The article considers the issues of improving the technology of preparing concrete mixtures for road surfaces at existing concrete mixing units without additional costs for their technical re-equipment. The essence of improving the preparation of concrete mixtures lies in the complex use of carbonate microfiller and superplasticizer additives in combination with the developed innovative method of preparing concrete mixture. The article shows that when using a polycarboxylate superplasticizing additive and a microfiller based on porous shell limestone in combination with the proposed method of preparing concrete mixture, it is possible to obtain road concrete with the required strength properties with a cement consumption reduced by 50 kg/m³.

Keywords: road concrete, superplasticizer, mineral micro filler, method of preparation of concrete mix

The results of the technical inspection of the building structures recognized as dilapidated and subject to reconstruction with a positive conclusion of the construction-technical expertise are presented. The program of complex technical diagnostics, including the regulations of the necessary expert and verification work, methods and techniques of examination, recommendations on the choice of modern technical means of measurement and instrumentation is developed. The category of the technical condition of the building was established, and recommendations for strengthening the monolithic reinforced concrete floor slabs were developed.

Keywords: construction expertise, technical inspection, defects, nondestructive testing methods, expert opinion

The article presents a program of comprehensive construction and technical expertise of the structures of an industrial building. The features of the construction and technical expertise of the structures of the agricultural warehouse of mineral fertilizers are described. An algorithm of the sequence of actions for the technical expertise of the structures of the object is developed. Measures have been developed to repair and restore the working condition of damaged structures

Keywords: construction and technical expertise, defects, bearing capacity, structural repair, property management

The results of the investigation of the structure of the concrete, modified by the additive expanding, on the combined aggregate, which is a natural crushed stone mixed with crushed concrete, are presented. The study of the properties and regularities of the formation of the concrete structure is simultaneously a method of controlling their production. Regularities and reasons for the change (decrease) in the quality indices of concretes with a combined aggregate are established. Investigation and normalization of the properties of concretes on combined aggregates will allow using them along with traditional structural concrete.

Keywords: recycling, combined filler, contact area, structure, defects, durability

The article deals with the results of studies of the effect of additives on the grinding intensifiers processes of structure binders. The studies were conducted by X-ray diffraction analysis of the samples of compositions with applicable supplements.

Keywords: slag-alkaline astringent, intensificators of grinding, grinding intensifiers, X-ray analysis, X-ray diffraction, interference maximum

The article deals with the results of studies of the effect of additives on the grinding intensifiers processes of structure binders. The studies were conducted by differential thermal analysis of the samples of compositions with applicable supplements.

Keywords: slag-alkaline astringent, intensificators of grinding, differential thermal analysis , dehydration, endothermic effect, exothermic effect