A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Slump improvement mechanism of alkalies in PNS superplasticized cement pastes
Abstract Some cement/superplasticizer combinations which result in rapid slump loss can be improved by the addition of alkali sulfates when using polynaphthalene or polymelamine sulfonates (PNS or PMS). It seems that for a given cement there exists an optimal content of soluble alkalies with sulfonated based superplasticizers. The major effect of the alkalies is to reduce the adsorption of PNS or PMS molecules by providing the necessary $ SO_{4} $−2 ions that are necessary to neutralize the active sites of the interstitial phase of the cement. The second effect of the addition of alkalies is to increase the pH of the interstitial solution of the mortar or of the concrete which seems to favor the non-adsorption of the superplasticizer molecules on the $ C_{3} $A.
Slump improvement mechanism of alkalies in PNS superplasticized cement pastes
Abstract Some cement/superplasticizer combinations which result in rapid slump loss can be improved by the addition of alkali sulfates when using polynaphthalene or polymelamine sulfonates (PNS or PMS). It seems that for a given cement there exists an optimal content of soluble alkalies with sulfonated based superplasticizers. The major effect of the alkalies is to reduce the adsorption of PNS or PMS molecules by providing the necessary $ SO_{4} $−2 ions that are necessary to neutralize the active sites of the interstitial phase of the cement. The second effect of the addition of alkalies is to increase the pH of the interstitial solution of the mortar or of the concrete which seems to favor the non-adsorption of the superplasticizer molecules on the $ C_{3} $A.
Slump improvement mechanism of alkalies in PNS superplasticized cement pastes
Kim, B. -G. (author) / Jiang, S. P. (author) / Aïtcin, P. -C. (author)
2000
Article (Journal)
English
Slump improvement mechanism of alkalies in PNS superplasticized cement pastes
| Springer Verlag | 2000
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