Premium
Hydration Products and Reactivity of Blast‐Furnace Slag Activated by Various Alkalis
Author(s) -
EscalanteGarcía Jose I.,
Fuentes Antonio F.,
Gorokhovsky Alexander,
FraireLuna Pedro E.,
MendozaSuarez Guillermo
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03623.x
Subject(s) - hydrotalcite , calcium silicate hydrate , chemistry , hydrate , ground granulated blast furnace slag , reactivity (psychology) , sodium , nuclear chemistry , phase (matter) , calcium silicate , microanalysis , slag (welding) , magnesium , inorganic chemistry , metallurgy , chemical engineering , materials science , cement , organic chemistry , catalysis , medicine , alternative medicine , pathology , engineering , fly ash
Pastes of blast‐furnace slag were cured for up to 90 d using sodium silicate (waterglass), NaOH, and three different mixtures of Na 2 CO 3 –Na 2 SO 4 –Ca(OH) 2 to activate reactions. The highest slag reactivity was observed for NaOH activation and the least for waterglass, although nonevaporable water indicated similar amounts of hydration products formed. The main hydration products found using X‐ray diffractometry in all systems were calcium silicate hydrate (C‐S‐H) and a hydrotalcite‐type phase. Microanalysis was performed on pastes activated using 50% Na 2 CO 3 ·25% Na 2 SO 4 ·25% Ca(OH) 2 , NaOH, and waterglass; the chemical composition of the C‐S‐H in the waterglass case was different relative to the other two alkalis. For all alkaline agents used, the C‐S‐H seemed finely intermixed with a hydrotalcite‐type phase of Mg/Al = 1.82, on average.