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RHEOLOGICAL DETERMINATION OF THE OPTIMUM DOSAGE OF DISPERSING AGENTS FOR KAOLIN SUSPENSIONS
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RHEOLOGICAL PROPERTIES OF KAOLIN SUSPENSIONS: EFFECT OF DEFLOCCULANT NATURE AND CONCENTRATION
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SODIUM PHOSPHATES AS DISPERSING AGENTS FOR CALCIUM CARBONATE INDUSTRIAL SLURRIES: RHEOLOGICAL CHARACTERIZATION
No full textIn the present work the influence of the addition of some dispersing agents employed for maximizing the solid loading of calcium carbonate suspensions has been investigated. Three commercial deflocculants were used: trisodium orthophosphate, sodium tripolyphosphate and sodium polyphosphate, Calcium carbonate aqueous suspensions were prepared at various solid volume fractions (0.270 to 0.382). Rheological tests were carried out at 25°C by using the rate controlled coaxial cylinder viscometer Rotovisko-Haake 20, system M5-osc., measuring device MV1P with serrated surfaces. The tests were performed under both continuous and oscillatory flow conditions. All the suspensions prepared without deflocculant show a rheological behavior of the shearthinning type; good correlations between relative viscosity and shear rate data were found by applying the Quemada model. The application of rheological techniques permitted to evaluate the efficiency of the dispersing agents employed. The sodium polyphosphate proved to be the most effective for the calcium carbonate slurries studied; the highest efficiency of polyphosphate can be explained on the basis of its oligomeric nature
SODIUM TRIPOLYPHOSPHATE AND POLYPHOSPHATE AS DISPERSING AGENTS FOR KAOLIN SUSPENSIONS: RHEOLOGICAL CHARACTERIZATION
No full textOPTIMIZATION OF PORTLAND CEMENT PASTES
No full textThe influence of the addition of three commercially available superplasticizers employed for maximising the solid loading of Portland cement pastes has been investigated. Cement pastes were prepared form deionized water and a commercial ordinary Portland cement 32.5 R. Cement and water were mixed with a vane stiffer according to ASTM Standard C305. The water/cement ratio was kept fixed to 0.32. The superplasticizers tested are based on mixtures of synthetic polyfunctional polymers (Fluiment 40), on highly-branched polymers containing specific functional groups (Fluiment SAE 25), and on polycyclic, copolymers with modified structures carrying hydroxylated side chains (Concretan RX). Rheological tests were performed at 25°C with the rate controlled coaial cylinder viscometer Rotovisko Haake 20, system M5-osc., measuring device MV2P with serrated surfaces. The tests were performed under both continuous and oscillatory flow conditions
Corrosion behaviour of nanocrystalline Cu90 Ni10 alloy in neutral solution containing chlorides
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