Improvement of consistency and setting time of magnesium potassium phosphate cement pastes and mortars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00353052" target="_blank" >RIV/68407700:21110/21:00353052 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.5593/sgem2021/6.1/s26.47" target="_blank" >https://doi.org/10.5593/sgem2021/6.1/s26.47</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2021/6.1/s26.47" target="_blank" >10.5593/sgem2021/6.1/s26.47</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Improvement of consistency and setting time of magnesium potassium phosphate cement pastes and mortars

Popis výsledku v původním jazyce

In the presented study, magnesium potassium phosphate-based pastes and mortars were designed and tested. The examined samples were composed of the commercially delivered dead burned magnesia, phosphate binder in a molar ratio M/P 8/1, various dosing of the setting retarder (borax), and batch water. In MPC-based mortar, standardized silica sand was used as only filler. First, the fresh paste mixtures were researched. Form the initial fresh state of the particular pastes, temperature and dynamic elastic modulus were continuously recorded. Consistency of the analysed pastes was characterized by the spreading diameter. The setting time was measured by a Vicat apparatus. In the next step, the hardened mortar samples blended with silica sand filler were investigated. For the basic characterization of studied materials, bulk density, specific density, and total open porosity were measured. Mechanical resistance was described by flexural and compressive strength tests conducted after 2, 5, and 14 days of hardening. Obtained results pointed to the prolongation of the setting time with the increasing dosage of borax in mixtures, up to 15 min. at 5 wt. % of the retarder content, lower production of exothermic heat during the hydration reaction, and better workability of fresh mixtures, whereas the basic structural properties remained nearly unchanged and good mechanical resistance was also retained. Generally, the application of borax retarder led to the improvement of fresh mixtures performance and made material more usable in practice.

Název v anglickém jazyce

Improvement of consistency and setting time of magnesium potassium phosphate cement pastes and mortars

Popis výsledku anglicky

In the presented study, magnesium potassium phosphate-based pastes and mortars were designed and tested. The examined samples were composed of the commercially delivered dead burned magnesia, phosphate binder in a molar ratio M/P 8/1, various dosing of the setting retarder (borax), and batch water. In MPC-based mortar, standardized silica sand was used as only filler. First, the fresh paste mixtures were researched. Form the initial fresh state of the particular pastes, temperature and dynamic elastic modulus were continuously recorded. Consistency of the analysed pastes was characterized by the spreading diameter. The setting time was measured by a Vicat apparatus. In the next step, the hardened mortar samples blended with silica sand filler were investigated. For the basic characterization of studied materials, bulk density, specific density, and total open porosity were measured. Mechanical resistance was described by flexural and compressive strength tests conducted after 2, 5, and 14 days of hardening. Obtained results pointed to the prolongation of the setting time with the increasing dosage of borax in mixtures, up to 15 min. at 5 wt. % of the retarder content, lower production of exothermic heat during the hydration reaction, and better workability of fresh mixtures, whereas the basic structural properties remained nearly unchanged and good mechanical resistance was also retained. Generally, the application of borax retarder led to the improvement of fresh mixtures performance and made material more usable in practice.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA19-00262S" target="_blank" >GA19-00262S: Kompozity na bázi reaktivního hořečnatého cementu s vybranými příměsemi a aditivy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

21th International Multidisciplinary Scientific Geoconference SGEM 2021 Conference Proceedings

ISBN

978-619-7603-30-9

ISSN

1314-2704

e-ISSN

—

Počet stran výsledku

7

Strana od-do

367-373

Název nakladatele

STEF92 Technology Ltd.

Místo vydání

Sofia

Místo konání akce

Albena

Datum konání akce

14. 8. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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