COMPETITIVE ADSORPTION OF POLYMERS AT THE SURFACE OF CEMENT PARTICLES
In order to reach the rheological target requirements for Self Compacting concretes, mix design engineers have the freedom to mix various organic molecules.These polymers either stay in the interstitial fluid modifying its theological behaviour or adsorb at the surface of cement grains modifying their colloidal interactions.When the polymers added to the system are both adsorbing species, the outcome of competitive adsorption between molecules dictates the rheological behaviour of the SCC.In this work, we study competitive adsorption of a so-called viscosity agent and of a plasticizer molecule.We develop a new protocol using Dynamic Light Scattering to distinguish the relative adsorption of different fractions of the admixtures.This protocol allows us to evaluate in a more quantitative manner the adsorbed amount of each polymer and to determine the key parameters dictating the behaviour of admixture in combination.
Hela Bessaies Bey Robert Baumann Nicolas Roussel
IFSTTAR, université Paris Est DOW Construction Chemicals
国际会议
厦门
英文
170-172
2014-06-05（万方平台首次上网日期，不代表论文的发表时间）