Journal of Building Materials and Structures最新文献_第2页

Production of Green Cement from Slag Enhanced by Egyptian Metakaolin Materials 埃及偏高岭土增强矿渣生产绿色水泥

Journal of Building Materials and Structures Pub Date : 2020-10-31 DOI: 10.34118/jbms.v7i2.770

Abdeen M. El Nagar

{"title":"Production of Green Cement from Slag Enhanced by Egyptian Metakaolin Materials","authors":"Abdeen M. El Nagar","doi":"10.34118/jbms.v7i2.770","DOIUrl":"https://doi.org/10.34118/jbms.v7i2.770","url":null,"abstract":"New geopolymer-based materials offer excellent perspectives for the future; they should not be regarded as competitive materials for Portland cement, which has been the reference construction material for so long, but as alternative materials with a series of important advantages to be considered. Metakaolin (MK) produced from firing kaolin material up to 750 ºC for 2 h with a heating rate of 5ºC/min; leads to an enhancement in mechanical and microstructural properties of alkali activated geopolymer of water cooled slag material using (6:6, wt%) of sodium hydroxide and sodium silicate. In the present work the ratios of MK which will be added are less than 20% of the total mass, because of the used MK was very fine with average pore structure less than 30 mµ, which hinders the geopolymerization reaction if used as high ratio. Curing was performed under 100% relative humidity at a temperature of 38ºC and ages of 7, 14, 28 & 90 days. The properties of geopolymer specimens have been studied through measurement of XRD, SEM imaging, FTIR, compressive strength and water absorption. Results showed that the mixes of metakaolin up to 15% results in an enhancement in the mechanical properties as compared with slag control mix up to 90 days.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48367755","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

Behavior of self- compacting concrete incorporating calcined pyrophyllite as supplementary cementitious material 煅烧叶蜡石作为辅助胶凝材料的自密实混凝土性能

Journal of Building Materials and Structures Pub Date : 2020-10-19 DOI: 10.5281/ZENODO.4005645

S. Mansour

{"title":"Behavior of self- compacting concrete incorporating calcined pyrophyllite as supplementary cementitious material","authors":"S. Mansour","doi":"10.5281/ZENODO.4005645","DOIUrl":"https://doi.org/10.5281/ZENODO.4005645","url":null,"abstract":"The current trend of industrial concrete leans more towards the use of self-compacting concrete. These must have fresh properties well defined as fluidity, filling ability and resistance to segregation. However, to ensure the rheological stability, use mineral fines is required. In this work, powder of calcined pyrophyllite (CP) was used as cement substitution at level of 10% and 20% by weight. The interest is focused on the role played by the calcined pyrophyllite to produce SCC with reduced impact environmental.. Calcination of pyrophyllite powder was carried out at 750 °C. Its effect on the workability and mechanical properties of self-compacting concrete is analyzed. The results show that the properties of workability of SCC containing 10% of calcined pyrophyllite tested at fresh state (Slump Flow, T50, passing ability and segregation resistance) are almost identical to those of the control SCC. Furthermore, the calcined pyrophyllite increases the compressive strength, tensile and flexural strength of SCC approaching without exceeding those of the control SCC. It seems that 10 % of calcined pyrophyllite is the optimum replacement rate which improves mechanical strength compared to 20%. Replacing cement with the calcined pyrophyllite aims to save cement and reduce the CO2 emissions released during the manufacture of cement.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48611911","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

Experimental characterisation and numerical modelling of the resilient behaviour of unbound granular materials for roads 道路用松散颗粒材料弹性特性的实验表征和数值模拟

Journal of Building Materials and Structures Pub Date : 2020-09-27 DOI: 10.5281/ZENODO.4052674

K. Sandjak, M. Ouanani, B. Tiliouine

引用次数: 1

Analysis of Aqueducts Subjected to Hydrostatic and Dynamic Loads Using 3D - Solid Modeling 基于三维实体模型的渡槽静、动荷载分析

Journal of Building Materials and Structures Pub Date : 2020-09-09 DOI: 10.5281/ZENODO.4020179

J. Yadav, S. S. Babu

引用次数: 0

Conception of eco-friendly cement based on natural pozzolan to improve rheological behavior of concrete 基于天然火山灰的环保水泥的概念，以改善混凝土的流变性能

Journal of Building Materials and Structures Pub Date : 2020-09-01 DOI: 10.5281/ZENODO.4009773

S. Mansour, Y. Ghernouti

{"title":"Conception of eco-friendly cement based on natural pozzolan to improve rheological behavior of concrete","authors":"S. Mansour, Y. Ghernouti","doi":"10.5281/ZENODO.4009773","DOIUrl":"https://doi.org/10.5281/ZENODO.4009773","url":null,"abstract":"The pozzolan of Beni- Saf region (North-West Algeria) is a natural material of volcanic origin with an ability to react with lime in the presence of water and to form compounds with binding properties. Therefore, its use in the production of new cementitious materials will protect the environment. It will therefore be interesting to exploit this source as a partial cement substitution. In this work, a rheometric investigation was carried out to assess the performance of the natural pozzolan substituted to cement at variable rates ranging from 5%, 10%, 15% to 20% in order to obtain an ecological concrete. As the rheological behavior of concrete depends on the behavior of the cement paste, the effect of pozzolan on the latter was analyzed using static flow tests and dynamic creep and oscillation tests. The results of the rheometric tests have shown that in flow, the pozzolan improves the fluidity and in oscillation mode, it generates a viscous behavior of the cementitious pastes compared to elastic behavior of the control paste. Furthermore, the transient study (creep / recovery) made it possible to highlight the liquid viscoelastic character of the cement pastes. With 10% of pozzolan, the rheological behavior of the paste is viscous liquid which seems to be the best. The use of pozzolan as cement substitution has significant economic, environmental and technical advantages, namely the development of natural pozzolan, reduction of CO2 emissions during the manufacture of cement as well as energy reduction and finally improvement of the properties of fresh concrete.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41450773","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

Properties of Sandcrete Block Produced with Coconut Husk as Partial Replacement of Sand 椰壳部分替代砂制砂混凝土砌块性能研究

Journal of Building Materials and Structures Pub Date : 2020-08-20 DOI: 10.5281/ZENODO.3993274

U. Robert, S. Etuk, O. Agbasi, S. Ekong

{"title":"Properties of Sandcrete Block Produced with Coconut Husk as Partial Replacement of Sand","authors":"U. Robert, S. Etuk, O. Agbasi, S. Ekong","doi":"10.5281/ZENODO.3993274","DOIUrl":"https://doi.org/10.5281/ZENODO.3993274","url":null,"abstract":"Sandcrete block is the most popular building material in construction industry. However, with the high and increasing cost of building materials experienced nowadays, it has been difficult to achieve affordable housing especially in developing countries. Also, significant dredging of sand for block production and the large amount of coconut husk thrown away as waste have increased the level of concern due to their adverse effect on environment. This work, therefore, sought to produce solid core sandcrete blocks in which sand component is partially replaced with coconut husk and investigate the suitability of using such blocks for building designs. The block samples produced using untreated and also treated coconut husks at various levels of sand replacement were subjected to bulk density, water absorption and compressive strength tests at 7 days and 28 days of curing. It was found that sand replacement with 20% of untreated coconut husk or 30% of treated coconut husk could yield a solid core sandcrete block suitable for non-load bearing walls of satisfactory performance. Since coconut husk is cheaply available, sustainable, and recyclable, utilising such promising material in this case can enhance production of cost-effective and optimally performing sandcrete blocks for building purposes. This will in turn help to boost the development of housing, minimise loss of agricultural lands, and reduce environmental pollution level, and so on.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43636665","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: 4

Effect of cement types on carbonation depth of concrete 水泥种类对混凝土碳化深度的影响

Journal of Building Materials and Structures Pub Date : 2020-08-01 DOI: 10.34118/jbms.v7i1.706

A. Merah, Youcef Korichi, Mohamed Mouldi Khenfer

{"title":"Effect of cement types on carbonation depth of concrete","authors":"A. Merah, Youcef Korichi, Mohamed Mouldi Khenfer","doi":"10.34118/jbms.v7i1.706","DOIUrl":"https://doi.org/10.34118/jbms.v7i1.706","url":null,"abstract":"Reinforced concrete as a building material is the most used in most civil engineering structures. This one is exposed to several attacks (physical, chemical and mechanical). Among these attacks, we can cite the phenomenon of carbonation, which leads to corrosion of the reinforcements and consequently reduces the service life of reinforced concrete structures. In addition, this phenomenon generates additional repair costs, which can sometimes exceed the initial cost of the building. Furthermore, it depends on the type and class of cement, two main classes of cement are used for the formulation of concrete in Algeria, ordinary Portland cements and cements with additions. \u0000 This paper enters in the option of sustainable development, in order to study the behavior of these two types of cements against accelerated carbonation. \u0000For this purpose, two concrete compositions (based on ordinary Portland cements and cements with additions) were formulated, from these two formulations, samples were made in order to subject them to accelerated carbonation in a chamber rich in CO2 according to the recommendations of the AFPC-AFREM. \u0000The results obtained clearly show that concretes based on ordinary Portland cements (OPC) are less sensitive to the phenomenon of carbonation compared to concretes based on blended cements. \u0000 ","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46919400","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

Study of the mechanical behavior of a lightweight wood concrete 轻质木混凝土的力学性能研究

Journal of Building Materials and Structures Pub Date : 2020-07-17 DOI: 10.5281/ZENODO.3946859

M. Bouabdallah

{"title":"Study of the mechanical behavior of a lightweight wood concrete","authors":"M. Bouabdallah","doi":"10.5281/ZENODO.3946859","DOIUrl":"https://doi.org/10.5281/ZENODO.3946859","url":null,"abstract":"Today, the development of building materials based on toxic or non-toxic industrial waste is a topical issue for the productive structures in industrialized countries. In this article, non-toxic wood waste (wood chips) is used to improve the characteristics of ordinary concrete (lightness, thermal insulation, acoustic absorption, rigidity under stresses, etc.) for the purpose of eventually developing light wood concrete. The present experimental study aims at conducting a comparative behavioral analysis between concretes based on non-toxic wood waste of natural origin on the one hand, and ordinary concrete on the other.In order to achieve this goal, a series of test pieces were made, with five different formulations. Four of them are lightweight wood-concretes obtained by the substitution of a volume of aggregates; the fifth formulation is ordinary concrete. A number of tests were carried out at the Construction Technical Control Laboratory at different ages, i.e. 7, 14, 21 and 28 days. Interesting results were obtained with respect to the evolution of the mechanical characteristics of light wood-concrete at early age. Some of these features, such as the long-term compressive strength of concrete, are essential parameters in civil engineering.","PeriodicalId":33130,"journal":{"name":"Journal of Building Materials and Structures","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48947841","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

Pathology Evaluation and Repair of Bridges in Masonry 砌体桥梁的病理学评价与修复

Journal of Building Materials and Structures Pub Date : 2020-04-19 DOI: 10.5281/ZENODO.3757082

S. Bekkouche, Ghania Boukhatem, D. Mendjel, S. Messast

引用次数: 0

Valorization of calcined kaolinitic clay used in high performance mortar 高性能砂浆中煅烧高岭石粘土的增值研究

Journal of Building Materials and Structures Pub Date : 2020-04-03 DOI: 10.5281/ZENODO.3735759

S. Mansour, Y. Ghernouti, R. Chaid

引用次数: 1