Calorimetry calcium silicates

Metakaolin reacts with lime to yield calcium silicate hydrate. Metakaolin may also be activated by other materials such as alkali metal hydroxides, water glass, etc. Activation leads to a polycondensation product with cementing properties. The t5q)e of MK, composition, temperature at which it is produced, surface area, etc., determine the strength development characteristics of the product. In conduction calorimetry, an exothermic peak results by the reaction of MK and the activator. A strong as5mimetric peak in calorimetry is associated with an amorphous inorganic... 

Addition of dampproofers based on caprylic, capric or stearic acids, stearates or wax emulsions do not have any effect on the setting characteristics of hydration products of Portland cement. However, the unsaturated fatty acid salts, such as oleates, although not affecting the tricalcium silicate hydration, have a marked effect on the ettringite and monosulfate reaction [12] and this is illustrated in the isothermal calorimetry results in Fig. 4.4. It is possible that a calcium oleoaluminate hydrate complex is formed involving the double bond of the oleic acid. 

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