Silicate-, aluminosilicate and calciumsilicate gels for building materials: chemical and mechanical properties during ageing

Rüscher, Claus H.; Mielcarek, Elzbieta M.; Wongpa, Jakrapan; Jaturapitakkul, Chai; Jirasit, F.; Lohaus, Ludger

doi:10.1127/0935-1221/2010/0022-2070

Cited by 38 publications

(23 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The red circles mark the main amorphous signature of MK, that is also present in GP, and implied that a significant amount of unreacted MK remains. The presence of unreacted MK is no disadvantage, but rather protects the long polysiloxo chains during aging, an important property for a long-standing mechanical strength (Rüscher et al 2011). The additional broad contribution in the GP centered around 28 • (2) is clearly related to the geopolymer framework.…”

Section: Mineralogical Characterizationmentioning

confidence: 99%

“…The lowest absorption band at 1620 cm −1 is attributed to the O H bending vibrations of water molecule bonds. The peak at 1076 cm −1 was assigned to a density of states peak maximum (DOSPM) of asymmetric stretching vibrations of SiO4-units of various connections (Si-O-Al and Si-O-Si) (Rüscher et al, 2011), including quartz. The peaks observed at 800, 685, 546 and 466 cm −1 are attributed to the presence of quartz along with the characteristic peaks of dehydrated kaolinite, too.…”

Section: Characterization Of Raw Materials and Sodium Waterglass Frommentioning

confidence: 99%

See 1 more Smart Citation

Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement

et al. 2017

View full text Add to dashboard Cite

Section: Mineralogical Characterizationmentioning

confidence: 99%

Section: Characterization Of Raw Materials and Sodium Waterglass Frommentioning

confidence: 99%

Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement

et al. 2017

View full text Add to dashboard Cite

“…[12,20,21]. The peak at 1076 cm −1 is assigned to the asymmetric stretching vibration modes of Si-O-Al and Si-O-Si [22,23]. The absorption band at 817 cm −1 is attributed to the bending vibration modes of Si-O-Si.…”

Section: Methods Of Characterizations Of the Starting Materials And Mmentioning

confidence: 99%

Water resistance and thermal behavior of metakaolin-phosphate-based geopolymer cements

Bewa

Tchakouté

Fotio

et al. 2018

Journal of Asian Ceramic Societies

Self Cite

View full text Add to dashboard Cite

The main target of this work was to investigate the thermal behavior and water resistance of geopolymer cement made from metakaolin as an aluminosilicate source using phosphoric acid solution (10 M) as a hardener. The obtained geopolymer cements were cured at room temperature for 28 days, the one part was treated at 200°C, 400°C, 600°C, 800°C and 1000°C, and the others were soaked in water for 28 days. The geopolymer cements were characterized by microstructural properties using X-ray diffractometry, infrared spectroscopy, microstructure, physical property based on water resistance and thermo-mechanical properties (thermal analysis, compressive strength). The results show that the compressive strength of the unheated geopolymer cement was 87.96 MPa. The ones soaked in water revealed a strength of 40.71 MPa. This indicates that the specimens soaked in water lose about 54% of their strengths. The X-ray patterns of heated geopolymer cements showed the formation of crystalline phases even at relatively low temperatures. It was typically found that the compressive strength of metakaolin-phosphate-based geopolymer cements decreases due to the hydrolysis of Si-O-P bonds in the presence of water. ARTICLE HISTORY

show abstract

“…Alkali activation results in a new peak at 1004 cm −1 arising both from the geopolymeric structure with Si-O-Al bond (23) as well as influence of Ca ions on the Si-O vibration mode in the geopolymer structure (26). The raw pond ash contains 5.5 wt.% CaO and can be suggested that bound mostly to glass phase.…”

Section: Characterization Of the Geopolymer Pastesmentioning

confidence: 99%

Properties of geopolymer binders prepared from milled pond ash

et al. 2017

View full text Add to dashboard Cite

Alkali-activated materials were prepared from pond ash from the Darkhan city (Mongolia) thermal power station. This ash contains about 60 wt % X-ray amorphous material in addition to quartz, mullite, hematite and magnesioferrite, and presents significant storage problems since it is accumulating in large amounts and is a hazardous waste, containing 90-100 ppm of the heavy metals As, Pb and Cr, and about 800 ppm Sr. Alkali-activated materials synthesized from the as-received pond ash achieved compressive strengths of only 3.25 MPa. Reduction of the particle size by mechanical milling for up to 30 min progressively increases the compressive strength of the resulting alkali-activated geopolymer up to 15.4 MPa. Leaching tests indicate that the combination of milling and alkali treatment does not cause the release of the hazardous heavy metals from the product, making it suitable for construction applications. RESUMEN: Propiedades de geopolímeros preparados a partir de cenizas de estanque.Se prepararon materiales activados alcalinamente a partir de cenizas de charca de la central térmica de Darkhan (Mongolia). Esta ceniza contiene alrededor de un 60% en peso de material amorfo además de mullita, hematita, cuarzo y magnesioferrite. Presenta además importantes problemas de almacenamiento ya que se acumula en grandes cantidades y es un desecho peligroso, que contiene entre 90-100 ppm de metales pesados como Pb y Cr, y alrededor de 800 ppm de Sr. Los materiales sintetizados a partir de las cenizas de estanque presentaron resistencias a compresión de tan sólo 3,25 MPa. La reducción del tamaño de partícula por fresado mecánico hasta 30 min aumentó las resistencias mecánicas hasta valores de 15.4 MPa. Las pruebas de lixiviación indican que la combinación de molienda y activación alcalina no causan la liberación de los metales pesados peligrosos del producto, por lo que resulta adecuado para aplicaciones en construcción.PALABRAS CLAVE: Cenizas de estanque; Molienda; Cementos activados alcalinamente; Resistencias a compresión; Microstructura ORCID ID: J. Temuujin

show abstract

Silicate-, aluminosilicate and calciumsilicate gels for building materials: chemical and mechanical properties during ageing

Cited by 38 publications

References 36 publications

Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement

Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement

Water resistance and thermal behavior of metakaolin-phosphate-based geopolymer cements

Properties of geopolymer binders prepared from milled pond ash

Contact Info

Product

Resources

About