Cement and Concrete Research最新文献_第4页

Revisiting MgO reactivity: The critical role of mesopores and surface defects of particles 重述氧化镁的反应性：颗粒的介孔和表面缺陷的关键作用

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-16 DOI: 10.1016/j.cemconres.2025.108118

Jiaze Wang , Hangjie Zhou , Yufeng Song , Chengzhuo Xie , Cise Unluer , Shaoqin Ruan

{"title":"Revisiting MgO reactivity: The critical role of mesopores and surface defects of particles","authors":"Jiaze Wang , Hangjie Zhou , Yufeng Song , Chengzhuo Xie , Cise Unluer , Shaoqin Ruan","doi":"10.1016/j.cemconres.2025.108118","DOIUrl":"10.1016/j.cemconres.2025.108118","url":null,"abstract":"<div><div>The reactivity of magnesia (MgO) is a critical determinant of the performance of magnesia-based cements. While conventional theory correlates MgO reactivity primarily with specific surface area (SSA), this study utilizes a multi-technique approach to reveal a more complex dependency governed by the interplay between pore structure and surface defect density. Through controlled synthesis of MgO from calcinating Mg(OH)<sub>2</sub> at 400, 500, and 600 °C for 2 h, we demonstrate that the sample calcined at 500 °C (S5–2) exhibits the highest reactivity, despite possessing a lower SSA than the 400 °C counterpart. A multi-technique approach, combining TEM, in-situ XRD, BET, LF-NMR, XPS, PL, and ESR analyses, reveals that this enhanced reactivity is strongly correlated with a synergistic combination of a favorable mesoporous architecture (~10–100 nm), hypothesized to facilitate efficient water transport, and a maximized concentration of surface oxygen vacancies, which are believed to promote hydrolysis. This perspective supplements existing theory and provides guidance for designing magnesia cements with stable and reproducible performance, addressing one of the major challenges in this field.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108118"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797702","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

Multi-scale mechanical behaviors of ultra-high performance fiber-reinforced concrete influenced by ultra-fine mineral additives: A hierarchical perspective on toughness gain modulation 超细矿物添加剂对超高性能纤维增强混凝土多尺度力学行为的影响：韧性增益调节的分层视角

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-03 DOI: 10.1016/j.cemconres.2025.108099

Qiaomu Zheng , En-Hua Yang , Chen Li , Qiang Ren , Hongen Zhang , Wenting Li , Sifan Zhang , Zhengwu Jiang

{"title":"Multi-scale mechanical behaviors of ultra-high performance fiber-reinforced concrete influenced by ultra-fine mineral additives: A hierarchical perspective on toughness gain modulation","authors":"Qiaomu Zheng , En-Hua Yang , Chen Li , Qiang Ren , Hongen Zhang , Wenting Li , Sifan Zhang , Zhengwu Jiang","doi":"10.1016/j.cemconres.2025.108099","DOIUrl":"10.1016/j.cemconres.2025.108099","url":null,"abstract":"<div><div>Enhancing the toughness gain of ultra-high performance fiber-reinforced concrete (UHPFRC) through fundamental unit (e.g., nanostructure) optimization remains a challenge. This work explores the multi-scale mechanical behaviors of UHPFRC under four-point flexural loads, incorporating silica fume (SF) and ultra-fine fly ash (UFFA) as the ultra-fine mineral additives. SF and UFFA promote the formation of C(<em>A</em>)SH with high Si/Ca and Al/Ca ratio, altering the structural characteristics of both cement matrix and fiber-matrix interface. At the nanoscale, SF enhances the C(<em>A</em>)SH modulus through higher cohesion force, while UFFA elevates its friction coefficient; although both additives decrease C(<em>A</em>)SH hardness by reduced intrinsic modulus, their synergism improves C(<em>A</em>)SH stiffness. At the micro/macroscale, the stiffness of cement matrix and modulus of fiber-matrix interface dominate the strain-hardening behavior before fiber debonding, whereas the stiffness and friction coefficient of interface control the strain-softening process during fiber pulling-out. These insights highlight the hierarchical pathway to toughness modulation in UHPFRC.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108099"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145673801","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

Unravelling chemical-microstructural pathways of deformation in MgO-fly ash cementitious systems mgo -粉煤灰胶凝体系中变形的化学-微观结构路径揭示

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.cemconres.2025.108128

Shuai Ding , Cise Unluer , Kai Li , Yanlong Ren , Ning Li , Zhangli Hu , Jiaping Liu

{"title":"Unravelling chemical-microstructural pathways of deformation in MgO-fly ash cementitious systems","authors":"Shuai Ding , Cise Unluer , Kai Li , Yanlong Ren , Ning Li , Zhangli Hu , Jiaping Liu","doi":"10.1016/j.cemconres.2025.108128","DOIUrl":"10.1016/j.cemconres.2025.108128","url":null,"abstract":"<div><div>MgO expansive agents (MEA) and fly ash (FA) are widely combined to mitigate shrinkage in concrete, yet their interaction mechanisms remain unclear. This study clarifies how FA regulates MEA-induced expansion through microstructural evolution and pore solution chemistry, with swelling and crystallization pressures identified as the driving forces. At early stages, FA lowered pH, elevated Mg<sup>2+</sup> concentration, accelerating periclase hydration. Higher mesoporosity enlarged dissolution interface, promoted formation of finer brucite with stronger water adsorption capacity, increasing swelling pressure. At later stages, pozzolanic reaction of FA reduced portlandite formation, diminishing spatial confinement near MEA and alleviating crystallization pressure. Suppressed portlandite barriers and enhanced Mg<sup>2+</sup> mobility promoted brucite precipitation into surrounding voids, refining pore structure and improving dimensional stability. This work extends understanding of MEA-induced deformation to a coupled chemical–microstructural level and shows that FA regulates expansion driving forces through ionic and microstructural interactions, establishing a framework for achieving full-stage shrinkage compensation.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108128"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880215","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

Square-root law prediction of chloride penetration rates in stabilized cement pastes 稳定水泥浆中氯离子渗透速率的平方根定律预测

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.cemconres.2025.108101

Thomas Bernard , William Wilson

引用次数: 0

Examining the pH dependence of Fe behavior in hydrotalcite-group structures 水滑石基团结构中铁行为的pH依赖性研究

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.cemconres.2025.108097

Jiaxing Ban , Barbara Lothenbach , John L. Provis , George Dan Miron , Zeyu Zhou , Dengquan Wang , Sergey V. Churakov , Bin Ma

{"title":"Examining the pH dependence of Fe behavior in hydrotalcite-group structures","authors":"Jiaxing Ban , Barbara Lothenbach , John L. Provis , George Dan Miron , Zeyu Zhou , Dengquan Wang , Sergey V. Churakov , Bin Ma","doi":"10.1016/j.cemconres.2025.108097","DOIUrl":"10.1016/j.cemconres.2025.108097","url":null,"abstract":"<div><div>Hydrotalcite-group layered double hydroxide (LDH) phases are important in many technical and geological contexts, and in applications ranging from environmental processes to catalysts to cements. This study systematically investigates the roles of Fe in LDH structures across varying pH conditions relevant to concrete environments, combining laboratory-based characterization, synchrotron-based techniques, and thermodynamic modeling. Elevated pH enhances Fe incorporation into the LDH phase, while suppressing ferrihydrite formation. At pH > 11, partial LDH dissolution is observed. Thermodynamic modeling and diffractometry reveal the transformation mechanism: control of the initial pH increases promotes Al(III) and Fe(III) uptake into LDH structures, while further alkalinization (pH > 11) triggers selective Al(III) dissolution, thereby increasing the M<sup>2+</sup>/M<sup>3+</sup> ratio and altering unit cell parameters. These findings elucidate the dynamics between Fe(III) incorporation in LDH and ferrihydrite precipitation, governed by pH-dependent solubility and charge-balance constraints.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108097"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689792","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 insights into dynamic evolution of colloidal network structure during early-age hardening of cementitious materials 胶凝材料早期硬化过程中胶体网络结构动态演化的新认识

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-18 DOI: 10.1016/j.cemconres.2025.108120

Hengrui Liu , Kaiyin Zhao , Shipeng Zhang , Hanghua Zhang , Shuangshuang Liu , Lucen Hao , Hongyan Ma , Kamal Khayat , Chi Sun Poon

{"title":"New insights into dynamic evolution of colloidal network structure during early-age hardening of cementitious materials","authors":"Hengrui Liu , Kaiyin Zhao , Shipeng Zhang , Hanghua Zhang , Shuangshuang Liu , Lucen Hao , Hongyan Ma , Kamal Khayat , Chi Sun Poon","doi":"10.1016/j.cemconres.2025.108120","DOIUrl":"10.1016/j.cemconres.2025.108120","url":null,"abstract":"<div><div>The evolution of microstructure in cementitious materials during their transition from fluid to solid state plays a critical role in determining their ultimate mechanical strength and overall performance. This hydration stage primarily involves a dynamic densification process occurring within the colloidal network. However, the field of cement-based materials currently lacks a comprehensive theoretical framework and associated parameters capable of effectively characterizing the specific structural regions within this network. In this study, we propose an Improved Particle Linkage (IPL) theory for describing the strength, types, and quantities of particle linkages within colloidal network. The IPL theory classifies the internal network structure into three distinct regions, namely the α<sub>weak</sub>, β<sub>strong</sub> and γ<sub>inherent</sub>. The γ<sub>inherent</sub> and β<sub>strong</sub> region predominantly influence the strength of the colloidal network at the initial and later hydration stages, respectively, whereas the α<sub>weak</sub> region contributes steadily to the network strength across all hydration stages. Furthermore, the progressive intensification of the β<sub>strong</sub> region during hydration is identified as the principal driving factor for microstructural evolution, leading to a critical transition point in fresh properties. Additionally, a novel parameter, termed the network hydration index (ξ), to quantitatively characterize the overall degree of hydration within the colloidal network is establishment.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108120"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785132","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

In situ reaction-strengthening of ice-templated porous geopolymers for high anisotropy and robustness 高各向异性和坚固性的冰模板多孔地聚合物的原位反应强化

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.cemconres.2025.108104

Fangxian Li , Chaofeng Zhang , Qiang Yu , Li Zheng , Jiangxiong Wei , Qijun Yu

引用次数: 0

Deciphering the initial hydration reaction of tricalcium aluminate based on Ab initio-accurate machine learning force field 基于从头算精确机器学习力场的铝酸三钙初始水化反应解译

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-22 DOI: 10.1016/j.cemconres.2025.108124

Weihuan Li , Chenchen Xiong , Yang Zhou , Yangzezhi Zheng , Jiarui Xing , Yanji Jin , Yulin Wang

{"title":"Deciphering the initial hydration reaction of tricalcium aluminate based on Ab initio-accurate machine learning force field","authors":"Weihuan Li , Chenchen Xiong , Yang Zhou , Yangzezhi Zheng , Jiarui Xing , Yanji Jin , Yulin Wang","doi":"10.1016/j.cemconres.2025.108124","DOIUrl":"10.1016/j.cemconres.2025.108124","url":null,"abstract":"<div><div>Mineral dissolution is a critical phenomenon in various fields, particularly in the early hydration of Portland cement. Despite its importance, atomic-scale mechanisms remain elusive due to limitations in experimental and computational methods. Using an efficient sampling strategy that integrates metadynamics and targeted molecular dynamics, we developed a deep learning interatomic potential with quantum-level accuracy and scalable computational efficiency to reveal the dissolution mechanisms of tricalcium aluminate (C<sub>3</sub>A). The results uncover distinct dissociation pathways of calcium and aluminate ions. Specifically, Ca ions follow a ligand-exchange mechanism, preferentially transitioning to an unsaturated coordination state before bonding with water molecules. Conversely, Al ions first coordinate with water molecules to reach a supersaturated coordination state, which promotes the opening of six-membered rings and the cleavage of Al ions. This work elucidates the thermodynamics of C<sub>3</sub>A dissolution, deepening the understanding of mineral-water interfacial reactions, and provides an efficient, accurate approach for probing complex reaction pathways.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108124"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813726","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

Sodium aluminate activated BOF steel slag: Impact of Al(OH)4− on reaction mechanism 铝酸钠活化转炉钢渣：Al(OH)4−对反应机理的影响

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-19 DOI: 10.1016/j.cemconres.2025.108116

Mengyu Zhu , Yuxuan Chen , S.R. van der Laan , Tao Liu , Qingliang Yu

{"title":"Sodium aluminate activated BOF steel slag: Impact of Al(OH)4− on reaction mechanism","authors":"Mengyu Zhu , Yuxuan Chen , S.R. van der Laan , Tao Liu , Qingliang Yu","doi":"10.1016/j.cemconres.2025.108116","DOIUrl":"10.1016/j.cemconres.2025.108116","url":null,"abstract":"<div><div>The limited hydraulic reactivity of Basic Oxygen Furnace (BOF) slag, caused by its low-aluminum and high-iron composition, restricts its high-value applications. This study employs sodium aluminate (NaAlO<sub>2</sub>, NA) as an activator, with a focus on the mechanistic role of Al(OH)<sub>4</sub><sup>−</sup> in modulating the hydration pathways of belite in BOF slag. Systematic investigations of phase evolution, microstructural development, pore solution chemistry, and mechanical properties reveal that NA significantly enhances the early reactivity of belite and brownmillerite and promotes the formation of Si(Fe)-rich hydrogarnet and C(N)-A-S-H gels, enabling synergistic hydration between belite and brownmillerite at early ages. The NA-activated pastes develop a denser microstructure, exhibiting quadrupled early strength compared to the non-activated system. Crucially, the system demonstrates superior environmental performance, with heavy metal leaching concentrations consistently below regulatory thresholds. These findings elucidate the activation mechanisms of NA and propose a viable strategy for advanced BOF slag utilization.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108116"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785100","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

The role of carbonate anions and early-formed phases on the efficiency of PCE in alkali-activated slag 碱渣中碳酸盐阴离子和早期形成相对PCE效率的影响

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-20 DOI: 10.1016/j.cemconres.2025.108122

Yuliang Wang, Shengnan Sha, Hailong Ye

{"title":"The role of carbonate anions and early-formed phases on the efficiency of PCE in alkali-activated slag","authors":"Yuliang Wang, Shengnan Sha, Hailong Ye","doi":"10.1016/j.cemconres.2025.108122","DOIUrl":"10.1016/j.cemconres.2025.108122","url":null,"abstract":"<div><div>The mechanism responsible for the reduced dispersing efficiency of polycarboxylate ether (PCE) superplasticizers in carbonate-activated slag system (AAS) remains controversial and ambiguous, particularly regarding the roles of carbonate anions and early-formed phases. This study systematically evaluated the fluidity and adsorption behavior of PCE in K₂CO₃-activated slag with varying alkali modulus and in CaO-K₂CO₃-activated slag. Results show that in K₂CO₃-activated slag systems, the inefficiency of PCE at low dosages (≤ 1 mg/g binder) is primarily due to its preferential adsorption onto early-formed calcium carbonate phases. At higher dosages (> 1 mg/g), both competitive adsorption by CO₃<sup>2−</sup> ions and conformational collapse of PCE macromolecules dominate its reduced dispersing performance. In CaO–K₂CO₃-activated systems, early-formed calcium carbonate phases still consume part of the PCE at low dosages (≤ 4 mg/g). However, CaO reduces CO₃<sup>2−</sup> ion concentration, weakening competitive adsorption and improving PCE dispersing efficiency compared to K₂CO₃-activated systems.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108122"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785099","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