Title:
Industrial Production and Use of a Portland Calcined Clay Limestone Cement
Author(s):
Fernando Martirena and Karen Scrivener
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
40.1-40.16
Keywords:
blended cement, calcined clays, carbonation, chloride, concrete, durability, limestone
DOI:
10.14359/51701078
Date:
8/1/2017
Abstract:
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.