Pub Date : 2019-10-16DOI: 10.31448/mstj.02.01.2019.50-60
K. Prałat, M. Łukasiewicz, P. Miczko, Katarzyna Lesiecka
Fraunhofer theory The paper contains the results of experimental studies determining the size of grains of ground polymer (polyoxymethylene POM). In the measurements a modern laser diffraction method was used to measure particle diameters. During the experiment, three series of measurements were carried out. Due to its properties, POM can be used as an additive to concrete and gypsum composites, increasing their strength. However, it is necessary to know the size of the polymer grains used. The grain size of building material additives is one of the many aspects that also directly influence the bonding time of composites and therefore determine their usefulness in the building industry. The paper presents an innovative method used in the control of many technological processes, which determines the usefulness of fine-grained fillers for building materials on the basis of their granulation results.
{"title":"Measurement of the distribution of polyoxymethylene particle size using the laser diffraction method","authors":"K. Prałat, M. Łukasiewicz, P. Miczko, Katarzyna Lesiecka","doi":"10.31448/mstj.02.01.2019.50-60","DOIUrl":"https://doi.org/10.31448/mstj.02.01.2019.50-60","url":null,"abstract":"Fraunhofer theory The paper contains the results of experimental studies determining the size of grains of ground polymer (polyoxymethylene POM). In the measurements a modern laser diffraction method was used to measure particle diameters. During the experiment, three series of measurements were carried out. Due to its properties, POM can be used as an additive to concrete and gypsum composites, increasing their strength. However, it is necessary to know the size of the polymer grains used. The grain size of building material additives is one of the many aspects that also directly influence the bonding time of composites and therefore determine their usefulness in the building industry. The paper presents an innovative method used in the control of many technological processes, which determines the usefulness of fine-grained fillers for building materials on the basis of their granulation results.","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131074065","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}
Pub Date : 2019-10-16DOI: 10.31448/mstj.02.01.2019.61-69
Y. Yakymechko, R. Jaskulski, I. Lutsyuk
{"title":"New ways of utilizing lime in modern building technology","authors":"Y. Yakymechko, R. Jaskulski, I. Lutsyuk","doi":"10.31448/mstj.02.01.2019.61-69","DOIUrl":"https://doi.org/10.31448/mstj.02.01.2019.61-69","url":null,"abstract":"","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128521538","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}
Pub Date : 2019-01-08DOI: 10.31448/MSTJ.01.02.2018.42-49
Ondřej Holčapek, Jan Machovec, P. Reiterman
This paper is focused on strengthening of brick masonry columns by thin layer of textile reinforced concrete (TRC). The sets of masonry columns with dimensions 290 × 290 × 1040 mm were produced. These columns were prepared with modified shape of the cross-section to achieve a polygonal shape. This solution brings significant increase of the structure load capacity and efficiency of the applied strengthening. Used TRC consists of micro-concrete with similar properties as high-performance concrete and reinforcement from E-glass. Used textile reinforcement has basic weight 585 g/m 2 with mesh size 5.5 × 4.5 mm, while the average compressive and flexural strength of the used micro-concrete achieved 93.6 MPa and 15.6 MPa respectively. Used masonry achieved characteristics compressive strength 7.2 MPa, the calculation was performed with respect to properties of bricks with dimensions 140 × 65 × 290 mm and used lime-cement mortar. The reinforced fabric was applied in one and three layers and the effect of number of strengthening layers was investigated. Axial loading arrangement was used for the determination of maximal achieved strenght and the efficiency of additionaly applied strengthening layer. It was confirmed that one layer of strenghtening increased the load capacity by nearly 100 %, three layers by over 200 %, respectively. Application of TRC performs efficient procedure for the improvement of load capacity of masonry structures, which could be applied in case of renovation of historical structures.
{"title":"Strengthening of Masonry Pillars by Textile Reinforced Concrete Wrapping of Different Thickness","authors":"Ondřej Holčapek, Jan Machovec, P. Reiterman","doi":"10.31448/MSTJ.01.02.2018.42-49","DOIUrl":"https://doi.org/10.31448/MSTJ.01.02.2018.42-49","url":null,"abstract":"This paper is focused on strengthening of brick masonry columns by thin layer of textile reinforced concrete (TRC). The sets of masonry columns with dimensions 290 × 290 × 1040 mm were produced. These columns were prepared with modified shape of the cross-section to achieve a polygonal shape. This solution brings significant increase of the structure load capacity and efficiency of the applied strengthening. Used TRC consists of micro-concrete with similar properties as high-performance concrete and reinforcement from E-glass. Used textile reinforcement has basic weight 585 g/m 2 with mesh size 5.5 × 4.5 mm, while the average compressive and flexural strength of the used micro-concrete achieved 93.6 MPa and 15.6 MPa respectively. Used masonry achieved characteristics compressive strength 7.2 MPa, the calculation was performed with respect to properties of bricks with dimensions 140 × 65 × 290 mm and used lime-cement mortar. The reinforced fabric was applied in one and three layers and the effect of number of strengthening layers was investigated. Axial loading arrangement was used for the determination of maximal achieved strenght and the efficiency of additionaly applied strengthening layer. It was confirmed that one layer of strenghtening increased the load capacity by nearly 100 %, three layers by over 200 %, respectively. Application of TRC performs efficient procedure for the improvement of load capacity of masonry structures, which could be applied in case of renovation of historical structures.","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"77 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113970290","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}
Pub Date : 2019-01-08DOI: 10.31448/MSTJ.01.02.2018.32-41
Jan Machovec
Cementitious composite 3D concrete printing technology is probably one of the biggest improvements in civil engineering industry recently. It provides engineers with a new way of thinking of the concrete usage. It allows to build attractive structures in a short time, with less human labour and with much less waste. Concrete specimens can be designed in the most efficient way thanks to modern design methods. On the other hand, it brings many problems that did not occur with ordinary reinforced concrete. How can we reinforce printed structures? How strong is the bond between two layers on top of each other? How many layers can we print in a row to keep a desired shape? Can we use one concrete mixture in different weather conditions? All these questions wait to be answered.
{"title":"Introduction to 3D Concrete Printing Technology: A state of the art","authors":"Jan Machovec","doi":"10.31448/MSTJ.01.02.2018.32-41","DOIUrl":"https://doi.org/10.31448/MSTJ.01.02.2018.32-41","url":null,"abstract":"Cementitious composite 3D concrete printing technology is probably one of the biggest improvements in civil engineering industry recently. It provides engineers with a new way of thinking of the concrete usage. It allows to build attractive structures in a short time, with less human labour and with much less waste. Concrete specimens can be designed in the most efficient way thanks to modern design methods. On the other hand, it brings many problems that did not occur with ordinary reinforced concrete. How can we reinforce printed structures? How strong is the bond between two layers on top of each other? How many layers can we print in a row to keep a desired shape? Can we use one concrete mixture in different weather conditions? All these questions wait to be answered.","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"38 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120930328","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}
Pub Date : 2019-01-07DOI: 10.31448/MSTJ.01.01.2018.26-31
P. Figala, R. Drochytka, V. Černý, J. Kolísko
Structure This paper focuses on possibilities of use of selected secondary raw materials for modification of developed high strength coating based on polymer-cement. The aim is achieving the same or better physical-mechanical properties of resulting material at maximal level of substitution of cement with secondary raw materials. Because of high contents of amorphous SiO2 two secondary raw materials were selected: high temperature fly ash and recycled soda-lime glass to replace cement by 20 and 40% by weight. These secondary raw materials were pre-treated in ball grinder to specific surface of the substituted Portland cement CEM I 42.5 R, 300 m∙kg and specific surface 400 m∙kg (±50 m∙kg). Selected test specimens were subjected to compressive strength determination after 3, 28 and 90 days. Samples of selected mix-designs were subjected to Computed Tomography to determine influence of substitution of cement with individual additions on structure of polymer-cement composite. The main finding is that suitable secondary raw materials can successfully substitute binder to the extent of 40%; in case of fly ash, the compressive strength after 28 days was higher by 10% and in case of ground glass by 12%. At the same time, positive influence of ground glass on density and integrity of the cement stone was proved. Based on the findings it can be stated that suitable secondary raw materials are capable of enhancing properties of the developed high strength coat. The main result is enhancement of basic physico-mechanical properties and at the same time achieving better structure of the coat, which is the elementary condition for high chemical resistance of cement based composite material.
本文重点介绍了所研制的聚合物水泥高强涂料选用二次原料进行改性的可能性。目的是在最大程度上用二次原料替代水泥的情况下，获得相同或更好的物理力学性能。由于无定形SiO2含量高，选择了高温粉煤灰和再生钠石灰玻璃两种二次原料，分别替代水泥重量的20%和40%。这些二次原料在球磨机中预处理至替代波特兰水泥CEM I 42.5 R的比表面300 m∙kg，比表面400 m∙kg(±50 m∙kg)。选取的试件分别在3、28和90天后进行抗压强度测定。选定的混合设计样品进行了计算机断层扫描，以确定用单个添加物取代水泥对聚合物-水泥复合材料结构的影响。主要发现:合适的二次原料可成功替代粘合剂达40%;粉煤灰掺加28天后抗压强度提高10%，磨砂玻璃掺加28天后抗压强度提高12%。同时也证明了磨砂玻璃对水泥石的密度和完整性有积极的影响。研究结果表明，选用合适的二次原料可以提高所制备的高强度涂层的性能。其主要结果是提高了水泥基复合材料的基本物理力学性能，同时涂层的结构也得到了改善，这是水泥基复合材料具有高耐化学性的基本条件。
{"title":"Structure of Polymer-cement Composite optimized with Secondary Raw Materials","authors":"P. Figala, R. Drochytka, V. Černý, J. Kolísko","doi":"10.31448/MSTJ.01.01.2018.26-31","DOIUrl":"https://doi.org/10.31448/MSTJ.01.01.2018.26-31","url":null,"abstract":"Structure This paper focuses on possibilities of use of selected secondary raw materials for modification of developed high strength coating based on polymer-cement. The aim is achieving the same or better physical-mechanical properties of resulting material at maximal level of substitution of cement with secondary raw materials. Because of high contents of amorphous SiO2 two secondary raw materials were selected: high temperature fly ash and recycled soda-lime glass to replace cement by 20 and 40% by weight. These secondary raw materials were pre-treated in ball grinder to specific surface of the substituted Portland cement CEM I 42.5 R, 300 m∙kg and specific surface 400 m∙kg (±50 m∙kg). Selected test specimens were subjected to compressive strength determination after 3, 28 and 90 days. Samples of selected mix-designs were subjected to Computed Tomography to determine influence of substitution of cement with individual additions on structure of polymer-cement composite. The main finding is that suitable secondary raw materials can successfully substitute binder to the extent of 40%; in case of fly ash, the compressive strength after 28 days was higher by 10% and in case of ground glass by 12%. At the same time, positive influence of ground glass on density and integrity of the cement stone was proved. Based on the findings it can be stated that suitable secondary raw materials are capable of enhancing properties of the developed high strength coat. The main result is enhancement of basic physico-mechanical properties and at the same time achieving better structure of the coat, which is the elementary condition for high chemical resistance of cement based composite material.","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130014699","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}
Pub Date : 2018-09-24DOI: 10.31448/mstj.01.01.2018.1-9
{"title":"Comparative analysis of dependence of the elastic modulus of concrete on its composition","authors":"","doi":"10.31448/mstj.01.01.2018.1-9","DOIUrl":"https://doi.org/10.31448/mstj.01.01.2018.1-9","url":null,"abstract":"","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131868546","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}
Pub Date : 2018-09-24DOI: 10.31448/mstj.01.01.2018.18-25
{"title":"H2 generation in cement pastes under gamma irradiation: A state of the art","authors":"","doi":"10.31448/mstj.01.01.2018.18-25","DOIUrl":"https://doi.org/10.31448/mstj.01.01.2018.18-25","url":null,"abstract":"","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115028037","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}
Pub Date : 2018-09-24DOI: 10.31448/mstj.01.01.2018.10-17
{"title":"Influence of environmental impacts on sorptivity of concrete with CEM II/B-V and CEM III/A cement","authors":"","doi":"10.31448/mstj.01.01.2018.10-17","DOIUrl":"https://doi.org/10.31448/mstj.01.01.2018.10-17","url":null,"abstract":"","PeriodicalId":192883,"journal":{"name":"Materials Structures Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129846529","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}
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