English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

To enhance the early strength of grounded granulated blast furnace slag (GGBFS) blended cement, the activation characteristics of GGBFS were examined by a potassium aluminum sulfate (PSA) clinker, consisting of KAl(SO4)2 and amorphous Al2O3 by calcining alunite (K2SO4 Al2(SO4)3 4Al(OH)3) at 650  C for 30 min. The PSA clinker reacted with calcium hydroxide and gypsum to form ettringite (3CaOAl2O3 3CaSO4 32H2O, AFt) by following reaction: 2KAl(SO4)2 þ 2Al2O3 þ 13Ca(OH)2 þ 5(CaSO4 2H2O) þ 74H2O ! 3(3CaOAl2O3 3CaSO4 32H2O) þ 2KOH. Mortar was prepared by mixing a blended cement of GGBFS and ordinary Portland cement (OPC) with PSA clinker as activator. The compressive strength of the GGBFS blended cement mortar was compared with that of OPC mortar. When the PSA clinker and gypsum activator was added to the blended cement of GGBFS and OPC, the hydration products investigated by DTA and X- ray diffraction were mainly ettringite and calcium silicate hydrate(C-S-H) gel. The early and long-term strengths of the GGBFS blended cement were higher than those of OPC. Therefore, PSA clinker as activator was shown to improve the early and long-term strengths of GGBFS blended cement. (doi:10.2320/matertrans.M2010350)

Activation of Ground Granulated Blast Furnace Slag Cement by Calcined Alunite