علی هوشمند آیینی

Self-compacting concrete (SCC) is known for its outstanding characteristics such as superior mechanical and durability properties. Corrosion of rebar due to penetration of chloride ions in the reinforced concrete elements is of particular importance. Therefore, this issue in the SCC must be investigated. Pozzolanic materials could be used in the SCC to increase the resistance of concrete against chlorine ion penetration. In this research, effects of pozzolanic materials including micro silica, nano silica, fly ash, rice husk ash, as well as limestone powder on the mechanical and durability characteristics of self-compacting concrete placed in chloride environment have been studied. The results show that nano-silica increases the mechanical and durability characteristics of self-compacting concrete. Moreover, the SCC containing combination of nano-silica and pozzolanic materials has better properties than the one containing nano-silica.

How to finance and prepare the necessary executive budget to carry out infrastructure projects and exploit their products and services is currently one of the most important challenges facing developing countries. In this regard, the present study has been reviewed with the aim of reviewing financing methods and ways of exploiting development projects (case study of the plans of the Ministry of Energy, Water Resources Management). The research method of the present study was applied in terms of purpose and descriptive in terms of implementation method. The statistical population of the present study included contractors, consultants and employers who are experts and experts working in the field of water resources basin, 50 of whom were selected by non-random sampling method and purposefully as a statistical sample. The data collection tool in the present study was a questionnaire and for data analysis, one-sample t-test and Friedman, and SPSS 24 software were used. Based on the research findings, the most important strategies for exploiting development projects are as follows: 1) Improving the quality of the work factor, 2) Improving the relationship between the manager and employees, and 3) Improving the use of technological efficiency. Therefore, the best way to exploit water development projects has been to improve the quality of the work factor.

Thousands of people around the world die each year due to accidents involving safety management. With the development of construction projects in recent years, unfortunately, the statistics of work accidents and injuries and injuries in the country are increasing day by day in developing countries including Iran where safety and health programs Still in their infancy or lacking in performance, the situation is more critical. Developing countries are seeing significant growth in development projects. Factors in the safety management system were identified in a systematic, scientifically based way, followed by a number of people working on water and wastewater through questioning. The letter you are looking for. After collecting the responses, the results were categorized by contractors, technical and safety experts, consultants, employers and insurance companies. The first group is from the perspective of site supervisor contractors by multiple senior managers and providing adequate and adequate resources, the second group is from the perspective of consultants with the right to terminate work in breach of safety, the third group is from the employer's perspective considering the owner's safety to be implemented safely. Projects require that the fourth group, from the perspective of Barzai insurance companies, introduce ongoing projects as one of the most important steps affecting the safety management system in projects.