The acceleration of cement hydration by seeding: influence of the cement mineralogy

A new seeding technology, successfully applied in the concrete sector, is allowing concrete producers to accelerate their production or to replace cement by more cementitious materials.

1 Introduction

The development of the mechanical properties in ordinary Portland cement is closely linked to the hydration of tricalcium and dicalcium silicates. Accelerating the hydration of these phases, and therefore the setting and hardening of concrete, is highly desired in many applications, mainly for speeding up the production or to reduce the cement portion in the concrete mix design. The addition of seeds, namely the “seeding”, is a common practice to accelerate and control the crystallization and in this case to accelerate the cement hydration. Despite the fact that this idea is not...

Related articles:

Issue 4/2019 TECHNISCHE UNIVERSITÄT BERLIN

Accelerating cement hydration with C-S-H seeds

1 Introduction According to the European climate and energy policy, the emission of greenhouse gases is to be reduced by 40?% by 2030 compared to 1990 [1]. The German cement industry contributes...

more
Issue 02/2013

Formation of intermediate phases during hydration of C3S

1 Introduction The setting of cement is an important technological process. Nowadays, more than 2 billion t of cement are manufactured and processed all around the world. In addition to the...

more
Issue 03/2009 Materials Science

Acceleration of the setting of hemihydrate plaster with calcium sulfate dihydrate

1 Introduction Calcium sulfate binders are required to have widely varying properties to meet technical and economic requirements. In particular, it has to be possible to vary the workability time and...

more
Issue 10/2020 UNIVERSITY OF SIEGEN

Investigation of hydration mechanisms of alpha and beta hemihydrate

1 Introduction Calcium sulfate hemihydrate [CaCO4???0.5H2O(s)] can be found naturally in very dry climate regions in Egypt, Australia, Death valley and Kuwait as bassanite, but in the presence of...

more
Issue 5/2015 UNIVERSITY OF SIEGEN

Investigations of the hydration of calcium sulfate hemihydrate

1 Introduction Gypsum is one of the most used materials in the world; 119 million tons of natural gypsum were extracted worldwide in 2006 (MINERAL COMMODITY 2007). Additionally another...

more