By Krivenko, P. V.; Roy, D. M.; Shi, Caijun
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Extra resources for Alkali-activated cements and concretes
Example text
This may be because S2− causes disorder of the network. Ti exists in six-coordination when TiO2 content is less than 4% and in four-coordination when TiO2 content is higher than 4% (Smolczyk 1980). Thus, Ti does not have a significant effect on hydraulic reactivity of the slag when TiO2 content is less than 4%. The Chinese national standard GB203 (1992) limits the TiO2 content to less than 10%. The selectivity of activator is actually an indication of compatibility between chemical composition of the slag and activator(s) (Shi and Day 1996c).
7 summarizes reported minerals in different steel slags. Regardless of operations, the mainly mineral composition of ladle slag is -C2 S, which is converted from -C2 S during cooling. 7 Minerals in air-cooled steel slags (Shi 2004b) Mineral name Chemical formula Abbreviation Merwinite Tricalcium silicate Dicalcium silicate Rankinite Wollastonite Diopside Monticellite Calcium aluminate Calcium ferrite Magnesium silicate Sulphide RO Phase Lime Periclase Others 3CaO · MgO · 2SiO2 3CaO · SiO2 2CaO · SiO2 3CaO · 2SiO2 CaO · SiO2 CaO · MgO · 2SiO2 CaO · MgO · SiO2 CaO · Al2 O3 CaO · Fe2 O3 2MgO · SiO2 CaS, MnS, FeS FeO–MnO–CaO–MgO CaO MgO FeO, Fe2 O3 C3 MS2 C3 S –C2 S –C2 S C3 S2 CS CMS2 CMS CA CF M2 S RO -C2 S to -C2 S is accompanied by an increase in volume of nearly 10% and results in the shattering of the crystals into dust because of their different crystal structures and densities.
8 Relationship between compressive strength of steel slag cement and basicity of steel slag (based on Chinese Academy of Building Materials 1985). slag cement can be used for general construction uses, especially suitable for mass concrete and pavement applications due to its special features. The Chinese national standard GB 13590-92 (1992) specifies the composition, properties, testing, storage and applications for steel and iron slag Cementing components 51 cement. Another standard YB/T 022-92 (1992), which was developed and administrated by the Ministry of Metallurgical Industry of China, specifies the composition, quality, testing and storage of steel slag that can be used for the production of steel and iron slag cement.