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Leveraging incinerator bottom ash for mitigating early age shrinkage in 3D printed engineered cementitious composites 利用焚化炉底灰减轻 3D 打印工程水泥基复合材料的早期龄期收缩
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-14 DOI: 10.1016/j.cemconcomp.2025.105933
Jie Yu , Fengming Xu , Hanghua Zhang , Junhong Ye , Jiangtao Yu , Jian-Guo Dai , Yiwei Weng
This study investigates the use of incinerator bottom ash (IBA) as a supplementary cementitious material to mitigate early age shrinkage in 3D printed engineered cementitious composites (3DP-ECC). IBA was processed through milling and thermal treatment before incorporation into 3DP-ECC. The fresh and hardened properties, hydration kinetics and products, early age shrinkage, and microstructural characteristics of 3DP-ECC with IBA were evaluated. Results indicate that pre-treated IBA reduces autogenous shrinkage and plastic shrinkage by 56 % and 30 %, respectively. The substitution of IBA increases the volume fraction of macropores (>1000 nm) of 3DP-ECC at 3 days and 7 days by approximately 300 % and 500 %, respectively, alleviating early age shrinkage. Sustainability analysis reveals that the incorporation of IBA can reduce the normalized embodied energy and carbon footprint of 3DP-ECC by over 17 %. These findings provide a promising approach to utilizing waste materials in mitigating early age shrinkage in 3DP-ECC towards sustainable digital construction.
本研究调查了焚化炉底灰(IBA)作为补充胶凝材料的使用情况,以减轻三维打印工程胶凝复合材料(3DP-ECC)的早期龄期收缩。在将焚烧炉底灰加入 3DP-ECC 之前,先对其进行研磨和热处理。评估了含有 IBA 的 3DP-ECC 的新鲜和硬化性能、水化动力学和产物、早期龄期收缩以及微观结构特征。结果表明,预处理 IBA 可使自生收缩率和塑性收缩率分别降低 56% 和 30%。取代 IBA 后,3DP-ECC 在 3 天和 7 天时的大孔体积分数(1000 nm)分别增加了约 300 % 和 500 %,从而缓解了早期龄期收缩。可持续性分析表明,加入 IBA 可使 3DP-ECC 的归一化内含能源和碳足迹减少 17% 以上。这些研究结果为利用废弃材料缓解 3DP-ECC 早期收缩提供了一种可行的方法,从而实现可持续的数字建筑。
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引用次数: 0
Sustainable geopolymer synthesis catalyzed by hexafluorosilicic acid: A low-energy approach using phosphate industrial waste 六氟硅酸催化可持续地聚合物合成:利用磷酸盐工业废料的低能耗途径
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-11 DOI: 10.1016/j.cemconcomp.2025.105934
H. Majdoubi , Y. Haddaji , M. Nadi , H. Hamdane , S. Mansouri , R. Boulif , Y. Samih , M. Oumam , B. Manoun , J. Alami , Y. Tamraoui , H. Hannache
This study investigates the utilization of hexafluorosilicic acid (AFS), a by-product of the phosphate industry with negative environmental impacts, as a catalyst in the synthesis of acid-based geopolymers at room temperature. Specifically, the research focuses on the acceleration of the acid geopolymerization reaction to produce phosphoric acid-based geopolymers and examines the influence of varying AFS concentrations on the geopolymerization process, microstructural properties, and mechanical strength. The experimental approach includes quasi-isothermal DSC analysis, temperature monitoring of geopolymer paste over time, vicat automatic tests, compressive strength, FTIR, DRX, SEM, and EDX. Results indicate that geopolymers prepared without AFS remained unconsolidated even after three days at room temperature. In contrast, adding AFS reduced the setting time to as little as 18 min with 7 % AFS by weight of the paste, demonstrating a significant reduction in setting time from several days to few minutes. Isothermal DSC and internal temperature monitoring of the geopolymer paste during setting revealed that minimal AFS additions (1%–5%) effectively accelerate the geopolymerization kinetics by catalyzing the highly exothermic second step, thus enhancing the subsequent steps of geopolymerization. However, precise control of AFS concentration is crucial, as insufficient amounts do not fully catalyze the reaction, while excessive AFS causes a rapid temperature rise (up to 108 °C in less than 10 min), hindering the initial dissolution step and leading to incomplete aluminosilicate source dissolution. Compressive strength tests showed that adding 5 % AFS at room temperature increased strength by 87 % compared to samples without AFS, which required 60 °C for 14 MPa. However, strength decreased with AFS concentrations above 5 %. After 28 days, a 25 % increase in strength was observed compared to 7-day samples, highlighting that most strength development occurs within the first 7 days, while microstructural analyses confirmed that AFS serves as a catalyst without altering the crystal phase or the geopolymer network. This study underscores the potential of AFS to significantly enhance the performance of acid-based geopolymers, providing a sustainable approach to utilizing an industrial by-product while improving material properties.
本文研究了六氟硅酸(AFS)作为催化剂在室温下合成酸基地聚合物的应用。六氟硅酸是磷酸盐工业的副产物,对环境有负面影响。具体而言,研究重点是加速酸性地聚合反应以生产磷酸基地聚合物,并研究不同AFS浓度对地聚合过程、微观结构性能和机械强度的影响。实验方法包括准等温DSC分析,地聚合物膏体随时间的温度监测,vicat自动测试,抗压强度,FTIR, DRX, SEM和EDX。结果表明,不加AFS制备的地聚合物在室温下放置3天后仍未固结。相比之下,添加AFS时,膏体的凝固时间缩短至18分钟,AFS占膏体重量的7%,表明凝固时间从几天缩短到几分钟。等温DSC和内部温度监测表明,少量AFS(1%-5%)通过催化高放热的第二步,有效地加速了地聚合动力学,从而增强了后续步骤的地聚合。然而,精确控制AFS浓度是至关重要的,因为不足的AFS不能完全催化反应,而过量的AFS会导致温度迅速上升(在不到10分钟的时间内高达108°C),阻碍了初始溶解步骤,导致铝硅酸盐源溶解不完全。抗压强度试验表明,在室温下添加5% AFS的样品,与不添加AFS的样品相比,强度提高了87%,AFS需要60℃,温度为14 MPa。AFS浓度超过5%,强度下降。28天后,与7天的样品相比,观察到强度增加了25%,突出表明大多数强度发展发生在前7天,而微观结构分析证实AFS作为催化剂,不会改变晶体相或地聚合物网络。这项研究强调了AFS在显著提高酸基地聚合物性能方面的潜力,为利用工业副产品同时改善材料性能提供了一种可持续的方法。
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引用次数: 0
Developing high-strength dry-cast pastes by incorporating carbonatable chlorellestadite 采用可碳化小球藻制备高强度干铸浆料
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-10 DOI: 10.1016/j.cemconcomp.2025.105935
Hanxiong Lyu, Shipeng Zhang, Chi Sun Poon
A water-insoluble mineral, chlorellestadite (CE, Ca10(SiO4)3(SO4)3Cl2), would be formed in the preheater coatings of cement kilns when using chlorine-containing plastics as alternative fuels. This work investigated the viability of employing CE as an SCM to enhance the utilization of chlorine-containing fuels in cement-making. Substituting 20 wt% CE in dry-cast pastes (CE20), which were prepared by compaction method with zero workability, exhibited decreased compressive strength after 1d carbonation curing because of reduced cement content. However, carbonating CE introduced secondary gypsum into the binder system, leading to more ettringite formed in pores after water curing, aligning with thermodynamic modeling predictions. Its formation refined the pore structure, leading to 28d strength of CE20 (93.4 MPa) exceeding the OPC reference by 21.1 %. These findings underscored the potential of using CE as an SCM in dry-cast non-structural concrete and the advantages of carbonating minerals to generate secondary gypsum and ettringite for enhancing concrete properties.
当使用含氯塑料作为替代燃料时,会在水泥窑的预热器涂层中形成一种不溶于水的矿物,小球藻(CE, Ca10(SiO4)3(SO4)3Cl2)。本文研究了采用CE作为SCM来提高含氯燃料在水泥制造中的利用率的可行性。采用零和易性压实法制备的干铸体(CE20),用20 wt% CE替代后,由于水泥含量减少,经1d碳化养护后抗压强度下降。然而,碳化CE将二次石膏引入粘合剂体系,导致水固化后孔隙中形成更多的钙矾石,这与热力学模型预测一致。它的形成细化了孔隙结构,使得CE20的28d强度(93.4 MPa)比OPC参考值高出21.1%。这些发现强调了在干浇非结构混凝土中使用CE作为SCM的潜力,以及碳化矿物产生二次石膏和钙矾石以增强混凝土性能的优势。
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引用次数: 0
Enhancing the workability retention of one-part alkali activated binders by adjusting the chemistry of the activators 通过调整活化剂的化学性质来提高单组分碱活化粘合剂的可加工性
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-10 DOI: 10.1016/j.cemconcomp.2025.105928
Han Gao , Iman Munadhil Abbas Al-Damad , Ayesha Siddika , Taehwan Kim , Stephen Foster , Ailar Hajimohammadi
Alkali activated materials (AAMs), are gaining traction as sustainable alternatives to traditional Portland cement. However, their practical application is often limited by rapid setting times and poor workability. Although sodium carbonate and silica fume have been applied in synthesising AAMs, their effects on the reaction kinetics and structural development of one-part AAMs remain unknown. This research addresses this knowledge gap by investigating the impact of partially replacing sodium metasilicate with a blend of sodium carbonate and densified silica fume. Our study reveals that this substitution extends the setting time of one-part AAMs by eight times while maintaining comparable compressive strength after three days of curing. Detailed analyses using in-situ FTIR, activator dissolution, and isothermal calorimetry show that delayed dissolution of silica fume and carbonate ions significantly slows early-age reactions. This delayed reaction enhances the workability retention of one-part AAMs. Moreover, the modified AAM develops a more robust C-(N)-A-S-H gel structure, characterised by longer chain lengths and higher crosslinking. These findings provide a practical solution for improving the workability and structural integrity of one-part AAMs, paving the way for the development of advanced one-part AAMs with commercial viability and superior performance.
碱活化材料(AAMs)作为传统硅酸盐水泥的可持续替代品正受到越来越多的关注。然而,它们的实际应用往往受到凝结时间短和可加工性差的限制。虽然碳酸钠和硅灰已被用于合成AAMs,但它们对单组分AAMs的反应动力学和结构发展的影响尚不清楚。本研究通过研究用碳酸钠和致密硅粉的混合物部分取代偏硅酸钠的影响,解决了这一知识差距。我们的研究表明,这种替代将单组分AAMs的凝结时间延长了8倍,同时在养护3天后保持相当的抗压强度。使用原位红外光谱、活化剂溶解和等温量热法进行的详细分析表明,硅灰和碳酸盐离子的延迟溶解显著减缓了早期反应。这种延迟反应增强了单组分aam的可加工性保留。此外,改性AAM形成了更坚固的C-(N) a - s - h凝胶结构,具有更长的链长和更高的交联性。这些发现为提高单片式aam的可加工性和结构完整性提供了切实可行的解决方案,为开发具有商业可行性和优越性能的先进单片式aam铺平了道路。
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引用次数: 0
New insights into the interaction between seawater and CO2-activated calcium silicate composites 海水与二氧化碳活化硅酸钙复合材料相互作用的新见解
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105929
Farzana Mustari Nishat, Ishrat Baki Borno, Adhora Tahsin, Warda Ashraf
This article presents the investigation findings on the combined effect of seawater and carbonation curing on two types of binders – blended binder containing blast furnace slag (BFS) and laboratory synthesized pure β-C2S. Samples were prepared using freshwater and seawater as mixing water. After casting, the samples were exposed to accelerated CO2 curing for 7 days and then exposed to seawater for up to 90 days. The results revealed that the use of seawater as mixing water has substantially different effects on the performances of β-C2S compared to blended cement. Specifically, the use of seawater as the mixing water resulted in a threefold increase in the amount of carbonates formation in β-C2S paste compared to the samples prepared by mixing with fresh water. The seawater mixed and CO2 cured β-C2S paste samples showed continuous increase in strength even after extended exposure to seawater and reached around 75 MPa strength, which is nearly 100 % increase compared to the samples prepared with freshwater mixing. For β-C2S samples, the presence of Mg ions along with slightly higher pH resulted in the formation of vaterite and Mg-calcite contributing to superior performances. Additionally, after exposure to seawater, the silica gel phase captured Mg from seawater to form M-S-H. However, such drastic benefits of using seawater were not observed in the case of blended binders. The presence of Al in blended cement led to the formation of layered double hydroxides, including hydrotalcite and hydrocalumite, which limited the benefits of using seawater. Additionally, the presence of Al also resulted in the formation of ettringite when exposed to seawater. Because of these effects, a slight reduction in strength was observed in case of carbonation cured blended cement after their exposure to seawater.
本文介绍了海水和碳化固化对两种粘结剂——含高炉渣混合粘结剂(BFS)和实验室合成纯β-C2S的联合作用的研究结果。以淡水和海水为混合水制备样品。铸造后,将样品暴露在加速CO2固化中7天,然后暴露在海水中长达56天。结果表明,海水作为混炼水对β-C2S性能的影响与混炼水泥有较大差异。具体而言,与淡水混合制备的样品相比,使用海水作为混合水导致β-C2S膏体中碳酸盐的形成量增加了三倍。海水混合和CO2固化后的β-C2S膏体试样即使长时间暴露在海水中,强度也持续提高,强度可达75 MPa,与淡水混合制备的样品相比,强度提高了近100%。然而,在混合粘合剂的情况下,使用海水没有观察到如此巨大的好处。对于纯β-C2S, Mg离子的存在和稍高的pH值导致了钙矾石和镁方解石的形成,从而获得了优异的性能。此外,暴露于海水后,硅胶相从海水中捕获Mg形成M-S-H。另一方面,混合水泥中Al的存在导致了层状双氢氧化物的形成,包括水滑石和水矾土,这限制了使用海水的好处。此外,铝的存在也导致暴露在海水中形成钙矾石。由于这些影响,碳化固化水泥在暴露于海水后强度略有下降。
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引用次数: 0
Porous biochar for improving the CO2 uptake capacities and kinetics of concrete 多孔生物炭改善混凝土的CO2吸收能力和动力学
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105932
Matthieu Mesnage , Rachelle Omnée , Johan Colin , Hamidreza Ramezani , Jena Jeong , Encarnacion Raymundo-Piñero
Carbonation is a natural process in concrete where atmospheric CO2 diffuses into the pores of the material and reacts with cement hydrates to form calcium carbonate. Although this process can help to sequester atmospheric CO2 and mitigate rising levels in urban areas, it slows down over time, resulting in low CO2 uptake over the service life of concrete. This study proposes a sustainable method to improve carbonation kinetics and CO2 capture in cement materials by incorporating highly porous biochar. The biochar, derived from seaweed pyrolysis, has a highly developed surface area, including micropores optimised for CO2 adsorption, mesopores and macropores, as well as oxygen-rich surface groups. These properties allow the biochar to efficiently adsorb CO2 and retain water. The biochar particles embedded in the cement matrix act as reservoirs for water and CO2, influencing hydration and carbonation. The addition of biochar increases water retention in the composite, which promotes the formation of capillary pores and enhances the carbonation process. Experimental data and numerical simulations show that the adsorption of CO₂ in the micropores of biochar facilitates the flow of CO2 through the composite, allowing deeper carbonation. The interaction between biochar and cement matrix enhances CO2 diffusion and promotes calcium carbonate formation both within the biochar and at the biochar-cement interface, further improving CO2 uptake. The study demonstrates that the incorporation of porous biochar into cement materials significantly increases their potential for CO2 capture, offering a promising approach to sustainable construction and carbon sequestration.
碳化是混凝土中的一个自然过程,大气中的二氧化碳扩散到材料的孔隙中,与水泥水合物反应形成碳酸钙。虽然这一过程可以帮助隔绝大气中的二氧化碳,缓解城市地区不断上升的二氧化碳水平,但随着时间的推移,它的速度会减慢,导致混凝土在使用寿命期间的二氧化碳吸收量较低。本研究提出了一种可持续的方法,通过加入高多孔生物炭来改善水泥材料中的碳化动力学和二氧化碳捕获。由海藻热解得到的生物炭具有高度发达的表面积,包括用于吸附CO2的微孔、中孔和大孔,以及富氧表面基团。这些特性使生物炭能够有效地吸附二氧化碳并保持水分。嵌入水泥基质中的生物炭颗粒作为水和二氧化碳的储层,影响水化和碳酸化。生物炭的加入增加了复合材料的保水能力,促进了毛细孔的形成,加快了碳化过程。实验数据和数值模拟表明,生物炭微孔对CO2的吸附促进了CO2在复合材料中的流动,从而实现了更深层次的碳化。生物炭和水泥基质之间的相互作用增强了CO2的扩散,促进了生物炭内部和生物炭-水泥界面碳酸钙的形成,进一步提高了CO2的吸收。该研究表明,将多孔生物炭掺入水泥材料可显著提高其二氧化碳捕获潜力,为可持续建筑和碳封存提供了一种有前景的方法。
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引用次数: 0
Energy storage properties and mechanical strengths of 3D printed porous concrete structural supercapacitors reinforced by electrodes made of carbon-black-coated Ni foam 碳黑涂层镍泡沫电极增强的3D打印多孔混凝土结构超级电容器的储能性能和机械强度
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105926
Qifeng Lyu , Yalun Wang , Dongjian Chen , Shiyuan Liu , Justin Mbabazi , Pinghua Zhu , Jiquan Lu , Shaowei Wang , Fengxiang Yin
To increase the manufacturing efficiency of rechargeable concrete which can alleviate the problem that intermittent new energy is difficult to integrate into the power grid, a new type of concrete structural supercapacitor (CSSC) was proposed here by using mortar-extrusion 3D printing with the carbon-black-coated Ni foam being the electrodes and reinforcement. The printability, energy storage properties, mechanical strengths, and microstructures of the printed CSSC were investigated and analyzed. Results showed adding electrodes increased the buildability because the Ni foam provided more supportiveness for the mortar. However, too many electrodes, especially for thicker ones, would damage the buildability, because thicker electrodes hindered mortar extrusion. The energy storage properties, i.e., the maximum areal capacitance and ionic conductivity of the printed CSSC are 1.59 mF/cm2 and 7.2 mS/cm, respectively, which can be increased by using more conductive electrolytes. Furthermore, adding carbon black to the electrodes or increasing the thickness of the electrodes enhanced the areal capacitance and ionic conductivity, because these methods increased the contact area of electrons and ions. The maximum compressive strength and flexural strength of the printed CSSC are 32.5 MPa and 12.9 MPa, respectively, which benefited from better printability and reinforcement. However, more thicker electrodes would over-reinforce the concrete. Moreover, the carbon black reduced the bonding between the printing mortar and Ni foam, resulting in decreased mechanical strength of the printed CSSC. This study provides an efficient method to manufacture the CSSC, and insights into the properties of the printed CSSC, which may facilitate future CSSC applications.
为了提高可充电混凝土的制造效率,缓解间歇性新能源难以融入电网的问题,本文提出了一种新型混凝土结构超级电容器(CSSC),采用砂浆挤压3D打印技术,以炭黑涂层镍泡沫作为电极和增强材料。研究和分析了该材料的打印性能、储能性能、机械强度和微观结构。结果表明,电极的加入提高了砂浆的可建造性,因为Ni泡沫为砂浆提供了更大的支撑力。然而,过多的电极,特别是较厚的电极,会破坏可建造性,因为较厚的电极阻碍了砂浆的挤出。打印的CSSC的最大面电容和离子电导率分别为1.59 mF/cm2和7.2 mS/cm,通过使用更多的导电电解质可以提高CSSC的储能性能。此外,在电极中加入炭黑或增加电极的厚度可以增强面电容和离子电导率,因为这些方法增加了电子和离子的接触面积。该材料的最大抗压强度和抗折强度分别为32.5 MPa和12.9 MPa,具有较好的印刷性和补强性。然而,更厚的电极会过度加固混凝土。此外,炭黑降低了印刷砂浆与Ni泡沫之间的结合,导致印刷CSSC的机械强度下降。本研究提供了一种有效的制备CSSC的方法,并对打印的CSSC的性能有了深入的了解,这可能为CSSC的未来应用提供帮助。
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引用次数: 0
Microstructure transformation of MCM-41 modified cement paste subjected to thermal load and modelling of its pore size distribution MCM-41改性水泥浆体在热载荷作用下的微观结构变化及孔径分布建模
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105930
Maciej Szeląg, Patryk Rumiński, Rafał Panek
This study examines the effects of highly reactive, mesoporous MCM-41 silica on the thermal resistance and microstructural stability of Portland cement paste (CP). The motivation is to enhance cement composites (CC) properties using supplementary cementitious materials (SCMs), addressing environmental challenges from global cement production. The research involved modifying CP with 0–2 wt% MCM-41 and subjecting it to thermal loads from 20 °C to 700 °C. Evaluations included compressive and tensile strengths, density, water absorption, and shrinkage. Characterization techniques like X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP) analysed phase composition and pore distribution. Results showed that MCM-41 significantly improved compressive strength, with a 26.9 % increase at 0.75 wt% content. Tensile strength also improved up to 33.8 % for 0.25–1 wt% MCM-41 content. Thermal stability tests indicated enhanced performance in the 200–500 °C range by reducing microcrack formation. XRD analysis revealed that MCM-41 influenced the phase composition, particularly delaying the thermal decomposition of portlandite and enhancing the stability of calcium silicate hydrates (CSH). Microstructural analysis revealed a denser, more cohesive cement matrix with reduced water absorption and shrinkage, enhancing durability. Additionally, MIP studies showed that MCM-41 contributed to a finer pore structure, improving the overall mechanical properties despite increased porosity. To supplement the findings, peak models have been tested to assess the ability to numerically predict pore size distribution of thermally loaded CP. Thus, MCM-41 is effective for improving the thermal and mechanical properties of CP, offering potential for applications in thermally stressed environments, contributing to more sustainable construction materials.
本研究考察了高活性、介孔的MCM-41二氧化硅对硅酸盐水泥浆(CP)的耐热性和微观结构稳定性的影响。其动机是使用补充胶凝材料(scm)来提高水泥复合材料(CC)的性能,解决全球水泥生产带来的环境挑战。研究包括用0-2 wt.%的MCM-41修饰CP,并使其承受20°C至700°C的热负荷。评估包括抗压和抗拉强度、密度、吸水率和收缩率。表征技术如x射线衍射(XRD)和汞侵入孔隙测定(MIP)分析了相组成和孔隙分布。结果表明,MCM-41在0.75 wt.%的添加量下,抗压强度提高了26.9%。当MCM-41含量为0.25-1 wt.%时,抗拉强度也提高了33.8%。热稳定性测试表明,通过减少微裂纹的形成,在200-500°C范围内提高了性能。XRD分析表明,MCM-41对相组成有一定的影响,特别是延缓了硅酸盐的热分解,增强了硅酸钙水合物(CSH)的稳定性。微观结构分析表明,水泥基质密度更大,黏结性更强,吸水率和收缩率降低,耐久性提高。此外,MIP研究表明,MCM-41有助于更精细的孔隙结构,尽管孔隙度增加,但整体力学性能得到改善。为了补充研究结果,测试了峰值模型,以评估数值预测热载荷CP的孔径分布的能力。因此,MCM-41可以有效改善CP的热性能和力学性能,为热应力环境中的应用提供了潜力,为更可持续的建筑材料做出贡献。
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引用次数: 0
Insights into the synergistic action of initial hydration and subsequent carbonation of Portland cement 硅酸盐水泥初始水化和后续碳酸化的协同作用
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105924
Jionghuang He, Yingliang Zhao, Yong Tao, Peiliang Shen, Chi Sun Poon
Pretreatment-induced initial hydration would significantly influence subsequent carbonation. However, the evolution of microstructure and performance resulting from the synergistic action of hydration and carbonation remains systematically unexplored. This study investigates carbonation kinetics, microstructure and micro/macro mechanical properties of carbonated cement pastes (CCPs) under the synergistic action of initial hydration and subsequent carbonation, while elucidating the underlying mechanisms. The results revealed that unhydrated cement exhibited a peak carbonation rate of 0.65 W/g, increasing by approximately 83 % when the cement underwent an 8 h of initial curing, demonstrating the enhancement in the carbonation reactivity due to initial hydration. However, the carbonation efficiency of CCPs increased initially and then decreased as initial hydration extended. This trend emerged because initial hydration enhanced carbonation reactivity, whereas excessive hydration concurrently obstructed CO2 transport. Furthermore, optimal initial hydration was essential for the synergistic interaction between hydration and carbonation, resulting in reduced porosity and a more homogeneous microstructure, as well as improved mechanical properties. These findings underscore the need to carefully consider the synergistic action of initial hydration and subsequent carbonation when designing pretreatment protocols.
预处理诱导的初始水化对后续的碳酸化有显著影响。然而,由于水化和碳酸化的协同作用,微观结构和性能的演变仍然没有系统的探索。本研究研究了在初始水化和后续碳化协同作用下碳化水泥浆体的碳化动力学、微观结构和微观/宏观力学性能,并阐明了其潜在机制。结果表明,未水化水泥的碳化率峰值为0.65 W/g,当水泥经过8 h的初始养护时,碳化率提高了约83%,表明初始水化作用增强了水泥的碳化反应性。随着初始水化时间的延长,ccp的碳化效率先升高后降低。这一趋势的出现是因为初始水化增强了碳化反应性,而过度水化同时阻碍了二氧化碳的运输。此外,最佳初始水化对于水化和碳化之间的协同作用至关重要,从而降低孔隙率,获得更均匀的微观结构,并改善力学性能。这些发现强调,在设计预处理方案时,需要仔细考虑初始水化和随后的碳酸化的协同作用。
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引用次数: 0
Mechanical performance enhancement of UHPC via ITZ improvement using graphene oxide-coated steel fibers 利用氧化石墨烯包覆钢纤维改善超高性能聚乙烯的机械性能
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-08 DOI: 10.1016/j.cemconcomp.2025.105931
Yuan Gao , Zhangjianing Cheng , Jiajian Yu , Xiaonong Guo , Yanming Liu , Weiqiang Chen
By virtue of its superior strength, high toughness, and low porosity, ultra-high-performance concrete (UHPC) has a wide range of application prospects in construction engineering. However, the interfacial transition zone (ITZ) formed between the cementitious matrix and steel fiber seriously restricts the steel fiber's strength utilization rate in UHPC. Hence, in this work, graphene oxide (GO) is employed to be coated on the steel fiber surface to strengthen the UHPC. The results demonstrate that through a three-step GO coating approach, the roughness and hydrophilicity of the steel fiber surface can be enhanced by about 280.6 % and 40.6 % compared with plain steel fiber. The coated GO can provide pore-infilling and nucleation effects during the hydration processes of the UHPC, thus decreasing the porosity by 37.5 % compared with non-GO reinforcement. After the three-step coating treatment, the compressive and bending strength of the coated-GO reinforced UHPC is enhanced by 33.7 % and 26.2 %, respectively. The molecular dynamic simulation results further reveal that benefiting from the crack-bridging effects of the coated GO, the interface between the steel fiber surface and cement matrix is prone to a ductile failure, with the failure energy of the C-S-H composites increasing by about 320%–1340 %. The findings advanced by this work can enhance the understanding of nano-cement technology and promote the potential application of the GO-coated fiber to generate high-performance UHPC.
超高性能混凝土(UHPC)凭借其优越的强度、高韧性、低孔隙率等特点,在建筑工程中有着广泛的应用前景。然而,胶凝基质与钢纤维之间形成的界面过渡区(ITZ)严重制约了钢纤维在UHPC中的强度利用率。因此,在本研究中,采用氧化石墨烯(GO)涂层在钢纤维表面来增强UHPC。结果表明,通过三步氧化石墨烯涂层方法,钢纤维表面的粗糙度和亲水性分别比普通钢纤维提高约280.6%和40.6%。在UHPC水化过程中,包覆氧化石墨烯具有充孔和成核作用,孔隙率比未包覆氧化石墨烯降低了37.5%。经过三步包覆处理后,包覆氧化石墨烯增强UHPC的抗压强度和抗弯强度分别提高了33.7%和26.2%。分子动力学模拟结果进一步表明,得益于包覆氧化石墨烯的裂缝桥接作用,钢纤维表面与水泥基体之间的界面容易发生延性破坏,C-S-H复合材料的破坏能提高约320% ~ 1340%。本文的研究结果可以增强人们对纳米水泥技术的认识,促进氧化石墨烯包覆纤维在高性能UHPC中的潜在应用。
{"title":"Mechanical performance enhancement of UHPC via ITZ improvement using graphene oxide-coated steel fibers","authors":"Yuan Gao ,&nbsp;Zhangjianing Cheng ,&nbsp;Jiajian Yu ,&nbsp;Xiaonong Guo ,&nbsp;Yanming Liu ,&nbsp;Weiqiang Chen","doi":"10.1016/j.cemconcomp.2025.105931","DOIUrl":"10.1016/j.cemconcomp.2025.105931","url":null,"abstract":"<div><div>By virtue of its superior strength, high toughness, and low porosity, ultra-high-performance concrete (UHPC) has a wide range of application prospects in construction engineering. However, the interfacial transition zone (ITZ) formed between the cementitious matrix and steel fiber seriously restricts the steel fiber's strength utilization rate in UHPC. Hence, in this work, graphene oxide (GO) is employed to be coated on the steel fiber surface to strengthen the UHPC. The results demonstrate that through a three-step GO coating approach, the roughness and hydrophilicity of the steel fiber surface can be enhanced by about 280.6 % and 40.6 % compared with plain steel fiber. The coated GO can provide pore-infilling and nucleation effects during the hydration processes of the UHPC, thus decreasing the porosity by 37.5 % compared with non-GO reinforcement. After the three-step coating treatment, the compressive and bending strength of the coated-GO reinforced UHPC is enhanced by 33.7 % and 26.2 %, respectively. The molecular dynamic simulation results further reveal that benefiting from the crack-bridging effects of the coated GO, the interface between the steel fiber surface and cement matrix is prone to a ductile failure, with the failure energy of the C-S-H composites increasing by about 320%–1340 %. The findings advanced by this work can enhance the understanding of nano-cement technology and promote the potential application of the GO-coated fiber to generate high-performance UHPC.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105931"},"PeriodicalIF":10.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937250","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
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Cement & concrete composites
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