Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''最新文献_第2页

Analysis of probable consequences of cement composite frost destruction 水泥复合材料冻损可能后果分析

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-17 DOI: 10.21285/2227-2917-2023-3-538-544

B. I. Pinus

{"title":"Analysis of probable consequences of cement composite frost destruction","authors":"B. I. Pinus","doi":"10.21285/2227-2917-2023-3-538-544","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-538-544","url":null,"abstract":"The article presents an analysis of variations in the internal resistance of standard and fiberreinforced cement composites under non-stationary low-temperature and humidity effects. Various aspects of the response kinetics of prismatic samples in the monotonous compression mode are considered. The sample set included control samples and those subjected to cyclic freezing and thawing according to their standard frost resistance. Test samples (100 × 100 × 400 mm) were made of conventional (B series) and fiber-reinforced (FB, polypropylene fibers df = 0.8 mm, lf = 40 mm, µf = 1.5 vol%) concrete with a component ratio of cement: sand: crushed stone: water = 1:1.42:3.57:0.55. The accepted base of T-W cycles corresponded to the standard concrete grade in terms of frost resistance, established in control tests (F200). Static tests of composites were preceded by low-temperature exposures according to an accelerated method for assessing frost resistance with a temperature decrease down to minus 35℃ and thawing in a 5% NaCl solution. Samples were automatically loaded (Instron 5989 test complex) according to a special program with a constant deformation rate of 5·10-5 mm/s and continuous recording of deformations. Significant differences were observed in the strength kinetics, magnitude and structure of deformations, along with a high sensitivity and quantitative informativeness of the significant parameters of the strength kinetic concept for solid bodies. The expediency of a differentiated approach to the selection of calculation models and criteria for the temperature and humidity transformations of cement-matrix composites, which takes operational requirements into account, is substantiated.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136077971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preventing technosphere-associated emergencies in the territories of municipalities in the context of climate change 在气候变化背景下，预防市政当局领土内与技术圈有关的紧急情况

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-461-472

I. V. Vlad, V. N. Beznosov

{"title":"Preventing technosphere-associated emergencies in the territories of municipalities in the context of climate change","authors":"I. V. Vlad, V. N. Beznosov","doi":"10.21285/2227-2917-2023-3-461-472","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-461-472","url":null,"abstract":"The present study is aimed at providing systematic assessment and developing preventive measures for adverse technosphere effects emerging in the territories of municipalities in the context of climate change. The study emphasizes the search for methods, organizational-technical measures, and the best available technologies for preventing natural and anthropogenic emergencies, as well as their socio-economic, natural-resource, environmental and other adverse consequences. The paper considers assessing the dynamics, as well as forecasting climate change in environmentally-sensitive areas, taking into account the increasing global temperature associated with technosphere factors of human activity in the urban economy (heat and power engineering, housing and utilities infrastructure, transport, handling of hazardous solid municipal and other wastes). The impact of climate change on the natural environment is analyzed in terms of preventing adverse events and emergencies. Based on the generalization and systematization of materials, the present paper identifies directions and ways of preventing environmental hazards by reducing the technosphere load on the natural environment under the conditions of climate change.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136184257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of pricing in the construction industry: Integrating information modeling technologies and transitioning regions to the resource index method 改进建筑业定价:整合信息建模技术，将区域过渡到资源指数法

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-410-422

N. V. Golovina, M. V. Matveeva

{"title":"Improvement of pricing in the construction industry: Integrating information modeling technologies and transitioning regions to the resource index method","authors":"N. V. Golovina, M. V. Matveeva","doi":"10.21285/2227-2917-2023-3-410-422","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-410-422","url":null,"abstract":"Ensuring accurate cost estimation for project implementation, while accounting for regional specifics, is a crucial task for pricing practices in the construction industry. To address this challenge, the transition from the base index method with cost item indexation to the resource index method for estimating project costs is planned in the 1st quarter of 2023. Additionally, starting from 2024, the mandatory use of information modeling technologies for project design will be implemented. This article examines the rationale behind implementing modifications in the pricing system, outlines the algorithm for estimating costs using the resource index method, identifies the advantages and challenges associate with this new approach, and highlights the prospects of integrating information modeling technologies. The study employs comparative and statistical analysis, as well as methods of synthesis and systematization of information. The analysis of data from the Federal State Information System of Pricing in Construction (TsS FSIS) focuses on regions that have already transitioned to the resource index method. On the basis of the research findings, the article reveals the issues related to the adoption of alternative cost estimation methods in a region. It also proposes approaches for enhancing the pricing system to effectively apply the resource index method for cost estimation in construction projects, while incorporating the use of information modeling technologies (IMT).","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of city readiness for implementation of the smart city concept 评估城市实施智慧城市概念的准备情况

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-423-432

P. A. Petrov, N. S. Khokhlova

{"title":"Assessment of city readiness for implementation of the smart city concept","authors":"P. A. Petrov, N. S. Khokhlova","doi":"10.21285/2227-2917-2023-3-423-432","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-423-432","url":null,"abstract":"Mechanisms for assessing the readiness of urban areas for implementation of the smart city concept are investigated. The relevance of this topic is supported by the request for effective implementation of the concept in the current socio-economic situation. The state attracts much attention to the implementation of state programs and achievement of target indicators. The issue of urban development using modern digital technologies appears to be important, with the relevant ministries paying particular attention to its solution. The paper investigates the existing approaches to the assessment of urban digitalization processes, determines the relationship between the documents of strategic planning and plans for the implementation of state programs. Based on the systems approach, the main directions in assessing the effectiveness of measures on the implementation of the smart city concept in the Russian Federation are classified and formulated. Conclusions on the necessity of adjusting the existing assessment system are made. Options for optimizing and improving the methodology for selecting indicators to assess the effectiveness of city digitalization were developed. As a result, the proposed methodology for assessing the readiness of cities to implement the smart city concept will improve the indicators of the city digitalization project.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of startups through Internet platforms 通过互联网平台对创业公司进行评估

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-433-441

A. S. Sobolev, V. Yu Konyukhov, T. Ya. Druzhinina, V. N. Tarakanovskaya

{"title":"Evaluation of startups through Internet platforms","authors":"A. S. Sobolev, V. Yu Konyukhov, T. Ya. Druzhinina, V. N. Tarakanovskaya","doi":"10.21285/2227-2917-2023-3-433-441","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-433-441","url":null,"abstract":"The situation in the venture capital market is continually changing, as evidenced by the statistics on the use of venture investment pools. Experienced investors, reducing their risks, give preference to firmly established startups that are at intermediate and late stages of development, as well as those in the sphere of IT development and high technologies. This approach leads to a situation when investors do not notice quite a number of interesting, impressive and promising projects at their early and seed stages. In this regard, it is relevant to consider some methods aimed at the evaluation of startups at different stages of their development. The traditional methods of evaluating projects with no operational history are not suitable. The instruments for preparing startup business plans as well as discounting and compounding tools are relevant up to the entry point of the search for financial resources. In a real situation, a perspective innovative startup risks to be taken over as a result of the only available way of mobilising resources – through the inclusion of investors in the startup owners (shareholders) pool. Other traditional sources – internal funds and bank loans – limit a startup’s resource, most often at the seed stage, due to their limited scope and high cost of borrowed capital. As a rule, the borrowed capital in the form of bank loan is basically unavailable for startup initiation due to no ways to ensure repayment guarantees, while the possibility of relying on a business plan for a startup in the process of raising bank funds is a common misconception. In recent years, the impact of the development of specific Internet resources on the structure of investment in economy has been tangible. In addition to innovative ideas in entrepreneurship, a number of instruments specific of new processes in investing are being realised. Business angels, accelerators, startup-oriented Internet resources are shifting to the mechanisms of remote assessment of startup potential and its subsequent funding.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the shear resistance of ground technological quarry roads on loosely-bound subgrades 提高松散路基上地面工艺采石场道路抗剪性能

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-452-460

V. V. Alekseenko, I. I. Volokitin, A. D. Sinyushkin

{"title":"Improving the shear resistance of ground technological quarry roads on loosely-bound subgrades","authors":"V. V. Alekseenko, I. I. Volokitin, A. D. Sinyushkin","doi":"10.21285/2227-2917-2023-3-452-460","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-452-460","url":null,"abstract":"The study aims to solve the urgent problem of strengthening the subgrade of roads for heavy-duty vehicles. In the case of a limited road service life, it appears economically unfeasible to provide a strong cement-concrete subgrade. This case requires a solution maximizing the use of both local materials and production wastes, available in the work area. In order to perform calculations of stresses, arising at a great depth in the subgrade of the technological road under the influence of heavy-duty vehicle wheels, it is necessary to use appropriate mathematical models. In the present study, the calculations were carried out using a software application that implements the method of discrete elements. Using this method, stresses in highly inhomogeneous granular media can be calculated using the first[1]principle approach. The design of road structural layers suggests the use of geocontainers, made of used polypropylene big bags at the subgrade, which, due to their large size, have a greater shear resistance when filled with any soil mixture. The durability of the polypropylene fabric in the roadbed can reach several decades. The main task of the study was to calculate the protective layer of alternated crushed stone, clay soil, and polypropylene fabric. The thickness of layers was selected such that the tensile stresses during the passage of vehicles on the surface of a geocontainer remain within the strength limits of the container shell material.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"967 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136184256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of proposals for improving the pricing of construction products 提出改善建筑产品价格的建议

Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost'' Pub Date : 2023-10-16 DOI: 10.21285/2227-2917-2023-3-442-451

I. V. Yamshchikovа, E. V. Abramenko

{"title":"Development of proposals for improving the pricing of construction products","authors":"I. V. Yamshchikovа, E. V. Abramenko","doi":"10.21285/2227-2917-2023-3-442-451","DOIUrl":"https://doi.org/10.21285/2227-2917-2023-3-442-451","url":null,"abstract":"The purpose of the article is to explore the current situation in the pricing reform as of the 2nd quarter of 2023 using the example of costing for operating machines and mechanisms in calculating the estimated cost on the basis of the resource-and-index method. The methodological basis of the study is represented by economic and statistical analysis, systemic approach, systematisation of theoretical and practical material. The analysis of estimated prices for operation of machines and mechanisms is made on the basis of the ones posted in the Federal State Information System of Construction Pricing as of the 2nd quarter of 2023 and calculated in current prices with the use of estimated cost change indices relative to a group of homogeneous resources. Most of the reviewed examples for basic machinery and mechanisms used in construction show a negative deviation when calculated using the estimated cost change index. The use of prices for the operation of machinery and mechanisms, obtained using the estimated cost change index, can lead to underestimation of costs required for construction and, as a consequence, emergence of obstacles to successful realisation of a construction project. Based on the results of the analysis, proposals have been made to improve the construction products pricing on the basis of due costing for operation of machinery and mechanisms. It is necessary to envisage a number of measures aimed at successful realisation of investment and construction projects and due development of the construction sector as a whole.","PeriodicalId":32211,"journal":{"name":"Izvestia Vuzov Investicii Stroitel''stvo Nedvizimost''","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0