Title: A New Accelerator Approach for Improved Strength Development

Author(s): Franz Wombacher, Christian Bürge, Emmanuel Gallucci, Patrick Juilland, and Gilbert Mäder

Publication: Symposium Paper

Volume: 302

Issue:

Appears on pages(s): 359-370

Keywords: hardening accelerator; calcium oxide; admixture; booster; early compressive strength; fly ash; limestone filler

DOI: 10.14359/51688109

Date: 6/1/2015

Abstract:
One of the main problems associated with supplementary cementitious materials (SCMs), which are used as clinker or cement replacement, is the slow strength development compared to pure OPC. This is especially evident in the early stages of cement hydration and may cause significant problems for the customers. Therefore, the demand for new and powerful accelerators only having a marginal influence on the workability of the concrete, is rising. These types of accelerators may find their application in normal ready-mixed concrete but, much more evident, in precast applications. In this paper, a new accelerator is presented, which can significantly improve the early strength (up to 2 days) of concrete. In addition to this, the components of this new approach do not bear any potential risk of corrosion for steel, be it normal reinforcement or prestressed steel.