Effects of alkaline-activated fly ash and Portland cement on soft soil stabilisation

Cristelo, Nuno; Glendinning, S. G.; Fernandes, Lisete; Pinto, Amândio Teixeira

doi:10.1007/s11440-012-0200-9

Cited by 211 publications

(102 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Basically, this is a consequence of the different nature of the soluble or glassy mass governing each material, in the sense that a calcium-based glass structure is more reactive with water than a siliceous-based glass structure (Diaz et al, 2010). The results presented show that the UCS of the low-Ca geopolymer almost doubled between the 28 and 90 days of curing, in agreement with previous research (Cristelo et al, 2011(Cristelo et al, , 2013. However, even if strength is continuously increasing, for tight construction projects it is not necessary to wait for such a long time, since considerable strength is obtained for smaller periods.…”

Section: Strength Analysissupporting

confidence: 90%

See 1 more Smart Citation

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Rı́os

Cristelo

Fonseca

et al. 2016

J. Mater. Civ. Eng.

Self Cite

113

View full text Add to dashboard Cite

Alkaline activation of fly ash was used to improve the mechanical performance of a silty sand, considering this new material as a replacement of soil-cement applications namely bases and subbases for transportation infrastructures. For that purpose, specimens were molded from mixtures of soil, fly ash and an alkaline activator made from sodium hydroxide and sodium silicate. Uniaxial compression tests showed that strength is highly increased by the addition of this new binder. The results described a high stiffness material, with an initial volume reduction followed by significant dilation. All specimens have clearly reached the respective yield surface during shearing, and peak strength Mohr-Coulomb parameters were defined for each mixture. The evolution of the microstructure during curing, responsible for the mechanical behavior detected in the previous tests, was observed by scanning electron microscopy. These results were compared to soil-cement data obtained previously with the same soil at similar compaction conditions. The main difference between both binders was the curing rate, with alkali activated specimens showing a more progressive and long-lasting strength increase. This was analyzed taking into account the chemical process responsible for the behavior of the mixtures.

show abstract

Section: Strength Analysissupporting

confidence: 90%

“…The available results comparing AA and cement-based binders have proved the technical and economic 5 viability of the former (Cristelo et al, 2012a(Cristelo et al, , 2013Rao et al, 2014;Sukmak et al, 2015).…”

Section: Introductionmentioning

confidence: 97%

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Rı́os

Cristelo

Fonseca

et al. 2016

J. Mater. Civ. Eng.

Self Cite

113

View full text Add to dashboard Cite

show abstract

“…Through alkaline activation, the bonding characteristics of abended pre-calcined by-products can offer a good alternative to OPC with the advantages summarized by the fact that all source materials are already calcined which eliminates the need for any energy in the manufacturing and utilisation process, and this in turn contributes to considerable reduction in CO2 emission [2], [3], [5]. Geopolymers, among other alkaline activation materials, are derived from low calcium aluminosilicate materials such as fly-ash, which when activated, form a gel of three-dimensional framework represented by the chemical structure N-A-S-H [4], [6], [7].…”

Section: Introductionmentioning

confidence: 99%

“…Most available research and industrial applications on geopolymers are limited to steamed or dry heat-cured concrete [12], whereas for ground improvement, elevated heat is not practically possible. Therefore, soil stabilization by geopolymers has only been investigated at ambient temperature [2], [13], [14]. In fact, low temperature maintains slow rate of geopolymerisation and strength gain in stabilized soils.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of Clay with Fly-Ash Geopolymer Incorporating GGBFS

Abdullah¹,

Shahin²,

Sarker³

2017

World Congress on Civil, Structural, and Environmental Engineering

View full text Add to dashboard Cite

-Low water/binder ratio and higher activator content can help to accelerate the setting and strength development of fly-ash geopolymers cured at ambient condition. This study aims to achieve clay stabilization with fly-ash based geopolymer incorporating ground granulated blast-furnace slag (GGBFS), to enhance soil strength performance at ambient temperature. Laboratory experiments were performed on clay samples stabilized with both slag and fly-ash geopolymer and ordinary Portland cement (OPC), including the soil plasticity, compaction and unconfined compressive strength. The investigation was expanded to include un-activated fly-ash/slag clay samples used as control mixtures. The results indicated that introducing GGBFS to class (F) fly-ash based geopolymer assists, when synthesised in certain concentrations, in achieving a setting time and compressive strength comparable to OPC stabilised clay.

show abstract

“…Developing of geopolymer technology by Davidovits [4,5] offers an attractive solution for soil stabilization regarding the emission of carbon dioxide to the atmosphere that produced by Ordinand Portland Cement (OPC) in conventional method [6,7]. Soil stabilization by using geopolymer have been popularly applied in construction field such as fly ash [8] rice husk ash [9], lime [10] and metakaolin [11]. Dali Bondar et.…”

Section: Introductionmentioning

confidence: 99%

Correlation of the Na₂SiO₃to NaOH Ratios and Solid to Liquid Ratios to the Kedah’s Soil Strength

Hamzah

Cheng-Yong

Zainol³

et al. 2016

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. Geopolymer was used for the soil stabilization of Kedah's soil at different ratios of solid to liquid and Na 2 SiO 3 to NaOH in order to achieve the desired compressive strength. The geopolymerization process which produces an aluminosilicate gel was occurred due to the mixing of Kedah's soil and fly ash with Na 2 SiO 3 and NaOH. Soil stabilization by geopolymer was synthesized by the activation of fly ash and Kedah's soil with Na 2 SiO 3 and NaOH at different ratios of solid to liquid (1.5, 2.0, 2.5 and 3.0) and Na 2 SiO 3 to NaOH (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0) at a specific constant concentration of NaOH solution of 6M. The compressive strength up to 5.12 MPa was obtained at 3.0 of solid to liquid ratio and 2.5 of Na 2 SiO 3 to NaOH ratio in 7 days curing at room temperature.

show abstract

Effects of alkaline-activated fly ash and Portland cement on soft soil stabilisation

Cited by 211 publications

References 27 publications

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Stabilisation of Clay with Fly-Ash Geopolymer Incorporating GGBFS

Correlation of the Na₂SiO₃to NaOH Ratios and Solid to Liquid Ratios to the Kedah’s Soil Strength

Contact Info

Product

Resources

About

Effects of alkaline-activated fly ash and Portland cement on soft soil stabilisation

Cited by 211 publications

References 27 publications

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Structural Performance of Alkali-Activated Soil Ash versus Soil Cement

Stabilisation of Clay with Fly-Ash Geopolymer Incorporating GGBFS

Correlation of the Na2SiO3to NaOH Ratios and Solid to Liquid Ratios to the Kedah’s Soil Strength

Contact Info

Product

Resources

About

Correlation of the Na₂SiO₃to NaOH Ratios and Solid to Liquid Ratios to the Kedah’s Soil Strength