State-of-the-Art Review on the Role of Fly Ashes in Geotechnical and Geoenvironmental Applications

Moghal, Arif Ali Baig

doi:10.1061/(asce)mt.1943-5533.0001897

Cited by 64 publications

(32 citation statements)

References 144 publications

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“…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%

“…Variety of research works have addressed the feasibility of introducing the aforesaid binder to remediate problematic soils. Their results drawn confirmed high stiffness and durability of treated soft soils [7][8][9][10][11][12][13][14][15]. Though, the alkaline activator used by the above mentioned trials was either Sodium hydroxide, a mix of Sodium hydroxide and Sodium silicate or a mix of Potassium hydroxide and Potassium silicate.…”

Section: Introductionmentioning

confidence: 69%

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Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

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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.

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Section: Microstructural Analysessupporting

confidence: 92%

Section: Microstructuralsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 69%

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Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

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“…Cement and lime are two conventional constructional material used as binders to stabilize different soils. Some other nonconventional materials such as industrial wastes, fly ash, bottom ash, pond ash, silica fume, ground granulated blast furnace and rice husk ash (RHA) have also been used for such purposes [5][6][7][8][9]. The main role of such binders is initiation of hydration reactions and formation of calcium silicate hydrated (CSH) gel [10].…”

Section: Introductionmentioning

confidence: 99%

“…Also, the direct relationship between the length of PP and UCS is clearly observed. In addition, Sand + C + RHA Clay + 20% Sand + C + RHA + PP(6)…”

mentioning

confidence: 99%

Evaluation of Strength behaviour of Cement-RHA Stabilized and Polypropylene Fiber Reinforced Clay-Sand Mixtures

Ghorbani

Salimzadehshooiili

2018

Civ Eng J

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In this paper, regarding the high availability of rice husk ash (RHA) in Guilan province, also, to decrease the geo-environmental issues caused by dumping RHA in the environment, different clay-sand mixtures are stabilized using the combination of cement and RHA. Polypropylene (PP) fibers are also used to decrease the growth of tensile cracks and increase the overall strength of samples. As the main scope, effect of sand content (in different conditions: with and without presence of RHA) on the compressive strength of stabilized and reinforced samples is investigated. In this regard, 28 day cured clay-sand samples are prepared and unconfined compressive strength (UCS) tests are conducted and the results are compared. It is obtained that with addition of 20% sand to the clay samples, their UCS increases in both cases of non-RHA and RHA-stabilized samples. Moreover, such behavior has been observed with the length of studied PP fibers. As the second scope, based on the conducted UCS tests on the 7-, 28- and 90- day cured clay samples, compressive strength of non-RHA samples are almost completely achieved in a 28-day curing period, while samples containing RHA continue to strengthening after such a period toward a 90-day curing period. Next, a simple relationship for the prediction of UCS of cement-RHA stabilized and PP reinforced clay is presented based on the evolutionary polynomial regression (EPR) technique. This relationship can be efficiently applied by construction engineers to obtain the appropriate mixture design for the stabilization of clay with cement, RHA and PP fibers.

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