The Influence of Various Gypsum Dosage, Specific Area of Cement and Water Reducers on Bleeding of Fresh Cement Paste Using Low-Field NMR

Yan Liang Ji; Zhen Ping Sun; Min Pang

doi:10.4028/www.scientific.net/MSF.1036.255

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HomeMaterials Science ForumMaterials Science Forum Vol. 1036The Influence of Various Gypsum Dosage, Specific...

The Influence of Various Gypsum Dosage, Specific Area of Cement and Water Reducers on Bleeding of Fresh Cement Paste Using Low-Field NMR

Abstract:

Based on the low-field NMR, this study inveitigated bleeding property of the fresh cement pastes mixed with various gypsum dosage, specific area of cement and water reducers. Results showed that the gypsum dosage between 3 % and 5 % will cause an decrease bleeding and a lower bleeding velocity, while a 1 % gypsum dosage will increase the bleeding as a function of time. The increase of the cement surface will lead to a less bleeding rate. This can be explained that the finer particle will contribute to the packing which will form a low permeability of the cement paste, as a result less bleeding water is observed. The PCEs-made sample has smaller hot zone area which indocated the PCEs has good bleeding stability when varing water cement ratio. Furthermore, bying comparing with the NPE, it was found the ACS type water reducer has higher bleeding sensitivity when high water cement ratios were used.

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Periodical:

Materials Science Forum (Volume 1036)

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255-262

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https://doi.org/10.4028/www.scientific.net/MSF.1036.255

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June 2021

Authors:

Yan Liang Ji, Zhen Ping Sun*, Min Pang

Keywords:

Bleeding, Cement Paste, Low-Field NMR, Water Reducer

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