Hydraulic clinkerless binder on the fluid sulfocalcic fly ash basis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916414" target="_blank" >RIV/60461373:22310/18:43916414 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/18:00329792 RIV/00216305:26310/18:PU147947

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0958946518300957" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0958946518300957</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconcomp.2018.06.020" target="_blank" >10.1016/j.cemconcomp.2018.06.020</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hydraulic clinkerless binder on the fluid sulfocalcic fly ash basis

Popis výsledku v původním jazyce

Sulfocalcic fly ash (mostly called FBC fly ash) is formed when a dry process of limestone injection is applied to the desulfurization of flue gases. The hydration of sulfocalcic fly ash results in the formation of an expanding low-strength body. Its volume instability prevents its use as an admixture to the concrete. The mixing of sulfocalcic fly ash, PCC fly ash and Ca(OH)2 in a presence of a plasticizer gives the possibility to obtain a ternary binder possessing strength values comparable to those of Portland cement (PC). The ternary binder is characterized by a long-tenn volume stability thanks to the presence of the plasticizer based on polycarboxylates that modifies the habitus of ettringite crystals; the expansion stresses due to the ettringite modification are thus eliminated. The SEM/EDX analyses have revealed that the composition of the amorphous parts does not correspond to that of the C-S-H phase because even Al is present in this phase. It was found, the hydrated ternary binder contains an amorphous C-A-S-H phase, a crystalline ettringite phase as well as residues of crystalline phases (as mullite, quartz, hematite) from the fly ashes. The C-A-S-H phase in the hydrated ternary binder can also be characterized by Al-21 MAS NMR as a geopolymer formed by alkaline activation of amorphous parts of ashes under the action of Ca(OH)2. The hydrated ternary binder is obviously similar to the Roman concrete because it contains an amorphous C-A-S-H phase. The ternary hydraulic binder would be a promising perspective for the use of the sulfocalcic fly ash that is nowadays predominantly deposit in the ash landfills.

Název v anglickém jazyce

Hydraulic clinkerless binder on the fluid sulfocalcic fly ash basis

Popis výsledku anglicky

Sulfocalcic fly ash (mostly called FBC fly ash) is formed when a dry process of limestone injection is applied to the desulfurization of flue gases. The hydration of sulfocalcic fly ash results in the formation of an expanding low-strength body. Its volume instability prevents its use as an admixture to the concrete. The mixing of sulfocalcic fly ash, PCC fly ash and Ca(OH)2 in a presence of a plasticizer gives the possibility to obtain a ternary binder possessing strength values comparable to those of Portland cement (PC). The ternary binder is characterized by a long-tenn volume stability thanks to the presence of the plasticizer based on polycarboxylates that modifies the habitus of ettringite crystals; the expansion stresses due to the ettringite modification are thus eliminated. The SEM/EDX analyses have revealed that the composition of the amorphous parts does not correspond to that of the C-S-H phase because even Al is present in this phase. It was found, the hydrated ternary binder contains an amorphous C-A-S-H phase, a crystalline ettringite phase as well as residues of crystalline phases (as mullite, quartz, hematite) from the fly ashes. The C-A-S-H phase in the hydrated ternary binder can also be characterized by Al-21 MAS NMR as a geopolymer formed by alkaline activation of amorphous parts of ashes under the action of Ca(OH)2. The hydrated ternary binder is obviously similar to the Roman concrete because it contains an amorphous C-A-S-H phase. The ternary hydraulic binder would be a promising perspective for the use of the sulfocalcic fly ash that is nowadays predominantly deposit in the ash landfills.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/TH02020163" target="_blank" >TH02020163: Vývoj a průmyslová optimalizace výrobních postupů stavebních hmot s využitím vysokého obsahu popílku</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

—

Svazek periodika

93

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

118-126

Kód UT WoS článku

000446283300011

EID výsledku v databázi Scopus

2-s2.0-85050153251