Experience of the countries with stable market economy shows that the economic efficiency of construction depends on the organization of works based on the work schedules. In schedules the minimum indicators of value of works and period of their realization depend on the appropriate distribution of manpower and technical resources. Primary problems of reducing the construction cost, while maintaining its high quality are: timeliness of input of objects in operation and improvement of the work organization. Our studies have been aimed at a project cost reduction by optimizing the scheduling and organization of the construction process, i.e., through the development and application of the most efficient models of construction operations management considering the works at the level of simple technological processes and using the modern software products was done. According to the results of study the cost-effective methods are suggested to improve the construction scheduling. The improved methods of construction scheduling by considering the works at the level of simple technological processes can improve the organizational and economic feasibility of construction projects.

Self-compacting concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction. Thermal treatment (TT) of SCC can significantly accelerate the strength growth during cast-in-situ construction. This paper presents a technology of TT of structures for cast-in-situ construction with SCC. Application of this technology allows to reduce the turnover of formwork, the labor costs for construction, and the construction period. We also studied the issue of strength development of SCC during TT. For our study, we used SCC of grade C25. Test samples were cured with TT by infrared radiators for 7, 9, 11, 13, 16 and 24 hours. Then warmed samples were tested for compressive strength after 0.5, 4, 12 and 24 hours of cooling period. Study was carried out on the basis of analyzing, generalizing and evaluations of experimental data. A mathematical model is proposed for determining the compressive strength of SCC after one day of curing of SCC with TT.

The speed of concrete curing and design concrete strength depend on the environmental conditions of construction site. Dry and hot climate conditions intensify the process of water evaporation from concrete and cause the concrete shrinkage and the loss of the potential concrete strength. The research work is devoted to study the layer changes of the concrete strength; determination of the minimum period of care for concrete; assessment of negative impact of dry and hot climate conditions on modified concretes, prepared on the composite binders with various chemical additives. The results and methodology, as well as the information about concrete composition and the boundary conditions of the experiments are given in the research work. The obtained research results show that chemical additives and composite binders with low water consumption contribute to get the design strength in spite of the environmental conditions. They also allow concluding that the minimum period of care for concrete should be determined by not the time of its curing, but the critical strength, which it gets to the moment of ending of caring. This concrete strength is able to resist various destructive processes.