Wpływ glukonianu i cytrynianu sodu na konsystencję zaczynów z półwodnego gipsu α upłynnianego superplastyfikatorem polikarboksylanowym

Wang, K.; Yang, L.; Ren, L.

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Tytuł artykułu

Wpływ glukonianu i cytrynianu sodu na konsystencję zaczynów z półwodnego gipsu α upłynnianego superplastyfikatorem polikarboksylanowym

Autorzy

Wang K. , Yang L. , Ren L.

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

Warianty tytułu

Effect of sodium gluconate and citrate on fluidity of alpha-hemihydrate gypsum paste plasticized by polycarboxylate superplasticizer

Języki publikacji

PL EN

Abstrakty

W pracy przedstawiono wyniki badań wpływu cytrynianu oraz glukonianu sodu na właściwości zaczynów z półwodnego siarczanu wapnia odmiany alfa, upłynnianych dodatkiem superplastyfikatora polikarboksylanowego [PA]. Na podstawie uzyskanych wyników stwierdzono, że zdolność do adsorpcji cytrynianu sodu jest znacznie większa od glukonianu, ze względu na większą zdolność tego pierwszego do tworzenia kompleksów chelatowych z jonami wapnia. W przypadku równoczesnego dodatku plastyfikatora i opóźniacza zachodzi adsorpcja wymienna. Cytrynian oraz glukonian sodu opóźniają hydratację gipsu, przy czym efekt opóźniający cytrynianu jest znacznie większy niż glukonianu, ze względu na większą zdolność tego pierwszego do adsorpcji na ziarnach półwodzianu. Przyczyną poprawy konsystencji jest mniejsza ilość zużytej wody i PA, spowodowana działaniem opóźniającym, a przyczyną pogorszenia konsystencji jest mniejsza ilość zaadsorbowanego PA wynikająca z adsorpcji wymiennej cytrynian lub glukonian i PA. W przypadku glukonianu sodu dominuje pierwszy efekt co powoduje poprawę płynności zaczynu, a dla cytrynianu przeważa drugi efekt co wpływa na jej pogorszenie.

The effect of sodium gluconate and sodium citrate on the fluidity of gypsum paste of α hemihydrate plasticized by polycarboxylate superplasticizer [PCE] was investigated. The results have shown that both retarders are adsorbed on the surface of gypsum particles, and the adsorption ability of citrate is much higher than that of gluconate, probably due to the more developed ability of citrate to form chelate complexes with calcium ions. In the case of simultaneous addition of PCE and retarder to hemihydrate paste, the competitive adsorption takes place. The retarding effect of citrate is much stronger than that of gluconate, because of the higher adsorption ability of citrate. Sodium gluconate increase the fluidity of the gypsum paste plasticized by PCE, while citrate reduce it. The reason for the increase of fluidity is due to the reduced consumption of free water and PCE caused by hydration of hemihydrate. Retarding effect is due to the reduced adsorption of PCE, resulting from competitive adsorption with retarder. The latter effect dominates for citrate, resulting in decreased fluidity, while first effect is dominating for gluconate, resulting in increased fluidity.

Słowa kluczowe

zaczyn gipsowy superplastyfikator karboksylanowy glukonian sodu cytrynian sodu przewodnictwo TOC adsorpcja

gypsum paste polycarboxylate superplasticizer sodium gluconate sodium citrate conductivity TOC adsorption

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2018

Tom

R. 21/83, nr 2

Strony

144--158

Opis fizyczny

Bibliogr. 39 poz., il., tab.

Twórcy

autor

Wang K.

kwangjob@sina.com

School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China

autor

Yang L.

School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China

autor

Ren L.

School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).

Typ dokumentu

Bibliografia

Identyfikator YADDA

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