Hydration of Portland cement paste mixed with densified silica fume: From the point of view of fineness

2021 ◽  
Vol 272 ◽  
pp. 121906
Author(s):  
Chenxin Ni ◽  
Qingyong Wu ◽  
Zhuqing Yu ◽  
Xiaodong Shen
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Cement Paste ◽  
Point Of View ◽  
Portland Cement Paste

scholarly journals THE EFFECT OF CEMENT MODIFICATION ON THE RHEOLOGICAL PROPERTIES OF CEMENT PASTE

2014 ◽  
Vol 19 (Supplement_1) ◽  
pp. S125-S130 ◽  
Author(s):  
Eugenijus Janavičius ◽  
Mindaugas Daukšys ◽  
Gintautas Skripkiūnas ◽  
Džigita Nagrockienė ◽  
Ala Daugėlienė
Keyword(s):  
Portland Cement ◽  
Rheological Properties ◽  
Yield Stress ◽  
Silica Fume ◽  
Cement Paste ◽  
Sodium Silicate Solution ◽  
Experimental Tests ◽  
Silicate Solution ◽  
Rotational Viscometer ◽  
Portland Cement Paste

Experimental tests have determined the effect of slag, opoka (silica-calcite sedimentary rock), silica fume (SiO2) suspension, dolomite dust and sodium silicate solution (NaSS) together with the polycarboxylatether based plasticizing admixture on the yield stress and viscosity of Portland cement paste the rheological properties of which have been defined applying a rotational viscometer with co-axial cylinders. The tests have revealed that slag, opoka, silica fume suspension and dolomite dust added to cement paste by replacing 10% of Portland cement (by weight) have an effect on the yield stress and viscosity of the paste subject to the form and fineness of additive particles. When 10wt% of Portland cement is replaced with slag cement, the yield stress of Portland cement paste reduces by about 25.9%, and viscosity increases by about 3.5 times compared with the yield stress and viscosity of reference cement paste. The yield stress of Portland cement paste with 0.5% NaSS admixture increases insignificantly, and viscosity grows approximately twice compared with reference cement paste. The tests have also showed that the modifying admixtures of Portland cement paste enable to control the rheological properties of cement paste.

Interaction Between Naphthalene Sulfonate and Silica Fume in Portland Cement Pastes

1987 ◽  
Vol 114 ◽  
Author(s):  
Sidney Diamond ◽  
Leslie J. Struble
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Cement Paste ◽  
Uv Spectrophotometry ◽  
Residual Concentration ◽  
Cement Pastes ◽  
High Ph ◽  
Substantial Concentration ◽  
Low Dosage

ABSTRACTPortland cement pastes were mixed with predissolved naphthalene sulfonate superplasticizer at normal water:cement ratios. Solutions were separated from the fresh pastes at intervals and the residual concentration of the superplasticizer determined by UV spectrophotometry. At low dosage levels essentially all of the superplasticizer was found to be removed from solution within a few minutes; at high dosage levels a substantial concentration was maintained in solution at least to approximately the time of set. In pastes in which silica fume replaced 10% by weight of the cement, it was found that the incorporation of silica fume significantly increased the uptake of superplasticizer. In separate trials it was found that the silica fume by itself adsorbed little superplasticizer, even from high pH solution simulating that of cement paste.

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