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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Environmentally Friendly Concretes Manufactured with CSA Cement
Author(s): Luigi Coppola, Denny Coffetti, and Elena Crotti
Publication: Special Publication
Appears on pages(s): 51.1-51.10
Keywords: Calcium sulphoaluminate cement, Portland cement, supplementary cementitious materials, sustainability, ternary binders, concrete
Abstract:A ternary binder based on ordinary Portland cement (OPC), a commercial CSA clinker and a technical grade anhydrite (CS̅) was used to manufacture the reference concretes (CSA:OPC:CS̅ = 40:40:20). Ground granulated blast furnace slag (S), low calcium siliceous type V fly ash (FA) and an hydrated lime (CH) CL90-S were employed to replace totally OPC in environmentally friendly mixtures (CSA:SCM:CH:CS̅= 40:35:5:20). Tartaric acid-based set-retarding admixture was added at 0.4% vs binder mass and the mixing water was fixed equal to about 200 kg/m3. Experimental data show that the water/binder ratio does not strongly influence the slump of concretes and the workability loss over time. In general, it is possible to conclude that, for practical uses, OPC- or S-based concretes require greater set-retarding admixture dosage than that needed for FA compounds. Furthermore, results indicated that water/binder is, similarly to OPC-based concretes, a key factor in the development of mechanical performances. Moreover, by replacing OPC with hydrated lime and SCMs, negligible changes in 24-hours strength are noted while 30% reduction in compressive strength at 7 and 28 days from casting is achieved, independently of w/b ratio adopted. Also, the curing conditions strongly influence the performances of mixtures. In fact, reference concrete cured in dry environment (T = 20°C, R.H. 60%) are characterized by strength greater than 15% compared to that of wet cured mixture. On the contrary, mixtures containing SCMs show more marked differences between wet and dry curing. Finally, total replacement of OPC with CSA:SCM:CH:CS̅ determines a sharp reduction in greenhouse gases emissions and energy requirement up to 60% at equal strength class respect to reference OPC-mixture.
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