Journal: Materials最新文献_第6页

Sodium Sulphate Effect on Cement Produced with Building Stone Waste 硫酸钠对建筑石材废料生产水泥的影响

Journal: Materials Pub Date : 2015-05-07 DOI: 10.1155/2015/813515

E. Sancak, Ş. Özkan

引用次数: 20

Effect of Inert and Pozzolanic Materials on Flow and Mechanical Properties of Self-Compacting Concrete 惰性材料和火山灰材料对自密实混凝土流动和力学性能的影响

Journal: Materials Pub Date : 2015-03-31 DOI: 10.1155/2015/239717

Mehrdad Mahoutian, M. Shekarchi

{"title":"Effect of Inert and Pozzolanic Materials on Flow and Mechanical Properties of Self-Compacting Concrete","authors":"Mehrdad Mahoutian, M. Shekarchi","doi":"10.1155/2015/239717","DOIUrl":"https://doi.org/10.1155/2015/239717","url":null,"abstract":"This research investigates the fresh behaviour and mechanical properties of self-compacting concrete (SCC) containing high volume of limestone, metakaolin, silica fume, zeolite, and viscosity modifying admixture. Two fine aggregates with different fineness modulus were also utilized to evaluate the effect of sand’s gradation on the mechanical and flow properties of SCC containing inert and pozzolanic powder. Slump flow, V-funnel for fresh concrete and 5-minute-old concrete, J-ring, Orimet with and without J-ring, and L-box and U-box tests were performed on all 14 fresh concrete mixtures to examine the fresh properties of self-compacting concrete. Compressive strength of hardened specimens was measured at 7 and 35 days and tensile strength was also determined at the age of 28 days. The results show that sand grading significantly affects the fresh properties of SCC. It is also concluded that high volume of active powders including metakaolin, zeolite, and silica fume could not improve both the flow and mechanical properties of SCC at the same time. Limestone can be effectively used as filler in SCC in high volume content. A new set of limits for the L-box and U-box tests for SCC containing silica fume is also recommended as the existing criteria are not satisfactory.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"71 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2015-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75741208","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: 12

A Qualitative Study of Thermochemical Degradation Related with Concrete and Mortar Strength 混凝土和砂浆强度相关热化学降解的定性研究

Journal: Materials Pub Date : 2015-03-26 DOI: 10.1155/2015/502405

José Mora-Ruacho, H. A. Monreal-Romero

{"title":"A Qualitative Study of Thermochemical Degradation Related with Concrete and Mortar Strength","authors":"José Mora-Ruacho, H. A. Monreal-Romero","doi":"10.1155/2015/502405","DOIUrl":"https://doi.org/10.1155/2015/502405","url":null,"abstract":"The nondestructive methods applied to the evaluation of concrete use different parameters to be related in the estimated resistance of concrete or other properties. The conducted study has evaluated a qualitative method of thermochemical degradation in concrete and mortar using a solvent acid whose chemical energy is capable of degrading the material. The reported study consisted in performing laboratory tests on mechanical compressive strength of concrete and mortar and thermochemical tests performed on little cores of concrete or mortar immersed in hydrochloric acid contained in a calorimeter system, obtaining several parameters as the time of thermal equilibrium, increase of temperature, degradation energy, and mass loss due to the thermochemical reaction. From the obtained results, these variables were analyzed and served as a parameter to be related with the concrete or mortar strength. The best parameter proved to be a good estimator was the increase of temperature and its degradation energy, whose value was inversely proportional to the strength of the material. Also, it is found that the most significant mechanisms that influenced the thermochemical reaction are the calcium content and the water chemically bound in the cement paste to perform the thermochemical test.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"22 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76151022","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

A Reconciliation of Packed Column Permeability Data: Deconvoluting the Ergun Papers 填料柱渗透率数据的调和:对Ergun论文的反卷积

Journal: Materials Pub Date : 2014-09-22 DOI: 10.1155/2014/548482

H. Quinn

引用次数: 12

From Garbage to Biomaterials: An Overview on Egg Shell Based Hydroxyapatite 从垃圾到生物材料:蛋壳基羟基磷灰石综述

Journal: Materials Pub Date : 2014-08-25 DOI: 10.1155/2014/802467

Idris Abdulrahman, H. Tijani, Bashir Mohammed, H. Saidu, Hindatu Yusuf, Mohammed Ndejiko Jibrin, Sulaiman Mohammed

{"title":"From Garbage to Biomaterials: An Overview on Egg Shell Based Hydroxyapatite","authors":"Idris Abdulrahman, H. Tijani, Bashir Mohammed, H. Saidu, Hindatu Yusuf, Mohammed Ndejiko Jibrin, Sulaiman Mohammed","doi":"10.1155/2014/802467","DOIUrl":"https://doi.org/10.1155/2014/802467","url":null,"abstract":"The conversion of waste obtained from agricultural processes into biocompatible materials (biomaterials) used in medical surgery is a strategy that will add more value in waste utilization. This strategy has successfully turned the rather untransformed wastes into high value products. Eggshell is an agricultural waste largely considered as useless and is discarded mostly because it contributes to pollution. This waste has potential for producing hydroxyapatite, a major component found in bone and teeth. Hydroxyapatite is an excellent material used in bone repair and tissue regeneration. The use of eggshell to generate hydroxyapatite will reduce the pollution effect of the waste and the subsequent conversion of the waste into a highly valuable product. In this paper, we reviewed the utilization of this agricultural waste (eggshell) in producing hydroxyapatite. The process of transforming eggshell into hydroxyapatite and nanohydroxyapatite is an environmentally friendly process. Eggshell based hydroxyapatite and nanohydroxyapatite stand as good chance of reducing the cost of treatment in bone repair or replacement with little impact on the environment.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"107 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89696738","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: 119

Effect of Short Fiber Reinforcement on Mechanical Properties of Hybrid Phenolic Composites 短纤维增强对杂化酚醛复合材料力学性能的影响

Journal: Materials Pub Date : 2014-08-06 DOI: 10.1155/2014/478549

S. Manoharan, B. Suresha, G. Ramadoss, B. Bharath

{"title":"Effect of Short Fiber Reinforcement on Mechanical Properties of Hybrid Phenolic Composites","authors":"S. Manoharan, B. Suresha, G. Ramadoss, B. Bharath","doi":"10.1155/2014/478549","DOIUrl":"https://doi.org/10.1155/2014/478549","url":null,"abstract":"Fiber plays an important role in determining the hardness, strength, and dynamic mechanical properties of composite material. In the present work, enhancement of viscoelastic behaviour of hybrid phenolic composites has been synergistically investigated. Five different phenolic composites, namely, C1, C2, C3, C4, and C5, were fabricated by varying the weight percentage of basalt and aramid fiber, namely, 25, 20, 15, 10, and 5% by compensating with barium sulphate (BaSO4) to keep the combined reinforcement concentration at 25 wt%. Hardness was measured to examine the resistance of composites to indentation. The hardness of phenolic composites increased from 72.2 to 85.2 with increase in basalt fiber loading. Composite C1 (25 wt% fiber) is 1.2 times harder than composite C5. Compression test was conducted to find out compressive strength of phenolic composites and compressive strength increased with increase in fiber content. Dynamic mechanical analysis (DMA) was carried out to assess the temperature dependence mechanical properties in terms of storage modulus ( ), loss modulus ( ), and damping factor (tan δ). The results indicate great improvement of values and decrease in damping behaviour of composite upon fiber addition. Further X-ray powder diffraction (XRD) and energy-dispersive X-ray (EDX) analysis were employed to characterize the friction composites.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"10 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90116567","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: 26

Effect of Carbon Nanotube Size on Compressive Strengths of Nanotube Reinforced Cementitious Composites 碳纳米管尺寸对碳纳米管增强胶凝复合材料抗压强度的影响

Journal: Materials Pub Date : 2014-07-17 DOI: 10.1155/2014/960984

T. Manzur, N. Yazdani, Md Abul Bashar Emon

{"title":"Effect of Carbon Nanotube Size on Compressive Strengths of Nanotube Reinforced Cementitious Composites","authors":"T. Manzur, N. Yazdani, Md Abul Bashar Emon","doi":"10.1155/2014/960984","DOIUrl":"https://doi.org/10.1155/2014/960984","url":null,"abstract":"Application of nanoscale science to construction material has already begun. In recent times, various nanofibers have raised the interest of researchers due to their exceptional mechanical properties and high potential to be used as reinforcement within cement matrix. Carbon nanotube (CNT) is one of the most important areas of research in the field of nanotechnology. The size and exceptional mechanical properties of CNT show their high potential to be used to produce high performance next generation cementitious composites. In this study, an attempt has been made to investigate the effect of size of CNTs on compressive strengths of CNT reinforced cement composites. Seven different sizes of multiwalled nanotubes (MWNTs) were used to produce MWNT-cement composites. A trend was observed regarding the effect of nanotube size on compressive strength of composites in most cases. MWNT with outside diameter (OD) of 20 nm or less exhibited relatively better performance. Smaller MWNT can be distributed at much finer scale and consequently filling the nanopore space within the cement matrix more efficiently. This in turn resulted in stronger composites.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"77 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79845277","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: 58

Experimental Investigation of the Phase Equilibria in the Al-Mn-Zn System at 400°C Al-Mn-Zn体系400℃相平衡的实验研究

Journal: Materials Pub Date : 2014-07-17 DOI: 10.1155/2014/451587

Tian-xu Wang, D. Kevorkov, Ahmad Mostafa, M. Medraj

引用次数: 6

Structural Investigation of Photocatalyst Solid Ag1−xCuxInS2 Quaternary Alloys Sprayed Thin Films Optimized within the Lattice Compatibility Theory (LCT) Scope 在晶格相容理论(LCT)范围内优化的固体Ag1−xCuxInS2季系合金喷射光催化剂薄膜的结构研究

Journal: Materials Pub Date : 2014-07-14 DOI: 10.1155/2014/325271

A. Colantoni, L. Longo, K. Boubaker

引用次数: 5

Synthesis, Growth, and Characterization of Bisglycine Hydrobromide Single Crystal 双甘氨酸氢溴化物单晶的合成、生长和表征

Journal: Materials Pub Date : 2014-06-29 DOI: 10.1155/2014/362678

K. Pandurangan, S. Suresh

{"title":"Synthesis, Growth, and Characterization of Bisglycine Hydrobromide Single Crystal","authors":"K. Pandurangan, S. Suresh","doi":"10.1155/2014/362678","DOIUrl":"https://doi.org/10.1155/2014/362678","url":null,"abstract":"Single crystals of BGHB were grown by slow evaporation technique. The unit cell dimensions and space group of the grown crystals were confirmed by single crystal X-ray diffraction. The modes of vibration of the molecules and the presence of functional groups were identified using FTIR technique. The microhardness study shows that the Vickers hardness number of the crystal increases with the increase in applied load. The optical properties of the crystals were determined using UV-Visible spectroscopy. The thermal properties of the grown crystal were also determined. The refractive index was determined as 1.396 using Brewster’s angle method. The emission of green light on passing the Nd: YAG laser light confirmed the second harmonic generation property of the crystals and the SHG efficiency of the crystals was found to be higher than that of KDP. The dielectric constant and dielectric loss measurements were carried out for different temperatures and frequencies. The ac conductivity study of the crystals was also discussed. The photoconductivity studies confirm that the grown crystal has negative photoconductivity nature. The etching studies were carried out to study the formation of etch pits.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"18 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83921787","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: 14