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CONCRETE ON QUARTZITE AGGREGATES 石英石骨料混凝土
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.093
S. Tolmachov
{"title":"CONCRETE ON QUARTZITE AGGREGATES","authors":"S. Tolmachov","doi":"10.23939/jtbp2023.02.093","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.093","url":null,"abstract":"In the post-war period, Ukraine will need a large number of aggregates to repair and rebuild destroyed and damaged objects of transport infrastructure, including roads, airfields, and parking lots. To expand the raw material base of such construction, in addition to traditional high-quality aggregates from crushed granite, quartz sand and manufactured sand, it is advisable to use some types of waste and secondary products from various industries. They must meet the basic requirements for density, strength, frost resistance. These include a by-product of iron ore mining, quartzite. The use of quartzites as aggregates for cement concretes has certain difficulties due to their characteristics. This is reflected, first of all, on the strength of the concretes in which they are included. In this article, the features of the influence of quartzite aggregates on the strength of cement concretes are considered. Studies that have been carried out on mixtures of different mobility have shown that dusty particles, which are part of quartzite, have a positive effect on the structure of concrete.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954966","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
PERSPECTIVES AND SPECIFIC FEATURES OF THE USE OF COMPOSITE MATERIALS FOR STRENGTHENING OF DAMAGED REINFORCED CONCRETE STRUCTURES 使用复合材料加固受损钢筋混凝土结构的前景和特点
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.027
N. Kopiika, Y. Blikharskyy
{"title":"PERSPECTIVES AND SPECIFIC FEATURES OF THE USE OF COMPOSITE MATERIALS FOR STRENGTHENING OF DAMAGED REINFORCED CONCRETE STRUCTURES","authors":"N. Kopiika, Y. Blikharskyy","doi":"10.23939/jtbp2023.02.027","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.027","url":null,"abstract":"The need for strengthening of existing structures has recently become topical. Composite materials due to their remarkable properties, possibility to adaptation to the design requirements and facilitation of restoration measures are widely used for strengthening. This article is focused on review of restoration approaches with the use of composite materials and specific features of their behavior under various impacts. Study includes analysis of recent studies in the area, identifying gaps of knowledge and perspectives for further research. The most relevant areas of research were distinguished including numerical finite element modelling for parametric analysis, deepening of understanding of composites` linearly elastic behavior, approaches to prevent delamination failure. Further thorough research in this area is strongly recommended to deepen the knowledge and maximize the efficiency of use of composite strengthening systems.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"36 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138955724","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
FEATURES OF THE MIX TIME OF BITUMEN EMULSIONS WITH CEMENT FOR SLURRY SURFACING TECHNOLOGY 沥青乳液与水泥的混合时间对水泥浆铺面技术的影响
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.012
Iurii Sidun, Khrystyna Sobol, Y. Novytskyi, Sergii Rybchynskyi
{"title":"FEATURES OF THE MIX TIME OF BITUMEN EMULSIONS WITH CEMENT FOR SLURRY SURFACING TECHNOLOGY","authors":"Iurii Sidun, Khrystyna Sobol, Y. Novytskyi, Sergii Rybchynskyi","doi":"10.23939/jtbp2023.02.012","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.012","url":null,"abstract":"Pavement grade cationic bitumen emulsions formulations were developed for Slurry Surfacing based on orthophosphoric and hydrochloric acids with both all-purpose and specialized emulsifiers used. As a result, there were established relations of mix time upon cement - for Slurry Surfacing based on various acids and emulsifiers. Mix time of Slurry Surfacing mix (having different cement content) with bitumen emulsions on both orthophosphoric and hydrochloric acids is characterized by parabolic relation, branches of the parabola going down. Still, parabola slope steepness for Slurry Surfacing with cement and bitumen emulsions on orthophosphoric acid is higher than for emulsions on hydrochloric acid. The regularity investigated allows affirming that dosing cement for Slurry Surfacing with orthophosphoric-based bitumen emulsions shall be more diligently checked and controlled – so as to avoid the premature mix time.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"392 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139170762","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
PRACTICAL APPROACH TO THE RISK ANALYSIS OF CONSTRUCTION PROJECTS 建筑项目风险分析的实用方法
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.077
Dariusz Walasek
{"title":"PRACTICAL APPROACH TO THE RISK ANALYSIS OF CONSTRUCTION PROJECTS","authors":"Dariusz Walasek","doi":"10.23939/jtbp2023.02.077","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.077","url":null,"abstract":"A construction risk assessment is the calculated process of identifying project specific threats on a jobsite, then analysing and evaluating each risk factor to determine the likelihood, impact, and repercussions of each of those variables. That assessment creates awareness surrounding the risks/hazards identified, assess current risk prevention measures that are in-place to determine if they are sufficient or if further action needs to be taken, ensuring that any legal requirements or contract requirements are being met regarding risk and also deciding if additional controls need to be implemented or if changes need to be made to construction risk management strategy.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"43 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138957378","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
THE HARVESTED RAINWATER AS A SOURCE OF NON-DRINKING WATER SUPPLY IN TYPICAL RESIDENTIAL MICRODISTRICTS OF UKRAINIAN CITIES 将收集的雨水作为乌克兰城市典型微型住宅区的非饮用水供应来源
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.061
Lesya Vovk, V. Orel, Anastasiia Tarkanii
{"title":"THE HARVESTED RAINWATER AS A SOURCE OF NON-DRINKING WATER SUPPLY IN TYPICAL RESIDENTIAL MICRODISTRICTS OF UKRAINIAN CITIES","authors":"Lesya Vovk, V. Orel, Anastasiia Tarkanii","doi":"10.23939/jtbp2023.02.061","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.061","url":null,"abstract":"Ukraine, facing water resource scarcity, finds it increasingly challenging to provide high-quality drinking water for both its population and industries, particularly in times of war. Harvested rainwater, among these sources, aligns well with water resource protection and management measures to counteract drinking water shortages. A literature review indicates that domestic needs in cities (flushing toilets, cleaning, and laundry) account for over 50% of drinking water demand, which could be supplemented by harvested rainwater. The estimated volume of harvested rainwater for a residential building in Odesa and Uzhgorod showed a drinking water saving to 15% and 36.5%, respectively. Similar calculations were carried out for residential microdistricts with high-rise buildings in these cities, showing a saving of drinking water due to the use of rainwater to 9% and 19%, respectively.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"25 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138955878","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
INJECTION OF CRACKS IN A RC BEAM WITH EPOXY RESIN USING THE GRAVITY FLOW METHOD 用重力流法为钢筋混凝土梁注入环氧树脂裂缝
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.085
Andrii Klym, Y. Blikharskyy
{"title":"INJECTION OF CRACKS IN A RC BEAM WITH EPOXY RESIN USING THE GRAVITY FLOW METHOD","authors":"Andrii Klym, Y. Blikharskyy","doi":"10.23939/jtbp2023.02.085","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.085","url":null,"abstract":"The restoration of the load-bearing capacity of RC beams through crack injection is one of the most efficient and practical methods for executing repairs in the field of civil engineering. In the article, following an analysis of crack injection methods in RC structures, an economically viable method for injecting RC beams is proposed. The core approach of the proposed crack injection method involves the process of introducing epoxy resin into the crack, which occurs by gravity flow (without specialized equipment and pressure). The paper outlines a systematic process for preparing the crack in the RC beam for epoxy resin injection. The crack injection method was conducted comprehensively, including the restoration of the compressed concrete zone within the RC beam. The test results demonstrated the effectiveness of the crack injection method, as there were no new crack formations at the injection sites, and the load-bearing capacity of the RC beam was restored to 115%.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"122 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953820","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
OVER-STABILIZED BITUMEN EMULSIONS MADE FROM EMULSIFIERS FOR SLOW-SETTING EMULSIONS 用乳化剂制成的过稳定沥青缓凝乳剂
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.042
Volodymyr Bidos, Iurii Sidun, Khrystyna Sobol, Sergii Rybchynskyi
{"title":"OVER-STABILIZED BITUMEN EMULSIONS MADE FROM EMULSIFIERS FOR SLOW-SETTING EMULSIONS","authors":"Volodymyr Bidos, Iurii Sidun, Khrystyna Sobol, Sergii Rybchynskyi","doi":"10.23939/jtbp2023.02.042","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.042","url":null,"abstract":"Formulations of road over-stabilized cationic bitumen emulsions with orthophosphoric, sulfuric and hydrochloric acids and cationic emulsifiers for slowly disintegrating emulsions have been designed. The physical and mechanical properties of the manufactured over-stabilized bitumen emulsions and their breaking behavior were determined. It has been established that over-stabilised bitumen emulsions demonstrate good storage stability for 180 days. The obtained results of breaking behavior bitumen emulsions indicate that emulsions based on hydrochloric and sulfuric acid have a shorter fines mixing time and greater mixing stability with cement than emulsions based on orthophosphoric acid. For over-stabilized bitumen emulsions on orthophosphoric acid, the method according to DSTU EN 12848:2020 is not effective, due to the high reactivity of emulsions on orthophosphoric acid during interaction with portland cement.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"109 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954128","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
METHOD OF ARRANGEMENT OF INTERNAL THERMAL INSULATION OF EXTERNAL PROTECTIVE STRUCTURES OF THE ROOM 房间外部保护结构的内部隔热布置方法
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.018
V. Labay, Halyna Vereshchynska
{"title":"METHOD OF ARRANGEMENT OF INTERNAL THERMAL INSULATION OF EXTERNAL PROTECTIVE STRUCTURES OF THE ROOM","authors":"V. Labay, Halyna Vereshchynska","doi":"10.23939/jtbp2023.02.018","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.018","url":null,"abstract":"The paper presents the results of a study aimed at increasing energy efficiency in residential buildings, as well as an analysis of the humidity state and the possibility of condensation when using internal insulation. Numerical simulations were performed to confirm the results. The obtained results indicate that the use of mineral insulation \"BETOL®\" and aluminum foil used as a vapor barrier, applied from the inside, contributes to the improvement of thermal insulation of the walls and reduces the risks of condensation. Computer modeling showed that under the formed conditions, condensation is not observed. This research has an important contribution to the development of energy-efficient solutions for the construction industry, as it allows to ensure the minimum permissible value of heat transfer resistance of external enclosures, to extend their service life.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"107 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954213","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
STUDY OF FINE-GRAINED FIBER CONCRETE CRACKING RESISTANCE FROM THE POINT OF VIEW OF DESTRUCTION MECHANICS 从破坏力学角度研究细粒纤维混凝土的抗裂性
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.069
R. Akhmednabiev, Oksana Demchenko, Olha Hukasian
{"title":"STUDY OF FINE-GRAINED FIBER CONCRETE CRACKING RESISTANCE FROM THE POINT OF VIEW OF DESTRUCTION MECHANICS","authors":"R. Akhmednabiev, Oksana Demchenko, Olha Hukasian","doi":"10.23939/jtbp2023.02.069","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.069","url":null,"abstract":"Fiber reinforced concrete began to appear in the market in the 60s of the last century, and since then the interest in this type of reinforcement has been steadily growing. The article presents the results of studies on the crack resistance of concrete reinforced with polypropylene fibers of various lengths and volume concentrations in fine-grained concrete. Waste from the wet magnetic separation of the Poltava mining and concentration plant was used as an aggregate in the concrete. Polypropylene fibers with the various lengths diameter of 0.2 mm were used for reinforcement. The influence of the length and volume concentration of fibers on the crack resistance of the same strength concrete of was studied. The study results indicate that the increase in the length and volume concentration of fibers, within the limits of the experiment, significantly affects the crack resistance of fine-grained concrete.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"80 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954294","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
MONTE CARLO METHODS: A FEATURES REVIEW IN TERMS OF USE FOR ASSESSING THE RELIABILITY OF RC STRUCTURES 蒙特卡洛方法：用于评估遥控结构可靠性的特点综述
Theory and Building Practice Pub Date : 2023-12-20 DOI: 10.23939/jtbp2023.02.048
R. Tytarenko, R. Khmil
{"title":"MONTE CARLO METHODS: A FEATURES REVIEW IN TERMS OF USE FOR ASSESSING THE RELIABILITY OF RC STRUCTURES","authors":"R. Tytarenko, R. Khmil","doi":"10.23939/jtbp2023.02.048","DOIUrl":"https://doi.org/10.23939/jtbp2023.02.048","url":null,"abstract":"Recently, the optimization issue relevance of reinforced concrete (RC) structures design solutions through the maximum use of their bearing capacity resource has increased significantly; in turn, solving this issue depends on a fundamental understanding of the reliability and durability concepts. Because any loads, impacts, or bearing capacity reserve parameters are random variables, there is a need to build stochastic models, which can become the “reliability design” concept base shortly. Among other things, this review article is devoted to the Monte Carlo methods features analysis in terms of their use in the RC members’ reliability assessment tasks. Based on a modern literary sources review, recommendations for further studies of the RC structures’ reliability and durability (including damaged ones) under the conditions of the combined action of loads and a corrosive environment (using Monte Carlo methods) were also formulated.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139168734","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
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