Silica fume as porogent agent in geo-materials at low temperature

Prud’Homme, Elodie; Michaud, Philippe; Joussein, Emmanuel; Peyratout, Claire; Smith, Agnès; Arrii-Clacens, S.; Clacens, Jean‐Marc; Rossignol, Sylvie

doi:10.1016/j.jeurceramsoc.2010.01.014

Cited by 207 publications

(104 citation statements)

References 22 publications

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“…Again, the degree of aluminosilicate polymerization depends on the concentration of silicate solution 34,35 . E. Prud'homme et al confirm the existence of "in situ inorganic foam" in the presence of silica fume as an ENHANCING THE MECHANICAL AND MICRO-STRUCTURAL Dutta and Ghosh external agent in TGA-MS 25,26 . Here also, the effect of silica fume as supplementary of silicate solution can be investigated.…”

Section: Effect Of Supplements On Silicate Modulusmentioning

confidence: 97%

“…Low temperature or ambient temperature curing for geopolymer exhibits poor structure formation due to delayed setting 27 . The viscosity of geopolymer mixture is in fact increased with the rise in curing temperature 26,27 . All of the aspects like the viscosity of gel, the polarity of gel, stabilization of geopolymer, production of binder product is emphasized by the higher rate of reaction which is a function of curing temperature.…”

Section: Effect Of Supplements On Curing Temperaturementioning

confidence: 99%

“…These steps execute three basic occurrences like (a) production of di-hydrogen (b) silicon oxidation (c) development of silicon hydride class as demonstrated earlier 25 . The chemistry states that excessive presence of reactive silica may cause porous character by the generation of hydrogen 26 . Contributions of various ingredients in alkali-activated fly ash based geopolymer are needed to be discussed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Dutta¹,

Ghosh²

2018

RJC

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The present study aims to investigate the compressive strength and the underlying micro-structural change of fly ash geopolymer paste with silica fume and murram as supplements up to 10% and 2.5% of the total weight respectively. The workability property of the geopolymer paste samples was evaluated at a green state using a unique methodology based on the polar graph. Besides, various geopolymer paste samples were subjected to heat curing at different temperatures and also for different durations to find the influence of heat curing to the obtained compressive strengths. The present study also probed into the underlying micro-structural changes of the corresponding geopolymer paste samples through SEM (Scanning Electron Microscopy), MIP (Mercury Intrusion Porosimetry) and EDX (Energy Dispersive X-Ray Analysis). Through the present analysis, it can be concluded that blending of silica fume and murram with fly ash based geopolymer paste results in a sustainable high performance binder even at lower alkalinity with lower heat consumption as well as lower water content which can be considered as a better alternative of cement concrete binder to march towards environmental sustainability.

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Section: Effect Of Supplements On Silicate Modulusmentioning

confidence: 97%

Section: Effect Of Supplements On Curing Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Dutta¹,

Ghosh²

2018

RJC

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“…A wide variety of routes to foamed alkali-activated materials have also been demonstrated [85][86][87][88][89][90][91], and these offer pathways to the reduction of operational energy.…”

Section: Simplified Environmental Assessmentmentioning

confidence: 99%

Alkali-activated materials

Provis

2018

Cement and Concrete Research

1,310

371

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This paper, which forms part of the UNEP White Papers series on Eco-Efficient Cements, provides a brief discussion of the class of cementing materials known as 'alkali-activated binders', which are identified to have potential for utilization as a key component of a sustainable future global construction materials industry. These cements are not expected to offer a like-for-like replacement of Portland cement across its full range of applications, for reasons related to supply chain limitations, practical challenges in some modes of application, and the need for careful control of formulation and curing. However, when produced using locallyavailable raw materials, with well-formulated mix designs (including in particular consideration of the environmental footprint of the alkaline activator) and production under adequate levels of quality control, alkali-activated binders are potentially an important and cost-effective component of the future toolkit of sustainable construction materials.

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“…The production of commercial silicate solutions (Na 2 SiO 3 ·nH 2 O and K 2 SiO 3 ·nH 2 O) involves a high energy demand (temperatures close to 1000 °C-1400 °C) and the emission of greenhouse gases (7,8). In recent years there has been great interest for the use of alternative sources of amorphous reactive silica for producing alkaline activators: rice husk ash (3,4,(9)(10)(11)(12)(13)(14)(15)(16)(17), silica fume (2,3,(18)(19)(20)(21) and waste glasses (1,(22)(23)(24)(25) have been used and have shown similar microstructure and mechanical performance to geopolymers produced with commercial soluble silicate solutions (3,9,18,26,27).…”

Section: Introductionmentioning

confidence: 99%

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

2017

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Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 ºC. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

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Silica fume as porogent agent in geo-materials at low temperature

Cited by 207 publications

References 22 publications

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Alkali-activated materials

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

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