Journal of Building Materials and Structures最新文献_第7页

Comparative study and optimization of the mechanical behavior of sandwich beams loaded in three point bending 夹层梁三点弯曲受力性能的比较研究与优化

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1285956

F. Bourouis, F. Mili

{"title":"Comparative study and optimization of the mechanical behavior of sandwich beams loaded in three point bending","authors":"F. Bourouis, F. Mili","doi":"10.5281/ZENODO.1285956","DOIUrl":"https://doi.org/10.5281/ZENODO.1285956","url":null,"abstract":"The sandwich material presents a certain interest in term of rigidity and specific resistance for the aeronautic structure design. The study of this material meets always the choice problem of their constituents (coating and core) in order to find the optimal mechanical characteristic. The aim of this work is to do a comparative study of the mechanical behavior of the sandwich beams loaded in three point bending. The structures considered consist of two skins of composite material with unidirectional fibers of six plies Glass/epoxy, Carbon/epoxy or Kevlar/epoxy of stacking sequence [0°/90°]3s and [45°/-45°]3s and the core is in Alporas , Corecel, PVC, or Polyurethane foams. The different results obtained from the Matlab code showed that the correct choice of the material of the coatings and of the core that improves the mechanical behavior of the sandwich beam. In order to increase the performance of sandwich beams, in three points bending, an optimization program based on the principles of genetic algorithms has been developed to maximize the tensile strength of face yielding and face wrinkling failure modes. The equations used to evaluate the individuals in population results from the classical laminate theory with transverse shear stresses and discrete variables. Operators of genetic algorithms (selection, crossover and mutation) are applied to the children of a hundred generations. To achieve optimal solutions, the result appeared effective despite all the non-deterministic nature of genetic algorithms. But, to achieve maximum effectiveness, it’s important to choose smartly the parameters of genetic algorithms depending on the nature of the problem studied and the mechanical characteristics of the function to be optimized.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41643731","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: 1

Experimental case study on the effect of the urban morphology on urban microclimate and outdoor thermal comfort 城市形态对城市小气候和室外热舒适性影响的实验案例研究

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/zenodo.1299262

S. Sedira, S. Mazouz

引用次数: 5

Mechanical behavior and durability of latex modified mortars 乳胶改性砂浆的力学性能和耐久性

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1297668

Y. Benali, F. Ghomari

{"title":"Mechanical behavior and durability of latex modified mortars","authors":"Y. Benali, F. Ghomari","doi":"10.5281/ZENODO.1297668","DOIUrl":"https://doi.org/10.5281/ZENODO.1297668","url":null,"abstract":"This article summarizes the results of an experimental program developed on latex-modified mortars. Fluidity tests, compressive strength tests, flexural strength tests, water absorption tests, adhesion tests on clay bricks and cementitious substrates were carried out. The test bodies were prepared by the pre-wetting method with different latex contents while partially substituting Portland cement by two types of latex: Styrene-Butadiene (SBR) and Styrene Acrylic (SA). In addition, samples of ordinary mortars are made in parallel as references. \u0000The experimental results showed that the substitution of cement in mortars produced a notable improvement on fluidity and adhesion. In the case of clay substrates, a cohesive failure in the support above 10% substitution has been reported, whereas the rupture is always at the interface for all the mixtures tested on cementitious substrates. An improvement was also noted on the flexural tensile strength beyond 60 days. On the other hand, the compressive strength of the polymer mortars decreased with the substitution rate of cement for all the maturities studied. As for the absorption of water, the results show a clear reduction in the percentage of water absorption by increasing the substitution rate","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44623631","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: 2

Study of Architectural Ceramics of the Qal’a of Bani Hammad 巴尼·哈马德Qal 'a建筑陶瓷的研究

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.34118/jbms.v5i1.55

Abla Brahmi, M. Hamiane

{"title":"Study of Architectural Ceramics of the Qal’a of Bani Hammad","authors":"Abla Brahmi, M. Hamiane","doi":"10.34118/jbms.v5i1.55","DOIUrl":"https://doi.org/10.34118/jbms.v5i1.55","url":null,"abstract":"In order to define with precision, the physicochemical characteristics of the architectural ceramic exhumed from the Qal’a of Bani Hammad’s site (inscribed on the UNESCO’s World Heritage List in 1980), our study was conducted on a set of ceramics. The first analyses were focused on the color of the glazes, by optical absorption spectrophotometry (also called optical absorbance spectroscopy), on the texture by X-Ray diffraction, and on the elemental composition of the various constituent stages of these glazes and their terra cotta, by scanning electron microscopy and X-Ray fluorescence. Indeed, the study combining optical absorbance spectroscopy and X-Ray fluorescence enabled us to determine the origin of the monochromic green coloring of the glazes in some samples. This coloring can be attributed to the presence of the Cu2 chemical element; but these glazes darkened due to the high iron content they contain. This could be explained by an intentional addition of iron, in tin-opacified leaded glazes, baked in an oxidizing atmosphere and put on a limestone-rich marlacious paste. \u0000The chemical and mineralogical analyses of all shards show that their paste is calcareous. This dataset will be exploitable for re-creation experiments. It also represents a first exploitable referential system, for potential comparisons with other samples belonging to other Algerian sites and different periods of time.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46832551","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

Experimentation of a novel composite phase change material for thermal comfort improvement and energy saving in buildings 一种新型复合相变材料在改善建筑热舒适和节能方面的试验研究

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1291330

Lisa Boussaba, S. Makhlouf, A. Foufa

{"title":"Experimentation of a novel composite phase change material for thermal comfort improvement and energy saving in buildings","authors":"Lisa Boussaba, S. Makhlouf, A. Foufa","doi":"10.5281/ZENODO.1291330","DOIUrl":"https://doi.org/10.5281/ZENODO.1291330","url":null,"abstract":"This study focuses on the preparation of a novel composite phase change material (PCM) for an application of Latent Heat Thermal Energy Storage in buildings. The aim of this application is to improve thermal inertia in buildings. A good thermal inertia, involves the improvement of thermal comfort and energy saving. The experimented materials’ components are selected for their availability, safety and low cost. Paraffin with a melting temperature range close to 30°C is selected as a PCM; it is composed of microcrystalline wax and liquid paraffin. The matrix is prepared from plaster, graphite powder and cellulose fibers. The PCM is introduced in the matrix following the immersion method. Several samples are prepared; there after they are subjected to a thermal treatment at 50°C for 30 min on a filter paper. The purpose is to identify the performance of each sample to retain the PCM without leakages. \u0000Thermal and physicochemical characterizations are performed to study the composites’ properties: Scanning Electron Microscopy (SEM) is used to observe its microstructure; X-Ray Diffraction (XRD) identifies the crystallographic structure of the composite-PCM while Fourier Transformed Infrared Spectroscopy (FT-IR) reveals the chemical compatibility between its different components. Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) are performed for thermal characterization. The thermal performance of the composite-PCM is verified experimentally using thermocouple measurements connected to a temperature recorder apparatus. The measurements are done simultaneously on two pellets; the first contains PCM while the second does not contain PCM.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47017239","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

Structural Characteristics of Composite Mortars and their Evolution with PET Substitution Level for Several Specimens’ Ages 复合材料砂浆的结构特征及其随PET取代水平的演化

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1299346

N. K. Tani, A. Benosman, Y. Senhadji, H. Taïbi, M. Mouli

{"title":"Structural Characteristics of Composite Mortars and their Evolution with PET Substitution Level for Several Specimens’ Ages","authors":"N. K. Tani, A. Benosman, Y. Senhadji, H. Taïbi, M. Mouli","doi":"10.5281/ZENODO.1299346","DOIUrl":"https://doi.org/10.5281/ZENODO.1299346","url":null,"abstract":"This present study aims to investigate the evolution of structural response of PET-Mortar composite test with a short-beam specimen in three-point bending tests, with composite mortar ages and volumetric polymer rate and this, based on compression strength tests. The ultimate PET-mortar composite structural responses are calculated at the mid span of the short-beam by the mean of mechanics-of-materials theory basis. According to this theory, the distribution of bending moments and shear forces at any point of the composite short-beam specimen doesn’t depend on material mechanical properties especially the young modulus of modified mortar composite; so, the structural response analysis has been limited to investigate the evolution of ultimate deflection with several volumetric PET rates and composite mortar ages. In the other hand, we present a comparative study between experimental test results of splitting tensile and compressive strengths with the ones predicted by codale previsions (ACI-363 and B.S) codes in terms of PET mortar ages and volumetric PET rates in order to recommend the most suitable design code for PET-mortar composite applications in construction industries.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44022911","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 crushing of grains of limestone under the effect of cyclic loading with the fractal dimension 循环载荷作用下石灰石颗粒破碎的分形研究

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/zenodo.1297909

A. Bouzeboudja, B. Melbouci, O. Bouzeboudja

{"title":"Study of crushing of grains of limestone under the effect of cyclic loading with the fractal dimension","authors":"A. Bouzeboudja, B. Melbouci, O. Bouzeboudja","doi":"10.5281/zenodo.1297909","DOIUrl":"https://doi.org/10.5281/zenodo.1297909","url":null,"abstract":"The grains can be of very diverse nature (size, shape, mineralogy, etc), indeed even if each grain is a fairly simple object, the set of grains is a very complex system in which the geometrical and physical properties of the grains, their forces and their orientations play a crucial role in their mechanical behavior. The measurement of their shape in soil mechanics has historically required the use of standards and diagrams to which the different grains can be compared. However, these methods are approaches and remain insufficient and incomplete for the actual measurement of their form and the understanding of their behavior remains a task far from being completed. \u0000This work is in this context and proposes to analyze the shape and size of the grains with the fractal theory using the Box Counting method. It also makes it possible to study their influence on the crushing of the grains of the calcareous material under the effect of the cyclic loading-unloading during the oedometer test. The obtained results show that the variation of the fractal dimension, corresponding to the crushing effect of the grains, is strongly influenced by their shape, their size, their particle size distribution and the variation in the number of loading-unloading cycles.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47186613","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

Influence of some industrial wastes as a heavy aggregate on durability of concrete upon utilization in the special constructions 一些工业废料作为重骨料在特殊建筑中使用对混凝土耐久性的影响

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1254620

M. Gharieb, H. El-Sayed, S. Abo-El-Enein, K. Sakr, A. Ali, T. El-Sokkary

{"title":"Influence of some industrial wastes as a heavy aggregate on durability of concrete upon utilization in the special constructions","authors":"M. Gharieb, H. El-Sayed, S. Abo-El-Enein, K. Sakr, A. Ali, T. El-Sokkary","doi":"10.5281/ZENODO.1254620","DOIUrl":"https://doi.org/10.5281/ZENODO.1254620","url":null,"abstract":"The aim of this study is to investigate the effect of some industrial wastes as a heavy aggregate on durability of the concrete after exposure to different effects. The coarse aggregates used to perform the concrete were dolomite (control) and lead slag, while fine aggregate were sand and lead slag aggregate. The physical and mechanical properties of use draw aggregates were determined also the physical and mechanical properties of different types of concrete were studied. The linear attenuation coefficients (μ) and half value layer (HVL) of gamma rays measurements have been carried out using γ-rays sources of Cs173 and Co60. Effect of sea water on the mechanical properties of high performance concrete; in addition, corrosion behavior of reinforcing steel embedded in concrete incorporating different aggregates upon exposure to sea water were studied. It was found that, the compressive strength for all concrete mixes made with dolomite and lead slag coarse aggregates satisfy the requirements of compressive strength for high performance concrete (grade-M60) after 28 days of curing in tap water. The results indicate that, the compressive strength values and gamma radiation shielding properties of concrete mix containing lead slag aggregate enhances upon replacing sand by fine portion of lead slag aggregate. The concrete mixes made with lead slag coarse aggregate proved their high endurance and could sustain sea water exposure, achieving compressive strength values exceeding grade M-60 concrete even after 6 months exposure. Lead slag concrete- in spite of its efficient durability-requires the incorporation of a corrosion inhibitor to counteract the hostile effect of the high sulfate concrete in the aggregate.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49609662","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: 2

Impact of passive cooling techniques on the thermal behavior of residential buildings in hot and arid regions -An experimental study- 被动冷却技术对炎热干旱地区住宅建筑热性能影响的实验研究

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/zenodo.1296110

W. Athmani, L. Sriti

{"title":"Impact of passive cooling techniques on the thermal behavior of residential buildings in hot and arid regions -An experimental study-","authors":"W. Athmani, L. Sriti","doi":"10.5281/zenodo.1296110","DOIUrl":"https://doi.org/10.5281/zenodo.1296110","url":null,"abstract":"The thermal performance of the roof is one of the most important factors for a comfortable environment. As 50% of the thermal loads received by a building come from the roof, this research seeks to find the roofing system that opposes the transmission of heat during the hottest days and promotes indoor thermal comfort. In this regard, this paper presents an experimental study carried out on four (04) testing cells constructed on a reduced scale and submitted to climatic external conditions. Three (03) cells were used to test passive cooling strategies through the roof, namely: the cool roof, ventilated roof and a roof with inverted earth pots. The fourth cell that served as cell-reference, for its part, a conventional roof. The experimentation concerned the types of roofs most used in residential buildings in Biskra, Algeria. The measurements process was effectuated in an exposed field during the month of July, prevailing the metrological data of the hot and arid climate. The obtained results show that the use of the cool-roof technique makes it possible to record the lowest internal temperatures in comparison with the other systems. Thus, the reflective coating technique is capable of reducing the internal temperature from 3.33 °C to 4.80 °C, also the internal and external surface temperature of the roofs from 5.31 °C to 10.18 °C, respectively. These experimental results confirm the effectiveness of the \"cool roof\" technique as an innovative and efficient solution that contributes to the achievement of the comfort conditions in a hot and arid climate by eliminating heat gains through the roof.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47885666","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: 1

Effects of adding sisal and glass fibers on the mechanical behaviour of concrete polymer 添加剑麻和玻璃纤维对混凝土聚合物力学性能的影响

Journal of Building Materials and Structures Pub Date : 2018-06-04 DOI: 10.5281/ZENODO.1296700

N. Benzannache, A. Bezazi, H. Bouchelaghem, M. Boumaaza, F. Scarpa, S. Amziane

{"title":"Effects of adding sisal and glass fibers on the mechanical behaviour of concrete polymer","authors":"N. Benzannache, A. Bezazi, H. Bouchelaghem, M. Boumaaza, F. Scarpa, S. Amziane","doi":"10.5281/ZENODO.1296700","DOIUrl":"https://doi.org/10.5281/ZENODO.1296700","url":null,"abstract":"In this study, we investigated the influence of the addition of sisal and glass fibres on the mechanical properties of polymer concrete (PC). These types of concrete are used in many modern civil engineering applications. The prismatic specimens sized according to ASTM C580-02 were elaborated with a PC constituted by 14% constant mass of polyester resin matrix, a granular skeleton based on sand and powder marble. The reinforcement with 60% sand and 26% marble powder adopted in this investigation is the best formulation found in previous authors work. This composition was reinforced by 1 and 2% of sisal and glass fibres, the first one having lengths of 6 mm or 12 mm, however, the second unidirectional cut into bands. These specimens were subjected to 3-point bending monotonic loading. The results obtained were discussed and compared with those obtained for control beams without fibres reinforcement. It is important to note that the incorporation of the glass fibre contributes to an increase of the ultimate load of the polymer composite material produced, however, the addition of the sisal fibre lead to its decreases. In addition, the incorporation of 2% of sisal fibre having 6 mm length leads to a reduction of 26% of the mass of the specimens.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46590373","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: 1