Construction and Building Materials最新文献

{"title":"Exploration of fungal resistivity and mechanical performance of Zn-phases-doped geopolymers: ZnO and Zn/Al-LDH nanoparticles","authors":"M. Ramadan,&nbsp;D.G. Sayed,&nbsp;Faten A. Selim","doi":"10.1016/j.conbuildmat.2024.139369","DOIUrl":"10.1016/j.conbuildmat.2024.139369","url":null,"abstract":"<div><div>Generation of green geopolymer pastes that are based on a 1:1 slag/fly ash ratio (Geo) is the main objective of this study owing to the limited production of cementitious slag in Egypt. Different doses of ZnO and Zn-Al-CO₃ layered double hydroxide (LDH) were individually incorporated in geopolymer pastes to attain our aim and are coded Geo, Geo-0.5 %ZnO, Geo-1 %ZnO, Geo-0.5 %LDH, and Geo-1 %LDH. Setting times of fresh pastes and compressive strength of hardened pastes up to 28-days of conventional alkali-activation have been measured. Setting times of fresh pastes and compressive strength of hardened pastes up to 28-days of conventional alkali-activation have been measured. The results confirmed that adding ZnO and LDH NPs to the neat geopolymeric paste (Geo) significantly accelerated the setting process within 7–23 mins, especially for samples Geo-1 %ZnO and Geo-1 %LDH with 7/17 and 8.4/17.5 min., respectively. On the other hand, mechanical results indicated that pastes containing zinc oxide had poor compressive strength, especially in the early stages while 0.5 % LDH nanoparticles had a positive role as the strength values reached 8.9, 40, 60 MPa at 1, 7, and 28 days of curing, respectively. This behaviour is attributed to creating different types of zinc/silicon-containing phases like zinc-alumino-silicate-hydrates (Z-A-S-H, Zn₆Al₁₂Si₁₂O₄₈.29H₂O), zinc-silicate-hydroxide-hydrate (Z-S-H, Zn₄Si₂O₇(OH)₂·H₂O) and calcium-zinc-silicate (CaZnSi₂O₆) which detected by XRD. Moreover, TGA and SEM techniques affirmed the catalytic performance of LDH nanoparticles inside the geopolymeric structure as extra quantities of CSH, CASH, and C₃AH₆ have been generated. Anti-fungal activity test for some selected geopolymeric pastes was conducted via agar diffusion test (ASTMD4300–1). Geo-0.5 % ZnO and Geo-0.5 %LDH samples possessed the highest recorded inhibition zones against <em>Aspergillus Niger and Mucor Circinelloid -AUMMC 11656,</em> especially against <em>Penicillium Glabrum-OP69417</em> with 51±1, and 67±2, respectively.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139369"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of hybrid steel/bamboo fibers on the static performance and microstructure of UHPC","authors":"Hua Zhao ,&nbsp;Jie Tang ,&nbsp;Tao Zhou ,&nbsp;Ziwei Li ,&nbsp;Tianwang Xiong ,&nbsp;Baomin Wang","doi":"10.1016/j.conbuildmat.2024.139326","DOIUrl":"10.1016/j.conbuildmat.2024.139326","url":null,"abstract":"<div><div>This study introduces a novel approach to ultra-high-performance concrete (UHPC) by hybridizing steel and bamboo fibers, providing a sustainable alternative to traditional fiber-reinforced UHPC without compromising mechanical integrity through the inclusion of biodegradable materials. UHPC was prepared and evaluated for macro- and micro-level properties using bamboo fibers of different lengths (6 mm, 12 mm, and 18 mm) combined with steel fibers, with a total fiber volume content of 2.0 %. Results show that combining 0.5 %–1.5 % of 12 mm bamboo fibers with 1.5 %–0.5 % steel fibers achieves an optimal balance, enhancing the flexural strength and toughness of UHPC while minimizing the trade-off in compressive strength caused by natural fibers. Due to its inherent hygroscopic properties, bamboo fiber reduces drying shrinkage in UHPC, forming a moisture-buffering system within the matrix that extends internal curing time and reduces volume changes. Microscopically, bamboo fibers increase UHPC’s porosity, which promotes sustained hydration and the formation of calcium silicate hydrate (C-S-H) gel. Steel fibers provide the structural rigidity and crack resistance necessary to maintain UHPC’s mechanical performance, creating a synergistic reinforcement mechanism. This study pioneers a green reinforcement strategy in ultra-high-performance concrete through the complementary use of natural and synthetic fibers, laying a foundation for further development of high-performance, eco-friendly concrete materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139326"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanoarchitectonics of SiO2 composite hydrogel in inorganic solution: Simulation and experimental analysis","authors":"Chuanhong Kang,&nbsp;Jixiang Guo,&nbsp;Pengcheng Xue,&nbsp;Jiao Li","doi":"10.1016/j.conbuildmat.2024.139391","DOIUrl":"10.1016/j.conbuildmat.2024.139391","url":null,"abstract":"<div><div>Polyacrylamide hydrogels are widely used in medicine, petrochemical, water treatment and other fields, among which polyacrylamide hydrogels play an important role in oilfield Profile control and water shutoff and enhanced oil recovery, however, there are few reports on the effect of different inorganic salt solutions on the properties of SiO₂ composite hydrogel. In this paper, a cross-linked SiO₂ composite hydrogel was constructed using Materials Studio software for the first time, and its structure and properties in inorganic salt aqueous solutions were studied. The results show that the addition of inorganic salts can weaken the interaction between water molecules and hydrogels, and this effect is minimal in calcium chloride solution. The radial distribution function shows that there are strong hydrogen bonds between nitrogen and oxygen atoms in the amide group and water molecules, but there are van der Waals forces between oxygen and water atoms, and the addition of inorganic salts will enhance the hydration of nitrogen atoms in the amide group and the interaction between monovalent ions and amide groups was greater than that between bivalent ions. At the same time, the addition of inorganic salts can also enhance the diffusion ability of water molecules and the fluidity of polymer chains. Among the four inorganic salt solutions, Calcium chloride solution has the least effect on the polymer chain and the cross-linked SiO₂ composite hydrogel has the best expansion performance in calcium chloride solution, which is basically consistent with the experimental results, this has a potential application prospect in the reservoir with high calcium content for profile control and water plugging and enhanced oil recovery.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139391"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface adhesion enhancement and multi-scale evaluation of recycled concrete aggregate(RCA) and asphalt","authors":"Yueqin Hou ,&nbsp;Xuejun Zhang ,&nbsp;Jie Liu ,&nbsp;Chengchen He ,&nbsp;Xiaoping Ji","doi":"10.1016/j.conbuildmat.2024.139271","DOIUrl":"10.1016/j.conbuildmat.2024.139271","url":null,"abstract":"<div><div>Interfacial enhancement is an important way to ensure the road performance of RCA-containing asphalt mixtures. In this paper, RCA was enhanced by four methods, namely acid solution immersion(ASI), volcanic ash slurry immersion(VASI), Nano-SiO₂/cement material composite modification(NM) and lime water immersion(LWI), and the enhancement effect was evaluated using four indicators, namely, three-dimensional surface roughness on the RCA surface, surface energy parameter, adhesion work between RCA and asphalt, and predicted macroscopic bond strength between RCA and asphalt. The results showed that both ASI and LWI resulted in an increase in the 3D surface roughness of RCA, which was reduced after VASI and NM; the surface energy parameters of RCA and the adhesion work with asphalt were effectively increased after LWI, NM, and VASI. The predicted macroscopic adhesion strength of RCA after hydrochloric acid immersion(HAI) and LWI was increased by 1.55 %, 17.81 % and 17.81 %, respectively. The predicted macroscopic adhesion strength of RCA to asphalt decreased by 0.04 %, 10.85 %, and 18.67 % after phosphoric acid solution immersion(PAI), VASI, and NM, respectively; considering the four types of reinforcement, LWI and ASI were the more economical and effective reinforcement methods.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139271"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the creep performance of Grade 8.8 and 10.9 high-strength bolts at elevated temperatures","authors":"Ziqi Wang ,&nbsp;Suting Zhao ,&nbsp;Weiyong Wang ,&nbsp;Shan-Shan Huang","doi":"10.1016/j.conbuildmat.2024.139389","DOIUrl":"10.1016/j.conbuildmat.2024.139389","url":null,"abstract":"<div><div>High-strength bolts are widely used in beam-column connections which are typically subjected to significant pretension and experience high stress levels. Under fire conditions, high-strength bolts may exhibit noticeable creep deformation due to the combined effects of high stress and high temperature, which may result in significant deformation of the connection, thereby threatening the stability of the structure. This paper reports an experimental study on the creep behavior of Grade 8.8 and 10.9 high-strength bolts at elevated temperatures. A series of tensile tests are conducted on high-strength bolts at elevated temperatures, and varying stress ratios are set based on the yield strength measured form the tensile tests. Test results indicate that the temperature has significant influence on the mechanical properties of Grade 8.8 and 10.9 high-strength bolts. Through the entire temperature range, current specifications significantly overestimate the yield strength of high-strength bolts at high temperatures. At the same temperature, the development of creep strain over time is positively related to the stress ratio. An increase in stress ratio from 0.4 to 0.6 or 0.8 results in a maximum 7.8-time increase in creep strain. The temperature of 500℃ can be regarded as the critical temperature at which the creep effects of Grade 8.8 and Grade 10.9 high-strength bolts should be considered. The mechanical property prediction equations and a modified creep model for Grade 8.8 and 10.9 high-strength bolts were developed, which have high reliability in predicting the high-temperature mechanical properties and creep behavior of high-strength bolts.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139389"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cross-scale time-varying prediction model of oxygen diffusion in unsaturated concrete","authors":"Jun Xu ,&nbsp;Chuanye Su ,&nbsp;Chuanqing Fu","doi":"10.1016/j.conbuildmat.2024.139374","DOIUrl":"10.1016/j.conbuildmat.2024.139374","url":null,"abstract":"<div><div>The oxygen diffusion coefficient is a key factor in predicting the service life of reinforced concrete structures. However, cross-scale time-varying predictive modelling of oxygen diffusion in unsaturated concrete has not been carried out. In this study, firstly, the concrete pore structure is simplified as the Menger sponge model, and the effects of pore parameters, hydration degree and fractal dimension on the five oxygen diffusion mechanisms in unsaturated concrete are considered; Secondly, the pore parameters, degree of hydration and fractal dimension are analyzed with respect to time, taking into account the time-varying pore microstructure of concrete; Lastly, a cross-scale time-varying prediction model for oxygen diffusion in concrete under unsaturated state is established that includes the time-varying parameters and takes into account the five diffusion mechanisms; Finally, a cross-scale time-varying prediction model of oxygen diffusion in concrete under unsaturated condition is established with time-varying parameters and considering five diffusion mechanisms. The results show that the oxygen diffusion coefficient decreases with the increase of hydration degree, water saturation, and fractal dimension. This study will provide a theoretical basis for predicting the life of reinforced concrete in the marine environment.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139374"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revealing the effect of hydroxyethyl methyl cellulose ether on rheological characteristics and hydration kinetics of Ultra-High Performance Concrete with high thixotropy","authors":"F.X. Chen ,&nbsp;Y. Leng ,&nbsp;G.Z. Zhang ,&nbsp;K. Wei ,&nbsp;L. Jin ,&nbsp;T.Y. Yin ,&nbsp;R. Yu.","doi":"10.1016/j.conbuildmat.2024.139388","DOIUrl":"10.1016/j.conbuildmat.2024.139388","url":null,"abstract":"<div><div>In this study, the effects of hydroxyethyl methyl cellulose ether (HEMC) content and molecular chain on rheological characteristics and hydration kinetics of Ultra-High Performance Concrete (UHPC) with high thixotropy are detailed investigated. The results showed that with an increase of HEMC content, the air content of UHPC can be increased, and the mechanical properties and durability of UHPC could be simultaneously deteriorated. In addition, although a higher air content may reduce the mechanical properties and durability of UHPC, the added HEMC with longer molecular chain is also helpful to increase the yield stress by 312.2 % and decrease the plastic viscosity by 46.5 % for UHPC slurry, which is important to improve the spray-ability of UHPC. At the same time, the HEMC with short molecular chain can reduce the early autogenous shrinkage of the UHPC by about 30 %, which is also important to improve the volume stability of sprayed Ultra-High Performance Concrete (SUHPC). Therefore, in practice, to develop a SUHPC with advanced properties, the type and content of HEMC should be well chosen by simultaneously considering the requirements of rheological properties, mechanical properties and durability at least.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139388"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low carbon footprint lightweight GPM production: Optimization of carbon fiber and hydrogen peroxide","authors":"Ali İhsan Çeli̇k ,&nbsp;Ufuk Tunç ,&nbsp;Ramazan Kayabaşı ,&nbsp;Mehmet Cemal Acar ,&nbsp;Ahmet Şener","doi":"10.1016/j.conbuildmat.2024.139342","DOIUrl":"10.1016/j.conbuildmat.2024.139342","url":null,"abstract":"<div><div>This study examines the effects of using Carbon Fiber (CF) and Hydrogen Peroxide (H₂O₂) on the mechanical and thermal properties of ground Raw Perlite (RP) based Geopolymer Mortar (GPM). It focuses on determining the optimal dosages of CF and H₂O₂. This study aims to make perlite-based GPMs that form strong bonds with alkali activators lightweight, while also improving their compressive, tensile, flexural, and thermal properties. Sodium Silicate (Na₂SiO₃) and Sodium Hydroxide (NaOH) were used as alkali activators, while H₂O₂ served as the foaming agent. The NaOH solution was 13 M, and Na₂SiO₃ was used with a 2-module specification. In this context, a reference GPM was prepared using RP and Crushed Sand (CS). CF was chosen for its advantages, such as low density, high Young's modulus and tensile strength. Various amounts of CF and H₂O₂ were used to determine the optimal dosage to achieve a durable and lightweight mortar. The results showed that the best performance was achieved with 1 % CF and 1 % H₂O₂. Compressive strength increased to around 3.5 MPa with the addition of 2 % H₂O₂ and 2 % CF. It was found that the use of CF provided significant protection in compressive and flexural strength, but increasing the fiber weight or volume ratio beyond a certain dosage could decrease strength efficiency. These findings support the use of 6 mm CF as a reinforcing material in GPMs within the construction industry while emphasizing the need to avoid exceeding a 2 % H₂O₂ ratio. The results of this research can be considered an important step toward developing environmentally friendly and durable building materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139342"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on eccentric compressive performance of RC columns strengthened with textile-reinforced high-strength high ductile concrete","authors":"Ding Wei ,&nbsp;Mingke Deng ,&nbsp;Tong Li ,&nbsp;Ruizhe Li ,&nbsp;Hui Chen ,&nbsp;Xinlong Wang","doi":"10.1016/j.conbuildmat.2024.139382","DOIUrl":"10.1016/j.conbuildmat.2024.139382","url":null,"abstract":"<div><div>Textile-reinforced concrete (TRC) exhibits limited efficiency in strengthening RC columns, primarily due to low textile utilization and inadequate compressive strength. To improve the compressive performance of RC columns, high-strength high ductile concrete (HSHDC) is employed to replace the concrete in TRC, forming textile-reinforced HSHDC (TR-HSHDC). HSHDC possesses a compressive strength exceeding 100 MPa and a peak tensile strain of 2 %, with internal short fibers contributing to improved textile utilization. Eight RC columns, including two control columns, one HSHDC-strengthened column, and five TR-HSHDC-strengthened columns, were tested under eccentric loading. The experimental parameters included initial eccentricity, level of preloading, and number of textile layers. The results indicated that the strengthened columns exhibited good integrity at failure and generated fine cracks on the surface. Under non-preloading conditions, the load-bearing capacity and ductility gain caused by TR-HSHDC jackets were from 48.6 % to 181.7 % and 12.1–59.3 %, respectively. As the initial eccentricity increased, the load-bearing capacity gain improved. However, the strengthening effect decreased as the level of preloading increased, which was attributed to the strain lag of the strengthening material. Finally, based on the plane cross-section assumption, a calculation formula considering strain-lag behavior was established to predict the maximum load of the column strengthened with TR-HSHDC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139382"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and experimental study of corrosion-induced shape-memory fibers for crack repair","authors":"Yuyan Sun ,&nbsp;Dongkai Wang ,&nbsp;Ziguo Wang ,&nbsp;Zihao Han ,&nbsp;Haocheng Zhang ,&nbsp;Shaotao Ma ,&nbsp;Xiangjia Kong","doi":"10.1016/j.conbuildmat.2024.139349","DOIUrl":"10.1016/j.conbuildmat.2024.139349","url":null,"abstract":"<div><div>Repairing concrete cracks is crucial for enhancing the safety and durability of concrete structures. However, current repair technologies face limitations in corrosive environments such as marine settings. This study presents a novel corrosion-induced shape-memory fiber (CSF) based on the concept of corrosion-induced intelligent fiber (CIF). The CSF₁ was made by coating elongated spandex-covered yarn with polyvinyl alcohol, and the CSF₂ was prepared by winding stretched nylon fiber with iron wire. Experimental results demonstrate that CSF₁ specimens can rapidly heal a 10 mm wide crack within two seconds when exposed to water, while CSF₂ specimens exhibit obvious shape recovery when exposed to seawater. Moreover, under midspan loads, pre-cracked CSF₂-acrylic plate specimens achieve effective crack closure in seawater. These findings confirm the successful transfer of prestress from CSFs to the matrix, thereby validating the feasibility of CIF-based crack repair theory. This research provides experimental evidence for designing and optimizing self-repairing composite materials tailored for various corrosive environments and engineering applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139349"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}