Cement and Concrete Research最新文献_第3页

UR2: Ultra-rapid reactivity test for real-time, low-cost quality control of calcined clays

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-10 DOI: 10.1016/j.cemconres.2025.107806

Yujia Min, Hossein Kabir, Chirayu Kothari, M. Farjad Iqbal, Nishant Garg

引用次数: 0

The interaction mechanism of polycarboxylate and β-naphthalene sulfonate superplasticizers: Synergistic adsorption rather than competitive adsorption

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-10 DOI: 10.1016/j.cemconres.2025.107811

Tianfeng Zhou , Haotian Duan , Beibei Li , Yuxia Pang , Hongming Lou , Dongjie Yang , Xueqing Qiu

{"title":"The interaction mechanism of polycarboxylate and β-naphthalene sulfonate superplasticizers: Synergistic adsorption rather than competitive adsorption","authors":"Tianfeng Zhou , Haotian Duan , Beibei Li , Yuxia Pang , Hongming Lou , Dongjie Yang , Xueqing Qiu","doi":"10.1016/j.cemconres.2025.107811","DOIUrl":"10.1016/j.cemconres.2025.107811","url":null,"abstract":"<div><div>The challenge of compatibility between polycarboxylate superplasticizer (PCE) and β-naphthalene sulfonate superplasticizer (BNS) remains an enduring puzzle, requiring a comprehensive understanding of their interaction mechanism. In our study, the macroscopic properties, microscopic interfacial adsorption, and intermolecular forces are investigated in detail to elucidate the interaction between PCE and BNS. The results show that the dispersing ability of PCE and BNS decreases under different blending sequences. The increased adsorption of the blended superplasticizers indicates that PCE and BNS undergo synergistic adsorption on the surface of cement particles rather than competitive adsorption. Atomic force microscopy reveals a shift in the intermolecular forces of the blended superplasticizers from repulsion to attraction, including CH-π interactions and hydrophobic interactions. BNS adsorption on the PCE side chain results in the bending and collapse of the latter, which prevents PCE from providing steric hindrance. Moreover, PCE side chains wrap around BNS molecules, reducing the absolute value of zeta potential of cement particles' surfaces. The study, conducted through both experimental and theoretical methods, provides evidence that attractive forces between PCE and BNS have a disruptive influence on the original molecular structure.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"191 ","pages":"Article 107811"},"PeriodicalIF":10.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375811","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

A new approach for constructing UHPC conductive pathways: Oriented deposition of conductive hydration products

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-10 DOI: 10.1016/j.cemconres.2025.107827

Minjie Jia , Xiangyi Chen , Zhichao Xu , Juncheng Wen , Yingzi Yang , Kunyang Yu , Yushi Liu

{"title":"A new approach for constructing UHPC conductive pathways: Oriented deposition of conductive hydration products","authors":"Minjie Jia , Xiangyi Chen , Zhichao Xu , Juncheng Wen , Yingzi Yang , Kunyang Yu , Yushi Liu","doi":"10.1016/j.cemconres.2025.107827","DOIUrl":"10.1016/j.cemconres.2025.107827","url":null,"abstract":"<div><div>Regulating the resistivity of ultra-high-performance concrete (UHPC) infrastructure is crucial for endowing UHPC with intelligence and multifunctionality. In this study, we proposed a new approach to enhance the electrical conductivity of UHPC via high-temperature electric induction. When the temperature of electric-cured UHPC was heated to 90–130 °C, the resistivity dropped sharply. After electric curing, the resistivity of UHPC was significantly reduced from 8.7 MΩ·cm to 537.18 Ω·cm compared to that of steam-cured UHPC. It was confirmed that the tunneling effect and dielectric breakdown were the main reasons for the sudden resistivity drop during electric curing. Moreover, electrochemical impedance spectroscopy (EIS) and model experiments revealed the oriented deposition of new conductive products within the UHPC matrix. This approach also strengthened UHPC in 3 h comparable to 3-day steam curing of 90 °C. This work opened up a novel path in constructing effective conductive networks of cement-based materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"191 ","pages":"Article 107827"},"PeriodicalIF":10.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375812","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

Grain-scale stress heterogeneity in concrete from in-situ X-ray measurements

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-08 DOI: 10.1016/j.cemconres.2025.107789

Mohmad M. Thakur , N. Axel Henningsson , Jonas Engqvist , Pierre-Olivier Autran , Jonathan P. Wright , Ryan C. Hurley

{"title":"Grain-scale stress heterogeneity in concrete from in-situ X-ray measurements","authors":"Mohmad M. Thakur , N. Axel Henningsson , Jonas Engqvist , Pierre-Olivier Autran , Jonathan P. Wright , Ryan C. Hurley","doi":"10.1016/j.cemconres.2025.107789","DOIUrl":"10.1016/j.cemconres.2025.107789","url":null,"abstract":"<div><div>Concrete features significant microstructural heterogeneity which affects its mechanical behavior. Strain localization in the matrix phase of concrete has received significant attention due to its relation to microcracking and our ability to quantify it with X-ray computed tomography (XRCT). In contrast, stresses in sand and aggregates remain largely unmeasured but remain critical for micromechanics-based theories of failure. Here, we use a combination of <em>in-situ</em> XRCT, 3D X-ray diffraction (3DXRD), and scanning 3DXRD to directly measure strain and stress within sand grains in two samples of mortar containing different sand volume fractions. Our results reveal that, in contrast to inclusion theories from continuum micromechanics, aggregates feature a broad distribution of average stresses and significant gradients in their internal stress fields. Our work furnishes the first known dataset with these quantitative stress measurements and motivates improvements in micromechanics models for concrete which can capture stress heterogeneity.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"190 ","pages":"Article 107789"},"PeriodicalIF":10.9,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349455","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

Mechanical behavior of concrete under high water pressure: Water penetration as a critical factor for mechanical properties

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-08 DOI: 10.1016/j.cemconres.2025.107820

Atichon Kunawisarut , Yuichiro Kawabata , Mitsuyasu Iwanami

引用次数: 0

New insight into the effects of silane-modified silica fume on the performance of cement pastes 硅烷改性硅灰对水泥浆性能影响的新见解

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-06 DOI: 10.1016/j.cemconres.2025.107818

Yanrong Zhang , Xuesong Zhang , Zichen Lu , Kai Wu , Xiaopei Cai

{"title":"New insight into the effects of silane-modified silica fume on the performance of cement pastes","authors":"Yanrong Zhang , Xuesong Zhang , Zichen Lu , Kai Wu , Xiaopei Cai","doi":"10.1016/j.cemconres.2025.107818","DOIUrl":"10.1016/j.cemconres.2025.107818","url":null,"abstract":"<div><div>Hydrophobic-modified silica fume (HSF) with superior dispersion was synthesized by coating silane onto SF surface. Its influence on cement hydration, microstructure and properties of cement pastes was investigated. Results indicated that the silane on SF surface visibly depressed pozzolanic reaction at early ages. HSF retarded cement hydration by adsorbing on cement surface and more importantly, by interacting with Ca<sup>2+</sup> in aqueous phase. For the first time, the accumulation of calcium around HSF was observed, leading to the growth of needle-like C–S–H perpendicular to HSF surface and eventually evolved into loose honeycomb-like gels. These loose gels promoted pozzolanic reaction and cement hydration at late ages. TEM and XRD results revealed that silane incorporated itself into C–S–H and altered structural order. Furthermore, adding HSF increased capillary pore size but refined the inter-hydrate pores at late ages. HSF visibly decreased the compressive strength compared with SF; however, the difference diminished at late ages.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"190 ","pages":"Article 107818"},"PeriodicalIF":10.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143191860","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

Heating-induced transformations in calcium silicate hydrate (C-S-H): In-situ investigations of composition, structure, and morphology

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-04 DOI: 10.1016/j.cemconres.2025.107819

Yuefeng Ma , Ming Jin , Fei Wang , Diederik Jacques , Xuyan Shen , Jian Zhang , Chang Gao , Haoyu Zeng , Jingwen Liu , Jiaping Liu

{"title":"Heating-induced transformations in calcium silicate hydrate (C-S-H): In-situ investigations of composition, structure, and morphology","authors":"Yuefeng Ma , Ming Jin , Fei Wang , Diederik Jacques , Xuyan Shen , Jian Zhang , Chang Gao , Haoyu Zeng , Jingwen Liu , Jiaping Liu","doi":"10.1016/j.cemconres.2025.107819","DOIUrl":"10.1016/j.cemconres.2025.107819","url":null,"abstract":"<div><div>Transformation of C-S-H is crucial in the deterioration of concrete at high temperatures. This study investigates the composition, structure, and morphology of C-S-H from 30 °C to 1000 °C using in-situ heating XRD, TGA/TG-IR, in-situ heating XPS, and in-situ heating TEM combined with image recognition. The results reveal that during heating, C-S-H undergoes weakly and strongly bound water loss, dehydroxylation, and transformation into CaSiO<sub>3</sub>. During heating, the Si-O-Si bonds within C-S-H silicate chains remain highly stable. The primary change observed is the conversion of Si-OH groups into Si-O-Ca/Na following dehydroxylation. TEM morphology exhibits shrinkage and densification similar to ceramic sintering, with the overall process divided into five stages. The first three stages are dominated by dehydration and dehydroxylation, while the final two stages are governed by phase changes and liquid-phase sintering. The dehydration of C-S-H in the first stage has the greatest impact on shrinkage, while the fourth stage transforms the C-S-H morphology from foil-like to drop-like, having the largest effect on densification. Although the Ca/Si ratio of C-S-H remains constant during the heating, the crystallinity decreases. This study offers new insights into the mechanisms driving the transformation of C-S-H under heating.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"190 ","pages":"Article 107819"},"PeriodicalIF":10.9,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083781","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

Numerical investigation of mechanisms affecting alkali-silica reaction advancement by reactive transport simulations

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-03 DOI: 10.1016/j.cemconres.2025.107791

Lucie Gomez , Frédéric Perales , Stéphane Multon , Adrien Socié , Benoit Fournier , Matthieu Argouges

引用次数: 0

Numerical modeling of unidirectional sulfate attack on tunnel lining concrete considering water evaporation at free face 考虑自由面水分蒸发的隧道衬砌混凝土单向硫酸盐侵蚀数值模拟

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-03 DOI: 10.1016/j.cemconres.2025.107813

Zirui Fan , Dujian Zou , Ming Zhang , Shanshan Qin , Tiejun Liu

{"title":"Numerical modeling of unidirectional sulfate attack on tunnel lining concrete considering water evaporation at free face","authors":"Zirui Fan , Dujian Zou , Ming Zhang , Shanshan Qin , Tiejun Liu","doi":"10.1016/j.cemconres.2025.107813","DOIUrl":"10.1016/j.cemconres.2025.107813","url":null,"abstract":"<div><div>Severe scaling and spalling are commonly observed on tunnel lining surfaces in sulfate-rich environments. Due to humidity gradients, sulfate solution in rock fissures migrates through capillary action to the concrete exposed face, leading to physical crystallization precipitation at free-face zone and chemical sulfate attack at soil-facing zone, resulting in concrete expansion and crack. Existing models focus on full immersion or wet-dry cycles, which have obvious errors in predicting concrete damage under similar partial immersion. Considering the time-varying characteristics of saturation, porosity, calcium leaching and crack, a transport-reaction-expansion model for lining concrete under dual sulfate attacks and water evaporation was established. The spatiotemporal distribution of phase composition and the influence of modeling parameters on concrete expansion were revealed. The expansion strain caused by dual sulfate attacks and changes in the water evaporation zone was discussed. These findings provide a theoretical foundation for the durability design of lining concrete in sulfate-rich environment.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"190 ","pages":"Article 107813"},"PeriodicalIF":10.9,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077299","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

New insight into self-antifoaming effect of entrained CO2 bubbles in fresh cement paste 对新拌水泥浆中夹带的二氧化碳气泡的自消泡效应的新认识

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-03 DOI: 10.1016/j.cemconres.2025.107815

Suhui Zhang , Min Liu , Keren Zheng , Lou Chen , Caijun Shi , Qiang Yuan

{"title":"New insight into self-antifoaming effect of entrained CO2 bubbles in fresh cement paste","authors":"Suhui Zhang , Min Liu , Keren Zheng , Lou Chen , Caijun Shi , Qiang Yuan","doi":"10.1016/j.cemconres.2025.107815","DOIUrl":"10.1016/j.cemconres.2025.107815","url":null,"abstract":"<div><div>A new insight into self-antifoaming effect of CO<sub>2</sub> bubble was proposed by exploring the evolution of entrained CO<sub>2</sub> bubbles in fresh cement paste. The disappearance process of CO<sub>2</sub> bubbles was observed, resulting in the reduction of air content. The evolution of CO<sub>2</sub> bubbles eventually formed two kinds of pore structures: hollow spherical shell structure (HSS) and interior filled spherical shell structure (IFSS). It was evidenced by the rich area of CaCO<sub>3</sub> at the outline of CO<sub>2</sub> bubble and the interior formation of hydration products. Meanwhile, self-antifoaming effect of CO<sub>2</sub> bubble promoted the microstructural build-up of fresh cement paste and enhanced the mechanical property of hardened cement paste. Fresh cement paste with CO<sub>2</sub> bubbles had stronger elasticity and higher volume resistance, corresponding to the faster rise of storage modulus. The compressive strength of hardened cement paste was increased from 29.6 MPa to 37.3 MPa with a porosity reduction of 6%.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"190 ","pages":"Article 107815"},"PeriodicalIF":10.9,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077300","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