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Rheology dependent pore structure optimization of high-performance foam concrete 优化高性能泡沫混凝土的流变孔隙结构
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-25 DOI: 10.1016/j.cemconres.2024.107737
Dingqiang Fan , Chunpeng Zhang , Jian-Xin Lu , Ligang Peng , Rui Yu , Chi Sun Poon
Foam concrete encounters a fundamental challenge in balancing lightweight and high strength. Pore optimization is the key to address this problem. This study starts with rheology control to optimize the pore structure of foam concretes, thereby designing high-performance foam concrete (HPFC). X-ray computed tomography was employed to explore the relationship between rheology and pore characteristics, revealing the corresponding control mechanisms. The findings indicated that rheological parameters, particularly viscosity, significantly influenced pore size, uniformity, sphericity, fractal dimension and connectivity. Therefore, there was an optimal viscosity range (1.30 ± 0.15 Pa·s) for achieving the desirable pore structure. Mechanical analysis demonstrated that the viscosity could impact the balance of the added foams under dynamic and static conditions via drag force, resulting in changes to the pore structure. After pore optimization, the HPFCs exhibited high compressive strength (2–3 times higher than normal foam concrete at an equal density) and excellent durability comparable to high-performance concrete.
泡沫混凝土在兼顾轻质和高强度方面遇到了根本性的挑战。孔隙优化是解决这一问题的关键。本研究从流变控制入手,优化泡沫混凝土的孔隙结构,从而设计出高性能泡沫混凝土(HPFC)。研究采用 X 射线计算机断层扫描技术探讨了流变学与孔隙特征之间的关系,揭示了相应的控制机制。研究结果表明,流变参数,尤其是粘度,对孔隙大小、均匀性、球形度、分形维度和连通性有显著影响。因此,有一个最佳粘度范围(1.30 ± 0.15 Pa-s)可实现理想的孔隙结构。机械分析表明,在动态和静态条件下,粘度会通过阻力影响添加泡沫的平衡,从而导致孔隙结构发生变化。孔隙优化后,HPFCs 表现出很高的抗压强度(在密度相同的情况下比普通泡沫混凝土高 2-3 倍)和与高性能混凝土相当的优异耐久性。
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引用次数: 0
Reactive transport modelling of autogenous self-healing in cracked concrete 裂缝混凝土自生自愈的反应传输模型
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-21 DOI: 10.1016/j.cemconres.2024.107733
Daniel Lahmann, Sylvia Keßler
Autogenous self-healing can close cracks in water-retaining concrete structures. However, its inconsistent efficiency in building practice indicates that the underlying processes are not fully understood. Therefore, this study characterizes reactive transport through cracked concrete and models it using PHREEQC to develop a comprehensive understanding of chemical processes promoting autogenous self-healing. Driven by the dissolution of portlandite, the main cause of healing is the precipitation of CaCO3, which contributes to a crack closure of up to 113 μm. This process is supported by the formation of M-S-H and C-S-H. As self-healing progresses, the rates of dissolution and precipitation processes that promote healing decrease exponentially. At initial flow rates >2 L h−1, CaCO3 precipitation is favored towards the crack outlet. At lower initial flow rates, the formation of CaCO3 shifts towards the crack inlet. These findings underscore the need to reconsider the reliance on effective healing in practical applications.
自生自愈可以封闭保水混凝土结构中的裂缝。然而,其在建筑实践中的效率并不一致,这表明人们对其基本过程并不完全了解。因此,本研究描述了裂缝混凝土中反应性迁移的特征,并使用 PHREEQC 建立模型,以全面了解促进自生自愈合的化学过程。受波长石溶解的驱动,愈合的主要原因是 CaCO3 的析出,这有助于裂缝闭合达 113 μm。M-S-H 和 C-S-H 的形成为这一过程提供了支持。随着自愈合的进行,促进愈合的溶解和沉淀过程的速率呈指数下降。在初始流速为 >2 L h-1 时,CaCO3 向裂缝出口沉淀。在较低的初始流速下,CaCO3 的形成转向裂缝入口。这些发现突出表明,在实际应用中需要重新考虑对有效愈合的依赖。
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引用次数: 0
Rheology control of cement paste by in-situ polymerization for 3D printing applications 通过原位聚合控制水泥浆的流变性,实现 3D 打印应用
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-21 DOI: 10.1016/j.cemconres.2024.107731
Zhaoyang Sun , Yuyang Zhao , Dongshuai Hou , Zongjin Li , Binmeng Chen
Rheology control is the most critical determinant of success in 3D concrete printing (3DCP), typically achieved through the hydration control of cement. However, this inevitably leads to overdesign of printed concrete featuring a low water-to-binder ratio (w/b), which is incompatible with its non-load bearing purpose and raises a series of environmental and durability problems, such as high carbon footprint and early-age shrinkage. Herein, we propose a novel rheology control strategy via in-situ polymerization, allowing the mix design of printed concrete with a high w/b ratio of 0.6. The proposed approach consists of two stages: 1) introducing monomers as retarders to extend the open time during pumping, and 2) incorporating initiators into the mixture to trigger polymerization, facilitating the structural build-up after deposition by forming polymer bridges between cement particles. We show that the addition of monomers significantly retards yield stress growth, while the following in-situ polymerization engenders a rapid strength development, satisfying the rheological requirements for 3DCP. Mechanistic experiments reveal that the retarding effect results from the complexation of monomers with aqueous species, such as Ca2+ ions, thereby hindering the nucleation of hydrates. As polymerization initiates, the impetus for the structural build-up of the cement pastes first originates from the proliferation of polymer bridges due to the gradual formation and adsorption of polymer, and then relies on the reinforcement of these polymer bridges through the formation of chemical bonds or crosslinks. On top of the environmental benefit, the proposed strategy holds the potential in avoiding admixtures conflict, mitigating early-age shrinkage, and improving mechanical properties. Our strategy opens possibilities for a novel technical route to achieve rheology control of 3DCP, and the discovery in this work will be a landmark for revealing the mechanism of 3DCP via in-situ polymerization.
流变控制是决定三维混凝土打印(3DCP)成功与否的最关键因素,通常通过水泥的水化控制来实现。然而,这不可避免地会导致打印混凝土的过度设计,使其具有较低的水胶比(w/b),这与其非承重目的不符,并引发了一系列环境和耐久性问题,例如高碳足迹和早期年龄收缩。在此,我们提出了一种新型流变控制策略,即通过原位聚合,设计出具有 0.6 高 w/b 比的印花混凝土。建议的方法包括两个阶段:1)引入单体作为缓凝剂,延长泵送过程中的开放时间;2)在混合物中加入引发剂,引发聚合反应,通过在水泥颗粒之间形成聚合物桥,促进沉积后的结构构建。我们的研究表明,单体的加入能显著延缓屈服应力的增长,而随后的原位聚合则能使强度迅速提高,从而满足 3DCP 的流变学要求。机理实验表明,单体与 Ca2+ 离子等水性物质的络合产生了延缓效应,从而阻碍了水合物的成核。随着聚合反应的开始,水泥浆结构形成的动力首先来自于聚合物的逐渐形成和吸附所导致的聚合物桥的增殖,然后依赖于通过形成化学键或交联来加固这些聚合物桥。除了环境效益之外,所提出的策略还能避免与外加剂的冲突、减轻早期收缩并改善机械性能。我们的策略为实现 3DCP 的流变控制开辟了一条新的技术路线,这项工作的发现将成为揭示 3DCP 原位聚合机理的里程碑。
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引用次数: 0
Modelling and experimental study on static yield stress evolution and structural build-up of cement paste in early stage of cement hydration 水泥水化初期水泥浆静屈服应力演变和结构形成的建模和实验研究
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-20 DOI: 10.1016/j.cemconres.2024.107710
Yanliang Ji , Ursula Pott , Alexander Mezhov , Christiane Rößler , Dietmar Stephan
Static yield stress is crucial for concrete, especially for 3D printed concrete, as it determines whether the bottom layer can support the load of the subsequent layers or withstand any potential impulses. A better understanding of the evolution of the static yield stress and its changing mechanism is therefore needed. Under the assumption that hydrate formation follows fractal patterns, this work proposes a model for simulating static yield stress that links the hydration process and bridging possibility. To validate the model, parameters were first obtained from the BNG (Boundary Nucleation Growth) equation fitted with calorimetry data, and the relation of associated hydration rates to sound speed variation rate was analyzed. Results showed that the proposed model predicts well the static yield stress obtained with a penetration test, under varying water-cement ratios and accelerator conditions. The fitted parameter β was found to correlate with size and morphology of the hydration products, suggesting that the model can not only simulate the static yield stress, but also capture the structural build-up information. Furthermore, the decrease in fractal-related β implies that more compact hydrates are formed during hydration.
静态屈服应力对混凝土,尤其是 3D 打印混凝土至关重要,因为它决定了底层能否支撑后续层的负荷或承受任何潜在的冲击。因此,需要更好地了解静屈服应力的演变及其变化机制。根据水合物形成遵循分形模式的假设,本研究提出了一个模拟静屈服应力的模型,该模型将水化过程和架桥可能性联系在一起。为验证该模型,首先根据量热数据拟合 BNG(边界成核增长)方程获得参数,并分析相关水化率与声速变化率的关系。结果表明,在不同的水灰比和促进剂条件下,所提出的模型能很好地预测通过渗透试验获得的静屈服应力。拟合参数 β 与水化产物的尺寸和形态相关,表明该模型不仅能模拟静屈服应力,还能捕捉到结构堆积信息。此外,与分形相关的 β 的减小意味着在水化过程中形成了更紧密的水合物。
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引用次数: 0
A new model for investigating the formation of interfacial transition zone in cement-based materials 研究水泥基材料界面过渡区形成的新模型
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-20 DOI: 10.1016/j.cemconres.2024.107675
Xuan Gao , Qing-feng Liu , Yuxin Cai , Liang-yu Tong , Zesen Peng , Qing Xiang Xiong , Geert De Schutter
The interfacial transition zone (ITZ), located between aggregate and cement paste, has the features of high porosity, low unhydrated cement content, and enrichment of calcium hydroxide crystals (CH) and is often regarded as the weak link in cement-based materials. The present study is devoted to investigating the influence of multiple mechanisms or factors on ITZ formation, including the wall effect, ion transport, and aggregate features. A new modelling system is proposed to assess the interactions between these mechanisms or factors. The time-spatial distribution of hydration products and pores is studied by considering the reaction-diffusion-crystallization process of a non-uniformly distributed cement. Based on the developed model, the effects of individual mechanisms and their interactions on ITZ formation were clarified. The results indicated that the wall effect would determine the spatial distribution of cement and most hydration products due to the repulsion of aggregates on cement particles. The ion transport would influence the time evolution and redistribution of hydration products, which couples with the role of the wall effect. It was also found that aggregate features, including spacing and surface roughness, can affect the distribution of cement and the heterogeneity of cement-based materials, which works synergistically with the wall effect.
界面过渡区(ITZ)位于集料和水泥浆之间,具有孔隙率高、未水化水泥含量低、氢氧化钙晶体(CH)富集等特点,通常被视为水泥基材料的薄弱环节。本研究致力于探讨多种机制或因素对 ITZ 形成的影响,包括壁效应、离子传输和骨料特征。本研究提出了一种新的建模系统来评估这些机制或因素之间的相互作用。通过考虑非均匀分布水泥的反应-扩散-结晶过程,研究了水化产物和孔隙的时间空间分布。根据所建立的模型,阐明了各个机制及其相互作用对 ITZ 形成的影响。结果表明,由于集料对水泥颗粒的排斥作用,壁效应将决定水泥和大多数水化产物的空间分布。离子传输会影响水化产物的时间演化和重新分布,这与壁效应的作用相耦合。研究还发现,集料特征(包括间距和表面粗糙度)会影响水泥的分布和水泥基材料的异质性,这与墙效应协同作用。
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引用次数: 0
Ca/Si-dependent size of silica nanoparticles derived from C-S-H at high water to solid ratio 在高水固比条件下,由 C-S-H 制备的二氧化硅纳米颗粒的尺寸取决于 Ca/Si-
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-20 DOI: 10.1016/j.cemconres.2024.107729
Binmeng Chen , Xu Fang , Yuyang Zhao , Zongjin Li
In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCF with varying calcium to silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remain unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the increased C/S ratio of C-S-H. Since as C/S ratio increased, silicate in Q3 state shifted to Q1 state and the silicate chain became shorter, shifting from long-range, disordered to short-range, ordered. As the disordered self-seeding growth of long silicate chains derived from C-S-H continued, the Si-O-Si network of silica nanoparticles became chaotic, leaving more unreacted Si-OH on its surface. On the contrary, the short silicate chains displayed higher possibility of condensation, making nanoparticles with a smaller diameter.
在回收和再利用建筑垃圾的过程中,通过破坏硅酸钙水合物(C-S-H)结构和硅酸盐链的凝结,已成功地将再生混凝土细料(RCF)碳化用于生产纳米二氧化硅颗粒等高附加值产品。然而,不同钙硅比(C/S)的 RCF 碳化过程的复杂性及其对生成的纳米二氧化硅颗粒尺寸的影响仍然未知。在这项工作中,我们开发了一种优化的高水固比碳化方法,利用不同钙硅比的 C-S-H 制备纳米二氧化硅颗粒。研究发现,随着 C-S-H 的 C/S 比的增加,二氧化硅纳米粒子的粒径逐渐减小。因为随着 C/S 比的增加,Q3 状态的硅酸盐转变为 Q1 状态,硅酸盐链变短,从长程无序转变为短程有序。随着由 C-S-H 衍生的长硅酸盐链的无序自播种生长的继续,二氧化硅纳米粒子的 Si-O-Si 网络变得混乱,在其表面留下了更多未反应的 Si-OH。相反,短硅酸盐链显示出更高的凝结可能性,从而制造出直径更小的纳米粒子。
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引用次数: 0
Expansion of irregularly shaped aggregate induced by alkali-silica reaction: Insights from numerical modeling 碱-二氧化硅反应诱发的不规则形状集料膨胀:数值建模的启示
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-18 DOI: 10.1016/j.cemconres.2024.107727
Lifu Yang, Zhenguo Shi, Kai Li, Xiang Hu, Caijun Shi
This study presents a homogenization approach to understand and simulate the heterogeneous expansion of irregularly shaped aggregate induced by alkali-silica reaction (ASR). The analysis employs a cubic representative volume element (RVE) containing a single reactive aggregate with an arbitrary shape embedded in a mortar matrix. At the aggregate level, ASR expansion is characterized by applying a homogeneous volumetric strain inside the internal structure of the reactive aggregate based on a first-order reaction kinetics. On the RVE scale, ASR expansion is formulated as a series of diffusion processes involving the formation of ASR products and their resulting expansion. By discretizing the RVE, a homogenization approach was proposed to link the homogeneous expansion rate at the aggregate level with the heterogeneous expansion strain at the RVE level. The model captures the heterogeneity of ASR expansion produced by reactive aggregate with arbitrary geometries by assigning anisotropic expansion capacity in different directions as a function of aggregate volume and size. The model was calibrated and validated using experimental data from literature. Results demonstrate that ASR expansion increases with aggregate size in the expansion direction for a given aggregate volume, and also with overall aggregate volume for a constant aggregate size in expansion direction. In addition, the simulations show that ASR-induced cracks in the mortar matrix initially form around the surface of reactive aggregate, particularly along the major axis (the direction of the maximum aggregate length) and around sharp corners of the irregularly shaped aggregate.
本研究提出了一种均质化方法,用于理解和模拟碱硅反应(ASR)诱发的不规则形状骨料的异质膨胀。分析采用了一个立方代表体积元素(RVE),其中包含一个嵌入砂浆基质中的任意形状的单个反应骨料。在骨料层面,根据一阶反应动力学,通过在反应骨料内部结构中施加均匀体积应变来描述 ASR 膨胀。在 RVE 尺度上,ASR 膨胀被表述为一系列涉及 ASR 产物形成及其膨胀的扩散过程。通过对 RVE 进行离散化,提出了一种均质化方法,将集料层面的均质膨胀率与 RVE 层面的异质膨胀应变联系起来。该模型通过将不同方向的各向异性膨胀能力作为骨料体积和尺寸的函数,捕捉了任意几何形状的反应骨料产生的 ASR 膨胀的异质性。利用文献中的实验数据对该模型进行了校准和验证。结果表明,在给定骨料体积的情况下,ASR 的膨胀率随骨料体积在膨胀方向上的增大而增大;在骨料体积不变的情况下,ASR 的膨胀率也随骨料体积在膨胀方向上的增大而增大。此外,模拟结果表明,砂浆基体中由 ASR 引起的裂缝最初形成于活性骨料表面周围,特别是沿主轴(最大骨料长度方向)和不规则形状骨料的尖角周围。
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引用次数: 0
3D microstructural generation from 2D images of cement paste using generative adversarial networks 利用生成式对抗网络从水泥浆二维图像生成三维微观结构
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-16 DOI: 10.1016/j.cemconres.2024.107726
Xin Zhao , Lin Wang , Qinfei Li , Heng Chen , Shuangrong Liu , Pengkun Hou , Jiayuan Ye , Yan Pei , Xu Wu , Jianfeng Yuan , Haozhong Gao , Bo Yang
Establishing a realistic three-dimensional (3D) microstructure is a crucial step for studying microstructure development of hardened cement pastes. However, acquiring 3D microstructural images for cement often involves high costs and quality compromises. This paper proposes a generative adversarial networks-based method for generating 3D microstructures from a single two-dimensional (2D) image, capable of producing high-quality and realistic 3D images at low cost. In the method, a framework (CEM3DMG) is designed to synthesize 3D images by learning microstructural information from a 2D cross-sectional image. Experimental results show that CEM3DMG can generate realistic 3D images of large size. Visual observation confirms that the generated 3D images exhibit similar microstructural features to the 2D images, including similar pore distribution and particle morphology. Furthermore, quantitative analysis reveals that reconstructed 3D microstructures closely match the real 2D microstructure in terms of gray level histogram, phase proportions, and pore size distribution.
建立逼真的三维(3D)微观结构是研究硬化水泥浆微观结构发展的关键步骤。然而,获取水泥的三维微观结构图像往往需要高昂的成本和质量上的妥协。本文提出了一种基于生成对抗网络的方法,用于从单张二维(2D)图像生成三维微观结构,能够以低成本生成高质量、逼真的三维图像。该方法设计了一个框架(CEM3DMG),通过学习二维横截面图像中的微结构信息来合成三维图像。实验结果表明,CEM3DMG 可以生成逼真的大尺寸三维图像。肉眼观察证实,生成的三维图像显示出与二维图像相似的微观结构特征,包括相似的孔隙分布和颗粒形态。此外,定量分析显示,重建的三维微观结构在灰度直方图、相比例和孔径分布方面与真实的二维微观结构非常接近。
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引用次数: 0
Unveiling the key factors for clinker reactivity and cement performance: A physic-chemical and performance investigation of 40 industrial clinkers 揭示熟料反应性和水泥性能的关键因素:40 种工业熟料的物理化学和性能调查
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-14 DOI: 10.1016/j.cemconres.2024.107717
J.S. Andrade Neto , I.C. Carvalho , P.J.M. Monteiro , P.R. de Matos , A.P. Kirchheim
This study assessed 40 industrial clinkers from 16 cement plants, determining their physical, chemical, and mineralogical properties and the corresponding cements' strength development and hydration kinetics. Pearson's statistical analysis identified key factors influencing clinker and cement properties. Clinker composition ranged within 56.5–73.9% C₃S, 4.1–24.5% C₂S, 0.8–8.4% C₃A, and 7.4–13.9% C₄AF. The sulfate-alkali ratio significantly impacted C₃A content and polymorphism. Alite crystal size was directly influenced by the CaO content and the sulfate-alkali ratio and inversely by the MgO, K₂O, and F contents. Clinker grindability was directly affected by the C₃S crystal size and the sulfate-alkali ratio while inversely impacted by the MgO and K₂O contents. Key parameters for early cement hydration included fineness and K₂O content (positive) and C₃S crystal size (negative); larger C3S crystal size negatively affected cement early strength, while MnO2 and K2O presence improved 1-day strength. For 28-day strength, increasing cement fineness and K2O content were detrimental.
本研究评估了来自 16 家水泥厂的 40 种工业熟料,确定了它们的物理、化学和矿物学特性以及相应水泥的强度发展和水化动力学。皮尔逊统计分析确定了影响熟料和水泥性能的关键因素。熟料成分范围为 56.5-73.9% C₃S、4.1-24.5% C₂S、0.8-8.4% C₃A、7.4-13.9% C₄AF。硫酸-碱比例对 C₃A 含量和多态性有显著影响。白云石晶体大小受 CaO 含量和硫酸盐-碱比率的直接影响,与 MgO、K₂O 和 F- 含量成反比。熟料可磨性受 C₃S 结晶粒度和硫酸-碱比率的直接影响,而与 MgO 和 K₂O 含量成反比。水泥早期水化的关键参数包括细度和 K₂O 含量(正向)以及 C₃S 结晶尺寸(负向);较大的 C3S 结晶尺寸对水泥早期强度有负面影响,而 MnO2 和 K2O 的存在则提高了 1 天强度。对于 28 天强度而言,水泥细度和 K2O 含量的增加是不利的。
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引用次数: 0
3D crystalline phase and pore structure evolution upon CO2 exposure in sodium sulfate-activated cement pastes 硫酸钠活化水泥浆暴露于二氧化碳时的三维晶相和孔隙结构演变
IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-11 DOI: 10.1016/j.cemconres.2024.107716
Zengliang Yue , Zixian Su , Partha P. Paul , Alastair T.M. Marsh , Alice Macente , Marco Di Michiel , John L. Provis , Philip J. Withers , Susan A. Bernal
The effects of CO2 exposure on sodium sulfate-activated blast furnace slag cement paste have been characterised by X-ray (attenuation) computed tomography revealing changes in micron-scale pore structure, and X-ray diffraction computed tomography (XRD-CT) elucidating changes in the spatial distribution of crystalline and semi-crystalline phases. Accelerated carbonation reduced ettringite volumes and induced formation of hydrotalcite, demonstrating the critical role of Mg-Al-SO4-layered double hydroxide phases in the CO2 uptake of these cements. These changes yield a refinement of small pores and increase the overall porosity, reaching values comparable to those of blended Portland cements. Formation factor values were determined considering the pore solution electrical resistivity, calculated from thermodynamic modelling, and the porosity. A correlation between simulated tortuosity and porosity is proposed to estimate the diffusion tortuosity and formation factor of sodium sulfate-activated slag pastes. This approach represents a significant step forward for assessing carbonation resistance and CO2 uptake capacity of cementitious pastes.
通过 X 射线(衰减)计算机断层扫描(XRD-CT)和 X 射线衍射计算机断层扫描(XRD-CT)分析了二氧化碳暴露对硫酸钠活化高炉矿渣水泥浆的影响,前者揭示了微米级孔隙结构的变化,后者阐明了结晶和半结晶相空间分布的变化。加速碳化减少了埃特林岩的体积,并诱导形成了水滑石,证明了 Mg-Al-SO4 层状双氢氧化物相在这些水泥的二氧化碳吸收过程中起着关键作用。这些变化细化了小孔并增加了整体孔隙率,达到了与混合波特兰水泥相当的数值。根据热力学模型计算出的孔隙溶液电阻率和孔隙率确定了形成因子值。提出了模拟迂回度和孔隙率之间的相关性,以估算硫酸钠活化矿渣浆的扩散迂回度和形成系数。这种方法在评估水泥浆的碳化阻力和二氧化碳吸收能力方面迈出了重要一步。
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引用次数: 0
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