The high water demand of high-plastic and mushy consistency of concrete with high value of water-to-cement ratio leads to decreasing of consistency value and strength of concrete and also to shrinkage of concrete increasing. The known ways of excess water removal from the mix of concrete ingredients with water are labor-consuming and not always effective enough. We suggest the way of excess water removal using loose moisture capable materials which are enabled to absorb water intensively when contacting the concrete mix. The capacity of powder-like materials to absorb water can be evaluated with maximum molecular moisture capacity and maximum capillary moisture capacity measurement units. Also the criterion of water absorbing capacity of powders is suggested, and the most effective loose moisture capable material between others is defined.

Keywords: water absorbing capacity criterion, loose powder-like materials, concrete mix, water absorbing capacity

"The article presents a new method for preparing fine-grained concrete mixtures. The mixture contains Portland cement, silica sand, disperse mineral micro stuff agent and additive superplasticizer. How micro stuff agent used opal - carbonate- kristabolitovyh kremnizemistyh flasks. As a plasticizer was injected superplasticizer POLYPLAST SP-1. New method of preparing fine-grained concrete mix is enclosed in a change of the order of mixing the components and homogenizing. The concrete mixture should be mixed in two stages. The first stage was stirred cement, micro stuff agent, a portion quartz sand and a portion of the mixing water. In the second stage added the rest of the sand, water and superplasticizer. Then finally all the components are stirred until a homogeneous mixture. This method provides reduction of cement consumption by 15% and the superplasticizer by 25%. The proposed method is protected by patent for the invention № 2535321. "

Keywords: fine-grained concrete. disperse mineral micro stuff agent. additive superplasticizer, the method of preparation of the mixture

In this paper, the influence of different types of fine ground mineral fillers. Additives introduced in the composition of fine-grained concrete. Selected effective filler based on the local opal-cristobalite of the flask. Set its optimal dosage. As a binder used Portland cement CEM I 42,5 R (Turkey). As the filler used local fine sand with a fineness modulus of Mк 1,12. As additives used opal-cristobalite of the flask, waste slag, ceramsite dust, ground quartz sand. The optimum number of flasks of 0.3 – 0.6 m.p. The use of the flask was increased about 2 times the strength of concrete in bending. The compressive strength increased by 40%.

Keywords: fine-grained concrete, fine ground mineral filler