PH double-response type concrete multifunctional admixture and preparation method thereof

Abstract

The invention discloses a PH double-response type concrete multifunctional admixture and a preparation method thereof. The preparation method of the multifunctional concrete admixture comprises the following steps: firstly, adding carboxymethyl chitosan, chitosan, nano silicon dioxide, cellulose acetate, N, N '-methylene bisacrylamide, an ammonium persulfate / tetramethylethylenediamine mixture and nano calcium silicate hydrate into an acetic acid solution, and performing ultrasonic continuous dispersion to obtain hybrid particles; secondly, a polycarboxylate superplasticizer, acrylamide, sodium alginate and the nano halloysite particles are magnetically stirred to be uniform, and a mixed dispersion solution is formed; and finally, adding the hybrid particles into the mixed dispersion solution to obtain the multifunctional concrete admixture. The concrete admixture can be kept stable under the storage condition of a polycarboxylic acid water reducer solution, and the viscosity of concrete is not increased after the concrete admixture is added into the concrete, so that the concrete admixture keeps good mixture performance, and good water retention and early strength effects are achieved.