Logo: DBR, link til forsidenLogo: DBR, link til forsiden
DBR
  Udskriv Udskriv  Log ind Log ind  Søg Søg
Du er her: DBR > Pore structure and state of water of mixes with blended cements

Pore structure and state of water of mixes with blended cements

Title:
Pore structure and state of water of mixes with blended cements

Type of project:
PhD.–project

Responsible part:
DTU, Dept. of Civil Engineering

Description:
The project is one of 15 research projects (and one of 10 PhD projects) financed through the European MARIE CURIE ACTIONS Research Training Networks (RTNs) “Interdisciplinary and Intersectorial” Call: FP6-2004-Mobility-1. The 15 research projects together with a series of six one-week long formal courses form the MC RTN “Fundamental understanding of cementitious materials for improved chemical physical and aesthetic performance - NANOCEM”. This PhD project, MC RTN Project 3, is hosted by DTU.

The objective of the project is to provide improved understanding on the effect of typical SCMs in blended cements on the pore structure and state of water of hydrated materials. Ideally innovative materials should be sustainable and hence incorporate SCMs. SCMs affect both the assemblage of hydrates formed and the pore structure. To understand their impact on durability it is necessary to separate these two effects, and the most important factor affecting the strength of porous materials is pore structure. The study provides important input to projects in all three themes.

The project will concentrate on the characterization of the pore structure developed in paste or mortar systems made with cements with and without fly ash and slag used in MC RTN projects 1 and 2. This will allow estimation of the porosity based on a phase equilibria model. Specimens will be cured at different temperatures. The development of the pore system, including the connectivity of pores, will be followed by various techniques, including NMR to describe the state of water (Surrey). T2 relaxation will provide information on the size distribution of water filled spaces and 2D relaxation correlations will provide information on possible water exchange between gel and capillary pores. It is anticipated that these investigation will provide both improved understanding of the effect of SCMs and an improved basis for the assessment of results from classical characterisation techniques, i.e. validation of the techniques.

Project period:
January 2007 – December 2009

Participants:
DTU, Dept. of Civil Engineering
University of Surrey
Heidelberg Cement, Germany

Link:
www.byg.dtu.dk

Relation to the Danish Concrete Counsel focus areas:
1. Efficiency and economics
2. Aesthetics, function, and flexibility  x
3. Environment, work environment, and indoor climate  x
4. Recruitment, education, and R&D