Study On Structure-performance Relationship And Molecular Structure Design Of Cement Grindina Aids

Through the study on the relationship between cement grinding aids’ molecularstructure and their grinding performance, adsorption-dispersion mechanism of grindingaids was cleared, and new grinding aids was synthesized. Research have shown that:With two or more polar groups and the whole molecule was polarity are the basis fororganics owing good grinding performance, and with the increase in the number ofpolar groups, the grinding performance become better; For grinding aids there exists acharacteristics dosage associated with unit cross-sectional area under which thegrinding efficiency is the best; The adsorption-dispersion form of grinding aids in thecement surface was raised-hydrogen bonding film formation theory to explain thereason for the change of the grinding aid performance with polar groups and non-polargroups, and based on this model, the molecular structure of ideal grinding agent wasdesigned; double bond of monomers containing hydroxyl and isopentyl enolpolyoxyethylene ethers were applied to synthetic polymer aids and its performancewas investigated, which indicates that a polymer grinding aids improve the grindingefficiency and working performance of concrete comparing to grinding aids withsmaller molecules.