科研之友
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摘要
By adding basic oxygen furnace steel slag in Portland cement, steel slag-cement blended materials (SCBMs) were prepared. One reference cement (control) and four cements containing 15% to 60% w/w steel slag were tested. The results showed that steel slag had cementitious properties, but its activity was low. Therefore, compressive strength of SCBMs decreased with the increase of steel slag. The dormant period was retarded, and the cumulative hydration heat was reduced by the addition of steel slag. The main hydration products of SCBMs were similar to that of cement, but the amount of hydrated calcium silicate (C-S-H) gel as well as Ca(OH)(2) (CH) was less due to its lack of calcium silicate phase. EDX analysis demonstrated that large steel slag particles whose main component was gamma-C2S phase were partially hydrated and not well connected with other hydration products. However, CaO-FeO-MnO-MgO solid solution (RO phase) with particle size of 2 mu m could be wrapped well by the C-S-H gel. The hardened paste of SCBMs had a less compact microstructure than that of Portland cement, especially at early ages.
- 出版日期2013
- 单位北京化工大学
