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A platform for research: civil engineering, architecture and urbanism
Pozzolanic activity of calcined halloysite-rich kaolinitic clays
https://orcid.org/0000-0002-2821-2043
AbstractThe aim of this study is to determine the pozzolanic activity of clays with high content of halloysite/kaolinite, and to evaluate the influence of halloysite/kaolinite ratio and halloysite morphology in the development of pozzolanic activity of the calcined clays. For this purpose, three different natural clays from Río Negro Province, Argentine, were selected and completely characterized. After calcined at 700°C and ground to 80% of particle size <45μm, pozzolanic activity was determined using the electrical conductivity test, the Frattini test and the compressive strength index. Results show that all calcined clays are classified as high reactive pozzolana. The presence of kaolinite and spheroidal halloysite exerts great influence at early ages; while tubular halloysite has greater influence in the pozzolanic activity and the compressive strength of mortars at later ages.
Graphical abstract
HighlightsPozzolanic activity of three halloysite/kaolinitic clays was studied.These clays calcined at 700°C and ground were classified as high reactive pozzolana.Pozzolanic activity (PA) at different age dependents the morphology of halloysite.The spheroideal halloysite and platy kaolinite has a positive influence in PA at early age.At late ages the tubular halloysite has greater influence in the PA.
Pozzolanic activity of calcined halloysite-rich kaolinitic clays
https://orcid.org/0000-0002-2821-2043
AbstractThe aim of this study is to determine the pozzolanic activity of clays with high content of halloysite/kaolinite, and to evaluate the influence of halloysite/kaolinite ratio and halloysite morphology in the development of pozzolanic activity of the calcined clays. For this purpose, three different natural clays from Río Negro Province, Argentine, were selected and completely characterized. After calcined at 700°C and ground to 80% of particle size <45μm, pozzolanic activity was determined using the electrical conductivity test, the Frattini test and the compressive strength index. Results show that all calcined clays are classified as high reactive pozzolana. The presence of kaolinite and spheroidal halloysite exerts great influence at early ages; while tubular halloysite has greater influence in the pozzolanic activity and the compressive strength of mortars at later ages.
Graphical abstract
HighlightsPozzolanic activity of three halloysite/kaolinitic clays was studied.These clays calcined at 700°C and ground were classified as high reactive pozzolana.Pozzolanic activity (PA) at different age dependents the morphology of halloysite.The spheroideal halloysite and platy kaolinite has a positive influence in PA at early age.At late ages the tubular halloysite has greater influence in the PA.
Pozzolanic activity of calcined halloysite-rich kaolinitic clays
https://orcid.org/0000-0002-2821-2043
AbstractThe aim of this study is to determine the pozzolanic activity of clays with high content of halloysite/kaolinite, and to evaluate the influence of halloysite/kaolinite ratio and halloysite morphology in the development of pozzolanic activity of the calcined clays. For this purpose, three different natural clays from Río Negro Province, Argentine, were selected and completely characterized. After calcined at 700°C and ground to 80% of particle size <45μm, pozzolanic activity was determined using the electrical conductivity test, the Frattini test and the compressive strength index. Results show that all calcined clays are classified as high reactive pozzolana. The presence of kaolinite and spheroidal halloysite exerts great influence at early ages; while tubular halloysite has greater influence in the pozzolanic activity and the compressive strength of mortars at later ages.
Graphical abstract
HighlightsPozzolanic activity of three halloysite/kaolinitic clays was studied.These clays calcined at 700°C and ground were classified as high reactive pozzolana.Pozzolanic activity (PA) at different age dependents the morphology of halloysite.The spheroideal halloysite and platy kaolinite has a positive influence in PA at early age.At late ages the tubular halloysite has greater influence in the PA.
Pozzolanic activity of calcined halloysite-rich kaolinitic clays
Tironi, Alejandra (author) / Cravero, Fernanda (author) / Scian, Alberto N. (author) / Irassar, Edgardo F. (author)
Applied Clay Science ; 147 ; 11-18
2017-07-17
8 pages
Article (Journal)
Electronic Resource
English
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