28-06-2012, 05:28 PM
geopolymer concrete
geopolymer concrete.pdf (Size: 108.72 KB / Downloads: 114)
Institute of Glass and Ceramics of Institute of Chemical
Technology Prague and Department of Building
Technology and department of Structural Mechanics of
Czech Technical University in Prague have been
involved in the research of alkali-activated materials
for many years now and, specifically, since 1973.
At present, the attention has been focused on the technological
and materials research into geopolymer materials
and particularly concretes. Geopolymer materials
based on rejected (mostly brown coal) fly ash have been
investigated. The results obtained within the framework
of the research projects indicate that the geopolymer
concrete is an economically advantageous material
exhibiting an excellent resistance. Recapitulative data
obtained during the investigation into the polymer concretes
were divulged in a variety of communications
[1-4] and several patents were filed too. The ulterior
research activity has not neglected drawbacks exhibited
by the geopolymer concrete either, e.g. its tendency to
the formation of efflorescences.
The investigation into the durability of geopolymer
materials must also deal with their long-term properties
(of the order of several centuries). As regards the materials
based on Portland cement, fundamental long-term
material data related to medieval and ancient constructions
are available (covering a period of about 2 000
years). The data refer to materials with hydration products
comparable to those of Portland cement. These are
materials in which highly hydraulic lime or mixed
Roman cement was used as a binder.
Davidovits [5,6] formulated a hypothesis about the
use of geopolymer binders during the construction of
ancient (and particularly Egyptian) monuments that are
more than 4 000 years old. In his opinion, the "concrete"
technology was used during the erection of Egyptian
pyramids for laying geopolymer mixes (with a limestone
aggregate) into formwork; individual blocks were
thus produced step by step. The hypothesis is corroborated
by analysis of inscriptions on ancient Egyptian
steles. The above worker argues that the pictures of
hieroglyphs should rather be interpreted in technical
terms than in the literary ones (as this has been done so
far). These deliberations accompanied by the interpretation
of analyses (microscopy, IR and NMR spectroscopy)
of sparse specimens from ancient Egyptian constructions
were published in papers [5,6].
geopolymer concrete.pdf (Size: 108.72 KB / Downloads: 114)
Institute of Glass and Ceramics of Institute of Chemical
Technology Prague and Department of Building
Technology and department of Structural Mechanics of
Czech Technical University in Prague have been
involved in the research of alkali-activated materials
for many years now and, specifically, since 1973.
At present, the attention has been focused on the technological
and materials research into geopolymer materials
and particularly concretes. Geopolymer materials
based on rejected (mostly brown coal) fly ash have been
investigated. The results obtained within the framework
of the research projects indicate that the geopolymer
concrete is an economically advantageous material
exhibiting an excellent resistance. Recapitulative data
obtained during the investigation into the polymer concretes
were divulged in a variety of communications
[1-4] and several patents were filed too. The ulterior
research activity has not neglected drawbacks exhibited
by the geopolymer concrete either, e.g. its tendency to
the formation of efflorescences.
The investigation into the durability of geopolymer
materials must also deal with their long-term properties
(of the order of several centuries). As regards the materials
based on Portland cement, fundamental long-term
material data related to medieval and ancient constructions
are available (covering a period of about 2 000
years). The data refer to materials with hydration products
comparable to those of Portland cement. These are
materials in which highly hydraulic lime or mixed
Roman cement was used as a binder.
Davidovits [5,6] formulated a hypothesis about the
use of geopolymer binders during the construction of
ancient (and particularly Egyptian) monuments that are
more than 4 000 years old. In his opinion, the "concrete"
technology was used during the erection of Egyptian
pyramids for laying geopolymer mixes (with a limestone
aggregate) into formwork; individual blocks were
thus produced step by step. The hypothesis is corroborated
by analysis of inscriptions on ancient Egyptian
steles. The above worker argues that the pictures of
hieroglyphs should rather be interpreted in technical
terms than in the literary ones (as this has been done so
far). These deliberations accompanied by the interpretation
of analyses (microscopy, IR and NMR spectroscopy)
of sparse specimens from ancient Egyptian constructions
were published in papers [5,6].