(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

Lecomte, I.; Henrist, Catherine; Liégeois, Monique; Maseri, Fabrizio; Rulmont, A.; Cloots, Rudi

doi:10.1016/j.jeurceramsoc.2005.12.021

Cited by 426 publications

(179 citation statements)

References 24 publications

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“…These findings concurred with the results reported by other authors (42)(43)(44). Nonetheless, phases present in the anhydrous slag or even attributable to carbonation may lead to overlapping in this region of the diffractogram.…”

Section: Mineralogical and Microstructural Characterisation Of The Alsupporting

confidence: 93%

Ceniza de cascarilla de arroz como fuente de sílice en sistemas cementicios de ceniza volante y escoria activados alcalinamente

Mejía¹,

Gutiérrez²,

Puertas³

2013

Mater. construcc.

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This study assesses the viability of using an agro-industrial by-product, rice husk ash (RHA) from a Colombian rice company's combustion facility, as a total replacement for the commercial sodium silicate ordinarily used in alkaliactivated binders. Fly ash (FA), granulated blast furnace slag (GBFS) and binary 50FA:50GBFS blended pastes were activated with a mix of sodium hydroxide and either sodium silicate or one of two types of RHA. The pastes were characterised for strength, mineralogy and microstructure. The findings showed that the agro-industrial by-product can be used to yield alkali-activated materials with 7-day mechanical strengths on the order of 42 MPa. The study confirmed that both amorphous silica and part of the crystalline silica present in RHA participate in the alkaline activation process, providing the alkalinity is suitably adjusted.

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Section: Mineralogical and Microstructural Characterisation Of The Alsupporting

confidence: 93%

Ceniza de cascarilla de arroz como fuente de sílice en sistemas cementicios de ceniza volante y escoria activados alcalinamente

Mejía¹,

Gutiérrez²,

Puertas³

2013

Mater. construcc.

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“…Likewise, it is clearly identified that the nature of reaction products forming in alkali-activated materials and hydrated Portland cement is completely different, and therefore realistic direct comparison of these materials cannot be carried out without considering these chemical differences, unless a performance-based approach is adopted. A detailed discussion of the differences in the crystalline products forming in these types of binders is reported in [28].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Microstructure and durability of alkali-activated materials as key parameters for standardization

Deventer

Nicolas

Ismail

et al. 2014

Journal of Sustainable Cement-Based Materials

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Alkali-activated concrete (AAC) has been commercialised as a low-CO2 construction material, but its adoption still faces several challenges, including standardisation, lack of a dedicated supply chain, limited service track record, and the question of whether laboratory durability testing can predict service life. This paper outlines how using different precursors leads to the formation of different AAC phase assemblages, and how AAC can be recognised in standards using a performance-based approach independent of binder chemistry. Microstructural assessment of pastes, strength development, water permeability and chloride migration of two AACs (100% slag and 1:1 slag:fly ash) are presented, and compared to Portland cement concrete. Manipulation of binder chemistry leads to differences in the properties of the AACs; however, both AACs assessed exhibited technical benefits in a performance-based comparison. AACs can meet the requirements of the equivalent performance concept, independent of the binder chemistry, supporting their scale-up, regulatory acceptance and wider adoption.

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“…When the alkali activator is a NaOH solution, the C-A-S-H gel exhibit a high Si Q 2 unit content and long linear chains with no Q 3 units which they did, however, detect when using Na 2 CO 3 as the activating solution [10]. Finally, the nature of the activator also induces differences in the chemical composition [13]. To this respect, Ca/Si in C-A-S-H gel in AAS is substantially smaller than the C-S-H gel in OPC systems.…”

Section: -Day Ew4mentioning

confidence: 96%

C-A-S-H gels formed in alkali-activated slag cement pastes. Structure and effect on cement properties and durability

Puertas

Palacios

Manzano

et al. 2014

MATEC Web of Conferences

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(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

Cited by 426 publications

References 24 publications

Ceniza de cascarilla de arroz como fuente de sílice en sistemas cementicios de ceniza volante y escoria activados alcalinamente

Ceniza de cascarilla de arroz como fuente de sílice en sistemas cementicios de ceniza volante y escoria activados alcalinamente

Microstructure and durability of alkali-activated materials as key parameters for standardization

C-A-S-H gels formed in alkali-activated slag cement pastes. Structure and effect on cement properties and durability

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