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α/β-TCP silicate glass-ceramic obtained by sol–gel: Structure and in vitro bioactivity 通过溶胶-凝胶法获得的 α/β-TCP 硅酸盐玻璃陶瓷:结构和体外生物活性
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.04.002
A glass-ceramic in the CaO–P2O5–SiO2 system, which contains two polymorphic modifications of tricalcium phosphate – whitlockite, β-Ca3(PO4)2 and α-Ca3(PO4)2, has been synthesized by the sol–gel method and thermal treatment up to 1200 °C. The phase composition and microstructure of the glass-ceramic were investigated with X-ray diffraction analysis (XRD), Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS). An in vitro bioactivity test of the glass-ceramic in a simulated body fluid (SBF) was conducted for up to 21 days. α-Ca3(PO4) dissolved almost completely in SBF after 7 days. The experimental results of XRD, FTIR, SEM and EDS clearly validated the ability of the glass-ceramic samples to form a layer of hydroxyapatite on their surface in an SBF environment. We also studied the cytotoxic effect of the glass-ceramic on murine bone marrow (BM) cells and pre-osteoclasts in vitro. The glass-ceramic reduced the viability of BM cells in a dose-dependent manner being less toxic at concentrations below 0.1 mg/ml. It modestly affected the viability of pre-osteoclasts cultured in osteoclast differentiation media. The obtained sample increased the percentage of pre-osteoclasts expressing the receptors involved in osteoclastogenesis (RANK) and apoptosis (TRAIL). In conclusion, the glass-ceramic showed the potential to affect the survival/differentiation of pre-osteoclasts at early stage of osteoclastogenesis. It might be suitable for tissue engineering including implants coating or scaffold as it can interfere with early stage of osteoclastogenesis which is required for proper bone remodelling and repair upon a long-term application of biomaterials.
通过溶胶-凝胶法合成了一种 CaO-P2O5-SiO2 系的玻璃陶瓷,其中包含磷酸三钙的两种多晶型变体--白锁石、β-Ca3(PO4)2 和 α-Ca3(PO4)2,热处理温度高达 1200 °C。利用 X 射线衍射分析(XRD)、傅立叶变换红外光谱(FTIR)、扫描电子显微镜和能量色散光谱(SEM-EDS)对玻璃陶瓷的相组成和微观结构进行了研究。在模拟体液(SBF)中对玻璃陶瓷进行了长达 21 天的体外生物活性测试,7 天后,α-Ca3(PO4) 几乎完全溶解在 SBF 中。XRD、傅立叶变换红外光谱、扫描电镜和 EDS 的实验结果清楚地验证了玻璃陶瓷样品在 SBF 环境中能够在其表面形成一层羟基磷灰石。我们还在体外研究了玻璃陶瓷对小鼠骨髓(BM)细胞和前破骨细胞的细胞毒性作用。玻璃陶瓷以剂量依赖的方式降低了骨髓细胞的活力,当浓度低于 0.1 毫克/毫升时,玻璃陶瓷的毒性较低。它对在破骨细胞分化培养基中培养的前破骨细胞的活力影响不大。获得的样品增加了表达破骨细胞生成受体(RANK)和凋亡受体(TRAIL)的前破骨细胞的百分比。总之,在破骨细胞生成的早期阶段,玻璃陶瓷显示出影响前破骨细胞存活/分化的潜力。它可能适用于包括植入物涂层或支架在内的组织工程,因为它可以干扰破骨细胞生成的早期阶段,而破骨细胞生成是生物材料长期应用后进行适当骨重塑和修复所必需的。
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引用次数: 0
Synthesis and characterization of B-type carbonated hydroxyapatite materials: Effect of carbonate content on mechanical strength and in vitro degradation B 型碳化羟基磷灰石材料的合成与表征:碳酸盐含量对机械强度和体外降解的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2023.12.001
Hamilton Copete , Esperanza López , Carmen Baudin

The current approach in bone tissue engineering requires resorbable biomaterials that enhance bone formation while maintaining sufficient mechanical stability. In this work, the influence of three levels of B-type carbonate substitution in hydroxyapatite lattice on mechanical strength and degradation rate is analyzed. The inverse aqueous route has been selected as a synthesis method of four powders with carbonate substitution between 4 and 6 wt.%. X-ray fluorescence (XRF), (C-S)-Analysis, FT-Infrared, X-ray diffraction, DTA-TG and TEM were used to investigate chemical composition, type of substitution, thermal behaviour, and morphology of the powders. Disc shaped specimens were processed by uniaxial pressing and sintering in argon/CO2 flow. Maximum temperatures of thermal treatment between 750 and 850 °C were selected to obtain similar porosity levels for the different compositions. The highest carbonate substituted material (5.3 wt.%) presented higher compressive strength and dissolution rate than the other materials showing the beneficial effect of B-type substitution in hydroxyapatite materials for bone repair.

目前的骨组织工程方法要求可吸收生物材料既能促进骨形成,又能保持足够的机械稳定性。本研究分析了羟基磷灰石晶格中三种程度的 B 型碳酸盐取代对机械强度和降解率的影响。四种碳酸盐取代度介于 4 至 6 wt.% 之间的粉末的合成方法均选择了反向水溶液路线。利用 X 射线荧光 (XRF)、(C-S)分析、傅立叶变换红外光谱、X 射线衍射、DTA-TG 和 TEM 来研究粉末的化学成分、替代类型、热性能和形态。圆盘状试样在氩气/二氧化碳气流中进行单轴压制和烧结处理。热处理的最高温度选择在 750 至 850 ℃ 之间,以获得不同成分的相似孔隙率水平。碳酸盐取代度最高的材料(5.3 wt.%)比其他材料具有更高的抗压强度和溶解率,这表明羟基磷灰石材料中的 B 型取代对骨修复具有有利影响。
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引用次数: 0
Actualización de los datos bibliométricos de la revista 更新期刊的文献计量数据
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.07.005
Amador C. Caballero
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引用次数: 0
Análisis de la transformación del caolín de Hidalgo en zeolita cancrinita y fases secundarias por el método hidrotermal 利用水热法分析伊达尔戈高岭土向方解石沸石和次生相的转化过程
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.02.002

This study investigated the transformation of cancrinite-type zeolite, together with secondary phases, in a hydrothermal system. The mineral kaolin and NaOH were used as precursors under self-generated pressure at 140 °C, varying the reaction time at intervals of 0 to 10 hours. The kaolin, the main precursor, was subjected to X-ray diffraction (XRD), elemental chemical composition (XRF) and Fourier Transform IR Spectroscopy (FT-IR) analyses. The resulting solids were characterized by XRD. Initially, crystalline phases such as Na-P2 zeolites, gismondine, analcime, natrolite and sodalite were formed, but with time they became unstable and dissolved to form new phases. At 8 hours of reaction, the cancrinite zeolite predominated, fulfilling the main objective of the study. The solid material was analyzed by scanning electron microscopy (SEM) and FT-IR. The behavior of Na, Si and Al in the solutions was evaluated over time by inductre coupled plasma (ICP). It was conclusively demonstrated that kaolin from Hidalgo is a feasible precursor to synthesize zeolites, cancrinite type as predominant phase in 8 hours at 140 °C, using moderate concentrations of NaOH.

本研究探讨了在水热系统中,方解石型沸石连同次生相的转化过程。以矿物高岭土和 NaOH 为前驱体,在 140 ℃ 的自生压力下进行反应,每隔 0 到 10 小时改变一次反应时间。对主要前驱体高岭土进行了 X 射线衍射(XRD)、元素化学成分(XRF)和傅立叶变换红外光谱(FT-IR)分析。X 射线衍射对所得到的固体进行了表征。最初形成的结晶相包括 Na-P2 沸石、吉斯蒙德石、芒硝、钠长石和钠长石,但随着时间的推移,这些结晶相变得不稳定,并溶解形成新的结晶相。反应 8 小时后,主要形成的是康氏沸石,达到了研究的主要目的。固体材料通过扫描电子显微镜(SEM)和傅立叶变换红外光谱(FT-IR)进行了分析。通过电感耦合等离子体 (ICP) 评估了溶液中 Na、Si 和 Al 随时间的变化情况。最终结果表明,伊达尔戈的高岭土是一种可行的前驱体,使用中等浓度的 NaOH,在 140 ℃ 下 8 小时内就能合成沸石,主要相为针状沸石。
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引用次数: 0
Effect of graphene oxide on the hydration process and macro-mechanical properties of cement 氧化石墨烯对水泥水化过程和宏观力学性能的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.03.001

The impact of graphene oxide (GO) on the hydration process, calcium silicate hydrate (CSH) gels structure, and macro-mechanical properties were systematically researched by combinatorial techniques. Findings from 29Si MAS-NMR and nitrogen adsorption (BET) revealed that the effect of GO on the hydration degree of the cement paste, and the main chain length (MCL) is more pronounced at advanced ages (from 28 days), due to its act as a nucleation site. Moreover, the results of Raman spectroscopy tests showed that GO has a strong interaction with the cement matrix. Due to the increase in the degree of hydration, the lengthening of the chain length (MCL), and the formation of strong bonds, both compressive and flexural strength tests also improved. Therefore, the effect of GO as a nucleation site has a positive effect on the cement paste nano-properties at advanced ages.

通过组合技术系统研究了氧化石墨烯(GO)对水化过程、硅酸钙水合物(CSH)凝胶结构和宏观力学性能的影响。29Si MAS-NMR 和氮吸附(BET)的研究结果表明,GO 对水泥浆水化程度和主链长度(MCL)的影响在高龄期(28 天以上)更为明显,这是因为它起到了成核作用。此外,拉曼光谱测试结果表明,GO 与水泥基质有很强的相互作用。由于水化程度的增加、链长(MCL)的延长以及强键的形成,抗压和抗折强度测试也得到了改善。因此,GO 作为成核位点对水泥浆在高龄期的纳米性能有积极影响。
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引用次数: 0
Interzeolite conversion of a clinoptilolite-rich natural zeolite into merlinoite 将富含黝帘石的天然沸石转化为梅里诺石的沸石间转化过程
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.04.001

The use of natural zeolites as precursors offers a valuable alternative in the search for new materials applied to zeolite synthesis. Each study focused on the interzeolitic conversion method plays a fundamental role in understanding the evolution from one zeolite to another. In this study, a natural zeolite containing the crystalline phases of clinoptilolite and mordenite, with HEU and MOR topologies, respectively, as per the coding assigned by the IZA, was employed as a precursor. Combined with potassium–aluminum hydroxide solutions at two different concentrations, followed by a conventional hydrothermal process with durations of 50 and 90 h, characterization of both the precursor and resulting zeolite was performed. A conversion mechanism was proposed based on the structural similarity between the initial and target zeolites. To support these conclusions, characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, Fourier-transform infrared spectroscopy, inductively coupled plasma optical emission spectroscopy, and nitrogen adsorption were utilized. This process represents a potential pathway for the synthesis of merlinoite-type zeolites, MER.

使用天然沸石作为前驱体为寻找用于沸石合成的新材料提供了宝贵的选择。每项侧重于沸石间转化方法的研究在了解从一种沸石到另一种沸石的演变过程中都发挥着重要作用。在本研究中,采用了一种天然沸石作为前驱体,该沸石含有clinoptilolite和mordenite的结晶相,根据国际沸石协会的编码,分别具有HEU和MOR拓扑结构。结合两种不同浓度的氢氧化钾-铝溶液,再经过 50 和 90 小时的传统水热过程,对前驱体和生成的沸石进行了表征。根据初始沸石和目标沸石之间的结构相似性,提出了一种转换机制。为了支持这些结论,我们使用了 X 射线衍射、扫描电子显微镜、能量色散 X 射线光谱、傅立叶变换红外光谱、电感耦合等离子体光发射光谱和氮吸附等表征技术。这一过程是合成梅里诺石型沸石、MER 的潜在途径。
{"title":"Interzeolite conversion of a clinoptilolite-rich natural zeolite into merlinoite","authors":"","doi":"10.1016/j.bsecv.2024.04.001","DOIUrl":"10.1016/j.bsecv.2024.04.001","url":null,"abstract":"<div><p>The use of natural zeolites as precursors offers a valuable alternative in the search for new materials applied to zeolite synthesis. Each study focused on the interzeolitic conversion method plays a fundamental role in understanding the evolution from one zeolite to another. In this study, a natural zeolite containing the crystalline phases of clinoptilolite and mordenite, with HEU and MOR topologies, respectively, as per the coding assigned by the IZA, was employed as a precursor. Combined with potassium–aluminum hydroxide solutions at two different concentrations, followed by a conventional hydrothermal process with durations of 50 and 90<!--> <!-->h, characterization of both the precursor and resulting zeolite was performed. A conversion mechanism was proposed based on the structural similarity between the initial and target zeolites. To support these conclusions, characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, Fourier-transform infrared spectroscopy, inductively coupled plasma optical emission spectroscopy, and nitrogen adsorption were utilized. This process represents a potential pathway for the synthesis of merlinoite-type zeolites, MER.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 279-293"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317524000062/pdfft?md5=da1a8a0d5353cc725b1331df04fdbff7&pid=1-s2.0-S0366317524000062-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of initial curing conditions on the durability performance of low-calcium fly ash-based geopolymer mortars 初始固化条件对低钙粉煤灰基土工聚合物砂浆耐久性能的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2023.10.006
Arın Yılmaz , Fatma Nurhayat Degirmenci , Yurdakul Aygörmez

Geopolymer composite production has become an indispensable product to reduce carbon dioxide emissions, which have become an important problem today, and to provide green sustainability. Concerns about the global climate change problem have also accelerated geopolymer studies. This research investigated the mechanical and durability characteristics of low-calcium fly ash (LCFA) based geopolymer mortars with different curing temperatures and times. Two forms of curing conditions were applied; the first one was standard curing at room temperature (20 ± 3 °C and RH 65 ± 10%) and the second one was cured in the hot air at 40 °C, 60 °C, and 80 °C for 24 h, 48 h, and 72 h followed by standard curing. After all curing processes, compressive strength, flexural strength, water absorption, void ratio, resistance to elevated temperatures, and freeze–thaw conditions were determined experimentally. In addition, SEM analysis was performed before and after durability tests for comparison purposes. Also, XRD and TGA analyzes were performed. According to test results, curing specimens at longer times and higher temperatures has been shown to increase compressive strength results. The highest compressive strength value was reached at 80 °C after 72 h of curing. Geopolymer specimens subjected to elevated temperatures (600 °C and 900 °C) lost a significant part of their strength value. After the freeze–thaw test, LCFA-based geopolymer specimens showed more than 70% resistance. The freeze–thaw resistance of geopolymer samples was positively affected on long-term curing at high temperatures, but high-temperature resistance was impacted negatively.

土工聚合物复合材料生产已成为减少二氧化碳排放(这已成为当今的一个重要问题)和实现绿色可持续发展不可或缺的产品。对全球气候变化问题的关注也加速了对土工聚合物的研究。本研究调查了以低钙粉煤灰(LCFA)为基础的土工聚合物砂浆在不同固化温度和时间下的机械性能和耐久性能。研究采用了两种固化条件:第一种是室温(20 ± 3 °C,相对湿度 65 ± 10%)下的标准固化,第二种是在 40 °C、60 °C 和 80 °C 的热空气中分别固化 24 小时、48 小时和 72 小时,然后再进行标准固化。所有固化过程结束后,通过实验测定了抗压强度、抗弯强度、吸水率、空隙率、耐高温性和耐冻融性。此外,还对耐久性试验前后的材料进行了扫描电镜分析,以进行比较。此外,还进行了 XRD 和 TGA 分析。测试结果表明,在更长的时间和更高的温度下固化试样可提高抗压强度。在 80 °C 下固化 72 小时后,抗压强度达到最高值。在高温(600 °C 和 900 °C)条件下的土工聚合物试样会损失很大一部分强度值。冻融试验后,基于 LCFA 的土工聚合物试样显示出 70% 以上的抗冻融性。土工聚合物试样的抗冻融性在高温下长期固化后会受到积极影响,但抗高温性则会受到消极影响。
{"title":"Effect of initial curing conditions on the durability performance of low-calcium fly ash-based geopolymer mortars","authors":"Arın Yılmaz ,&nbsp;Fatma Nurhayat Degirmenci ,&nbsp;Yurdakul Aygörmez","doi":"10.1016/j.bsecv.2023.10.006","DOIUrl":"10.1016/j.bsecv.2023.10.006","url":null,"abstract":"<div><p>Geopolymer composite production has become an indispensable product to reduce carbon dioxide emissions, which have become an important problem today, and to provide green sustainability. Concerns about the global climate change problem have also accelerated geopolymer studies. This research investigated the mechanical and durability characteristics of low-calcium fly ash (LCFA) based geopolymer mortars with different curing temperatures and times. Two forms of curing conditions were applied; the first one was standard curing at room temperature (20<!--> <!-->±<!--> <!-->3<!--> <!-->°C and RH 65<!--> <!-->±<!--> <!-->10%) and the second one was cured in the hot air at 40<!--> <!-->°C, 60<!--> <!-->°C, and 80<!--> <!-->°C for 24<!--> <!-->h, 48<!--> <!-->h, and 72<!--> <!-->h followed by standard curing. After all curing processes, compressive strength, flexural strength, water absorption, void ratio, resistance to elevated temperatures, and freeze–thaw conditions were determined experimentally. In addition, SEM analysis was performed before and after durability tests for comparison purposes. Also, XRD and TGA analyzes were performed. According to test results, curing specimens at longer times and higher temperatures has been shown to increase compressive strength results. The highest compressive strength value was reached at 80<!--> <!-->°C after 72<!--> <!-->h of curing. Geopolymer specimens subjected to elevated temperatures (600<!--> <!-->°C and 900<!--> <!-->°C) lost a significant part of their strength value. After the freeze–thaw test, LCFA-based geopolymer specimens showed more than 70% resistance. The freeze–thaw resistance of geopolymer samples was positively affected on long-term curing at high temperatures, but high-temperature resistance was impacted negatively.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 238-254"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317523000523/pdfft?md5=5a985d7d8a994c46843eba0a2ffbbaa4&pid=1-s2.0-S0366317523000523-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Ta2O5 content on the microstructural properties of 45S5 bioglass glass-ceramic scaffolds Ta2O5 含量对 45S5 生物玻璃陶瓷支架微观结构特性的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.04.004

Bioactive glasses are mainly used to repair bone defects since they stimulate the natural healing of damaged tissues, allowing the adhesion and proliferation of bone-forming cells. On the other hand, tantalum is known to have good chemical resistance and biocompatibility, with no adverse biological response in organisms. In the present work, 45S5 bioglass systems undoped and doped with Ta2O5 were prepared according to the following stoichiometric molar relationship (46  x)SiO2  26.9CaO  24.4Na2O  2.6P2O5  xTa2O5 (x = 0, 0.1, 0.5) by the conventional melt quenching technique. Subsequently, scaffolds from these glassy systems were prepared using the combined method of powder technology and polymer foaming. Both, glass powders and scaffolds, were physicochemical characterized. The results showed that the 0.5 mol% Ta2O5-doped scaffolds exhibited less contraction (36.53%) and higher porosity (84.24%) during sintering, with interconnected porosity, pore size in the range of 19–260 μm, and a greater surface area (17.431 ± 0.846 m2/g) than the scaffolds with no Ta2O5. Furthermore, the tantalum oxide promoted the formation of a sodium tantalum phosphate phase, along with the combeite and silicorhenanite present in the undoped-glass scaffolds. The maximum compressive strength of scaffolds ranged from 0.42 to 1.40 MPa and the elastic modulus (E) from 0.19 to 0.47 GPa.

生物活性玻璃主要用于修复骨缺损,因为它们能刺激受损组织的自然愈合,使骨形成细胞得以粘附和增殖。另一方面,众所周知,钽具有良好的耐化学性和生物相容性,不会对生物体产生不良的生物反应。本研究采用传统的熔体淬火技术,按照以下化学计量摩尔关系制备了未掺杂和掺杂 Ta2O5 的 45S5 生物玻璃系统:(46 - x)SiO2 - 26.9CaO - 24.4Na2O - 2.6P2O5 - xTa2O5(x = 0、0.1、0.5)。随后,采用粉末技术和聚合物发泡相结合的方法制备了这些玻璃体系的支架。对玻璃粉和支架都进行了物理化学表征。结果表明,与不掺杂 Ta2O5 的支架相比,掺杂 0.5 mol% Ta2O5 的支架在烧结过程中表现出更小的收缩率(36.53%)和更高的孔隙率(84.24%),孔隙率相互连接,孔径范围为 19-260 μm,表面积更大(17.431 ± 0.846 m2/g)。此外,氧化钽促进了磷酸钽钠相的形成,同时也促进了未掺杂玻璃支架中存在的泡沸石和硅硼酸盐相的形成。支架的最大抗压强度为 0.42 至 1.40 兆帕,弹性模量(E)为 0.19 至 0.47 千兆帕。
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引用次数: 0
Application of digital image processing to mortar crack analysis 数字图像处理在砂浆裂缝分析中的应用
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.10.004
Gracia López-Pérez , Juan Luis Pérez-Bernal , Vicente Flores-Alés , Juan Jesús Martín-del-Río , Mercedes Borreguero , Juan Manuel Alducin-Ochoa

Image analysis techniques can be used to detect and interpret the degradation processes that a material undergoes and to help identify the causes and mechanisms of degradation. Structures and morphological changes are also analysed to establish hypotheses about physical changes. Together with complementary analytical techniques, chemical and mineralogical changes can be evaluated.

The methodological process consists of a sequential simplification of the initial micrograph: segmentation of the image, cleaning and isolation of the crack from associated elements, and crack skeletonisation. This method allows the previous image to be processed, thus successfully isolating the microcracks. It is also valid for their quantification.

图像分析技术可用于检测和解释材料的降解过程,并帮助确定降解的原因和机制。此外,还可以通过分析结构和形态变化来建立物理变化假设。该方法包括对初始显微照片进行连续简化:分割图像、清理裂纹并将其从相关元素中分离出来,以及裂纹骨架化。这种方法可以对前一幅图像进行处理,从而成功地分离出微裂缝。这种方法也适用于对微裂纹进行量化。
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引用次数: 0
Mechanical and durability performance of polyvinyl alcohol fiber hybrid geopolymer-portland cement concrete under freeze–thaw cycles 聚乙烯醇纤维混合土工聚合物-波特兰水泥混凝土在冻融循环下的机械性能和耐久性能
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.10.005
Mingming Zhang , Nan Zhao , Sheliang Wang , Xiaoyi Quan , Kangning Liu , Jin Xu , Zhaoyao Wang , Honghao Ying , Bo Liu

Cold winter temperatures at high latitudes in coastal regions lead to prolonged exposure of offshore concrete structures to freeze–thaw (F–T) damage, which significantly reduces the mechanical and durability properties of concrete. To improve the durability of concrete under F–T damage, this study investigated the combined effects of fly ash (FA) and bentonite on the frost resistance of polyvinyl alcohol fiber reinforced geopolymer concrete (PFRGC). The study comprehensively analyzed the effect of fly ash and bentonite content on the rate of mass change and compressive strength under various F–T damage conditions. In addition, uniaxial compressive tests were carried out at different stages of F–T damage and the resulting stress–strain curves and compressive properties were analyzed. Correlations between peak stress, peak strain, modulus of elasticity and deterioration time of the concrete were developed. SEM microscopy tests were also used to investigate the evolution of the internal microstructure and the morphological characteristics of the erosion products under freeze–thaw conditions. The results indicated that the change in concrete mass with a growing number of F–T cycles can be divided into two periods: a gentle increase and a faster increase. A continuous increase in the rate of mass increase was observed for the specimens containing fly ash and bentonite, while the compressive strength of these specimens continued to decrease. During F–T damage, the maximum stress decreased slightly and the maximum strain increased gradually as the volume of bentonite and fly ash increased. This study provides a theoretical basis and technical basis for the development of fly ash and bentonite to improve the frost durability of offshore structures.

沿海地区高纬度地区冬季气温寒冷,导致近海混凝土结构长期暴露于冻融(F-T)破坏中,从而大大降低了混凝土的力学性能和耐久性能。为了提高混凝土在冻融破坏下的耐久性,本研究调查了粉煤灰(FA)和膨润土对聚乙烯醇纤维增强土工聚合物混凝土(PFRGC)抗冻性的综合影响。研究全面分析了粉煤灰和膨润土含量对各种 F-T 破坏条件下质量变化率和抗压强度的影响。此外,还在 F-T 破坏的不同阶段进行了单轴抗压试验,并分析了由此产生的应力-应变曲线和抗压性能。分析了混凝土的峰值应力、峰值应变、弹性模量和劣化时间之间的相关性。此外,还利用扫描电镜显微测试研究了冻融条件下内部微观结构的演变和侵蚀产物的形态特征。结果表明,随着冻融循环次数的增加,混凝土质量的变化可分为两个时期:平缓增加期和快速增加期。含有粉煤灰和膨润土的试样的质量增加率持续上升,而这些试样的抗压强度却持续下降。在 F-T 破坏过程中,随着膨润土和粉煤灰体积的增加,最大应力略有下降,最大应变逐渐增加。这项研究为开发粉煤灰和膨润土以提高海上结构的抗冻耐久性提供了理论依据和技术基础。
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引用次数: 0
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