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- W635020477 abstract "Three commercially used accelerating materials, calcium chloride, calcium nitrate and sodium thiocyanate, were studied for their effects on the hydration of a particular ordinary Portland cement. Testing was carried out at equal weight percentage levels on cement pastes at a water:cement ratio of 0.50. Test procedures used were X-ray diffraction, differential scanning calorimetry, solution analysis, semi-adiabatic and semi-isothermal calorimetry. Results generally agreed with the known effects of the three admixtures in site practice with the calcium chloride being effective at all ages, the calcium nitrate at early ages and the sodium thiocyanate at later ages. There was also a good correspondence between the results obtained with the various test methods employed. Significant depressions of the levels of hydroxide and sulphate ions in solution in the first three hours were found, particularly with the calcium salts. Depression of the sulphate ion concentration was paralleled by the formation of gypsum in the early X-ray diffraction and differential scanning calorimetry studies. The effects of the anions present in the admixtures appear to be significant in the later stages of hydration but no clear mechanisms were identified. (Author/TRRL)" @default.
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- W635020477 date "1990-01-01" @default.
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- W635020477 title "EFFECTS OF ACCELERATING ADMIXTURES ON CEMENT HYDRATION . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990" @default.
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