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Thermal performance of lightweight concrete applications in building envelopes in Lebanon

Building Simulation 2021年第5期14卷 1359-1375页

作者： Emilio Sassine Elias Kinab Yassine Cherif Emmanuel Antczak Michel Nasrallah Lebanese University Habitat and Energy UnitGroup of Thermal and Renewable Energies-Laboratory of Applied Physics(LPA-GMTER)Faculty of SciencesFanar CampusLebanon Lebanese University Faculty of EngineeringRoumiehEl MetnLebanon Univ.Artois ULR4515Laboratoire de Genie Civil et geo-Environnement(LGCgE)BethuneF-62400France CC Technique Memari StreetHamraBeirutLebanon

Innovative building materials are being used in building envelopes for reducing their heating and cooling *** paper aims to assess the thermal impact of using lightweight concrete in Lebanese building constructions by pouring an 8 cm thickness of lightweight concrete on the roof and the slab and replacing traditional hollow concrete block by lightweight concrete *** properties of two different samples were experimentally determined:the first one(558 kg/m^(3))used for the roof and the slab and the second one(1074 kg/m^(3))used for the *** numerical simulations were carried out for a Lebanese traditional detached house using the characteristics of these two *** thermally improved Light Weight concrete building(LWC)was compared to a traditional Lebanese house base case(BC)using a dynamic building energy simulation tool in the four different Lebanese climate zones:coastal,mid-mountain,mountain,and inland *** results highlight the effectiveness of integrating LWC to building envelopes by reducing energy consumption and improving thermal comfort in both winter and summer climate conditions and in the different Lebanese climatic *** paper demonstrates that the use of LWC in the vertical walls replacing the traditional hollow blocks can reduce the heating needs by up to 9%and by up to 13%for cooling *** the other hand,adding a LWC roof screed has a very high impact on cooling and heating energy consumption,which can reach up to 74%in cooling energy savings and up to 24%in heating energy savings.

关键词： lightweight concrete thermal properties building energy simulation thermal insulation climatic conditions

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Cellular lightweight concrete containing high-calcium fly ash and natural zeolite

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International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 462-471页

作者： Khamphee Jitchaiyaphum Theerawat Sinsiri Chai Jaturapitakkul Prinya Chindaprasirt School of Civil Engineering Institute of EngineeringSuranaree University of TechnologyNakhon Ratchasima 30000Thailand Department of Civil Engineering Faculty of EngineeringKing Mongkut's University of Technology ThonburiBangkok 10140Thailand Sustainable Infrastructure Research and Development Center Department of Civil EngineeringFaculty of Engineering Khon Kaen UniversityKhon Kaen 40002Thailand

Cellular lightweight concrete （CLC） with the controlled density of approximately 800 kg/m3 was made from a preformed foam, Type-I Portland cement （OPC）, fly ash （FA）, or natural zeolite （NZ）, and its compressive strength, setting time, water absorption, and microstructure of were tested. High-calcium FA and NZ with the median particle sizes of 14.52 and 7.72 μm, respectively, were used to partially replace OPC at 0, 10wt%, 20wt%, and 30wt% of the binder （OPC and pozzolan admixture）. A water-to-binder mass ratio （W/B） of 0.5 was used for all mixes. The testing results indicated that CLC containing 10wt% NZ had the highest compressive strength. The replacement of OPC with NZ decreased the total porosity and air void size but increased the capillary porosity of the CLC. The incorporation of a suitable amount of NZ decreased the setting time, total porosity, and pore size of the paste compared with the findings with the same amount of FA. The total porosity and cumulative pore volume decreased, whereas the gel and capillary pores increased as a result of adding both pozzolans at all replacement levels. The water absorption increased as the capillary porosity increased; this effect depended on the volume of air entrained and the type or amount of pozzolan.

关键词： lightweight concrete fly ash zeolites compressive strength microstructure water absorption

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Bond Strength Degradation of Corrosive Reinforced lightweight concrete

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Journal of Wuhan University of Technology(Materials Science) 2007年第2期22卷 354-357页

作者：陈月顺 School of Civil Engineering Wuhan University

The influence of reinforced bar corrosion on the bond degradation in lightweight concrete was studied. Accelerated constant current corrosion tests were performed on lightweight reinforced concrete samples, and the influential factors, such as protective layer thickness, reinforced bar diameter and corrosive level were investigated. The constant current step method was used to measure the electric resistance of the concrete protective cover, which was used to characterize the corrosion level of the rebar. Experimental results indicated that the corrosive resistance increased with increasing the cover dimension and decreasing the reinforced bar diameter, and the rate of decrease in the specimen impedance after cracking depended on the cover dimension. A new medium was offered for the further research on the performance degradation of corrosion lightweight concrete.

关键词： Faraday law lightweight concrete accelerated corrosion constant current step accelerated corrosion

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Effects of Vibration Technology and Polyvinyl Acetate Emulsion on Microstructure and Properties of Expanded Polystyrene lightweight concrete

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Transactions of Tianjin University 2009年第2期15卷 145-149页

作者：赵晓艳田稳苓姜忻良张雪松 School of Civil Engineering Tianjin University Civil Engineering Institute Hebei University of Technology China Academy of Building Research

To prevent expanded polystyrene （EPS） beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate （PVA） emulsion was adopted to improve its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstruetures of EPS lightweight concrete were observed by scanning electron microscope （SEM）. Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal performance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight concrete.

关键词： expanded polystyrene(EPS) lightweight concrete vibration with pressure polyvinyl acetate microstructure mechanical properties thermal properties

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lightweight concrete Using Local Industrial By-product

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Journal of Mechanics Engineering and Automation 2014年第6期4卷 505-510页

作者： Deborah Olukemi Olanrewaj u Department of Building Technology Lagos State Polytechnic Lagos +234 Nigeria

Construction is one of the largest users of energy, material resources and water and it is a formidable polluter. One of the major materials used in construction is concrete and ordinary concrete contains about 12% cement which is a major producer of greenhouse gas in the world. The use of waste materials as partial replacement of cement in concrete reduces greenhouse gases, frees up land fill space, and reduces raw materials consumption. This contributes towards sustainable development, as in a sustainable society, nature is not subject to systematically increasing concentrations of substances extracted from the earth＇s crust. This research work explores the possibility of replacing some percentage of cement in concrete with marble sludge powder to produce lightweight concrete. This was achieved by determining the compressive strength and some hardened properties of concrete like sorptivity and carbonation with marble sludge. The results so far have been able to prove that lightweight concrete can be produced when some percentage of cement is replaced with this waste.

关键词： lightweight concrete marble sludge filler carbonation permeation.

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Strength of lightweight concrete Under Triaxial Compression

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China Ocean Engineering 1996年第2期11卷 239-244页

作者： Song Yupu, Zhao Guofan , Peng Fang and Shen Jina Doctor, Professor, Dalian University of Technology, Dalian 116023 . Professor, Dalian University of Technology, Dalian 116023 Doctor, Dalian University of Technology, Dalian 116023 Engineer, Dalian University of Technology, Dalian 116023 Dalian University of Technology Dalian 116023

The strength of lightweight concrete under triaxial compressive stress is studied experimentally with the concrete triaxial apparatus designed by the authors, and is compared with that of normal concrete under the same stress state. Ninety-five 100 mm cubes under twenty stress ratios are tested. As compared with normal concrete, it is found that not only the multiaxial compressive strength of lightweight concrete is small, but also the ratio of the multiaxial compressive strength to the uniaxial compressive strength is small. The influence of the intermediate principal stress on the multiaxial strength of lightweight concrete is discussed. The strength criteria which are expressed in the principal stresses and the octahedral stresses respectively are proposed.

关键词： lightweight concrete triaxial compression strength criterion triaxial test

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Development of lightweight concrete Using Industrial Waste Palm Oil Clinker

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Journal of Civil Engineering and Architecture 2020年第6期14卷 293-307页

作者： Ibrahim Abdulrazak Al-Ani Wan Hamidon Nadhir Al-Ansari Wan Hanna Mohtar Department of Civil Engineering Al-Farabi University CollegeBaghdadP.O.Box 12083Iraq Department of Civil&Structural Engineering National University of MalaysiaBangi 43600SelangorMalaysia Department of Civil Environmental and Natural Resources Engineering Lulea University of TechnologyLulea 97187Sweden

concrete is a major material used in the construction of buildings and structures in the *** and sand are the major ingredients of concrete but are non-renewable natural ***,the utilisation of palm oil clinker(POC),a solid waste generated from palm oil industry is proposed to replace natural aggregate in this research to reduce the demand for natural *** mix of ordinary concrete as control concrete;while four mix proportions of oil palm clinker concrete were obtained by replacing 25%,50%,75%,and 100%of gravel and sand of control concrete with coarse and fine oil palm clinker respectively by volume,with same cement content and water cement *** strength test was carried out of concretes with different percentages of oil palm clinker;whereas water absorption tests according to respective standard,were carried out to determine the durability properties of various *** on the results obtained,the study on the effect of percentage of clinker on strength and durability properties was *** to ACI classification of light weight concrete only the 100 percentage replacement can achieve the definition of light weight concrete since its density is less than 1,900 kg/m3 and strength larger than 17 *** the 25%replacement of the normal aggregate by the OPC will improve the strength and durability of the concrete.

关键词： lightweight concrete palm oil clinker industrial waste Malaysia

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A Research on the Usage of Corn Cob in Producing lightweight concrete

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Natural Resources 2021年第10期12卷 339-347页

作者： Sermin Polat Department of Irrigation and Drainage Faculty of Agricultural Engineering University of Ege Bornova-Izmir Turkey

In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete has been investigated. First, some important physical properties of corn cob have been determined in the laboratory. These properties are as follows: weight to volume ratio (unit weight), water absorption rate and granulometric analysis. Later on, 4 concrete mixtures have been prepared according to the workability of concrete and standards specified in Turkey. After that, unit weight, heat transmissibility coefficient and 28-day pressure strength of these 4 concrete samples have been determined using machines measuring these properties. The 28-day pressure endurance value has been found between 1.4 - 56.25 kgf/cm2, heat transmissibility coefficient has been found between 0.19 - 0.35 Kcal/m∙h∙˚C and unit weight of samples have been found between 800 - 1520 kg/m3. Lastly, these properties of concrete samples have been compared with other lightweight materials being used in

关键词： Ground Corn Cob lightweight concrete Aggregate Granulometric Analisi Pressure Strength

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Durability of lightweight concrete Using Oil Palm Shell as Aggregates

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Open Journal of Civil Engineering 2021年第1期11卷 1-13页

作者： Yasmine Binta Traore Adamah Messan Kinda Hannawi Jean Gerard William Prince François Tsobnang Université de Fada N’Gourma/Ecole Supérieure d’Ingénierie (ESI) Fada N’Gourma Burkina Faso Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE) Laboratoire Eco-Matériaux et Habitats Durables (LEMHaD) Ouagadougou Burkina Faso Institut National des Sciences Appliquées de Rennes (INSA-Rennes) Laboratoire de Génie Civil et de Génie Mécanique (LGCGM) Rennes France Centre de Coopération International en Recherche Agronomique pour le Développement (CIRAD) Unité de recherche Biomass Wood Energy and Bioproducts (BioWooEB) Montpellier France

Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over the long term and when it is in aggressive environments. This paper presents the results of studies conducted on the durability of OPS concrete. Water absorption capacity, electrical resistivity and apparent diffusion of chloride ions have been measured on different concrete samples. In addition, the behaviour of OPS concretes to carbonation was studied in an environment rich in carbon dioxide. Results show that OPS concrete has an absorptivity of 0.97 kg/m2·h1/2, an electrical resistivity of 64.37 Ω·m and an apparent diffusion coefficient of chloride ions of 3.84

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Studying the Properties of lightweight concrete Using Construction Materials Waste

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Journal of Environmental Science and Engineering(A) 2015年第6期4卷 295-302页

作者： Aamer Najim Abbas Hussain Haider Abdulzahra Department of Civil Engineering Al-Muastansiriya University Baghdad 00964 Iraq

The main purpose of this research is to study the mechanical properties of lightweight concrete through the using of different types of lightweight aggregate. Three types of lightweight aggregate were used in this study for the production of lightweight concrete. These types are red block aggregate, red ceramic aggregate and white thermostone aggregate. All these types have been brought from construction waste. A comparison of the properties of lightweight concrete with normal concrete is the most important goal of this study. The most important properties of concrete, which were compared with each other is compressive strength, static modulus of elasticity, splitting tensile strength and slump flow.

关键词： lightweight concrete red block aggregate red ceramic aggregate white thermostone aggregate.

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