Research On Synthesis, Properties And Mechanism Of Different Carboxyl Density And Functionallizing Polycarboxylate Superplasticizer

free radicals activity and the way of the combination of structure unit from the angle ofmicroscopic theoretical chemistry. The standard polycarboxylate superplasticizer(PC) was getthrough the orthogonal experiment of synthetic technology conditions and the choice of additives′dosage using the theory of free radical copolymerization, which has the best initial dispersion anddispersion retention. Based on the standard polycarboxylate superplasticizer, a series ofpolycarboxylate superplasticizers were get by changing the density of carboxylic acids andintroducing different functional groups. All the kinds of PC were put forward by IR and GPC toanalyze the specie of group and the amount of molecular weight and distribution. The effect ofcarboxyl density and different functional groups on the shear stress, apparent viscosity and otherrheological properties was studied by rotational viscometer. The effect of carboxyl density anddifferent on cement hydration rate and heat, cement hydration products and early compressivestrength of mortar by cement hydration exothermic tester and X-ray diffractometer.