Investigation of carboxylate plasticizer modification potential in modified fine-grained concrete mixes
The widespread practice of using the modern oligocarboxylated giperplasticizers of the latest generation is caused by a number of objective reasons: the necessity of the improving the technology of concrete mix placement with gradual transition to the self-compacting concretes, a serious increase in the ecological and sanitary requirements to the modern building materials. For example: sulfonaphtalene plasticizers series C-3, SP-1 and SP-3 were restricted to use in the EU-countries in 2011. However the cost of carboxylate additives is very expensive and it is much higher, than the cost of sulfonaphtalene plasticizers, that is why the ways of increasing their efficiency with the following reduction of dosage are economically profitable. The article contains experimental data on new French giperplasticizer PREMIA 360 and the findings of how to increase its effectiveness. Also the results of modification PREMIA 360 by the water-soluble adducts of carbon nanoclusters (Astralenes C) together with a new pozzolanic additive - ash shale Zolest Bet are presented and discussed. It was demonstrated the possibility of reduction of the plasticizer concentration twice with the increasing of the modified fine concrete mobility at the same time and substantial increasing in compositions’ strength.