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Construction & building materials 93건

  1. [해외논문]   Editorial Board   SCIE SCOPUS


    Construction & building materials v.168 ,pp. ii - ii , 2018 , 0950-0618 ,

    초록

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [해외논문]   Influence of particle size and addition of recycling phenolic foam on mechanical and flame retardant properties of wood-phenolic composites   SCIE SCOPUS

    Zhang, Longfei (Corresponding author.) , Liang, Shanqing , Chen, Zhilin
    Construction & building materials v.168 ,pp. 1 - 10 , 2018 , 0950-0618 ,

    초록

    Abstract To recycle the thermoset phenolic foam (PF) wastes, a new flame-retardant panel was developed using milled PF particles and natural wood fibers (WB). PF particles were smashed into three particle size, pre-modified and blended with the sizing fibers in five wt% contents (0, 10, 20, 30, 40%). Each type of mixtures was hot-pressed at same temperature. Physical, mechanical and flame-retardant properties of WB-PF composites were investigated. The mechanical properties of WB-PF composites were found to be rapidly declined with the increasing proportion and size of PF particles. There was also a progressive decrease in thickness swelling for the boards with increasing addition of PF particles. The ultimate fire-retardant property of the boards was remarkably enhanced with more addition and smaller size of PF particles. Among the WB-PF composites, panel with 30 wt% of PF particles had optimum results. The final board with good physical-mechanical and fire-retardant properties can find application in fields like muti-functional furniture, construction, house ware, etc. Highlights Recycling PF particles can be reused with wood fibers for flame retardant panels. A striking decline in thickness swelling was noted after adding PF particles. Mechanical and thermal properties were affected by size and ratio of PF particles. Optimal particle size and addition amount were 80–120 mesh and wt 30%, respectively.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   3D visualized tracing of rebar corrosion-inhibiting features in concrete with a novel chemical self-healing system   SCIE SCOPUS

    Dong, Biqin (Corresponding author.) , Ding, Weijian , Qin, Shaofeng , Fang, Guohao , Liu, Yuqing , Dong, Peng , Han, Shiwen , Xing, Feng , Hong, Shuxian
    Construction & building materials v.168 ,pp. 11 - 20 , 2018 , 0950-0618 ,

    초록

    Abstract A novel chemical self-healing system, with sodium monofluorophosphate/ethyl cellulose microcapsules, is designed with the objective of inhibiting rebar corrosion in concrete materials under NaCl solution. The corrosive behavior is traced and analyzed in 3D visualization by the method of micro X-ray computed microtomography (X-ray μCT). Environmental scanning electron microscopy (ESEM) and texture element analysis microscopy (TEAM) are used to verify the results from the X-ray μCT measurement. The experimental results show that typical pitting corrosion features are detected directly by X-ray μCT. The chemical self-healing system, with sodium monofluorophosphate/ethyl cellulose microcapsules, can postpone the rust procedure and effectively inhibit the rust rate of rebar in a simulated corrosion environment. The corrosion-inhibiting performance becomes significant with the microcapsules increasing. Moreover, a linear relationship between volume losses of rebar and time is deduced from the X-ray μCT data. Corresponding corrosion ratios and corrosion rates are quantitatively calculated for comparison of the inhibition afforded by the chemical self-healing system. Highlights A novel chemical self-healing system is designed for inhibiting rebar corrosion in NaCl solution. Rebar corrosion-inhibiting features are 3D visualized traced by X-ray computed microtomography(X-ray μCT) Rebar corrosion-inhibiting effectiveness with microcapsules is qualitatively analyzed from X-ray μCT results.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Assessing the corrosion performance for concrete mixtures made of blended cements   SCIE SCOPUS

    Ibrahim, Mohamed Atef (Faculty of Engineering, Structure Engineering Department, Cairo University, Egypt ) , Sharkawi, Alaa El-Din M. (Faculty of Engineering, Structural Engineering Department, Tanta University, Egypt ) , El-Attar, Mohamed M. (Faculty of Engineering, Structure Engineering Department, Cairo University, Egypt ) , Hodhod, Osama A. (Faculty of Engineering, Structure Engineering Department, Cairo University, Egypt)
    Construction & building materials v.168 ,pp. 21 - 30 , 2018 , 0950-0618 ,

    초록

    Abstract Although it has been used worldwide for decades, manufacturing of Blast Furnace Slag Cement (CEM III/A) has boomed since it was specified in the Egyptian Cement Standard ESS 4756 on 2006. However, corrosion protection efficiency of the Egyptian (CEM III/A) cement has rarely investigated. Therefore, in this research work corrosion performance was investigated for different concrete mixtures made of Egyptian manufactured (CEM III/A 42.5N), (CEM III/A 42.5N) partially replaced with fly ash and Ordinary Portland cement (CEM I). A total of 432 reinforced concrete (i.e. lollipop) specimens were exposed to impressed current accelerated corrosion technique. In addition to the cement types, the corrosion influence of the concrete mixture water/binder (w/b) ratio and cement content were assessed as well as the impact of reinforcement cover and exposure duration on reinforced concrete specimen’s corrosion performance. The corrosion protection was assessed by the corrosion current and it was quantified by measuring the rebar diameter loss. The chloride ion penetrability, water permeability and measured corrosion current were significantly reduced by replacing (CEM I) with either (CEM III/A) or (CEM III/A + FA) cements specially for large reinforced concrete cover having optimum cement content and minimum w/b ratio with suitable workability. Highlights High slag cement (CEM III/A) significantly improves concrete corrosion protection. No significant protection advantage was achieved in case of replacing 20% (CEM III/A) with fly ash. Optimum, rather than the highest, cement content provides best corrosion protection. Protection improvement was more efficient for large cover and low water/binder.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   Effect of nanomaterials on ageing and moisture damage using the indirect tensile strength test   SCIE SCOPUS

    Ló (Departamento de Ingeniería Civil y Ambiental, Universitat Politècnica de Catalunya –) , pez-Montero, Teresa (BarcelonaTech, Jordi Girona 1-3, Módulo B-1, 08034 Barcelona, Spain ) , Crucho, Joã (CERIS, CESUR, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal ) , o (CERIS, CESUR, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal ) , Picado-Santos, Luí (Departamento de Ingeniería Civil y Ambiental, Universitat Politècnica de Catalunya –) , s (BarcelonaTech, Jordi Girona 1-3, Módulo B-1, 08034 Barcelona, Spain) , Miró , , Rodrigo
    Construction & building materials v.168 ,pp. 31 - 40 , 2018 , 0950-0618 ,

    초록

    Abstract Environmental conditions as well as traffic loads lead to the deterioration of asphalt pavements during their service life. For this reason, the use of nanomaterials that improve the mixtures behaviour could be interesting. The behaviour of two mixtures made with binder modified with nanoclay and nanoiron, and their strength against ageing and moisture damage is studied. Mixtures have been subjected to ageing by two procedures: extended heating, Long-Term Oven Ageing (LTOA), and ultraviolet (UV) plus rainfall simulation, Tecnico Accelerated Ageing (TEAGE). The results show that nanoclay improves the mixture behaviour against ageing, while nanoiron does against moisture damage. Highlights The effect of nanoclay and nanoiron on ageing and moisture damage has been analyzed. Nanoclay seems to retard the hardening process provoked by the ageing phenomenon. Nanoiron modified mixtures show the best behaviour against moisture damage. Mixtures show similar trends against LTOA and TEAGE ageing but in different degrees. The TEAGE ageing procedure seems to replicate better the climate effect on mixtures.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Effect of fine aggregate angularity on skid-resistance of asphalt pavement using accelerated pavement testing   SCIE SCOPUS

    Lin, Cong (Corresponding author.) , Tongjing, Wang
    Construction & building materials v.168 ,pp. 41 - 46 , 2018 , 0950-0618 ,

    초록

    Abstract The effect of fine aggregate angularity (FAA) on the skid-resistance of asphalt pavement was investigated in the paper. To achieve the objective, four fine aggregates with various FAA values were used in stone matrix asphalt (SMA) and conventional asphalt concrete (AC), separately. The Model Mobile Load Simulator (MMLS3) was used to simulate the effect of traffic load on the skid-resistance of compacted mixes. After specific loading cycles, the skid-resistance of asphalt mix slabs was measured using the Sand Patch Test and the British Pendulum Number (BPN) Test. Sand Patch testing mainly explores the macro-texture of the pavement, while BPN test mostly investigates the micro-texture of the pavement. The test results show FAA has a significant impact on skid-resistance on the macro-texture level but an only marginal influence was observed on the micro-texture level. The correlation between FAA and skid-resistance is validated using a Forward Selection method. Outcomes of this experimental study can potentially be adopted by both practitioners and researchers. Highlights Fine aggregate angularity had significant impact on macro-texture level while little on micro-texture level. The prediction model of MTD was developed using FAA values and loading cycles. Generally, the initial skid-resistance can predict the final skid-resistance. The skid-resistance on the macro-texture level reached stability earlier than that on the micro-texture level.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Characteristics of dissipated energy of concrete subjected to cyclic loading   SCIE SCOPUS

    Song, Zhengyang (Corresponding author.) , Frü , hwirt, Thomas , Konietzky, Heinz
    Construction & building materials v.168 ,pp. 47 - 60 , 2018 , 0950-0618 ,

    초록

    Abstract Based on dissipated energy approach (DEA), the energy dissipation characteristics of concrete samples subjected to uniaxial cyclic loading have been investigated. The effect of different cyclic load levels on energy dissipation is quantitatively analyzed by different damage indicators during cyclic fatigue tests. It is concluded that the cumulative speed of energy dissipation and increasing growth-rate of damage indicators in Continuum Damage Theory (CDT) follow an exponential function in relation to the maximum cyclic load level and follow a logarithmic function in relation to the minimum cyclic load level. The loading strategy has an effect on total energy dissipated during fatigue tests, in other words: Energy dissipation and damage evolution are stress path dependent. Highlights Dissipated energy and damage variables in CDT have similar evolution characteristic. Damage evolution and maximum load level can be well fitted by exponential functions. Damage evolution and minimum load level can be well fitted by logarithmic functions. The damage evolution inside the concrete is inhomogeneous. Energy dissipation and damage evolution is stress path dependent.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Laboratory study on use of RAP in WMA pavements using rejuvenator   SCIE SCOPUS

    Farooq, Mohammad Adnan (N.I.T Srinagar, J&K 190006, India ) , Mir, Mohammad Shafi (Civil Engineering Department, N.I.T Srinagar, J&K 190006, India ) , Sharma, Ankit (N.I.T Srinagar, J&K 190006, India)
    Construction & building materials v.168 ,pp. 61 - 72 , 2018 , 0950-0618 ,

    초록

    Abstract The use of rejuvenator showed improved workability of Recycled Asphalt Pavement (RAP) via incorporating Hot Mix Asphalt (HMA) mixes by softening the stiff binder of RAP. The study determines the effect of using Used-Mobile Engine Oil (rejuvenator/softening agent) on engineering properties of RAP-WMA mixes prepared with additive, Evotherm. The study determines optimum dosage of rejuvenator for 20:80, 30:70, 40:60, 50:50 and 60:40 RAP-WMA mixes. With no rejuvenator, only up to 20% RAP could be used to prepare RAP-WMA mixes. For all the RAP-WMA mixes at their respective optimum rejuvenator dosages, Marshall stability, flow value, air voids, Marshall quotient, tensile strength ratio, retained stability, compactibility, aggregate coating were within specified limits (MORTH) as required for Dense Bituminous Macadam. Highlights 20:80 RAP-WMA mix shows better mechanical properties, both with and with no rejuvenator. With no rejuvenator, up to 20% RAP can be used to prepare RAP-WMA mix. With rejuvenator, up to 60% RAP can be used to prepare RAP-WMA mix. The optimum rejuvenator dosages for 20:80, 30:70, 40:60, 50:50 and 60:40 RAP-WMA mixtures are 10%, 10–12.5%, 12.5–17.5%, 15–17.5% and, 17.5–20% respectively. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Freezing and thawing resistance of cellular concrete containing binary and ternary cementitious mixtures   SCIE SCOPUS

    Shon, Chang-Seon (Department of Civil Engineering, Nazarbayev University, 53, Kabanbay Batyr Ave., Astana, Kazakhstan ) , Lee, Dongoun (Department of Architectural Engineering, Dongseo University, 47 Jurye-ro, Sasang-gu, Busan 47011, South Korea ) , Kim, Ji-Hyun (Department of Architectural Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 48513, South Korea ) , Chung, Chul-Woo (Department of Architectural Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 48513, South Korea)
    Construction & building materials v.168 ,pp. 73 - 81 , 2018 , 0950-0618 ,

    초록

    Abstract Cellular concrete (CC) is a foamed low-density and low-strength material made with cement and/or lime, silica-rich material (sand, slag, or fly ash), water, fine aggregate and a foaming agent. The CC containing millions of evenly distributed, uniformly sized macroscopic air-voids of approximately 0.1–1 mm in size is considered to have good freeze-thaw (F-T) resistance. In the present study, the CC of binary and ternary cementitious mixtures with varying proportions of portland cement, fly ash, and lime were explored in a comprehensive laboratory test program related to porosity, water absorption, dry density, compressive strength, and resistance to F-T including durability factor and loss of mass. For selected mixtures, air-void spacing factor and air-void distribution had been determined. Test results showed that compressive strength of CC was primarily as a function of the porosity and density regardless of type of cementitious material with respect to the combination of binary and ternary cementitious mixture. It was also found that higher porosity did not necessarily result in higher water absorption. CC was generally found to present good F-T resistance compared to non-aerated concrete although the CC with high porosity did not necessarily result in higher resistance of F-T. The addition of fly ash to mixture led to a decrease in the number of air voids smaller than 300 μm. It was also found the F-T resistance of CC was more affected by the size of the air-void. The number of air-voids smaller than 300 μm played a critical role on reducing the F-T damage in CC. Highlights The compressive strength of cellular concrete was primarily affected by porosity and density. Higher porosity did not necessarily result in higher water absorption. Air-voids smaller than 300 μm played a critical role in increasing freeze-thaw resistance.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   Effect of high temperatures on gypsum-based composites   SCIE SCOPUS

    Dolež (Corresponding author.) , elová , , Magdalé , na , Scheinherrová , , Lenka , Krejsová , , Jitka , Vimmrová , , Alena
    Construction & building materials v.168 ,pp. 82 - 90 , 2018 , 0950-0618 ,

    초록

    Abstract The behaviour of several gypsum-based materials at high temperatures was investigated. Three gypsum-based binders, pure gypsum, binary gypsum-lime binder and ternary gypsum-lime-silica fume binder were exposed to temperatures up to 1000 °C. From each binder paste (binder and water) and mortar (binder and mortar and silica sand) were prepared. The basic physical and mechanical properties of the materials after heating were measured. With the exception of gypsum-lime paste, all the materials performed well at temperatures up to 400 °C. Gypsum paste achieved the best residual strength at 1000 °C (about 30% of the original value). The volume changes could be effectively reduced by adding silica sand, but the strength of the mortars was about 10% lower than the strength of the pastes. The volume changes in mortars were three times less than the volume changes of the pastes. The presence of aggregates also prevents the disintegration of gypsum-based materials. The best resistance against high temperatures was found for pure gypsum materials. The ternary materials have similar residual strength to cement-based pastes and mortars, while the behaviour of the binary materials was significantly worse. Highlights Gypsum-based pastes and mortars were exposed to the temperatures up to 1000 °C. Volume changes of mortars were three times smaller than volume changes of pastes. Pure gypsum demonstrated the higher residual compressive strength at 1000 °C. Gypsum-lime material featured the least favourable behaviour at high temperatures. Properties of gypsum-lime-silica fume binder are sufficient for common use.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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