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Influence of portland cement addition to sulphoaluminate-belite cement on hydtration and mechanical properties of hardened mortars
Ordinary Portland cement (PC), calcium sulphoaluminate - belite (SAB) cement and a 85 wt-% SAB cement/15 wt-% PC blend were used for mortar manufacture (cement to sand weight ratio 1 : 3, w/c ratio 0.5) of 40X40x160 mm specimens kept in wet air cure (20 deg C, 100 % R.H. for 90 days), and used for the tests. The results reveal the influence of cement type on mortar properties. The mortars, made from tested SAB cement have the worst mechanical properties. The replacement of 15 wt-% of SAB cement by PC contributes to the increase in dynamic modulus of elasticity (DME), flexural strength of the mortar 15 % and compressive strength almost by 40 % compared to the SAB cement mortar. Such mortar behaves mechanically similar to PC mortar. Differences in mechanical properties of mortars are caused by differences in chemical composition of cements (in SAB/PC mortar content of CaO is increased by 6.4 %, contents of Al2O3 and Fe2O3 are decreased by 8.2 % and 7.0 %, respectively compared to SAB cement mortar; SO3 content is 2.6x higher than that in the PC mortar), and mineralogical composition and hydration kinetics of cements. Differences in mineralogical composition, mainly ettringite formation, and consequently hydration kinetics are the substantial reason of higher demands on batch water; rapid initial and final set of SAB cement and lower DME and strength of SAB cement mortar relative to PC and PC mortar; respectively. The 85 wt-% SAB cement/15 wt-% PC blend gains on hydration activity, DME and strength growth by the C3S activator from PC supporting less-active SAB cement hydration. Utility properties of SAB/PC mortar are more similar to PC mortar than SAB cement mortar.
Influence of portland cement addition to sulphoaluminate-belite cement on hydtration and mechanical properties of hardened mortars
Ordinary Portland cement (PC), calcium sulphoaluminate - belite (SAB) cement and a 85 wt-% SAB cement/15 wt-% PC blend were used for mortar manufacture (cement to sand weight ratio 1 : 3, w/c ratio 0.5) of 40X40x160 mm specimens kept in wet air cure (20 deg C, 100 % R.H. for 90 days), and used for the tests. The results reveal the influence of cement type on mortar properties. The mortars, made from tested SAB cement have the worst mechanical properties. The replacement of 15 wt-% of SAB cement by PC contributes to the increase in dynamic modulus of elasticity (DME), flexural strength of the mortar 15 % and compressive strength almost by 40 % compared to the SAB cement mortar. Such mortar behaves mechanically similar to PC mortar. Differences in mechanical properties of mortars are caused by differences in chemical composition of cements (in SAB/PC mortar content of CaO is increased by 6.4 %, contents of Al2O3 and Fe2O3 are decreased by 8.2 % and 7.0 %, respectively compared to SAB cement mortar; SO3 content is 2.6x higher than that in the PC mortar), and mineralogical composition and hydration kinetics of cements. Differences in mineralogical composition, mainly ettringite formation, and consequently hydration kinetics are the substantial reason of higher demands on batch water; rapid initial and final set of SAB cement and lower DME and strength of SAB cement mortar relative to PC and PC mortar; respectively. The 85 wt-% SAB cement/15 wt-% PC blend gains on hydration activity, DME and strength growth by the C3S activator from PC supporting less-active SAB cement hydration. Utility properties of SAB/PC mortar are more similar to PC mortar than SAB cement mortar.
Influence of portland cement addition to sulphoaluminate-belite cement on hydtration and mechanical properties of hardened mortars
Einfluß der Portlandzement-Zugabe zu Sulphoaluminat-Belitzement auf die Hydratation und die mechanischen Eigenschaften von ausgehärtetem Mörtel
Janotka, I. (author) / Krajci, L. (author) / Mojumdar, S.C. (author)
Ceramics Silikaty, Prag ; 46 ; 110-116
2002
7 Seiten, 4 Bilder, 8 Tabellen, 27 Quellen
Article (Journal)
Czech
| British Library Online Contents | 2002
| European Patent Office | 2024
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