Cement and Concrete Research最新文献_第4页

Plugging effect of fine pore water in OPC and LC3 paste during accelerated carbonation monitored via single-sided nuclear magnetic resonance spectroscopy 通过单面核磁共振波谱监测加速碳化过程中 OPC 和 LC3 浆料中细小孔隙水的堵塞效应

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-10-08 DOI: 10.1016/j.cemconres.2024.107688

Luge Cheng , Ryo Kurihara , Takahiro Ohkubo , Ryoma Kitagaki , Atsushi Teramoto , Yuya Suda , Ippei Maruyama

引用次数: 0

New insights on the basic creep mechanism of one-part alkali activated slag and fly ash paste 关于单组分碱激活炉渣和粉煤灰浆基本蠕变机理的新见解

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-10-08 DOI: 10.1016/j.cemconres.2024.107691

Han Gao , Igor Shikhov , Ehab Hamed , Ailar Hajimohammadi , Iman Al-Damad , Christoph Arns , Stephen J. Foster

引用次数: 0

Insights on the mechanical properties and failure mechanisms of calcium silicate hydrates based on deep-learning potential molecular dynamics 基于深度学习潜在分子动力学的硅酸钙水合物力学性能和失效机理透视

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-10-02 DOI: 10.1016/j.cemconres.2024.107690

Weihuan Li , Chenchen Xiong , Yang Zhou , Wentao Chen , Yangzezhi Zheng , Wei Lin , Jiarui Xing

{"title":"Insights on the mechanical properties and failure mechanisms of calcium silicate hydrates based on deep-learning potential molecular dynamics","authors":"Weihuan Li , Chenchen Xiong , Yang Zhou , Wentao Chen , Yangzezhi Zheng , Wei Lin , Jiarui Xing","doi":"10.1016/j.cemconres.2024.107690","DOIUrl":"10.1016/j.cemconres.2024.107690","url":null,"abstract":"<div><div>The molecular-scale mechanical properties of calcium silicate hydrates are crucial to the macro performance of cementitious materials, while achieving coincidence between accuracy and efficiency in computational simulations still remains a challenge. This study utilizes a deep-learning potential, specifically developed for calcium silicate hydrates based on artificial neural network, to achieve molecular dynamics simulations with accuracy comparable to first-principle methods. With this potential, the elastic properties and uniaxial mechanical behaviors are explored, wherein the anisotropy and impact mechanism of calcium ratios are analyzed. The results add to evidence that the deep-learning potential possess a higher accuracy than common force fields. The anisotropy of elastic modulus is mainly attributed to different atomic interactions in various directions, while the anisotropy of strength is additionally affected by the form of failure. This study may advance the accurate molecular-scale simulation and deepen the understanding of the strength source and cohesion mechanism of cement-based materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107690"},"PeriodicalIF":10.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369632","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

Importance of adsorption compared with complexation for retarding C3S hydration via adding sodium gluconate 在通过添加葡萄糖酸钠延缓 C3S 水化方面，吸附作用与络合作用相比具有重要意义

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-10-02 DOI: 10.1016/j.cemconres.2024.107686

Guitao Luo , Muyu Liu , Hua Li , Yang Liu , Hongbo Tan , Qimin Liu

{"title":"Importance of adsorption compared with complexation for retarding C3S hydration via adding sodium gluconate","authors":"Guitao Luo , Muyu Liu , Hua Li , Yang Liu , Hongbo Tan , Qimin Liu","doi":"10.1016/j.cemconres.2024.107686","DOIUrl":"10.1016/j.cemconres.2024.107686","url":null,"abstract":"<div><div>Adsorption effect on particle surfaces and complexation effect with free Ca<sup>2+</sup> mostly determine the retarding performance of organic admixtures on cement hydration. However, it is difficult to identify which effect plays a more important role in retarding hydration by experimental methods. Here, a theoretical model was developed to investigate the retarding mechanisms of sodium gluconate (SG) on hydration of tricalcium silicate (C<sub>3</sub>S). Based on obstruction theory and complexation reaction kinetics, effects of adsorption and complexation were simulated to examine the retarding performance of C<sub>3</sub>S hydration with addition of SG. The proposed model well predicted the effect of additional dosing of SG on the retarding performance of C<sub>3</sub>S hydration. Theoretical parameter studies demonstrated that adsorption ratio contributed much largely to the delays in C<sub>3</sub>S hydration, compared with rate constant of complex generation. Therefore, it is confirmed that adsorption plays a more important role in regulating the retarding mechanism of C<sub>3</sub>S hydration.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107686"},"PeriodicalIF":10.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369637","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

Packing properties assessment of cement and alternative powders: Artefacts and protocols 水泥和替代粉料的填料特性评估：工件和规程

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-28 DOI: 10.1016/j.cemconres.2024.107685

Hela Bessaies-Bey , Xiaohan Yu , Wenqiang Zuo , Oumayma Ahmadah , Janine Deou , Laura Caneda-Martínez , Nicolas Roussel

引用次数: 0

Experimental investigation of the impact of additives in low clinker cementitious materials on multi-ion transference numbers and diffusion coefficients 低熟料胶凝材料中添加剂对多离子转移数和扩散系数影响的实验研究

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-26 DOI: 10.1016/j.cemconres.2024.107687

Rachid Cherif , Carmen Andrade , Abdelkarim Aït-Mokhtar

{"title":"Experimental investigation of the impact of additives in low clinker cementitious materials on multi-ion transference numbers and diffusion coefficients","authors":"Rachid Cherif , Carmen Andrade , Abdelkarim Aït-Mokhtar","doi":"10.1016/j.cemconres.2024.107687","DOIUrl":"10.1016/j.cemconres.2024.107687","url":null,"abstract":"<div><div>In this paper, multi-ion transference numbers were determined throughout the chloride migration testing of low clinker cement-based materials. For this purpose, five cement pastes were studied: pure Portland paste (as a reference) and four other pastes, based on limestone filler, fly ash, slag or silica fume. The transference numbers were calculated from the concentration evolution in the three zones of the migration cell (catholyte, anolyte and sample), considering that: (i) ions moved in the catholyte and anolyte; (ii) ions leached from the sample; (iii) ions were generated from the electrode processes, and (iv) the pore solution of the sample evolved during the test. The chloride transference numbers of pastes with pure Portland cement, limestone filler, fly ash, slag or silica fume are almost zero at the beginning of the migration test but 0.23; 0.18; 0.06; 0.05 and 0.20 at the end of the test, respectively. The ion transference numbers obtained were used for the calculation of diffusion coefficients of chlorides, sodium and potassium using the Nernst-Einstein equation.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107687"},"PeriodicalIF":10.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322770","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

Tensile strength and failure mechanism of rock–cement sample: Roles of curing temperature, nano-silica and rock type 岩石-水泥样品的拉伸强度和破坏机理：固化温度、纳米二氧化硅和岩石类型的作用

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-25 DOI: 10.1016/j.cemconres.2024.107673

Rongwei Yang , Shan He , Junyao Liu , Jiyun Shen , Linlin Wang , Yongjin Yu , Dongwei Hou

{"title":"Tensile strength and failure mechanism of rock–cement sample: Roles of curing temperature, nano-silica and rock type","authors":"Rongwei Yang , Shan He , Junyao Liu , Jiyun Shen , Linlin Wang , Yongjin Yu , Dongwei Hou","doi":"10.1016/j.cemconres.2024.107673","DOIUrl":"10.1016/j.cemconres.2024.107673","url":null,"abstract":"<div><div>Understanding the tensile strength and failure mechanism of rock–cement interfacial transition zone (ITZ) is of vital significance to the sealing integrity of cement sheath under downhole condition. Taking advantage of multiple techniques, i.e., digital image correlation (DIC), nano-indentation, XRD-Rietveld analysis, <span><math><mrow><msup><mrow></mrow><mrow><mn>29</mn></mrow></msup><mtext>Si</mtext></mrow></math></span> MAS solid NMR, and SEM-EDX, this study is devoted to investigating the impacts of curing temperature, rock type, and the addition of nano-silica (NS), on the tensile strength and failure mechanism of rock–cement sample. The experimental results show that both the curing temperature and the addition of NS leads to the formation of more C-S-H, which densifies the ITZ microstructure and responsible for high tensile strength of rock–cement samples; the tensile strengths of shale-cement samples are consistently higher than those of sandstone-cement sample; the crack velocities for rock–cement samples under three-point bending tests are approximately 1 mm/s, the crack velocities for rock–cement samples are slowed down when the NS is incorporated in cement paste, but they are independent on the rock type and curing temperature.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107673"},"PeriodicalIF":10.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319669","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

Shrinkage reduction mechanism of low Ca/Si ratio C-A-S-H in cement pastes containing fly ash 含粉煤灰水泥浆中低 Ca/Si 比 C-A-S-H 的收缩减少机理

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-25 DOI: 10.1016/j.cemconres.2024.107683

Miki Segawa , Ryo Kurihara , Abudushalamu Aili , Go Igarashi , Ippei Maruyama

{"title":"Shrinkage reduction mechanism of low Ca/Si ratio C-A-S-H in cement pastes containing fly ash","authors":"Miki Segawa , Ryo Kurihara , Abudushalamu Aili , Go Igarashi , Ippei Maruyama","doi":"10.1016/j.cemconres.2024.107683","DOIUrl":"10.1016/j.cemconres.2024.107683","url":null,"abstract":"<div><div>Understanding the drying shrinkage of low Ca/Si ratio cement pastes is crucial for promoting the use of low-clinker ratio cementitious materials and reducing the environmental impact of cement production. We prepared well-hydrated cement paste samples with various fly ash replacement and water-to-cement ratios. The long-term drying shrinkage was measured by 1 mm-thick samples. Results showed that fly ash containing samples exhibited lower shrinkage and the irreversible part of drying shrinkage was less compared to those without fly ash. Chemical composition analysis of the calcium aluminate-silicates hydrate (C-A-S-H) was conducted using X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). Additionally, water vapor sorption isotherms and proton nuclear magnetic resonance (<sup>1</sup>H NMR) relaxometry were used to determine specific surface area and pore structure. By analyzing these results in conjunction with the C-A-S-H model, we attributed the reduced and more reversible drying shrinkage in fly ash cement to lower Ca ion amounts in the interlayer space and fewer trapped larger pores.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107683"},"PeriodicalIF":10.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interaction of reinforcement, process, and form in Digital Fabrication with Concrete 混凝土数字制造中钢筋、工艺和形式的相互作用

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-25 DOI: 10.1016/j.cemconres.2024.107640

Harald Kloft , Bartłomiej Sawicki , Freek Bos , Robin Dörrie , Niklas Freund , Stefan Gantner , Lukas Gebhard , Norman Hack , Egor Ivaniuk , Jacques Kruger , Walter Kaufmann , Jaime Mata-Falcón , Viktor Mechtcherine , Ammar Mirjan , Rob Wolfs , Dirk Lowke

{"title":"Interaction of reinforcement, process, and form in Digital Fabrication with Concrete","authors":"Harald Kloft , Bartłomiej Sawicki , Freek Bos , Robin Dörrie , Niklas Freund , Stefan Gantner , Lukas Gebhard , Norman Hack , Egor Ivaniuk , Jacques Kruger , Walter Kaufmann , Jaime Mata-Falcón , Viktor Mechtcherine , Ammar Mirjan , Rob Wolfs , Dirk Lowke","doi":"10.1016/j.cemconres.2024.107640","DOIUrl":"10.1016/j.cemconres.2024.107640","url":null,"abstract":"<div><div>Material, manufacturing process, and form are mutually dependent. In formwork-based concrete construction, the reinforcement must be positioned and fixed in the formwork, limiting material efficiency and freedom of form. In Digital Fabrication with Concrete (DFC), the formwork no longer limits the concrete forming process. Furthermore, the reinforcement no longer must be installed in advance, but can be placed before, during or after the concrete application. Therefore, the role of reinforcement and its interaction with processing must be fundamentally rethought in DFC. Furthermore, with reinforcement integration a concrete component expands from a contour-based shape into a structural form.</div><div>The current paper proposes a new so-called RPF-framework expressing the interaction of reinforcement, process and form in DFC. The application of this framework is illustrated using current examples of DFC, whose structural forms are critically discussed. Finally, the need for a holistic approach to material, process and form in DFC is emphasised.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107640"},"PeriodicalIF":10.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defective homes in Donegal, Ireland: Effect of exposure conditions and concrete quality on pyrrhotite oxidation and internal sulfate attack 爱尔兰多尼戈尔有缺陷的房屋：暴露条件和混凝土质量对黄铁矿氧化和内部硫酸盐侵蚀的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-09-24 DOI: 10.1016/j.cemconres.2024.107684

Andreas Leemann , Beat Münch , Barbara Lothenbach , Frank Winnefeld , Paul Dunlop

{"title":"Defective homes in Donegal, Ireland: Effect of exposure conditions and concrete quality on pyrrhotite oxidation and internal sulfate attack","authors":"Andreas Leemann , Beat Münch , Barbara Lothenbach , Frank Winnefeld , Paul Dunlop","doi":"10.1016/j.cemconres.2024.107684","DOIUrl":"10.1016/j.cemconres.2024.107684","url":null,"abstract":"<div><div>Thousands of homes in County Donegal, Ireland, built from concrete blocks, are damaged by extensive cracks and crumbling that occurred a few years after construction. Recently, research has shown that pyrrhotite oxidation triggering internal sulfate attack (ISA) is the cause. In this study, samples from the strip foundations, the rising blocks, the outer and inner leaf of one undamaged reference home and three affected homes are investigated. As these four structural components differ by concrete quality, exposure condition or both, their effect on ISA is investigated. All three damaged homes contained pyrrhotite in the aggregates, while it was absent in the reference home. ISA in the foundations is in an initial state. It has progressed further in the rising blocks and is most advanced in the outer leaf. Whilst carbonation limits the effects of ISA in the inner leaf, further pyrrhotite oxidation will create expansion leading to ongoing deterioration.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"186 ","pages":"Article 107684"},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0008884624002655/pdfft?md5=375687d8aace006feb723f9aabd5dcd9&pid=1-s2.0-S0008884624002655-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0