Comparative analysis of methods of introducing fine perlite into cement composition

Moscow State University of Civil Engineering, Yaroslavskoe sh., 26, 129337 Moscow, Russia

^* Corresponding author: iv.kozlova@mail.ru

Abstract

The article presents a comparative analysis of the methods of introducing fine perlite into the the cement systems. The first method is dry mixing of the additive with cement, followed by mixing with water with a polycarboxylate plasticizer. The second method is based on mixing cement powder with a stabilized suspension of finely dispersed perlite instead of mixing water. Before the introduction of a fine perlite suspension into the cement, studies of its aggregation and sedimentation stability were carried out. It was found that suspensions with 1-3% of perlite and 0.3-0.5% of polycarboxylate plasticizer after ultrasonic processing, have the greatest aggregation and sedimentation stability. There is an increase in the compressive strength of modified samples by more than 2 times at 1 day age and by 56% at 28 days age compared with non-modified cement. When compared with a sample with polycarboxylate plasticizer, there is an increase in the strength of the modified sample by 47% at 1 day age and by 19% at the at 28 days age. Thus, a comparative analysis showed that the method of obtaining a stabilized perlite suspension using an integrated approach and its introduction into the cement composition instead of mixing water, allows to obtain higher mechanical parameters.