Cement Wapno Beton最新文献_第5页

Performance of concrete containing recycled masks used for personal protection during SARS-CoV-2 coronavirus pandemic 含SARS-CoV-2冠状病毒大流行期间用于个人防护的再生口罩的混凝土性能

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2022-01-01 DOI: 10.32047/CWB.2022.27.1.1

M. Koniorczyk, Dalia Bednarsk, Iman Abbasi Nattaj Omrani, A. Masek, S. Cichosz

引用次数: 0

Effect of different cement content and water cement ratio on carbonation depth and probability of carbonation induced corrosion for concrete 不同水泥掺量和水灰比对混凝土碳化深度和碳化诱发腐蚀概率的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2022-01-01 DOI: 10.32047/cwb.2022.27.2.4

Mostafa Hasan, L. Amleh, H. Othman

{"title":"Effect of different cement content and water cement ratio on carbonation depth and probability of carbonation induced corrosion for concrete","authors":"Mostafa Hasan, L. Amleh, H. Othman","doi":"10.32047/cwb.2022.27.2.4","DOIUrl":"https://doi.org/10.32047/cwb.2022.27.2.4","url":null,"abstract":"Nowadays transportation infrastructure is subjected to a high percentage of carbon dioxide emissions. CO 2 greatly affects the carbonation depth of concrete, which can affect the deck for reinforced concrete bridges causing corrosion to steel reinforcement. Cement content and water to cement ratio greatly influence the carbonation depth of concrete. This study aims to investigate the effect of climate change on carbonation depth by considering different Representative Concentration Pathways [RCPs]. In addition, the effect of different compressive strengths on the carbonation depth was investigated in this research. Additionally, the effect of different cement contents on the probability of carbonation-induced corrosion has been investigated. Two parameters are considered, namely, the cement content 400 kg/m3, 350 kg/m3, and 250 kg/m3 and, the water to cement ratio [0.45 and 0.55]. This study RCPs for CO2 concentrations. The RCP [2.6, 4.5, 6, and 8.5] trajectory was used by the Intergovernmental Panel on Climate Change [IPCC], which represents low emission pathways, intermediate emission pathways, and high emission pathways, respectively. Carbonation depth has been estimated using Yoon’s and Stewart’s equations. Furthermore, the probability of carbonation-induced corrosion has been investigated using Monte Carlo simulation and the first-order reliability method at different cement contents for RCP 8.5. The percentage increase in the carbonation depth using Yoon’s compared to Stewart’s equations for concrete mixes which consist of different water to cement ratios and cement content for the years 2025 and 2100 for both RCP 2.6 and RCP 8.5 were calculated. Finally, the probability of carbonation-induced corrosion conducted by FORM for cement content of 250 kg/m3 has been increased by 18% compared to the probability of carbonation including cement content equal to 400 kg/m 3 for the year 2100.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"374 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84944500","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

Effect of selected organic additives on the properties of magnesia-chromite refractories 有机添加剂对镁铬铁矿耐火材料性能的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2022-01-01 DOI: 10.32047/cwb.2022.27.4.4

Eryk Goldmann, Aleksandra Kostrzanowska-Siedlarz, M. Górski, B. Klemczak

引用次数: 0

Specifi city of precast fl oor design, on the example of the hollow-care slabs 具体对城市预制楼板进行设计，以空心楼板为例

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2022-01-01 DOI: 10.32047/cwb.2022.27.3.4

W. Derkowski, Miłosz Jezierski

引用次数: 0

Assessment of the possibility of using the measurement of open time to assess and verify the constancy of performance of cementitious ceramic tile adhesives 利用开放时间的测量来评估和验证胶凝瓷砖胶粘剂性能稳定性的可能性评估

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2022-01-01 DOI: 10.32047/cwb.2022.27.4.1

C. Stancu, Dawid Dębski, J. Michalak

{"title":"Assessment of the possibility of using the measurement of open time to assess and verify the constancy of performance of cementitious ceramic tile adhesives","authors":"C. Stancu, Dawid Dębski, J. Michalak","doi":"10.32047/cwb.2022.27.4.1","DOIUrl":"https://doi.org/10.32047/cwb.2022.27.4.1","url":null,"abstract":"The study analyzed the results of open time measurements of ceramic tile adhesives after not less than 30 minutes, obtained by 27 laboratories participating in the interlaboratory comparison program. The obtained results were statistically analyzed following the requirements of ISO 13528 and assessed under the z-score analysis criteria contained in the EN ISO/IEC 17043. 22 out of 24 laboratories that sent the results of the open time measurement confirmed their competencies, obtaining a “satisfactory” result following the evaluation criteria. The result obtained by one laboratory was classified as “questionable”, and another received the result as “unsatisfactory”. From the perspective of laboratories participating in interlaboratory comparisons, the obtained results should be assessed as satisfactory, and thus the laboratories confirm their competence. However, a wide scatter of the results of the open time measurement should be noted – 22 laboratories, the results of which were classified as “satisfactory”, obtained results from 0.1 N/mm2 to 1.0 N/mm2. Such a wide scatter of the results of open time measurements determined by the adhesion strength indicates that this method has too little accuracy, and it should not be used in the assessment and verification of constancy of performance of ceramic tile adhesives.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"11 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82307796","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

Investigating the mechanical properties and durability indices of concrete containing Fe3O4/SiO2/GO and GO nanoparticles 研究了含Fe3O4/SiO2/GO和氧化石墨烯纳米颗粒混凝土的力学性能和耐久性指标

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.1.7

Mehdi Saliani, A. Honarbakhsh, R. Zhiani, S. M. Movahedifar, A. Motavalizadehkakhky

{"title":"Investigating the mechanical properties and durability indices of concrete containing Fe3O4/SiO2/GO and GO nanoparticles","authors":"Mehdi Saliani, A. Honarbakhsh, R. Zhiani, S. M. Movahedifar, A. Motavalizadehkakhky","doi":"10.32047/cwb.2021.26.1.7","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.1.7","url":null,"abstract":"Recent research in the construction industry justifi es the partial replacement of cement by nanomaterials. Graphene oxide na-nocomposite is a material that has been recently proposed as a suitable alternative for part of cement in concrete. However, there is no research on the addition of these synthetic compounds to concrete, and little is known about the effect of these materials on the mechanical and durability properties of concrete. Therefore, in this laboratory study, the synthesis of Fe3O4/SiO2/GO and GO nanoparticles was performed and confi rmed with FT-IR, SEM, TEM analyses. These nanoparticles partially replaced cement by 1, 2, 3, and 4 % by mass of the cement, and their effect on mechanical and durability properties of concrete at the ages of 7, 28, and 90-day, were investigated. The results suggest that mixtures in which 2% Fe3O4/ SiO2/GO and 3% GO substituted cement yielded the best results in the mechanical properties tests. Concrete containing Fe3O4/SiO2/GO nanoparticles enhanced compressive strength by 14% and splitting tensile strength by 12% after 28-days of curing. Also, concrete containing 2% Fe3O4/SiO2/GO, had the highest re-sistance to an acidic environment, the lowest permeability, and the highest transient pulse velocity in the ultrasonic test, compared to the specimen containing GO nanoparticles and the control sample.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"115 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89120771","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

An Economical Engineered Cementitious Composite (ECC) prepared with fine quarry sand and a nominal amount of PVA fibers 一种经济工程胶凝复合材料(ECC)，由细采石场砂和标称量的聚乙烯醇纤维制备

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.5

F. Khan, S. W. Khan, Imad Said, S. Hussain

引用次数: 2

Preliminary calciner 初步煅烧窑

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.6.2

W. Kurdowski

{"title":"Preliminary calciner","authors":"W. Kurdowski","doi":"10.32047/cwb.2021.26.6.2","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.6.2","url":null,"abstract":"In the former years, the total amount of heat indispensable for clinker formation was obtained in the kiln burner, which determined the maximum of this heat, thus the kiln efficiency was simultaneously determined. The kiln has the double role: the hearth and the chemical reactor. The diminishing of the heat loading of the kiln can be obtained only by emitting the calcination heat of raw materials from the kiln. At the same time, it gives the possibility of significant increase of the kiln productivity, which was already no longer limited by the heat quantity, linked to the kiln burner. In this technology, the kiln burner was only applied to heat the material in the kiln from the temperature of 1100°C to 1450°C, which was fulfil about 15% of the heat, from the entire heat demand of clinker burning. It will be 3050 x 0.15 equal to about 480 kJ/kg of clinker. As is known in the clinker formation process, radical changes of the properties of the roasting material occur, which are started at the temperature of 1260°C and are linked with the liquid phase appearing. After the liquid phase appears, the process cannot be conducted in the fluid reactor, because the material can form the roasting formation on the reactor walls, which can cause its plugging. From these reasons, the best technological solution was the division of the process into two operations, applied in two different equipments: (a) heating and calcining conducting in the fluid heater, which was the preliminary calciner, and (b) sintering and clinker formation in the rotary kiln. This technological division caused the high kiln capacity, because the quantity of heat needed in the kiln was low and the heat charge of the zone of fuel burning in the kiln burner was also low","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"7 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74490091","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

Properties of the bearing construction materials used in a historical masonry structure of Haci Hasan Feyzi mosque 哈齐哈桑费兹清真寺历史砖石结构承重建筑材料的性能

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.6.6

Adem Solak

引用次数: 0

Retraction Notice to: Effect of TiO2 nanoparticles on the properties of self compacting concrete 撤回:TiO2纳米颗粒对自密实混凝土性能的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.1

A. Nazari, Shadi Riahi

引用次数: 0