Title: The Influence of High Early-Strength (HES) Mineralized Clinker on the Strength development of blended cements containing fly ash, slag, or ground limestone

Author(s): S. Kelham, J. S. Damtoft, and B. L. O. Talling

Publication: Symposium Paper

Volume: 153

Issue:

Appears on pages(s): 229-248

Keywords: blended cements; clinker; concretes; fly ash; limestone; slags; strength; water content; workability; Materials Research

DOI: 10.14359/1072

Date: 6/1/1995

Abstract:
The strength development of blends of five cements with various levels of a fly ash, two blast furnace slags, a ground limestone, and a dried chalk dust was determined using EN 196 mortars and, for selected materials, concretes. Three of the cements were based on normal portland cement (OPC) clinkers and two on a high-early-strength (HES) mineralized clinker. At the same specific surface area and SO 3 content, the HES clinker gave cements with strengths 5 to 10 MPa higher than those based on equivalent normal clinker at all ages from one to 56 days. This allows the use of significant levels of fly ash, slag, or other less reactive materials in blends giving similar early strengths to normal portland cements. The early strengths of the blends with the ground limestone and the lower surface area HES cement were higher than expected. The finer chalk dust gave significant contributions to strengths with all the base cements, particularly at early ages. The effect was greater with the lower surface area cements and those based on HES clinker. It is concluded that the acceleration of hydration by the fine calcium carbonate is particularly strong with cements based on the mineralized clinker.