Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Horpibulsuk, Suksun; Rachan, Runglawan; Raksachon, Yuttana

doi:10.3208/sandf.49.85

Cited by 223 publications

(80 citation statements)

References 33 publications

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“…The higher the W/B, the lower the strength is 13,15,16 . This result is the same as that of the cement stabilized clay 3,14 . Fig.…”

Section: Methodssupporting

confidence: 77%

“…The stabilization of clayey soils by CaCl 2 and fly ash (FA) reduces the plastic index and improves the workability 2 . The optimum proportion of fly ash definitely takes part in the improvement of strength and compressibility 3 . Fly ash disperses large clay-cement clusters formed due to physicochemical interaction into smaller clusters, hence increasing the surface reaction for hydration and pozzolanic reactions and producing larger amount of cementitious products.…”

Section: Introductionmentioning

confidence: 99%

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Strength and microstructure development in Bangkok clay stabilized with calcium carbide residue and biomass ash

Vichan¹,

Rachan²,

Horpibulsuk³

2013

ScienceAsia

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A mixture of biomass ash (BA) and calcium carbide residual (CCR) was used as a cementing agent for stabilization of soft Bangkok clay. The improvement in unconfined compressive strength of stabilized clay depends on the initial soil water content, binder content (B), CCR:BA ratio, and curing time. The strength improvement can be classified into two zones: active and inert. In the active zone (B = 5-15%), the Ca(OH) 2 content from the CCR is high and there are insufficient natural pozzolanic materials in the clay for the reaction. The input of BA increases the SiO2 content and induces the strength development. In the inert zone, (high binder content, B > 15%), the free lime causes unsoundness and results in insignificant strength development. The hydration products from the pozzolanic reaction (ettringite and a calcium aluminate silicate hydrate compound, gismondine) are identified by microstructural analysis via X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray spectroscopy (SEM with EDS), and X-ray fluorescence. SEM images show the compact morphology of the stabilized clay as the result of the increase in curing time and binder content. Over time, the cementitious products fill in the pore space, causing denser morphology and higher cementation bond strength between the clay clusters. The clay stabilized by XRD showed no reduction in the intensity of the reflection of the both quartz and kaolinite throughout the curing times. This implies that the amorphous silica from the glass of the BA is more reactive in dissolution in the CCR than the crystalline phase of quartz and kaolin in clay.

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“…The higher the W/B, the lower the strength is 13,15,16 . This result is the same as that of the cement stabilized clay 3,14 . Fig.…”

Section: Methodssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Strength and microstructure development in Bangkok clay stabilized with calcium carbide residue and biomass ash

Vichan¹,

Rachan²,

Horpibulsuk³

2013

ScienceAsia

Self Cite

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“…It is valid for the range of curing time between 3 and 180 days in which the usual service time of deep mixing column is within 30 days. This relationship is close to that proposed for cement admixed Ariake clay (Horpibulsuk et al, 2003) and for cement stabilized silty clay (Horpibulsuk et al, 2009). The generalized interrelationship among strength, curing time, and wc/C for predicting the laboratory strength development in the cement admixed Bangkok clay at LI ＝1 to 2 for wc/C ranging from 2.5 to 15 is obtained by combining Eqs.…”

Section: Laboratory Test Resultssupporting

confidence: 64%

Strength Development in Cement Admixed Bangkok Clay: Laboratory and Field Investigations

Horpibulsk

Rachan

Suddeepong

et al. 2011

Soils and Foundations

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207

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The in-situ deep mixing technique has been established as an eŠective means to eŠect columnar inclusions into soft Bangkok clay to enhance bearing capacity and reduce settlement. In this paper, an attempt is made to identify the critical factors governing the strength development in cement admixed Bangkok clay in both the laboratory and theˆeld. It is found that clay-water/cement ratio, wc/C is the prime parameter controlling the laboratory strength development when the liquidity index varies between 1 and 2. Based on this parameter and Abrams' law, the strength prediction equation for various curing times and combinations of clay water content and cement content is proposed and veriˆed. This will help minimize the number of trials necessary to arrive at the quantity of cement to be admixed. Besides the wc/C, the strength of deep mixing column is controlled by the execution and curing conditions. For low strength improvement (laboratory 28-day strength less than 1,500 kPa), theˆeld strength of the deep mixing columns, quf, made up from both dry and wet mixing methods is higher than 0.6 times the laboratory strength, qul. The quf/qul ratios for the wet mixing columns are generally higher than those for the dry mixing columns. This higher strength ratio is due to the dissipation of the excess water in the column (consolidation) caused by theˆeld stress. The water to cement ratio, W/C, of 1.0 is recommended for the wet mixing method of the soft Bangkok clay. A fast installation rate was shown to provide high quality for low strength columns. Suggestions are made for improving the deep mixing of soft Bangkok clay, which are very useful both from economic and engineering viewpoints.

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“…Trata-se dos fenômenos de coesão, de dispersão das partículas de solo, de fluidez, de homogeneidade, de exsudação e de segregação que são próprios a um comportamento auto-adensável. Horpibulsuk (2009) observou, a partir da microestrutura e dos resultados dos ensaios de resistência, que a reatividade pozolânica da cinza volante é mínima no solo-cimento, diferentemente dos resultados obtidos na tecnologia do concreto, concluindo que isso pudesse ser devido a uma menor quantidade de Ca(OH) 2 . Ainda segundo Horpibulsuk (2009), o papel da cinza na estabilização do SCAA é de dispersar os grandes grupos de solo-cimento em grupos menores, gerando assim um crescimento das superfícies em reação com a água e, consequentemente, dos produtos cimentantes.…”

Section: Introductionunclassified

“…Horpibulsuk (2009) observou, a partir da microestrutura e dos resultados dos ensaios de resistência, que a reatividade pozolânica da cinza volante é mínima no solo-cimento, diferentemente dos resultados obtidos na tecnologia do concreto, concluindo que isso pudesse ser devido a uma menor quantidade de Ca(OH) 2 . Ainda segundo Horpibulsuk (2009), o papel da cinza na estabilização do SCAA é de dispersar os grandes grupos de solo-cimento em grupos menores, gerando assim um crescimento das superfícies em reação com a água e, consequentemente, dos produtos cimentantes. Nessa pesquisa, foi avaliada a resistência à compressão mecânica do SCAA endurecido, observando a influência da CCA e comparando com traços de referência.…”

Section: Introductionunclassified

Influência da cinza de casca de arroz e da cal hidratada na resistência mecânica do solo-cimento auto-adensável endurecido

Claverie¹,

Alcântara²

2017

ANAP

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Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Cited by 223 publications

References 33 publications

Strength and microstructure development in Bangkok clay stabilized with calcium carbide residue and biomass ash

Strength and microstructure development in Bangkok clay stabilized with calcium carbide residue and biomass ash

Strength Development in Cement Admixed Bangkok Clay: Laboratory and Field Investigations

Influência da cinza de casca de arroz e da cal hidratada na resistência mecânica do solo-cimento auto-adensável endurecido

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