TY - JOUR
T1 - Relating the molecular structure of comb-type superplasticizers to the compression rheology of MgO suspensions
AU - Kjeldsen, Ane Mette
AU - Flatt, Rober Johan
AU - Bergström, Lennart
PY - 2006
Y1 - 2006
N2 - We have investigated the effect of superplasticizers on the rheological properties of concentrated MgO suspensions. The comb-type anionic polymers with grafted polyethylene oxide chains adsorb onto the MgO surface and infer a steric repulsion where the range scales with the length of the PEO side chains. Consolidation experiments, where the volume fraction gradient of particle networks has been determined in response to a centrifugal force field, offer a simple, yet accurate, way of investigating flocculated, partly stabilized and stable suspensions under compression. The compression rheology behaviour could be related to the estimated thickness of the adsorbed superplasticizers and a scaling analysis was used to quantitatively assess the importance of the length of the grafted PEO-chains on the magnitude of the inter-particle bond strength.
AB - We have investigated the effect of superplasticizers on the rheological properties of concentrated MgO suspensions. The comb-type anionic polymers with grafted polyethylene oxide chains adsorb onto the MgO surface and infer a steric repulsion where the range scales with the length of the PEO side chains. Consolidation experiments, where the volume fraction gradient of particle networks has been determined in response to a centrifugal force field, offer a simple, yet accurate, way of investigating flocculated, partly stabilized and stable suspensions under compression. The compression rheology behaviour could be related to the estimated thickness of the adsorbed superplasticizers and a scaling analysis was used to quantitatively assess the importance of the length of the grafted PEO-chains on the magnitude of the inter-particle bond strength.
U2 - 10.1016/j.cemconres.2006.03.019
DO - 10.1016/j.cemconres.2006.03.019
M3 - Journal article
SN - 0008-8846
VL - 36
SP - 1231
EP - 1239
JO - Cement and Concrete Research
JF - Cement and Concrete Research
IS - 7
ER -