Cement and Concrete Research最新文献_第2页

Effect of coarse aggregate on acoustoelastic effect in concrete 粗骨料对混凝土声弹效应的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-14 DOI: 10.1016/j.cemconres.2025.107987

Xia Yang , Minghui Zhang , Xiuquan Li , Hong Hao , Qingzhao Kong

{"title":"Effect of coarse aggregate on acoustoelastic effect in concrete","authors":"Xia Yang , Minghui Zhang , Xiuquan Li , Hong Hao , Qingzhao Kong","doi":"10.1016/j.cemconres.2025.107987","DOIUrl":"10.1016/j.cemconres.2025.107987","url":null,"abstract":"<div><div>The acoustoelastic technique exhibits substantial potential for in-situ stress measurement in concrete. However, concrete, being a complex multiphase material, is subject to various influencing factors on its acoustoelastic properties, encompassing material strength, aggregate size, porosity, temperature, and humidity. A comprehensive understanding of how these factors influence the acoustoelastic characteristics of concrete is imperative for the advancement of acoustoelastic technology in engineering applications. This study concentrates specifically on the coarse aggregate of concrete, a crucial component forming the material's skeleton, and investigates the influence of its placement and size on acoustoelastic coefficient (AEC) of concrete. 25 two-dimensional mesoscale finite element models with varied maximum aggregate diameters were established to explore the influence of aggregates and excitation frequency on acoustoelastic effect in concrete. To streamline calculations, the equivalent elastic constant method was proposed to simulate the acoustoelastic effect in concrete. AECs for all models were determined using the stretching technique. The results indicate that the AEC of concrete tends to rise with increasing ultrasonic excitation frequency. Moreover, both the particle size and placement of aggregates have limited impact on acoustoelastic effect of P-waves in concrete. To substantiate this conclusion, empirical tests were conducted on 15 concrete prism specimens, featuring five distinct aggregate gradations. The experimental outcomes aligned with the numerical predictions, corroborating the findings.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"198 ","pages":"Article 107987"},"PeriodicalIF":10.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622707","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}

引用次数: 0

Evolution of silica gel during post‑carbonation hydration of calcium silicates and its effect on mechanical strength of carbonated matrix 硅酸钙碳酸化后水化过程中硅胶的演化及其对碳酸化基质机械强度的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-11 DOI: 10.1016/j.cemconres.2025.107989

Zhipeng Zhang , Shuai Nie , Zhichao Liu , Fazhou Wang , Shuguang Hu , Barbara Lothenbach

{"title":"Evolution of silica gel during post‑carbonation hydration of calcium silicates and its effect on mechanical strength of carbonated matrix","authors":"Zhipeng Zhang , Shuai Nie , Zhichao Liu , Fazhou Wang , Shuguang Hu , Barbara Lothenbach","doi":"10.1016/j.cemconres.2025.107989","DOIUrl":"10.1016/j.cemconres.2025.107989","url":null,"abstract":"<div><div>Accelerated carbonation of the alkaline industrial wastes as building products has attracted increasing attentions, but the studies on post‑carbonation hydration of the unreacted calcium silicate in these building products remain limited. This study investigates the evolution of silica gel during post‑carbonation hydration of calcium silicates and its effect on mechanical strength. The results indicate that the compressive strength of γ-C<sub>2</sub>S compacts remains unchanged after 28 d of post‑carbonation hydration whereas that of β-C<sub>2</sub>S compacts display a rapid decrease in strength. This is attributed to the dissolution of silica gel into the pore solution with high pH value and the formation of cracks in the carbonated matrix. For C<sub>3</sub>S, the gradual accumulation of C-S-H leads to a continuous increase in compressive strength. These findings provide insights into the mechanism of mechanical strength evolution in outdoor exposed building products made from carbonated industrial solid wastes.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"198 ","pages":"Article 107989"},"PeriodicalIF":10.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596470","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}

引用次数: 0

Basic oxygen furnace (BOF) slag cementitious binder activated by Na4EDTA Na4EDTA活化的碱性氧炉炉渣胶凝粘结剂

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-11 DOI: 10.1016/j.cemconres.2025.107983

Zhihan Jiang , Xuan Ling , Quan Liu , Helong Song , Katrin Schollbach , H.J.H. Brouwers

{"title":"Basic oxygen furnace (BOF) slag cementitious binder activated by Na4EDTA","authors":"Zhihan Jiang , Xuan Ling , Quan Liu , Helong Song , Katrin Schollbach , H.J.H. Brouwers","doi":"10.1016/j.cemconres.2025.107983","DOIUrl":"10.1016/j.cemconres.2025.107983","url":null,"abstract":"<div><div>Basic oxygen furnace (BOF) slag contains two potentially hydraulically reactive phases, belite (C<sub>2</sub>S) and brownmillerite (C<sub>2</sub>(A,F)), yet exhibits low reactivity. This study proposes ethylenediaminetetraacetic acid tetrasodium salt (Na<sub>4</sub>EDTA) as a hydration activator and investigates its effects on BOF slag phase evolution, early hydration kinetics, microstructural development, mechanical properties, and leaching behaviors. The EDTA<sup>4−</sup> chelation mechanism in the BOF slag system is also discussed. Results show that Na<sub>4</sub>EDTA significantly enhances BOF slag hydration, producing a stand-alone binder with high compressive strength (38.8 MPa at 28 d, v.s. 8.6 MPa of the reference) and reduced porosity. At 4.8 wt% Na<sub>4</sub>EDTA, brownmillerite reacts almost completely within one day. Belite hydration is also enhanced, particularly at early ages. The main hydration products are hydrogarnet and C-S-H gel. EDTA itself is likely partially incorporated into the layered double hydroxides (LDHs) structure of hydrotalcite. Heavy metal leaching is below the Dutch legal limits.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"198 ","pages":"Article 107983"},"PeriodicalIF":10.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144603870","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}

引用次数: 0

New insights into linear-nonlinear tensile creep mechanisms of UHPC: Stress level-dependent creep-active site transitions 对UHPC的线性-非线性拉伸蠕变机制的新见解：应力水平相关的蠕变-活性位点转变

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-11 DOI: 10.1016/j.cemconres.2025.107988

Guo Yang , Qian Cao , Haitao Zhao , Jintao He , Le Teng , Zhangli Hu , Wenwei Li , Roman Wan-Wendner , Jiaping Liu

{"title":"New insights into linear-nonlinear tensile creep mechanisms of UHPC: Stress level-dependent creep-active site transitions","authors":"Guo Yang , Qian Cao , Haitao Zhao , Jintao He , Le Teng , Zhangli Hu , Wenwei Li , Roman Wan-Wendner , Jiaping Liu","doi":"10.1016/j.cemconres.2025.107988","DOIUrl":"10.1016/j.cemconres.2025.107988","url":null,"abstract":"<div><div>This study elucidates the micromechanical origins of tensile creep in ultra-high performance concrete (UHPC) under various stress levels by systematically investigating the distribution and evolution of creep-active sites (high-strain micro-zones governing creep behavior) across multiple scales. Results reveal that, at stress levels below 30 %, creep-active sites are randomly distributed throughout the specimen. The slip of C-S-H gel induces synchronized deformation rates in both the matrix and weak zones (e.g., interfacial transition zone (ITZ) and macroscale defect). As stress levels increase (40 %–60 %), creep-active sites localize at 60–800 nm wide microcracks, with strain accumulation rates in weak zones progressively exceeding those in the matrix. At stress levels above 70 %, intensified strain concentrations in ITZ and macroscale defect trigger fracture-dominated nonlinear creep. This work unifies micro-crack theory and C-S-H gel slip mechanisms, demonstrating that the development from linear to nonlinear tensile creep behavior originates from stress level-dependent creep-active site transitions.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"198 ","pages":"Article 107988"},"PeriodicalIF":10.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144603872","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}

引用次数: 0

Characterization of the transitional zone between fully carbonated and non‑carbonated areas in slag-rich cement paste after long-term natural exposure 富渣水泥浆体长期自然暴露后完全碳化区与非碳化区过渡带的表征

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-09 DOI: 10.1016/j.cemconres.2025.107986

Yu Zhang , Shan He , Xuhui Liang , Minfei Liang , Oğuzhan Çopuroğlu , Erik Schlangen

{"title":"Characterization of the transitional zone between fully carbonated and non‑carbonated areas in slag-rich cement paste after long-term natural exposure","authors":"Yu Zhang , Shan He , Xuhui Liang , Minfei Liang , Oğuzhan Çopuroğlu , Erik Schlangen","doi":"10.1016/j.cemconres.2025.107986","DOIUrl":"10.1016/j.cemconres.2025.107986","url":null,"abstract":"<div><div>Due to the gradual diffusion of CO<sub>2</sub> under natural exposure, areas with varied degrees of carbonation exist at different depths from the surface of slag-rich cement paste. While extensive research has been dedicated to investigating the fully carbonated zone as identified by phenolphthalein spray, the transitional zone, located between the fully carbonated and the uncarbonated regions, has received comparatively less attention. This study thus aims to address this research gap by exploring its microstructural, micromechanical, and mineralogical properties. The results reveal that carbonation-induced damage extends beyond the fully carbonated zone as identified by phenolphthalein. Particularly in the transitional area close to the carbonated zone, nanoindentations results reveal that micromechanical properties of this area are even lower to that of the fully carbonated zone. In addition, mineralogical investigation suggest that the depth of carbonation stays within the range where slag-containing blends loses its green coloration. By comparing specimens with different slag composition, it was found that the depth of this faded green area can be an important indicator to assess the carbonation resistance of slag-containing blends.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"198 ","pages":"Article 107986"},"PeriodicalIF":10.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588199","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}

引用次数: 0

Carbonation-Primed Hydration Strategy (CPHS) for stabilizing high-phosphogypsum OPC cement 碳化引发水化策略（CPHS）稳定高磷石膏OPC水泥

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-08 DOI: 10.1016/j.cemconres.2025.107978

Yong Zheng , Xiong Qian , Kai Cui , Yingliang Zhao , DongXing Xuan , Peiliang Shen , Guangqi Xiong , Chi Sun Poon

{"title":"Carbonation-Primed Hydration Strategy (CPHS) for stabilizing high-phosphogypsum OPC cement","authors":"Yong Zheng , Xiong Qian , Kai Cui , Yingliang Zhao , DongXing Xuan , Peiliang Shen , Guangqi Xiong , Chi Sun Poon","doi":"10.1016/j.cemconres.2025.107978","DOIUrl":"10.1016/j.cemconres.2025.107978","url":null,"abstract":"<div><div>Phosphogypsum (PG) presents significant challenges in ordinary Portland cement systems due to its tendency to cause delayed setting, strength reduction, and expansion-related instability, limiting its dosage to below 5 %. To address these limitations, this study proposes a Carbonation-Primed Hydration Strategy (CPHS), wherein phosphogypsum composite cement undergo accelerated CO<sub>2</sub> curing followed by water curing. This two-step approach enables stable incorporation of high PG contents while maintaining mechanical and volumetric performance. Under CPHS, a system with 20 % PG achieved 35 MPa after 24 h and over 60 MPa at 28 days. Even at 40 % PG, compressive strength exceeded 27 MPa. The Le Chatelier expansion remained below 1.5 mm across all groups, and softening coefficients above 0.9 confirmed excellent water resistance. Microstructural results showed that carbonation transformed C<sub>3</sub>S/C<sub>2</sub>S into CaCO<sub>3</sub> and silica gel, forming a dense, stable matrix that encapsulated PG and suppressed sulfate leaching. Subsequent hydration refined the pore structure and restored reactivity via C–S–H growth. This study demonstrates that CPHS effectively mitigates delayed ettringite formation and performance deterioration at high PG contents, offering a practical solution for the safe, durable, and carbon-efficient use of PG in cementitious materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107978"},"PeriodicalIF":10.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572491","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}

引用次数: 0

Exploration of the fracture mechanism of UHPFRC by acoustic emission, DIC and magnetoscopy testing 通过声发射、DIC和磁镜检测探讨UHPFRC的断裂机理

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-07 DOI: 10.1016/j.cemconres.2025.107984

Imane Bayane , Jian Zhan , Eugen Brühwiler

{"title":"Exploration of the fracture mechanism of UHPFRC by acoustic emission, DIC and magnetoscopy testing","authors":"Imane Bayane , Jian Zhan , Eugen Brühwiler","doi":"10.1016/j.cemconres.2025.107984","DOIUrl":"10.1016/j.cemconres.2025.107984","url":null,"abstract":"<div><div>This paper investigates the fracture mechanism of ultra-high-performance fiber-reinforced cementitious composites (UHPFRC) using acoustic emission (AE), digital image correlation (DIC), and magnetoscopy testing. Four specimens undergo uniaxial tensile loading, preceded by magnetoscopy testing to determine local fiber volume and orientation. DIC captures matrix discontinuities, crack initiation, and propagation. Acoustic emission monitors fracture mechanisms at different loading phases. During the elastic phase, matrix discontinuities and fiber debonding are observed to occur. A higher density of matrix discontinuities during this phase enhances hardening behavior and tensile performance. The softening phase of UHPFRC is found to be characterized by three stages based on AE parameters: emergence and competition of multiple fictitious cracks, propagation of a dominant fictitious crack, and real crack formation. The rate of dominant fictitious crack propagation can be determined by analyzing the evolution in AE parameters with stress decrease. Uniform fiber distribution limits the initiation and propagation of fictitious cracks.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107984"},"PeriodicalIF":10.9,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572492","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}

引用次数: 0

Water vapor sorption of cement pastes altered by temperature and carbonation 水泥浆的水蒸气吸收随温度和碳化作用的变化

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-05 DOI: 10.1016/j.cemconres.2025.107972

Zhen Wang, Kefei Li

引用次数: 0

Development of in-situ highly active calcium carbonate through anhydrous carbonation of OPC: Effect on hydration and properties of cement composites OPC无水碳化制备原位高活性碳酸钙：对水泥复合材料水化及性能的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-04 DOI: 10.1016/j.cemconres.2025.107980

Kai Cui , Yong Zheng , Yingliang Zhao , Qinglong Qin , Kaikang Liang , Jun Chang , Faqian Liu , Peiliang Shen , Chi Sun Poon

{"title":"Development of in-situ highly active calcium carbonate through anhydrous carbonation of OPC: Effect on hydration and properties of cement composites","authors":"Kai Cui , Yong Zheng , Yingliang Zhao , Qinglong Qin , Kaikang Liang , Jun Chang , Faqian Liu , Peiliang Shen , Chi Sun Poon","doi":"10.1016/j.cemconres.2025.107980","DOIUrl":"10.1016/j.cemconres.2025.107980","url":null,"abstract":"<div><div>Cement production generates a significant amount of CO<sub>2</sub>. This paper presents a novel technique requesting CO<sub>2</sub> capture during cement production, namely anhydrous carbonation (AC). By introducing CO<sub>2</sub> during the grinding stage of cement production, which involves mechanochemical effects, this method enhances the carbonation of cement to produce carbon-enriched cement. The results indicated that calcium carbonate was formed in situ on the surface of cement after AC. Compared with the Ref samples, at curing of 1d, the compressive strength of AC-30 min, AC-1 h, and AC-3 h samples increased by 18.1 %, 40.0 %, and 22.9 %, respectively, the 28-day compressive strength increased by 7.5 %,17.1 %, and 12.3 %, respectively. AC facilitated the dissolution of OPC clinkers and the subsequent precipitation of hydration products. The enhancement of OPC performance after AC is primarily attributed to several factors. First, highly active calcium carbonate was generated on the surface of the cement clinker, providing nucleation sites for the hydration products of OPC. Additionally, this calcium carbonate participated in chemical reactions, reacted with C<sub>3</sub>A during hydration and formed Mc and Hc. Furthermore, the filling effect of unreacted calcium carbonate, combined with the formation of hydration products such as AFm, C-S-H, AFt, Mc, and Hc, contributed to the refinement of the pore structure. This research indicated that 14.4 kg of CO<sub>2</sub> could be captured for every ton of cement produced, which suggests that anhydrous carbonation holds substantial potential for CO<sub>2</sub> sequestration during the cement production process, which could significantly contribute to reducing CO<sub>2</sub> emissions in the industrial production of cement.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107980"},"PeriodicalIF":10.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549224","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}

引用次数: 0

Inhibition mechanism of MgO on ettringite formation in GGBS binder with inherent, internal, and external sulphates MgO对GGBS粘结剂中钙矾石形成的抑制机理及其内在、内在和外在硫酸盐

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-07-04 DOI: 10.1016/j.cemconres.2025.107981

Matthew Zhi Yeon Ting, Bo Xu, Mingqian Yang, Yaolin Yi

{"title":"Inhibition mechanism of MgO on ettringite formation in GGBS binder with inherent, internal, and external sulphates","authors":"Matthew Zhi Yeon Ting, Bo Xu, Mingqian Yang, Yaolin Yi","doi":"10.1016/j.cemconres.2025.107981","DOIUrl":"10.1016/j.cemconres.2025.107981","url":null,"abstract":"<div><div>Excessive ettringite formation degrades cementitious binders. Ground granulated blastfurnace slag (GGBS) can alleviate the damage, but ettringite development remains inevitable in sulphate-rich environments. This study explores MgO to suppress ettringite formation in GGBS. Ettringite content, evolution, and characteristics were evaluated in MgO-GGBS with inherent, internal, and external sulphates, and compared to GGBS and CaO-GGBS. To simulate internal sulphate, 1 %–5 % Na<sub>2</sub>SO<sub>4</sub> was introduced before hydration; for external sulphate, hardened specimens were immersed in 5 % Na<sub>2</sub>SO<sub>4</sub> solution. With inherent sulphate, GGBS formed ettringite within 0.5 h; CaO-GGBS gradually converted ettringite to monosulfate, whereas MgO-GGBS inhibited ettringite by 60 %–80 %. 1 %–5 % internal sulphate increased ettringite in CaO-GGBS since monosulfate was transitioned to ettringite, whereas MgO-GGBS showed 45 %–85 % less ettringite. Under external sulphate, MgO-GGBS produced 62 %–72 % less ettringite. This was attributed to Al-immobilizing phases and low Mg(OH)<sub>2</sub> solubility; hydrotalcite in MgO-GGBS intercalated sulphate. This study indicates MgO-GGBS as promising binders for sulphate-rich environments.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107981"},"PeriodicalIF":10.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549225","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}

引用次数: 0