Preparation and properties of polycarboxylic acid superplasticizer dedicated for ultrafine powder admixture
In order to solve the problems of large viscosity,long flow time,easy bottom gripping and large shrinkage of ultrafine powder admixture in concrete application,the polycarboxylate acid superplasticizer dedicated for ultrafine powder admixture ZS-CX was synthesized by selection of the synthetic material and adjusting the synthesis process.The results show that when the monomer is EPEG,the initial temperature is 15℃,the time is 60 min,and the MAP dosage is 0.6％of the monomer mass,the prepared polycarboxylic acid superplasticizer has the best performance.Compared with the commercial water-reducing agent,the flow of clean paste,slump and expansion of concrete are increased,and the empty time of concrete can reach 5 s.The absolute value of Zeta poterntial is large,the electric flux of 60 d concrete is less than 1000 C,and the shrinkage rate is reduced by more than 30％.
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维普
