Cement Wapno Beton最新文献_第7页

Electromagnetic wave-absorbing properties of graphene nanoplatelets - calcium sulfoaluminate cement - based composites 石墨烯纳米薄片-硫铝酸钙水泥基复合材料的电磁波吸收性能

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.1.6

L. Xingjun, Y. Duan, Guoqing Chen

引用次数: 0

Effect of copper slag on mechanical and durability aspects for different strength concretes 铜渣对不同强度混凝土力学性能和耐久性的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.10

M. Velumani, K. Kumar

引用次数: 5

Analysis of the environmental impact of the production of building gypsum using natural and flue gas desulfurization gypsum in the Polish context 分析了波兰使用天然石膏和烟气脱硫石膏生产建筑石膏对环境的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.8

Sebastian Czernik, Mariusz Hynowski, Bartosz Michałowski, J. Michalak, M. Piasecki, J. Tomaszewska

{"title":"Analysis of the environmental impact of the production of building gypsum using natural and flue gas desulfurization gypsum in the Polish context","authors":"Sebastian Czernik, Mariusz Hynowski, Bartosz Michałowski, J. Michalak, M. Piasecki, J. Tomaszewska","doi":"10.32047/cwb.2021.26.2.8","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.2.8","url":null,"abstract":"The production of construction products is associated with energy and raw materials consumption, including those of natural origin. Their use is associated with the generation of significant quantity of waste and the emission of greenhouse gases. Therefore, for the sustainable development of civilization, it is essential to reduce the environmental impact of construction products. Gypsum is one of the primary mineral binders, commonly used in construction. The study compares the effect on the environment of building gypsum made of natural raw materials and gypsum obtained in the flue gas desulfurization process. Nine environmental impact indicators were analyzed: global warming potential – GWP, stratospheric ozone layer depletion potential – ODP, soil and water acidification potential – AP, eutrophication potential – EP, tropospheric ozone formation potential – POCP, abiotic depletion potential for non-fossil resources – ADP-elements and fossil resources-ADP-fossil fuels, total use of renewable primary energy resources – PERT and total use of non-renewable primary energy resources – PENRT. Higher values of all considered indicators were obtained for building gypsum made of raw material from flue gas desulfurization processes. The environmental impact assessment was carried out using the Life Cycle Assessment [LCA] method and actual production data from 2017. The life cycle analyzed in this paper covered modules from A1 to A3, i.e., from the extraction/acquisition of raw materials to the finished product, delivered to the factory gate.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"63 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89548652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical performance of engineered cementitious composites developed with different modulus fibers 不同模量纤维的工程胶凝复合材料力学性能研究

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.6.4

A. R. Krishnaraja, M. Harihanandh, S. Anandakumar

引用次数: 0

Nanosilica role in concrete containing iron oxides aggregates and boron carbide as a shield against gamma rays 纳米二氧化硅在含氧化铁集合体和碳化硼的混凝土中作为屏蔽伽马射线的作用

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.3.4

Majid Safamehr, M. Izadinia, S. Hashemi, Saeideh Koohestani

{"title":"Nanosilica role in concrete containing iron oxides aggregates and boron carbide as a shield against gamma rays","authors":"Majid Safamehr, M. Izadinia, S. Hashemi, Saeideh Koohestani","doi":"10.32047/cwb.2021.26.3.4","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.3.4","url":null,"abstract":"Two families of heavy concrete were investigated in this project, the first containing hematite and the second magnetite aggregates. Boron carbide also replaced cement in mass of 2.5, 5 and 10%. Once again, in these compounds the content of cement was reduced by 5% and replaced by nanosilica. Such parameters as compressive strength, ultrasonic pulse velocity and density were investigated, and the specimens were irradiated with cobalt 60, to quantify the linear attenuation coefficient. Using iron ore aggregate, especially magnetite, was advantageous for all the above-mentioned parameters, while the opposite was true, when boron carbide was added to the mix. The addition of nanosilica compensated the decrease in compressive strength of concrete due to the presence of boron carbide, but reduced the linear attenuation coefficient by about 4%. However, the properties of the mixes containing boron carbide and nanosilica, were always better than those of conventional concretes. To quantify the linear attenuation coefficient, Monte Carlo simulations were performed, and their results turned out to be in good agreement with those obtained by the experimental measurements.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"3 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87731057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Simultaneous attenuation of gamma ray and neutrons in single layer concrete shield 单层混凝土屏蔽层中伽马射线和中子的同时衰减

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.6.5

Majid Safamehr, M. Izadinia, Seyed Hamid Hashemi, Seyed Jalil Hoseini

{"title":"Simultaneous attenuation of gamma ray and neutrons in single layer concrete shield","authors":"Majid Safamehr, M. Izadinia, Seyed Hamid Hashemi, Seyed Jalil Hoseini","doi":"10.32047/cwb.2021.26.6.5","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.6.5","url":null,"abstract":"The ability to create various compounds has made concrete one of the most suitable materials for constructing radiation shields. In this investigation, hematite and magnetite aggregates were used to replace ordinary aggregate, separately and completely in two stages. Boron carbide was also substituting cement at percentages of 2.5, 5, and 10 by mass. The density test, gamma irradiation with Co 60 and neutron irradiation with Am-Be 241 were performed. According to the results, the replacement of ordinary aggregates with hematite aggregates in concrete, improved the linear attenuation coefficient and macroscopic cross section by 17% and 73%, respectively. These parameters increased by 37% and 105%, respectively, by the use of magnetite aggregates. Moreover, with the addition of a maximum of 10% boron carbide to the concrete, the macroscopic cross-section increased by 120%, however, the linear attenuation coefficient decreased by between 5% and 8%. This means that it is possible to have a suitable attenuation of gamma ray and neutron beams in a single layer of concrete shield simultaneously. In addition, the results of the tests and Monte Carlo simulation were found to have good consistency.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"41 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75437520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparative study of shear strength of monolithic geopolymer concrete interface 整体式地聚合物混凝土界面抗剪强度对比研究

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.1.1

B. Sumanth Kumar, D. Rama Seshu

引用次数: 4

The application of automotive glass waste in the production of epoxy polymer concrete 汽车玻璃废料在环氧聚合物混凝土生产中的应用

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.5.4

J. Smoleń, Berk Değirmenci, Berke Doğuş Tekeli, Bartłomiej Nowacki

{"title":"The application of automotive glass waste in the production of epoxy polymer concrete","authors":"J. Smoleń, Berk Değirmenci, Berke Doğuş Tekeli, Bartłomiej Nowacki","doi":"10.32047/cwb.2021.26.5.4","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.5.4","url":null,"abstract":"In this paper, the production of aggregate from car windshield cullet and the use of this aggregate, in various compositions with fine quartz sand, as the reinforcing phase of the epoxy matrix polymer concrete were used and the obtained samples were tested. The bending and compressive strength, Charpy’s impact resistance tests were performed on the obtained composites. The porosity, water absorption, and density were also determined. The tests performed have shown that the application of car windshield cullet in polymer concrete, seems to be a good way to recycle this waste. The highest compressive strength, equal to 101 MPa, was obtained by composites containing 20 vol% of milled glass. It is nearly 7 times higher than the value of traditional concrete tested simultaneously, which has about 15 MPa. The highest flexural strength was noted for the composite containing 35 vol% of the glass. Polymer concrete samples did not show high impact resistance, which was in the range of 5.85 - 10.13 kJ/m2 . However, it increases with increasing glass content and the highest value was obtained for the composite containing 50% of the glass volume. Among the polymer concrete samples, the best properties were obtained for the mixture of 35% sand, 35% ground glass and 30% epoxy resin. Open porosity of traditional concrete is 15.9%, and for polymer concrete it was lower than 0.38%. The large difference in open porosity and water absorption for traditional concrete and polymer concrete, allow us to conclude that the latter will have higher frost resistance. The test results clearly show the significantly better mechanical properties of polymer concrete than of traditional concrete.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"30 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85259783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of novel chitosan/modified zeolite nanocomposites and their effect on the mechanical properties of cement mortars 新型壳聚糖/改性沸石纳米复合材料的合成及其对水泥砂浆力学性能的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.6.7

S. Karakuş, I. Sanrı Karapınar, Onur Pehlivan, Ayşe Elif Özsoy Özbay, U. Yazgan

引用次数: 0

Effect of flakiness of coarse aggregate on concrete 粗集料剥落对混凝土性能的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.9

Süleyman Karahan, H. Güneyli, Aslιhan Güneyli

{"title":"Effect of flakiness of coarse aggregate on concrete","authors":"Süleyman Karahan, H. Güneyli, Aslιhan Güneyli","doi":"10.32047/cwb.2021.26.2.9","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.2.9","url":null,"abstract":"The effect of flakiness, one of the shape property of aggregate on concrete, is not an issue sufficiently clarified. In addition, there are no satisfactorily detailed limitations for flakiness on a global scale. This study, in which limestone was used as an aggregate, describes the dependence of flakiness on the concrete behaviour both in the fresh and hardened state. In this context, slump tests in the fresh state and compressive strength tests in the hardened state at 7, 28 and 60 days were carried out using concrete mixes prepared in the same design and with different fl akiness percentages. An increase of flaky particle fraction in coarse aggregate caused flocculation and segregation leading to the inhomogeneity of concrete mix. The slump of the mix decreased markedly as the flakiness increased, and an increase in flakiness by 25% resulted in an average reduction of 18 mm in the slump value. The test results indicated that the compressive strength of concrete decreased significantly with increasing flakiness. According to these negative linear relationships with strong correlation coefficients, an increase in the flaky coarse particles by 25% led to a decrease in compressive strength of average 0.9, 0.4 and 1.2 MPa for the curing times of 7, 28 and 60 days, respectively. Furthermore, the increase in flakiness enhanced particularly the range and standard deviation of compressive strength values with the same flakiness percentage, which this trend was most pronounced and meaningful at 60 days. This phenomenon exhibits that the differences and uncertainty in the compressive strength of the concrete specimens with the same flakiness percentage, increase distinctly with the increase in the flakiness.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"8 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87508821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1