groups from the weakly bound water molecules, which were adsorbed on the surface or trapped in the cavities between the framework bonds of the activated specimen. These observations were similar to those reported by plenty of researchers [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Microstructural Analysessupporting

confidence: 92%

“…A strength increment rate of 1900% for specimen cured for 28 days was observed attaining a strength value of 3680 kPa for KSF40 followed by KSF30 with a UCS value at 2830 kPa, while the KSF10, KSF20 were exhibiting less UCS values at 1705 kPa, 1929 kPa respectively. This finding is in a line with results drawn by compressive testes carried out by many researches [15][16][17][18] who reached a conclusion that a proportional coloration between fly ash content and compressive strength values was recorded, which was attributed to the vitreous silica and alumina present in the precursor.…”

Section: Microstructuralsupporting

confidence: 91%

“…Soil fly ash mixtures having a fly ash solid ratio of 10%, 20%, 30% and 40% are compacted in a stain steel compaction mold with 50mm diameter and 100mm height at their MDD, OMC to be later examined on unconfined compressive strength [8]. Potassium hydroxide is added to the soil fly ash mixtures at fixed molarity of 12 [17]. After compaction the specimen is extracted than covered with polyethylene folia to prevent moisture loss and stored for two different curing regimes of 7 & 28 days.…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

See 2 more Smart Citations

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

View full text Add to dashboard Cite

In this paper the potential of introducing alkali activated fly ash to a clayey soil as stabilizing agent was investigated. As alkaline activator Potassium hydroxide of 12 M was introduced to the soil fly ash mixtures. Unconfined compressive strength tests were carried out. Four different fly ash/solid ratios were proposed to be 10 %, 20 %, 30 % and 40 % at two curing regimes of 7 & 28 days. The highest unconfined compressive strength was of 40 % mixture recorded at 3.68 MPa after 28 days. Alkaline activation of clayey soil using KOH solution as an activator proved to be a feasible alternative for soft soil stabilization.

show abstract

Section: Microstructural Analysessupporting

confidence: 92%

Section: Microstructuralsupporting

confidence: 91%

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

See 1 more Smart Citation

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

View full text Add to dashboard Cite

show abstract

“…This is attributed to the fact that the slow dissolution of Class F FA ultimately allows more time for the formation of a well-defined 3D structural bonding, responsible for the higher long-term strength gain reported (Cristelo et al [12]). Alsafi et al [18] and Liu et al [19] showed that soils stabilized with potassium hydroxide (KOH) activated Class F FA produced a higher degree of polymerization and compressive strength as compared to Class F FA samples activated using sodium hydroxide (NaOH) solution. Alsafi et al [18] stated that the advantage of KOH over NaOH was due to the K+ cation being larger in size as compared to Na+ cation which led to a significant increase in the degree of polymerization.…”

Section: Geopolymer Stabilizationmentioning

confidence: 99%

Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Jayawardane

Anggraini

Li-Shen

et al. 2020

Int. J. of Geosynth. and Ground Eng.

View full text Add to dashboard Cite

Soils in their natural form are often deemed unsatisfactory to be directly used as a construction material for their respective applications. Under such circumtances, employment of ground improvement techniques to better suit the soil for its function is typically the most economical approach. Consequently, the present research investigated into the beneficial effect of modernized soil treatment techniques, i.e., geopolymer stabilization using fly ash as the precursor and geotextile reinforcement, on the strength enhancement of natural residual soil. A series of unconsolidated undrained (UU) triaxial compression tests were carried out to assess variation of geopolymer stabilized residual soil strength based on the varying number of geotextile layers, geotextile arrangement, and confining pressures. It was found that the increase in the number of geotextile layers resulted in a corresponding rise in soil strength and stiffness. It was also discovered that placement of geotextile layers at sample regions which suffered the maximum tensile stress-strain during loading was more effective compared to random placement. Soil strength was observed to reduce with increasing confining pressure which demonstrated the effectiveness of utilizing geotextile reinforcement at greater depths below the ground to be less. Failure patterns showed that while unreinforced soil resulted in failure along a shear plane at an approximate angle of 45 + φ/2 (φ: angle of internal friction), reinforced samples demonstrated a bulging failure where the soil between adjacent layers of geotextiles appeared to bulge. The findings deemed the employment of geopolymer stabilization and geotextile reinforcement on natural residual soil very effective with regards to the enhancement of soil strength and stiffness.

show abstract

“…Given its pozzolanic properties, FA has been successfully used as an effective agent for chemical and mechanical stabilization of loess through modifying the particle size distribution, enhancement in bonding strength between particles, and destruction of its open structure [48,49]. Therefore, FA can improve soil density and plasticity and reduce water content and strength performance of loess; thus, FA has been used in treating loess soils by many researchers in recent years [50][51][52][53][54]. For example, Prabakar et al (2003) studied the influence of FA on strength behavior of three different types of soil by using different percentages of FA from 9% to 46% by weight of the soil [55].…”

Section: Introductionmentioning

confidence: 99%

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Phoak

Luo

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

In this study, the influence of fly ash (FA) content (0%, 10%, 20%, and 30%) on the alteration in the physical and mechanical parameters of loess is investigated. The influences of curing time (0, 14, and 28 days) and submergence and non-submergence conditions are analyzed as well. Analysis considers the variation in Atterberg limits (liquid limit, plastic limit, and plasticity index), compaction parameters (optimum moisture content (OMC), and maximum dry density (MDD)), unconfined compressive strength (UCS) stress, UCS strain, California bearing ratio (CBR) value, and swell potential. Results show that the application of FA-stabilized loess (FASL) is effective. Specifically, the MDD decreases and the OMC increases, the UCS stress increases and the UCS strain decreases, the CBR value improves and the swell potential declines, but Atterberg limits are insignificantly changed by the increase in the FA ratio compared with those of untreated loess. The UCS stress and CBR value are improved with the increase in curing time, whereas the UCS strain is negligible. FASL under submergence condition plays an important role in improving the effect of FA on the UCS stress and CBR value compared with that under non-submergence condition. The UCS stress and CBR value are more increased and more decreased than the UCS strain in submerged samples. Therefore, the application of FASL in flood areas is important for obtaining sustainable construction materials and ensuring environmental protection.

show abstract

Collapsibility potential of gypseous soil stabilized with fly ash geopolymer; characterization and assessment

Cited by 68 publications

References 43 publications

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Contact Info

Product

Resources

About