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Rheology and mechanical properties of limestone calcined clay based engineered cementitious composites with nano CaCO3 石灰石煅烧粘土基纳米碳酸钙工程胶凝复合材料的流变学和力学性能
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-07 DOI: 10.1016/j.cemconcomp.2025.105923
Yuting Wang , Meng Chen , Tong Zhang , Mingzhong Zhang
The application of advanced binder consisting of limestone, calcined clay and cement (LC3) promotes the development of low-carbon engineering cementitious composites (ECC). In order to improve the comprehensive properties of LC3-ECC, this paper investigates the feasibility of using nano CaCO3 (NC) to replace the limestone powder up to 20 % for LC3-ECC preparation through rheology and mechanical tests along with the micro-design calculation and microstructure analysis. Results indicate that the yield stress and plastic viscosity of LC3-ECC are largely improved with increasing NC replacement rate. Meanwhile, the compressive, flexural and tensile strengths of LC3-ECC with NC raise firstly and then decline, while the strengths are maximum at NC replacement rate of 5 % but the tensile strain capacity remains at 2.3 %. The hydration promotion effect and pore structure refinement effect of NC particles improve the mechanical strength of LC3-ECC, but the performance degradation occurs when the replacement rate of the NC exceeds 10 %. In micromechanics, the fibre bridging stress of LC3-ECC reinforced by NC with replacement rate of 5 % decreases by 18.5 % compared to that of without NC, but it grows with the increasing NC replacement rate. In combination with fresh, hardened and microstructure behaviour, LC3-ECC exhibits the optimum mechanical behaviour with the NC replacement rate of 10 %–15 %.
由石灰石、煅烧粘土和水泥组成的粘结剂(LC3)的应用促进了低碳工程胶凝复合材料(ECC)的发展。为了提高LC3-ECC的综合性能,本文通过流变学和力学试验,以及微观设计计算和微观结构分析,探讨了用纳米CaCO3 (NC)代替20%石灰石粉制备LC3-ECC的可行性。结果表明,随着NC替代率的增加,LC3-ECC的屈服应力和塑性粘度有较大的提高。同时,添加NC后LC3-ECC的抗压、抗弯和抗拉强度均呈先上升后下降的趋势,当NC替换率为5%时强度达到最大值,而拉伸应变能力保持在2.3%。NC颗粒的水化促进作用和孔隙结构细化作用提高了LC3-ECC的机械强度,但当NC的替代率超过10%时,性能下降。细观力学方面,NC替代率为5%的LC3-ECC的纤维桥接应力比未NC增强的LC3-ECC降低18.5%,但随NC替代率的增加而增大。结合新鲜、硬化和微观组织行为,LC3-ECC在NC替换率为10%-15%时表现出最佳的力学行为。
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引用次数: 0
Carbon capture and storage CO2 foam concrete towards higher performance: Design, preparation and characteristics 面向更高性能的碳捕获和封存二氧化碳泡沫混凝土:设计、制备和特性
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-07 DOI: 10.1016/j.cemconcomp.2025.105925
Dingqiang Fan , Jian-Xin Lu , Xue-Sen Lv , Takafumi Noguchi , Rui Yu , Chi Sun Poon
This study introduces a novel strategy for carbon capture and utilization by incorporating CO2 into foams to develop CO2 foam concrete (CFC) with high performance. A conceptual design approach for CFC was first proposed by incorporating tailor-made CO2 foam into an optimized cement-based paste. The engineered CO2 foam exhibited fine size and good stability, but increasing CO2 concentration decreased stability. Then, the CO2 foam was used to fabricate CFC with high strength (about twice that of normal foam concrete at a similar density), excellent durability (comparable to normal concrete), and low thermal conductivity. Moreover, it was demonstrated that CO2 foam induced positive internal carbonation effects to further enhance the CFC performance. These effects included promoting cement hydration efficiency and generating CaCO3 on the foam wall for strength enhancement. Also, the rational use of CO2 foams optimized the CFC pore structures, including reducing porosity, refining pore size, and improving pore uniformity. The CFC exhibited exceptional carbon capture, sequestering 87 kg of CO2 per m3 of concrete by internal and external carbonations (active carbon reduction), and could reduce electricity consumption and the corresponding carbon emissions (indirect carbon reduction). This innovative material offers a promising pathway towards sustainable construction and carbon neutrality.
本研究介绍了一种新的碳捕获和利用策略,即将二氧化碳掺入泡沫中,以开发高性能的二氧化碳泡沫混凝土(CFC)。首先提出了一种CFC的概念设计方法,将定制的二氧化碳泡沫气泡纳入优化的水泥基浆料中。工程CO2泡沫具有粒径细、稳定性好的特点,但CO2浓度的增加会降低泡沫的稳定性。然后,使用CO2泡沫来制造具有高强度(在相同密度下约为普通泡沫混凝土的两倍)、优异耐久性(与普通混凝土相当)和低导热性的CFC。此外,还证明了CO2泡沫诱导正向内碳化效应,从而进一步提高CFC性能。这些影响包括提高水泥水化效率和在泡沫壁上生成CaCO3以增强强度。同时,CO2泡沫的合理使用优化了CFC的孔隙结构,包括降低孔隙率、细化孔径、提高孔隙均匀性等。CFC表现出优异的碳捕获能力,通过内部和外部碳化(活性炭减量),每立方米混凝土可封存87千克二氧化碳,并可减少电力消耗和相应的碳排放(间接碳减量)。这种创新材料为可持续建筑和碳中和提供了一条有希望的途径。
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引用次数: 0
Activation of BOF slag with dipotassium hydrogen phosphate: Enhancing hydration, carbonation resistance, and heavy metal leaching 磷酸氢二钾活化转炉炉渣:增强水化、抗碳化和重金属浸出
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105922
Yanjie Tang , Katrin Schollbach , Sieger van der Laan , Wei Chen
This study investigates the hydration of basic oxygen furnace (BOF) slag activated by dipotassium hydrogen phosphate (DKP) up to 3 wt%. The findings reveal that DKP-activated BOF slag pastes exhibit improved strength, leaching behavior, and carbonation resistance. DKP-activated BOF slag pastes facilitate the completion of the main exothermic reaction within 3 days. Increasing DKP from 1 to 3 wt% extends the induction period while enhancing overall hydration heat. This is attributed to the consumption of C2S and brownmillerite, and the formation of hydrogarnet, C-S-H gel, and layered double hydroxides (LDHs). Concomitantly, porosity reduces from 40.73 to 22.36 %, leading to significant strength gaining from 1.9 to 42.5 MPa over 28 days. Moreover, DKP-containing samples exhibit satisfactory carbonation resistance and limited heavy metal leaching, complying with the Dutch Soil Quality Decree (SQD). The study highlights the potential of phosphate activation to enhance the durability and environmental performance of BOF slag-based materials.
本文研究了3wt %的磷酸氢二钾(DKP)对碱性氧炉(BOF)炉渣的水化作用。研究结果表明,dkp活化的转炉炉渣膏体具有较好的强度、浸出性能和抗碳化性能。dkp活化转炉炉渣膏体有利于在3天内完成主放热反应。将DKP从1 wt.%增加到3 wt.%,延长了诱导期,同时提高了总水化热。这是由于C2S和褐煤的消耗,以及水榴石、C-S-H凝胶和层状双氢氧化物(LDHs)的形成。同时,孔隙度从40.73降低到22.36%,强度在28天内从1.9 MPa显著提高到42.5 MPa。此外,含有dkp的样品表现出令人满意的抗碳化性和有限的重金属浸出,符合荷兰土壤质量法令(SQD)。该研究强调了磷酸盐活化在提高转炉炉渣基材料的耐久性和环保性能方面的潜力。
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引用次数: 0
Comparative analysis of carbonation strengthening mechanisms in full solid waste materials: Steel slag vs. carbide slag 全固体废弃物中碳化强化机理的比较分析:钢渣与电石渣
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105927
Qi Zhang , Pan Feng , Xuyan Shen , Yuxi Cai , Houru Zhen , Zhichao Liu
Maximizing the use of solid wastes to replace energy-intensive cement while maintaining the comparable mechanical properties is a promising strategy for developing negative carbon building materials. In this paper, full steel slag/carbide slag blocks were prepared by pressing and subsequent carbonation to enhance mechanical properties and capture CO2. The evolution of carbonation degree and compressive strength with varying liquid to solid ratios and carbonation durations were characterized, followed by a comparative analysis of carbonation strengthening mechanisms. The results show that carbonation significantly improves compressive strengths, exhibiting a linear relationship between carbonation degree and compressive strength. The maximum carbonation degrees and compressive strengths achieved were 24.56 % and 79.68 MPa for full steel slag blocks, and 64.46 %, 44.64 MPa for full carbide slag blocks, respectively. Although the maximum carbonation degree of full steel slag blocks is only about one-third of that of the full carbide slag blocks, their superior compressive strength can be attributed to denser microstructures, stronger bonding properties between steel slag particles and carbonated products, and a larger effective elastic modulus. This study provides a new insight into the carbonation strengthening mechanisms based on the inherent properties of different materials and introduces a novel concept for creating high-performance, eco-friendly building materials.
最大限度地利用固体废物来替代能源密集型水泥,同时保持相当的机械性能,是开发负碳建筑材料的一个有前途的策略。本文通过压制和后续碳化制备了全钢渣/电石渣块,以提高其力学性能和捕集CO2。研究了不同液固比和碳化时间下碳化程度和抗压强度的变化规律,并对碳化强化机理进行了对比分析。结果表明:碳化显著提高了抗压强度,碳化程度与抗压强度呈线性关系;全钢渣块的最大碳化度和抗压强度分别为24.56%和79.68 MPa,全电石渣块的最大碳化度和抗压强度分别为64.46%和44.64 MPa。虽然全钢渣块的最大碳化程度仅为全电石渣块的三分之一左右,但其优异的抗压强度可归因于其组织更致密,钢渣颗粒与碳化产物之间的结合性能更强,有效弹性模量更大。本研究为基于不同材料固有特性的碳化强化机制提供了新的见解,并为创造高性能、环保的建筑材料引入了新的概念。
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引用次数: 0
In-depth analysis of Lime-hemp concrete and water vapor interactions: Effect of water default and prediction of the sorption behavior 石灰-大麻混凝土与水蒸气相互作用的深入分析:水违约的影响和吸附行为的预测
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105921
Brahim Mazian , Giana Almeida , Nils Frantz , Patrick Perré
Lime-hemp concrete (LHC) emerges as a sustainable building material due to its low embodied energy, carbon storage capabilities, and interesting properties for both winter and summer comfort. However, a comprehensive understanding of its moisture behavior is pivotal for its development and application in construction. This study investigates the moisture sorption behavior and isotherm characteristics of LHC across four formulations varying in density (321–478 kg/m³) and binder/particle weight ratios (BP = 1 and 2). Using a strict equilibrium criterion, over 3000 h of Dynamic Vapor Sorption (DVS), experiments revealed some formulations failed to reach equilibrium during adsorption at RH levels above 60 %, indicating irreversible processes characterized by offsets in equilibrium moisture content (EMC) at 0 % RH after a complete cycle. These phenomena were attributed to insufficient water availability during mixing and/or excessive compaction. Formulations with a higher weight ratio (B/P = 2) and significant compaction, such as BP2_420, exhibited the highest desorption offset (7.5 % EMC), while those with a lower B/P weight ratio (B/P = 1), such as BP1_379, showed reduced offsets below 2 %, due to better water distribution. The study also showed that reversible sorption behavior, corrected for offsets, could be accurately described using the Guggenheim-Anderson-de Boer (GAB) model. Finally, the rule of mixtures reliably predicted sorption isotherms by combining the GAB parameters of hemp shive particles and binder, with deviations limited to a maximum error of 2.3 %.
石灰-大麻混凝土(LHC)因其低能耗、碳储存能力和冬季和夏季舒适的有趣特性而成为一种可持续建筑材料。然而,全面了解其水分行为对其在建筑中的发展和应用至关重要。本研究研究了密度(321-478 kg/m³)和粘合剂/颗粒重量比(BP = 1和2)不同的四种配方的LHC吸湿行为和等温线特性。使用严格的平衡标准,超过3000小时的动态蒸汽吸附(DVS),实验显示一些配方在RH水平高于60%时未能达到吸附平衡。表明不可逆过程,其特征是在0% RH下平衡水分含量(EMC)在完整循环后出现偏移。这些现象是由于混合时可用水量不足和/或过度压实造成的。高质量比(B/P=2)和显著压实的配方,如BP2_420,具有最高的解吸偏移量(7.5% EMC),而低质量比(B/P=1)的配方,如BP1_379,由于水分分布较好,解吸偏移量减小到2%以下。研究还表明,可逆吸附行为,校正偏移量,可以准确地描述使用Guggenheim-Anderson-de Boer (GAB)模型。最后,结合麻屑颗粒和粘结剂的GAB参数,混合规则可靠地预测了吸附等温线,偏差限制在2.3%以内。
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引用次数: 0
Effect of soluble phosphate on strength development of anhydrite calcined from phosphogypsum 可溶性磷酸盐对磷石膏煅烧硬石膏强度发展的影响
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-03 DOI: 10.1016/j.cemconcomp.2025.105920
Ying Hua , Zhichao Zhang , Lu Yuan , Jueshi Qian , Yanfei Yue , Zhen Li , Xingwen Jia
The soluble phosphates in phosphogypsum (PG) are generally considered to hinder its utilization without pretreatments. This paper investigated the positive effect of soluble phosphates on the strength development of anhydrite calcined from PG at 800 °C for 1 h. PG, washed PG with different soluble phosphate contents, washed PG added with washed water, and flue gas desulfurization gypsum (FGD) were used to prepare anhydrite. The hydration degree and strength development of anhydrite were measured. The effect mechanism was explored by XRD, FTIR, and SEM. Results showed the 28-day strength decreased from 35.9 MPa to almost no strength when the soluble P2O5 content decreased from 0.7480 % to 0.0471 %. Soluble phosphates in PG would affect the microstructure of anhydrite particles, promoting the strength development, however, they did not affect the strength of anhydrite calcined from FGD. It is concluded that the soluble phosphates in PG are beneficial for manufacturing anhydrite, which is a promising utilization.
一般认为,不进行预处理,磷石膏中的可溶性磷酸盐会阻碍其利用。本文研究了可溶性磷酸盐对PG经800℃煅烧1小时硬石膏强度发展的积极影响。采用PG、不同可溶性磷酸盐含量水洗PG、水洗PG加水洗水、烟气脱硫石膏(FGD)制备硬石膏。测定了硬石膏的水化程度和强度发展。通过XRD、FTIR、SEM等手段探讨了其作用机理。结果表明,当可溶性P2O5含量从0.7480%下降到0.0471%时,28 d强度从35.9 MPa下降到几乎没有强度;PG中的可溶性磷酸盐会影响硬石膏颗粒的微观结构,促进硬石膏的强度发展,但不影响脱硫后硬石膏的强度。结果表明,PG中的可溶性磷酸盐有利于生产硬石膏,具有广阔的应用前景。
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引用次数: 0
Enhancing dispersion and mechanical properties of carbon nanotube-reinforced cement-based material using polymer emulsions 聚合物乳液增强碳纳米管增强水泥基材料的分散性和力学性能
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-03 DOI: 10.1016/j.cemconcomp.2024.105910
Shi-Wei Zhang , Ru Wang , Jiao-Long Zhang , Yong Yuan
This study explores the effect of polymer concentration on the dispersion of carbon nanotubes (CNTs) and the mechanical properties of cement-based materials via tests and molecular dynamics (MD) simulations. The results showed that all three polymers (ethylene-vinyl acetate (EVA), styrene-acrylate (SAE), and styrene-butadiene (SB) copolymers) significantly enhanced CNTs’ dispersion. The key factors driving this improvement are the coordination bond, H-bonds, π-π stacking, and van der Waals forces between the polymer and CNTs, which promote strong adsorption. This reduces the interaction energy generated among the CNTs. Additionally, the combined use of polymers and CNTs improves the mechanical properties of cement-based materials. First, the polymer films and CNTs formed a mesh structure inside the mortar, linking the hydration products, unhydrated cement particles, and aggregates. Secondly, the polymer films wrapped around the surface of the CNTs, which promoted the bond strength between the CNTs and calcium silicate hydrate. The synergistic effect between the polymers and CNTs is a promising approach for the development of advanced cementitious composites. The polymer promoted the dispersion of CNTs, whereas the CNTs compensated for the reduced compressive strength of the polymer-modified mortar and promoted hydration.
本研究通过实验和分子动力学(MD)模拟,探讨了聚合物浓度对碳纳米管(CNTs)分散和水泥基材料力学性能的影响。结果表明,三种聚合物(乙烯-醋酸乙烯酯(EVA)、苯乙烯-丙烯酸酯(SAE)和苯乙烯-丁二烯(SB)共聚物)均显著增强了CNTs的分散性。推动这种改善的关键因素是聚合物与碳纳米管之间的配位键、氢键、π-π堆积和范德华力,它们促进了强吸附。这降低了碳纳米管之间产生的相互作用能。此外,聚合物和碳纳米管的结合使用提高了水泥基材料的力学性能。首先,聚合物薄膜和碳纳米管在砂浆内部形成网状结构,将水化产物、未水化的水泥颗粒和骨料连接起来。其次,聚合物薄膜包裹在CNTs表面,提高了CNTs与水合硅酸钙的结合强度。聚合物与碳纳米管之间的协同作用是开发先进胶凝复合材料的一种很有前途的方法。聚合物促进了碳纳米管的分散,而碳纳米管补偿了聚合物改性砂浆抗压强度的降低并促进了水化。
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引用次数: 0
Micromechanical model and performance-driven design strategy for textile reinforced engineered cementitious composite (TR-ECC) 纺织增强工程胶凝复合材料(TR-ECC)细观力学模型及性能驱动设计策略
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-03 DOI: 10.1016/j.cemconcomp.2025.105919
Peiyun She , Shuhang Ye , Yiming Yao , Deju Zhu , Cong Lu
Textile reinforced engineered cementitious composite (TR-ECC) is a cementitious composite reinforced with continuous textiles and short random fibers, characterized by high tensile strength and strain capacity due to the successive formation of multiple fine cracks. Various tensile failure modes of TR-ECC have been extensively observed in experimental studies, while clear classification of these failure modes and their underlying mechanisms are to be explored. In this study, the novel established numerical model explains the causes of different tensile failure modes of TR-ECC based on the physical interactions among fibers, textiles, and the matrix. In the model, the tensile behavior of TR-ECC was innovatively simulated through a displacement-controlled loading method, while the stress field in different components was analyzed considering five phases: textiles, short fibers, matrix, textile/matrix interface, and fiber/matrix interface. With the proposed model, two distinct tensile failure modes (modes I and II) were identified. Simulated TR-ECC stress-strain curves (OP-I and OP-II) of both failure modes were acquired with adjustments of several key micro-properties on the same base curve under the guidance of the proposed model. OP-I achieved a tensile strength exceeding 9.5 MPa and maintained a strain capacity above 2 % due to secondary hardening after textile rupture, while OP-II exhibited stable multiple cracking with a lower peak strength of 7.2 MPa but a higher strain capacity exceeding 6 %. These two specific optimization strategies were proposed based on the model to address different material performance requirements, providing a framework for performance-driven design of TR-ECC to ensure optimal mechanical performance and durability.
纺织增强工程胶凝复合材料(TR-ECC)是一种以连续纺织品和随机短纤维为增强材料的胶凝复合材料,由于连续形成多个细裂纹,具有较高的抗拉强度和应变能力。在实验研究中广泛观察到TR-ECC的各种拉伸破坏模式,但这些破坏模式的明确分类及其潜在机制有待探讨。在本研究中,基于纤维、纺织品和基体之间的物理相互作用,建立了新的数值模型来解释TR-ECC不同拉伸破坏模式的原因。在该模型中,创新性地采用位移控制加载法模拟了TR-ECC的拉伸行为,并考虑了纺织品、短纤维、基体、纺织品/基体界面和纤维/基体界面五个阶段,分析了不同组分的应力场。根据所提出的模型,确定了两种不同的拉伸破坏模式(模式I和II)。在该模型的指导下,通过对同一基曲线上几个关键微观特性的调整,获得了两种破坏模式下的模拟TR-ECC应力应变曲线(OP-I和OP-II)。OP-I的抗拉强度超过9.5 MPa,应变容量维持在2%以上,而OP-II的抗拉强度较低,峰值强度为7.2 MPa,应变容量较高,超过6%。针对不同的材料性能要求,在此基础上提出了两种具体的优化策略,为TR-ECC的性能驱动设计提供了框架,以确保其最佳的力学性能和耐久性。
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引用次数: 0
Design and function of thermoresponsive-ultrafast stiffening suspension formulations for 3D printing 用于 3D 打印的热粘弹性超快加硬悬浮配方的设计和功能
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2025-01-02 DOI: 10.1016/j.cemconcomp.2024.105905
Sharu Bhagavathi Kandy , Sebastian Remke , Thiyagarajan Ranganathan , Shubham Kiran Wani , Xiaodi Dai , Narayanan Neithalath , Aditya Kumar , Mathieu Bauchy , Edward Garboczi , Torben Gädt , Samanvaya Srivastava , Gaurav Sant
An inability to accurately control the rate and extent of solidification of cementitious suspensions is a major impediment to creating geometrically complex structural shapes via 3D printing. In this work, we have developed a thermoresponsive rapid stiffening system that will stiffen suspensions of minerals such as quartz, limestone, portlandite, and Ordinary Portland Cement (OPC) over a wide pH range. When exposed to trigger temperatures between 40 °C and 70 °C, the polymer binder system undergoes a thermally triggered free radical polymerization (FRP) reaction, leading to an ultrafast stiffening of the suspension at an average rate on the order of 1 kPa/s and achieving MPa-level strength in less than a minute. The cured composites exhibit flexural strength and strain capacity far greater than OPC-based composites (σf 25 MPa, γf > 1 %). We successfully demonstrated 3D printing using these engineered slurries, showcasing their thermal response, thermal latency, and printability, thereby validating our design approach and its potential for diverse applications. These thermoresponsive slurries facilitate freestyle printing, non-horizontal printing, and the creation of complex geometries with high overhangs. This approach provides a means to surmount the significant limitations of extrusion-based 3D printing using particulate suspensions and open up new possibilities in integrating design and production.
无法准确控制胶凝悬浮液的凝固速度和程度是通过3D打印创建几何复杂结构形状的主要障碍。在这项工作中,我们开发了一种热响应快速硬化系统,可以在很宽的pH范围内硬化矿物悬浮物,如石英、石灰石、波特兰石和普通波特兰水泥(OPC)。当暴露在40°C至70°C的触发温度下时,聚合物粘合剂系统会发生热触发自由基聚合(FRP)反应,导致悬浮液以平均1kpa /s的速度进行超快速硬化,并在不到一分钟的时间内达到mpa级别的强度。固化复合材料的抗弯强度和应变能力远高于opc基复合材料(σf ~ 25 MPa, γf>;1%)。我们成功地演示了使用这些工程浆料的3D打印,展示了它们的热响应、热延迟和可打印性,从而验证了我们的设计方法及其在各种应用中的潜力。这些热敏浆液有利于自由打印,非水平打印,以及高悬垂复杂几何形状的创建。这种方法提供了一种方法,可以克服使用颗粒悬浮液的挤压式3D打印的重大限制,并为集成设计和生产开辟了新的可能性。
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引用次数: 0
A novel strategy utilizing graphene oxide/functionalized carbon nanotube/nanosilica sheet for nanomaterial incorporation in cement paste 利用氧化石墨烯/功能化碳纳米管/纳米二氧化硅片在水泥浆中掺入纳米材料的新策略
IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-12-30 DOI: 10.1016/j.cemconcomp.2024.105918
Heongwon Suh , Doheon Koo , Dong-Hee Son , Jin Park , Sooheon Kim , Baek-Il Bae , Chang-Sik Choi , Hongyun So , Sungchul Bae
This study addresses the limitations of conventional methods in incorporating nanomaterials, including prolonged dispersion times and handling challenges in construction field applications, by developing graphene oxide/functionalized carbon nanotube/nanosilica (GCS) sheets. The GCS sheet, as a portable sheet form of a nanomaterial composite, achieves high nanomaterial dispersibility with only 1 min of sonication. The dispersion efficiency of the GCS sheets was evaluated using UV–vis spectroscopy, zeta potential measurements, and transmission electron microscopy, and the impact on material properties was assessed using compressive strength tests. The hydration processes were investigated using X-ray diffraction and 29Si nuclear magnetic resonance, and the nanomaterial dispersion within the cement matrix was studied using synchrotron X-ray nanoimaging. The GCS sheet facilitated more effective nanosilica dispersion on the graphene oxide plane compared to the powder form, achieving optimal dispersion in 1 min. This resulted in enhanced compressive strength, increased polymerization of calcium silicate hydrates, and a more elongated pore structure owing to the reduced aggregation of the GCS composites.
本研究通过开发氧化石墨烯/功能化碳纳米管/纳米二氧化硅(GCS)片,解决了传统方法在结合纳米材料方面的局限性,包括延长分散时间和处理建筑领域应用中的挑战。GCS片材作为纳米材料复合材料的一种便携式片材形式,只需1分钟的超声即可实现高纳米材料的分散性。采用紫外-可见光谱、zeta电位测量和透射电子显微镜评估了GCS片材的分散效率,并通过抗压强度测试评估了对材料性能的影响。利用x射线衍射和29Si核磁共振研究了水化过程,利用同步加速器x射线纳米成像研究了纳米材料在水泥基体中的分散。与粉末形式相比,GCS薄片更有效地促进了纳米二氧化硅在氧化石墨烯平面上的分散,在1分钟内实现了最佳分散。这导致抗压强度增强,硅酸钙水合物的聚合增加,并且由于GCS复合材料的聚集减少,孔隙结构更长。
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引用次数: 0
期刊
Cement & concrete composites
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