Industrial Production and Use of a Portland Calcined Clay Limestone Cement


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Title: Industrial Production and Use of a Portland Calcined Clay Limestone Cement

Author(s): Fernando Martirena and Karen Scrivener

Publication: Special Publication

Volume: 320


Appears on pages(s): 40.1-40.16

Keywords: blended cement, calcined clays, carbonation, chloride, concrete, durability, limestone

Date: 8/1/2017

The paper presents the practical experiences of an industrial trial carried out in Cuba for the production of a ternary blended cement made of a combination of clinker (50%), gypsum (8.9%), calcined clay (27.4%) and limestone (13.7%). The industrial trial was carried out at cement plant Siguaney. 130 tonnes of clay with approximately 50% kaolinite content were fired at temperatures around 800 oC. Discussion about the assessment of reactivity of the calcined material is presented. The material was mixed with limestone and fed to the grinder together with clinker and gypsum. The ternary cement proved to be as resistant as pure portland cement and fulfilled Cuban standards. The new cement was used in a wide variety of applications such as the manufacture of hollow concrete blocks and structural concrete. Details of the various mixture designs used and the results in different applications are presented. The new cement, despite the low clinker content, produces a more impermeable matrix with a less connected pore system. The case of chloride ingress and carbonation of concrete exposed offshore in Cuban coast is discussed.