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State of the art review on physiochemical and engineering characteristics of fly ash and its applications

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International Journal of Coal Science & Technology 2022年第1期9卷 21-45页

作者： Amit Kumar Ram Supriya Mohanty Department of Civil Engineering Indian Institute of Technology(Banaras Hindu University)Varanasi 221005India

The focus of this study is to critically review the physiochemical and engineering properties of the fly ash and its applications in various *** utilization of fly ash has become a widespread area,but the amount of utilization is still a serious *** has many beneficial qualities(such as pozzolanic property,fineness,spherical shape,lightweight,etc.),which enhance its properties and make it suitable for its utilization as a new construction *** the bulk utilization of fly ash,it should be employed in the areas independent of any other *** that,the disposal problem can be reduced *** knowledge of its physiochemical characteristic helps in the judgment of appropriate fly ash for any particular type of *** ash can be utilized in other areas such as asphalt concrete,geopolymer concrete,ground improvement,agricultural sector,roller compacted concrete,brick,*** will reduce the existing ashes,and also the disposal problem can be solved *** implementation of fly ash must be avoided below the natural ground water level and below 4°C temperature conditions.

关键词： Fly ash Chemical property Engineering property construction material

Engineering and microstructure properties of contaminated marine sediments solidified by high content of incinerated sewage sludge ash

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 643-652页

作者： Jiang-Shan Li Yifan Zhou Xin Chen Qiming Wang Qiang Xue Daniel C.W.Tsang Chi Sun Poon State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science Hung HomKowloonHong KongChina Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan430071China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Management of incinerated sewage sludge ash(ISSA)and dredged contaminated marine sediments(CMSs)is a great challenge for Hong Kong and other coastal cities due to limited landfilling *** present study investigates the use of high content(20%of sediment by mass)of ISSA in combination with cement/lime for solidification/stabilization(S/S)treatment of CMSs to provide a way to reuse the wastes as construction *** results showed that ISSA being a porous material was able to absorb a large amount of water rendering a more efficient solidification process of the marine sediment which normally had a very high water content(w80%).The S/S treatment improved the engineering properties of the sediment,but reduced the workability,especially for the lime-treated *** can be used to replace ordinary Portland cement(OPC)for better heavy metal immobilization and carbon emission *** hardened sediment samples prepared with 10%of lime and 20%of ISSA could attain a strength of 1.6 MPa after 28 d of *** addition,leaching tests confirmed that there was no environmental risk induced by these stabilized *** formation of hydrated cementitious compounds including calcium silicate hydrate(CeSeH)/calcium aluminate silicate hydrate(C-A-S-H)/hydrocalumite/calcite was mainly responsible for the strength development in the ISSA/lime-treated sediments.

关键词： Contaminated marine sediment(CMS) Incinerated sewage sludge ash(ISSA) Solidification/stabilization(S/S) Heavy metals construction material

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

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Journal of Renewable materials 2019年第11期7卷 1147-1164页

作者： Jiawei Chen Haibei Xiong Zhifang Wang Linqing Yang College of Civil Engineering Tongji UniversityShanghai200092China Shenzhen Plantation material Technology Co. Ltd.Shenzhen518055China

Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental *** oblique strand lumber(Eucalyptus Strand Wood,ESWood),which is manufactured from fast-growing small diameter eucalyptus wood(Eucalyptus urophylla×***),is introduced in this *** clear specimen tests were conducted to determine the mechanical properties of ESWood material while full-scale component tests were performed to observe the structural performance of ESWood beams.A comparison of mechanical properties of ESWood with other wood/bamboo-based materials is then *** the results presented herein,it appears that the strength and stiffness properties of ESWood are affected by grain directionality and glued ***,it still has preferable mechanical properties as a building material,which is comparable or superior to those of other engineered wood/bamboo-based products(e.g.,Sitka spruce,LVL,OSL,Glulam,and Glubam).Furthermore,results from full-scale component tests show the stable mechanical performance of beams made by *** study makes a significant contribution to a potential utilization of fast-growing eucalyptus for general use in construction,and the presented mechanical tests results can serve as a fundamental data for more applications of ESWood in practical engineering.

关键词： Wood-based composite material mechanical properties eucalyptus experimental test construction material

River Sand Characterization for Its Use in Concrete: A Revue

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Open Journal of Civil Engineering 2023年第2期13卷 353-366页

作者： Muhindo Wa Muhindo Abdias Manjia Marcelline Blanche Ursula Joyce Pettang Nana Henry Fonbeyin Abanda Ngapgue François Pettang Chrispin Laboratory Engineering Civil and Mechanics Doctoral Research Unit for Engineering and Applications University of Yaoundé I Yaoundé Cameroon Buildings and Publics Works Section Institute of Building and Public Works Butembo Democratic Republic of Congo Department of Civil Engineering National Advanced School of Engineering University of Yaoundé 1 Yaoundé Cameroon Faculty of Technology Design and Environment Oxford Brookes University Oxford UK Department of Civil Engineering Fotso Victor University Institute of Technology University of Dschang Bandjoun Cameroon

Despite the gradual professionalization of the construction sector as well as the abundance of sand mining sites offered by the North Kivu, Democratic Republic of Congo Region, ignorance of materials by local builders persists. This is the case of quarries extracting river sand used to make concrete and mortar. However, the dosages of the various constituents are most often chosen on the basis of experience without any prior characterization of this material. This paper presents a comprehensive review of the characterization of river sand for its use in concrete in DRC. The origin and global use of river sand in construction are presented in percentage terms to highlight the importance of river sand as a construction material. The physical properties of river sand, including particle size distribution, bulk density, absolute density, and cleanliness are discussed in detail. The paper examines the effect of variations in river sand properties on concrete behavior, including density and compressive strength. Overall, this paper emphasizes the need to properly characterize river sand before using it in construction to ensure durable, high-quality structures. This will avoid the problems that are observed in particular a bad behavior of the coating on the walls;cracks and crumbling of the beams, lintels, posts and even the ruin of the structures.

关键词： Characterization River Sand Concrete construction material Structure

Mixed Stone-timber Masonry in Traditional construction: Structural, Architectural and Anti-seismic Features across Europe

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Journal of Architectural Research and Development 2018年第2期2卷 10-21页

作者： Tiziana Campisi Manfredi Saeli Liucija Berezanskyt? Department of Architecture(D’ARCH) Polytechnic SchoolUniversity of PalermoPalermoItaly Department of materials and Ceramics Engineering Aveiro Institute of MaterialsUniversity of AveiroAveiroPortugal Ph.D. professional engineerPalermoItaly

This paper investigates the stone masonry with timber reinforcement through the European traditional and historical *** is a remarkable practice consisting of combining different materials to build up a *** technology shows a wide variety of typological,formal,and technological types of buildings across Europe as it is strongly influenced by the nature and availability of local materials,the cultural aspects of the various communities,and the soils geological *** a consequence,the same constructive typology is based on different premises and leads to many interesting *** this paper the various uses of such a mixed stone-timber masonry are shown in relation to the above mentioned *** of the most interesting aspect is the use of such a mix stone-timber as an anti-seismic device,especially in the Southern and Mediterranean countries,giving evidence to a great sensibility of the ancient builders to very specific *** is also important to stress that this traditional technology is also highly contemporary being exploited in many countries,especially in the far northern ***,novel regulations have been issued in order to regulate such a discipline,especially the use of timber for large structure and ***,as a very common constructive technology,many historical buildings present such a mixed structural configuration,independently from the generating *** such a perspective,this study aims to describe the most common constructive features,as well as develop guidelines for preservation,whereas the typology is present,or design criteria for consolidation and structural improvement,whereas necessary.

关键词： stone masonry timber constructive technology construction material