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Enhancement in early strengths of slag-cement mortars by adjusting basicity of the slag prepared from fly-ash of MSWI / Tzen-Chin Lee in Cement and concrete research, Vol. 39 N° 8 (Août 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 651–658 Titre : Enhancement in early strengths of slag-cement mortars by adjusting basicity of the slag prepared from fly-ash of MSWI Type de document : texte imprimé Auteurs : Tzen-Chin Lee, Auteur ; Wei-Jer Wang, Auteur ; Ping-Yu Shih, Auteur Année de publication : 2009 Article en page(s) : pp. 651–658 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : MSWI  fly-ash;  Cement  mortar;  Pozzolanic  reaction;  Slag;  Basicity;  Early  strength Résumé : The insufficient early strengths of cement mortars in which partial cement had been replaced by pulverized slag melted from municipal solid waste incinerator (MSWI) fly-ash were tackled in this study by adjusting the basicity of the slag through the addition of various amounts of CaCO3 into MSWI fly-ash, melted into a ‘modified slag’, pulverized to partially replace cement. Increased basicity in the modified slag manifestly improves the early compressive strengths of cement mortar with 20% Portland cement replaced by the modified slag powder (20 wt.% CaCO3 added). The 14-day and 28-day compressive strengths of the mortars evidently increased to nearly that of the reference specimen made of only Portland cement mortar. The 90-day compressive strength is even higher than that of the reference specimen. Porosity and Fourier transform infrared spectra (FTIR) analyses evidenced the improvement in early strengths by hydration while the enhancement in long-term strength by pozzolanic reaction in the CaCO3 added slag-cement mortar. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000908 [article] Enhancement in early strengths of slag-cement mortars by adjusting basicity of the slag prepared from fly-ash of MSWI [texte imprimé] / Tzen-Chin Lee, Auteur ; Wei-Jer Wang, Auteur ; Ping-Yu Shih, Auteur . - 2009 . - pp. 651–658. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 651–658 Mots-clés : MSWI  fly-ash;  Cement  mortar;  Pozzolanic  reaction;  Slag;  Basicity;  Early  strength Résumé : The insufficient early strengths of cement mortars in which partial cement had been replaced by pulverized slag melted from municipal solid waste incinerator (MSWI) fly-ash were tackled in this study by adjusting the basicity of the slag through the addition of various amounts of CaCO3 into MSWI fly-ash, melted into a ‘modified slag’, pulverized to partially replace cement. Increased basicity in the modified slag manifestly improves the early compressive strengths of cement mortar with 20% Portland cement replaced by the modified slag powder (20 wt.% CaCO3 added). The 14-day and 28-day compressive strengths of the mortars evidently increased to nearly that of the reference specimen made of only Portland cement mortar. The 90-day compressive strength is even higher than that of the reference specimen. Porosity and Fourier transform infrared spectra (FTIR) analyses evidenced the improvement in early strengths by hydration while the enhancement in long-term strength by pozzolanic reaction in the CaCO3 added slag-cement mortar. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000908