CEMENT

[:ru]Али М. М.[:en]Ali, M. M.[:] [:ru]Национальный совет по цементам и строительным материалам, Баллабгар, Харьяна, Индия[:en]National Council for Cement and Building Materials, Ballabgarh, Haryana, India[:]

[:ru]Сатиш К. Агарвал[:en]Agarwal, S. K.[:] [:ru]Национальный совет по цементным и строительным материалам, Харьяна, Индия[:en]National Council for Cement and Building Materials, Haryana, India[:]

[:ru]Чаттерджи В. П.[:en]Chatterjee V. P.[:] [:ru]Национальный совет по цементу и строительным материалам, Баллабгар, Индия[:en]National Council for Cement and Building Materials, Ballabgarh, India[:]

Alitinform №3 (15) 2010 г. 57-67 p.

Abstract

The substitution of a part of ordinary Portland cement (OPC) clinker with mineral additions in the process of production of cement not only conserves cement grade limestone and clinker, but also reduced CO₂ emission along with saving energy [1]. Materials such as limestone, fly ash, blast furnace slag, rice husk ash, silica fume and metakaolin (MK) are known to improve the properties of cement/concrete in fresh/hardened state and are known as «Cement Performance Improvers» [2–4]. The addition of these materials at the clinker grinding stage is a well-accepted practice all over the world. The role of these mineral additions in product performance depends not only on the amount of addition but also on the physico-chemical and mineralogical characteristics [5–8]. These materials by themselves possess little or no cement properties, but some of them provide properties in finely divided form and through reaction with calcium hydroxide in presence of moisture at ambient or elevated temperature or through reducing gel porosity. Scientific investigations reported better properties with respect to flow, workability and physical performance etc on addition of these materials. The present paper describes effects on physical properties, hydration characteristics, mineralogical development and microstructure of cement specimens containing 5 % mineral additives such as limestone, fly ash, slag, metakaolin and a mix of fly ash and slag.