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Construction & building materials 64건

  1. [해외논문]   Editorial Board   SCIE


    Construction & building materials v.180 ,pp. ii - ii , 2018 , 0950-0618 ,

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  2. [해외논문]   Structural, mechanical and hygrothermal properties of lightweight concrete based on the application of waste plastics   SCIE

    Zá (Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague 6, Czech Republic ) , leská (Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague 6, Czech Republic ) , , Martina (Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague 6, Czech Republic ) , Pavlí (Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Prague, Technická) , ková (5, 166 28 Prague 6, Czech Republic ) , , Milena (Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague 6, Czech Republic ) , Pokorný (Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Th&aacut) , , Jaroslav , Jankovský , , Ondř , ej , Pavlí , k, Zbyš , ek , Č , erný , , Robert
    Construction & building materials v.180 ,pp. 1 - 11 , 2018 , 0950-0618 ,

    초록

    Abstract Three different types of plastic waste replacing up to 50% of natural aggregates are used in concrete mix design. A wide set of basic physical, mechanical, thermal, and hygric properties of developed concretes is determined and their assessment is made using a comparison with reference data. The mechanical parameters, though decreasing with the increasing amount of plastic aggregates, are found satisfactory for non-bearing concrete structures. The up to seven times lower thermal conductivity, as compared with the reference material, provides an evidence of greatly improved thermal insulating capabilities. The hygric properties of designed concretes are characterized by an increase of water and water vapor transport parameters and a decrease of water vapor adsorption capacity with the increasing amount of plastic aggregates. Based on the obtained experimental results, a conclusion can be made that the designed lightweight concretes containing plastic waste aggregates present a prospective solution from the points of view of both plastic waste disposal and improvement of buildings' energy efficiency. Highlights Lightweight concrete with different types of plastic waste-based aggregates. A wide set of basic physical, thermal, and hygric properties. Mechanical parameters satisfactory for non-bearing concrete structures. Interesting solution with respect to plastic waste recycling. Potential energy savings in the building sector. Graphical abstract [DISPLAY OMISSION]

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  3. [해외논문]   Developing geopolymer concrete by using cold-bonded fly ash aggregate, nano-silica, and steel fiber   SCIE

    Their, Jumah Musdif (Corresponding author.) , Ö , zakç , a, Mustafa
    Construction & building materials v.180 ,pp. 12 - 22 , 2018 , 0950-0618 ,

    초록

    Abstract This experimental study presents the effect of nano-silica and steel fiber on the transport properties and compressive strength of alkali-activated slag/fly ash concrete incorporated cold-bonded fly ash aggregate. In order to reduce energy consumption and provide environmental impact, the cold-bonded process was used to manufacture cold-bonded fly ash aggregate. Twenty four geopolymer concrete mixtures incorporated cold-bonded fly ash aggregate, nano-silica, and steel fiber were produced with sodium hydroxide concentration of 12 M and cured at ambient temperature. Transport properties of geopolymers were examined through water penetration, water sorptivity, and gas permeability at 28 and 90 days. Results indicate that geopolymer concrete incorporated cold-bonded fly ash aggregate can be produced with compressive strength as high as 28.23 and 36.62 at 28 and 90 days, respectively. However, 2% nano-silica and 1% steel fiber volume fraction were the most significant parameters that caused remarkable improvement of investigated properties. Moreover, the incorporation of waste materials in aggregate and geopolymer concrete production can alleviate environmental problems. Highlights GPCs have been synthesized using cold-bonded fly ash aggregate (CFA). No elevated temperatures have been used in this study. The dosage of superplasticizer to achieve the target slump value is reduced by the use of CFA. The pore structure of GPC incorporated permeable aggregate is significantly improved by the utilization of nano-silica (NS). Better performance of GPC is achieved by the use of 1% steel fiber and 2% NS.

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  4. [해외논문]   Flexural performance of concrete beams containing engineered cementitious composites   SCIE

    Shanour, Ali S. (Department of Civil Engineering, Shoubra Faculty of Engineering, Benha University, 108 Shoubra St., Shoubra, Cairo, Egypt ) , Said, Mohamed (Department of Civil Engineering, Shoubra Faculty of Engineering, Benha University, 108 Shoubra St., Shoubra, Cairo, Egypt ) , Arafa, Alaa Ibrahim (National Housing and Building Research Centre (HBRC), Cairo, Egypt ) , Maher, Amira (Department of Civil Engineering, Shoubra Faculty of Engineering, Benha University, 108 Shoubra St., Shoubra, Cairo, Egypt)
    Construction & building materials v.180 ,pp. 23 - 34 , 2018 , 0950-0618 ,

    초록

    Abstract Engineered Cementitious Composites (ECC) considers a type of ultra-ductile cementitious composites with fiber reinforcement. It is developed for applications for economic purpose in the construction industry. ECC characterizes by strain hardening and multiple cracking. This paper experimentally investigates the performance of ECC concrete beams reinforced with conventional reinforcement bars. Advanced Polyvinyl Alcohol Engineered Cementitious Composite (PVA-ECC) fibers were selected in this purpose. Twelve RC beams were poured and tested to study flexure behavior under four-point loading test. Two different longitudinal reinforcement percentages, variable volume ratios of (PVA) and polypropylene fibers (PP) were used. optimizing the usage of PVA material trails to put it in the lower layer of the section at point of maximum tension with variable thicknesses was conducted. Initial flexure cracking load, ultimate load, the ductility and the load-to-deflection relationship at various stages of loading were evaluated. Experimental outcomes revealed that the enhancement in maximum capacity is more significant in the case of using PVA rather than PP. The maximum load increases by 20% and 34% for 1.0% and 2.0% of PVA contents in total section respectively. The relative ductility factor increases by 30% and 45% for 1.0% and 2.0% of PVA content. Results also depicted that a reasonable considerable increasing in the load capacity when used limited layer thickness of PVA concrete. Nonlinear Finite Element Analysis (NLFEA) was conducted for the purpose of simulating the behavior of experimentally tested beams, regarding crack behavior and load-deflection response. Reasonable agreement was achieved between the experimental results and NLFEA results. Highlights Performance of concrete beams with Engineered Cementitious Composites ECC. Variable volume fractions of (PVA) and (PP) fibers were used. ECC materials exhibits an improvement in ductility. Load carrying capacity is more significant for using PVA rather than PP. Non-linear finite element analyses were performed and assessed with experimental results.

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  5. [해외논문]   Grout assessment of plastic ducts in prestressed structures with an HHT-based method   SCIE

    Li, Ting (School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China ) , Long, Shi-guo (College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China)
    Construction & building materials v.180 ,pp. 35 - 43 , 2018 , 0950-0618 ,

    초록

    Abstract This paper introduces the detection of grouting quality in plastic ducts in prestressed concrete structures based on impact-echo (IE) testing with an HHT-based method. This method takes steps to suppress unrelated signals. At first, the thickness frequency of the intact concrete whose thickness is equal to the detected concrete is calculated, then a band pass filter is conducted to filtering uncorrelated frequency component. Secondly, complementary ensemble empirical mode decomposition (CEEMD) is used to decompose the signal to intrinsic mode functions (IMFs). Thirdly, an IMF screening process is conducted on the IMFs to extract the main patterns of vibrations related to grouting. At last, the Hilbert marginal cumulative spectra are set up. This method has been verified by both simulated and laboratory models. The cumulative Hilbert marginal spectra showed that the thickness frequencies decreased gradually with the decreasing of grouting compactness. On-site IE tests verified the feasibility and practicability of the proposed method. Highlights An HHT-based method is used for the detection of grouting quality in plastic prestressed pipes. This method takes steps to suppress unrelated signals and extract the main patterns of vibrations. The cumulative Hilbert marginal spectra show that the thickness frequencies decreased gradually with the decreasing of grouting compactness.

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  6. [해외논문]   'Microbial mortar'-restoration of degraded marble structures with microbially induced carbonate precipitation   SCIE

    Minto, James M. (Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, UK ) , Tan, Qian (Department of Civil Engineering, Tsinghua University, Beijing, China ) , Lunn, Rebecca J. (Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, UK ) , El Mountassir, Grá (Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, UK ) , inne (Department of Civil Engineering, Tsinghua University, Beijing, China ) , Guo, Hongxian (Department of Civil Engineering, Tsinghua University, Beijing, China) , Cheng, Xiaohui
    Construction & building materials v.180 ,pp. 44 - 54 , 2018 , 0950-0618 ,

    초록

    Abstract To evaluate a restoration strategy for highly degraded marble structures, microbially induced carbonate precipitation (MICP) has been employed to reduce porosity and permeability in a column filled with coarse crushed marble. A 3D X-ray tomography scan revealed the spatial variation in porosity throughout the column and tracer breakthrough curves, recorded at intervals during treatment, enabled derivation of core-scale fluid transport properties and their alteration by precipitating carbonate. Micro-continuum scale flow modelling based on the X-ray data indicated that treatment led to changes in the pore network structure with flow increasingly focused into a smaller number of faster flowing open channels. Highlights Microbial mortar can successfully restore degraded marble. Reagent transport evolved with each treatment cycle. Micro-continuum flow simulation of 3D X-ray data revealed changing flow paths.

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  7. [해외논문]   Numerical model for corrosion rate of steel reinforcement in cracked reinforced concrete structure   SCIE

    Xu, Feng (Corresponding author.) , Xiao, Yifei , Wang, Shuguang , Li, Weiwei , Liu, Weiqing , Du, Dongsheng
    Construction & building materials v.180 ,pp. 55 - 67 , 2018 , 0950-0618 ,

    초록

    Abstract The presence of cracks in concrete will accelerate the corrosion of steel reinforcement causing the performance degradation of reinforced concrete (RC) structure. Based on the electrochemical principle, a numerical model of macro-cell corrosion has been developed to predict the corrosion rate of steel reinforcement in cracked RC members. In this model, the areas of the separate anode and cathode are established by the crack width, and the electric resistivity of concrete material is modified by considering the effects of water-binder ratio and other factors. When the corrosion rate of steel reinforcement is taken as the mean value of the corrosion current density of anode zone, the corrosion rate can then be numerically solved from the proposed model with given boundary conditions. Test data from the 2-year laboratory experiments of authors and literature has been collected to verify the proposed model. The comparisons between the test and prediction results show that the proposed model is of capability to predict the corrosion rate with a good accuracy. Finally, the parametric studies show that the crack width, water/cement ratio, chloride concentration, thickness of concrete cover, and relative humidity has significant influences on the corrosion rate of reinforcement in cracked RC structure. Highlights Corrosion mechanism of steel reinforcement in cracked concrete structure was modeled. Anode and cathode areas were quantified by crack width based on the debonding property. Effect of crack width on the corrosion rate of reinforcement was numerically analyzed. Electric resistivity of concrete was modified considering effects of various factors.

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  8. [해외논문]   Thermophysical characterization of Posidonia Oceanica marine fibers intended to be used as an insulation material in Mediterranean buildings   SCIE

    Hamdaoui, Ons (Université) , Ibos, Laurent (Paris Est Créteil, CERTES, OSU Efluve, 61 av. du Général de Gaulle, 94010 Créteil Cedex, France ) , Mazioud, Atef (Université) , Safi, Mohamed (Paris Est Créteil, CERTES, OSU Efluve, 61 av. du Général de Gaulle, 94010 Créteil Cedex, France ) , Limam, Oualid (Université)
    Construction & building materials v.180 ,pp. 68 - 76 , 2018 , 0950-0618 ,

    초록

    Abstract The present work focuses on the study of the thermophysical properties of Posidonia Oceanica natural fibers in order to investigate the potential of their use as loose-fill thermal insulation material in the Mediterranean construction. 24 samples were prepared. Bulk densities were varied from 17 kg m −3 to 155 kg m −3 . Chemical alkali treatments with various conditions were applied to these fibers. The influence of treatments and of density on morphological and thermophysical properties of samples was evaluated. The surfaces were examined by using scanning electron microscopic. The thermal measurements were performed with the Hot Disk thermal constants analyzer. Results have shown that thermal conductivity decrease when density decreases until an optimum. After that, it increases as the density is reduced. Furthermore, regarding thermal conductivity, it was found out that the effect of chemical treatment is not significant mainly at the low densities. A very slight improvement was found at high densities with treated fibers, mainly the treatment that consists of immerging fibers twice in 2% sodium hydroxide solution during 2 h at 80 °C. Higher mass heat capacity was observed with this same treatment. Additionally, it was revealed in this study that Posidonia-Oceanica fibers have thermal conductivity and thermal diffusivity close to conventional insulation materials and higher mass heat capacity that reached 2533 J kg −1 K −1 . Highlights Posidonia-Oceanica natural fibers could be used as an ecological loose fill thermal insulation material. Thermal conductivities and thermal diffusivities of the proposed material are close to conventional insulation materials. The material heat capacity is higher than other insulation materials and reached 2533 J kg −1 K −1 . The fibers sodium hydroxide chemical treatment has a slight effect on the thermal properties.

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  9. [해외논문]   Experimental study on seismic performance of fire-exposed perforated brick masonry wall   SCIE

    Zhang, Jin (Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China ) , Ma, Hao (Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China ) , Li, Cheng (Nanjing Longfor Properties Co., Ltd., Nanjing 210000, China ) , Xu, Qingfeng (Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China ) , Li, Weibin (Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China)
    Construction & building materials v.180 ,pp. 77 - 91 , 2018 , 0950-0618 ,

    초록

    Abstract The seismic performance of perforated brick masonry wall was investigated by subjecting six fire-exposed pieces and one unexposed piece to low reversed cyclic loading. Two of the exposed pieces were reinforced with carbon fiber cloth and steel mesh cement mortar. The effect of the fire duration, fire boundary, cooling regime, and reinforcement method on the failure characteristics of the specimens was investigated. The experimental results revealed that (i) for the same position, the temperature of the mortar was higher than that of the brick and (ii) the cracking load and ultimate load of the walls decreased progressively with increasing fire duration. Moreover, the ultimate bearing capacity of the wall reinforced by carbon fiber cloth and steel mesh cement mortar was higher than that of the wall subjected to the same fire duration. This capacity was also higher than that of the unexposed wall. Highlights Seismic performance of fire-exposed perforated brick masonry wall is evaluated. Temperature distributions at different positions and depths of the wall are investigated. Two pieces of fire-exposed walls are reinforced with carbon fiber cloth and steel mesh cement mortar. Load capacity, energy dissipation, and stiffness degradation were quantified.

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  10. [해외논문]   Durability performance of concrete incorporating waste metalized plastic fibres and palm oil fuel ash   SCIE

    Mohammadhosseini, Hossein (Corresponding author.) , Tahir, Mahmood Md.
    Construction & building materials v.180 ,pp. 92 - 102 , 2018 , 0950-0618 ,

    초록

    Abstract With the rising quantity of waste generation from numerous processes, there has been growing attention in the consumption of waste materials in the production of construction materials to attain possible advantages. In this study, the durability performance of concrete comprising waste metalized plastic (WMP) fibres and palm oil fuel ash (POFA) was investigated. Properties studied include air content of fresh concrete in addition to sorptivity, water absorption, chloride penetration, and drying shrinkage of hardened concrete. Six concrete mixes containing 0–1.25% WMP fibres with a length of 20 mm were cast for ordinary Portland cement (OPC). Further, six concrete batches with the same fibre content were made, where 20% POFA substituted OPC. The incorporation of WMP fibres and POFA increased the air content of concrete mixtures. Furthermore, water absorption, sorptivity, and chloride penetration of concrete reinforced with WMP fibres were reduced with volume fractions of up to 0.75% for both OPC and POFA-based mixtures. The positive interaction amongst WMP fibres and POFA consequently led to the reduction in drying shrinkage of the concrete. The influence of POFA on the durability performance of concrete was noticed to be more significant at longer curing periods. The results of the study revealed that there is a promising future for the utilisation of WMP fibres in the production of sustainable and durable concrete. Highlights Waste metalized plastic fibres and POFA were used in the production of durable concrete. Incorporation of WMP fibres and POFA leads to the lower water absorption and sorptivity. WMP fibres can significantly affect the resistance to chloride penetration. WMP fibres caused a reduction in drying shrinkage.

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