Cement and Concrete Research最新文献_第5页

Comparative study of the early stages of crystallization of calcium silicate hydrate (C-S-H) and calcium aluminate silicate hydrate (C-A-S-H) 水合硅酸钙（C-S-H）与水合铝酸钙（C-A-S-H）早期结晶阶段的比较研究

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-13 DOI: 10.1016/j.cemconres.2025.107873

Yannick H. Emminger, Luca Ladner, Cristina Ruiz-Agudo

{"title":"Comparative study of the early stages of crystallization of calcium silicate hydrate (C-S-H) and calcium aluminate silicate hydrate (C-A-S-H)","authors":"Yannick H. Emminger, Luca Ladner, Cristina Ruiz-Agudo","doi":"10.1016/j.cemconres.2025.107873","DOIUrl":"10.1016/j.cemconres.2025.107873","url":null,"abstract":"<div><div>The use of SCMs as partial substitutes for PC has made C-A-S-H a key binding phase in modern cement, yet its crystallization mechanism remains elusive. This study investigates the early stages of synthetic C-A-S-H formation and compares them with C-S-H using double addition of stoichiometric calcium and silicon amounts at a Ca/Al ratio of 5. Through real-time monitoring of solution parameters—transmittance, free Ca<sup>2+</sup> conductivity, and pH—complemented by structural and morphological characterization (FTIR, XRD, SEM, TEM, and NMR), we demonstrate that C-A-S-H formation is at least a two-step process involving amorphous globules, which then evolve into foil-like particles with higher crystallinity. Additionally, we reveal that Al promotes Ca binding during the prenucleation stage and slightly accelerates nucleation. These results highlight important differences in the formation pathways of both hydrates, particularly the extended stability of the C-A-S-H globules, which might affect the workability and setting time in aluminium-containing blended cements.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107873"},"PeriodicalIF":10.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608516","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

Corrosion behavior of steel reinforcement in magnesium silicate hydrate (M-S-H) concrete 水化硅酸镁（M-S-H）混凝土中钢筋的腐蚀行为

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-12 DOI: 10.1016/j.cemconres.2025.107858

Dan Meng, En-Hua Yang, Shunzhi Qian

引用次数: 0

Dissolution kinetics of iron sulfide minerals in alkaline solutions 硫化铁矿物在碱性溶液中的溶解动力学

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-11 DOI: 10.1016/j.cemconres.2025.107850

Zhanzhao Li , Christopher A. Gorski , Aaron Thompson , Jeffrey R. Shallenberger , Gopakumar Kaladharan , Aleksandra Radlińska

{"title":"Dissolution kinetics of iron sulfide minerals in alkaline solutions","authors":"Zhanzhao Li , Christopher A. Gorski , Aaron Thompson , Jeffrey R. Shallenberger , Gopakumar Kaladharan , Aleksandra Radlińska","doi":"10.1016/j.cemconres.2025.107850","DOIUrl":"10.1016/j.cemconres.2025.107850","url":null,"abstract":"<div><div>Deleterious aggregate reactions induced by iron sulfide minerals, especially pyrrhotite and pyrite, have devastated concrete structures across many global regions. While these minerals have been extensively studied under acidic conditions, their behavior in alkaline environments, such as concrete, remains poorly understood. This study investigates the kinetics and mechanisms of iron sulfide dissolution at high pH (13–14). Results revealed that pyrrhotite dissolves orders of magnitude more rapidly than pyrite, with dissolution rates increasing with both pH and temperature. The type of alkali (potassium or sodium) in the solution was not found to affect the dissolution behavior. Kinetic modeling and experimental characterization indicated that the dissolution kinetics of pyrrhotite is controlled by a combination of chemical reactions (oxidation of iron and sulfur species) and diffusion (through an Fe(III)-(oxy)hydroxide layer). These findings provide practical insights into controlling dissolution and mitigating iron sulfide-induced damage in concrete.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107850"},"PeriodicalIF":10.9,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143590120","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

Rate effect on the pull-out load of individual fibers in concrete: A probabilistic modeling approach 混凝土中单个纤维拉拔荷载的速率效应：一种概率建模方法

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-11 DOI: 10.1016/j.cemconres.2025.107857

Takeru Kanazawa , John E. Bolander

{"title":"Rate effect on the pull-out load of individual fibers in concrete: A probabilistic modeling approach","authors":"Takeru Kanazawa , John E. Bolander","doi":"10.1016/j.cemconres.2025.107857","DOIUrl":"10.1016/j.cemconres.2025.107857","url":null,"abstract":"<div><div>Understanding of the load-rate dependence of fiber pull-out from concrete has been hindered by the large scatter of test data. Relatively little attention has been given to the statistical nature of single-fiber pull-out under different loading rates. The present study is based on a probabilistic interpretation of the pull-out phenomenon, assessing the statistical fluctuations observed in the common finding that complete pull-out occurs at greater load levels under higher loading rates. Since progressive debonding along the fiber–matrix interface affects the pull-out behavior, interfacial crack growth is modeled using a fracture mechanics approach. Based on a theoretical justification, the transition probability to debonding is devised and implemented within a Markov chain model. The Markov model accounts for debonding propagation with each stress increment until complete pull-out. The results demonstrate that the probability distributions of stress at complete pull-out differ from a normal distribution. The coefficient of variation is also independent of the loading rates. These findings show reasonable agreement with statistical variations observed from test data.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107857"},"PeriodicalIF":10.9,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143590118","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

High energy X-ray scattering reveals the short-range order of proto-C-S-H: Implications for the nucleation of cement hydrates 高能x射线散射揭示了原c - s - h的短程顺序：对水泥水合物成核的启示

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-10 DOI: 10.1016/j.cemconres.2025.107855

R. Besselink , A. Poulain , M. la Bella , A.-L. Auzende , S. Goberna-Ferron , M.P. Asta , V. Magnin , S. Bureau , L. Fernández-Carrasco , A.E.S. Van Driessche , A. Fernandez-Martinez

{"title":"High energy X-ray scattering reveals the short-range order of proto-C-S-H: Implications for the nucleation of cement hydrates","authors":"R. Besselink , A. Poulain , M. la Bella , A.-L. Auzende , S. Goberna-Ferron , M.P. Asta , V. Magnin , S. Bureau , L. Fernández-Carrasco , A.E.S. Van Driessche , A. Fernandez-Martinez","doi":"10.1016/j.cemconres.2025.107855","DOIUrl":"10.1016/j.cemconres.2025.107855","url":null,"abstract":"<div><div>The heterogeneous nature of the cement clinker, its complex coupled dissolution/re-precipitation process and the complex defect chemistry of the hydrates formed during cement hydration, make that the nucleation and growth mechanisms of cement hydrates are not fully understood. Recent studies have suggested the existence of a disordered precursor prior to the crystallization of C-S-H. Here, a combination of X-ray scattering and electron microscopy experiments are used to study the structure and crystallization kinetics of this amorphous intermediate. Our results suggest that proto-C-S-H is predominantly composed of 6-fold oxygen-to-calcium coordinated CaO<sub>x</sub> polyhedra, in contrast to the 7-fold coordinated polyhedra in C-S-H with a tobermorite-like structure. The addition of gluconate, a widely used additive, resulted in an increased kinetic persistence of proto-C-S-H. Overall, our study provides new insights into the formation and structure of proto-C-S-H, and suggests that it plays an important role in the crystallization mechanism of C-S-H.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107855"},"PeriodicalIF":10.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143590050","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

Pb-induced retardation of early hydration of Portland cement: Insights from in-situ XRD and implications for substitution with industrial by-products 铅诱导的硅酸盐水泥早期水化迟缓：来自原位XRD的见解和工业副产物替代的意义

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-09 DOI: 10.1016/j.cemconres.2025.107867

Yikai Liu , Maria Chiara Dalconi , Maurizio Pietro Bellotto , Luca Valentini , Simone Molinari , Xinyi Yuan , Daolin Wang , Wei Hu , Qiusong Chen , Alejandro Fernandez-Martinez , Gilberto Artioli

{"title":"Pb-induced retardation of early hydration of Portland cement: Insights from in-situ XRD and implications for substitution with industrial by-products","authors":"Yikai Liu , Maria Chiara Dalconi , Maurizio Pietro Bellotto , Luca Valentini , Simone Molinari , Xinyi Yuan , Daolin Wang , Wei Hu , Qiusong Chen , Alejandro Fernandez-Martinez , Gilberto Artioli","doi":"10.1016/j.cemconres.2025.107867","DOIUrl":"10.1016/j.cemconres.2025.107867","url":null,"abstract":"<div><div>Using industrial by-products as substitutes for Ordinary Portland Cement (OPC) is a promising strategy to reduce its environmental impact. However, heavy metals like Pb strongly interfere with initial kinetics. The dynamic physicochemical environment makes it challenging to identify the key factors. Here, we employed <em>in-situ</em> XRD as a time-dependent method, alongside conventional characterization techniques and geochemical modeling, to investigate the Pb-induced retardation in CEMI 42.5R and 52.5R. The results show that Pb-hydroxides and Pb-O-Si clusters are expected to be the primary mechanisms for this inhibition. Among clinker phases, C<sub>3</sub>A dissolution is less affected and serves as the primary source of alkalinity in early hydration, promoting hydration products precipitation and gypsum dissolution. Geochemical modeling suggests that Pb species concentration in the solution regulates the precipitation of hydration products, especially portlandite. The comparison of hydration kinetics of 2 types of OPC highlights optimizing particle size as a solution to mitigate retardation impact.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107867"},"PeriodicalIF":10.9,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576380","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

A preliminary study on an effective and simplistic self-healing concept for cement using coarse clinker particles as the healing agent 以粗熟料颗粒为愈合剂的水泥有效且简单自愈概念的初步研究

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-05 DOI: 10.1016/j.cemconres.2025.107859

Jialiang Wang, Min Wu

{"title":"A preliminary study on an effective and simplistic self-healing concept for cement using coarse clinker particles as the healing agent","authors":"Jialiang Wang, Min Wu","doi":"10.1016/j.cemconres.2025.107859","DOIUrl":"10.1016/j.cemconres.2025.107859","url":null,"abstract":"<div><div>Effective, low-cost and simplistic self-healing strategies for cement-based systems are attractive. This work proposed a concept where coarse clinker particles were used to replace cement and acted as the healing agent, and the effectiveness was validated by comprehensive studies. The results showed the high potential of the clinker sizes (40–60 μm, 60–90 μm, 0.5–1 mm) and replacement ratios (20–40%) under the studied conditions. For the clinker sized 40–60 μm, the 28d tensile and compressive strength recovery rates achieved 1.12 and 0.91, and the 56d crack sealing width and area reached 300–400 μm and 83.4%–94.4%, which even exceeds conventional autonomous self-healing strategies. The microscopic analyses indicated that larger clinker particles affected reaction kinetics of hydrating particles and improved spatial distribution of the hydration products. By retaining abundant unhdyrated parts and leading to more uniform distribution of the hydration products, the coarse clinker particles significantly improved self-healing properties of the cement mixes.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107859"},"PeriodicalIF":10.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546521","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

From bauxite residue mineralogy to reactivity and properties of blended cements 从铝矾土残渣矿物学到混合水泥的反应性和特性

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-03 DOI: 10.1016/j.cemconres.2025.107854

Michael Wenzel, Fabien Georget, Thomas Matschei

引用次数: 0

Mechanisms governing in-depth infiltration of crack filling solutions in concrete using a magnetic approach 利用磁性方法控制裂缝填充溶液在混凝土中的深度渗透机制

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-01 DOI: 10.1016/j.cemconres.2025.107856

Onur Ozturk, Sriramya Duddukuri Nair

引用次数: 0

Freezing behavior of ionic solutions within calcium silicate hydrate gel pores 水合硅酸钙凝胶孔隙中离子溶液的冻结行为

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-01 DOI: 10.1016/j.cemconres.2025.107841

Songyue Chai , Jianyu Song , Muhan Wang , Yue Zhang , Bo-Tao Huang , Bing Yin , Pan Wang , Dongshuai Hou

{"title":"Freezing behavior of ionic solutions within calcium silicate hydrate gel pores","authors":"Songyue Chai , Jianyu Song , Muhan Wang , Yue Zhang , Bo-Tao Huang , Bing Yin , Pan Wang , Dongshuai Hou","doi":"10.1016/j.cemconres.2025.107841","DOIUrl":"10.1016/j.cemconres.2025.107841","url":null,"abstract":"<div><div>Salt-frost damage is a crucial issue affecting the durability of concrete structures, however, the freezing behavior and micro-mechanisms of ionic solutions within cementitious material gel pores remain unclear, which is not conducive to optimizing cold-resistant concrete design from the bottom up. In this study, the models of saturated calcium silicate hydrate (C-S-H) gel pores containing NaCl, Na<sub>2</sub>SO<sub>4</sub>, and aqueous solution, respectively, were constructed by molecular dynamics (MD) simulation. We investigated the freezing behavior of ionic solutions within the gel pores at 230 K. The freezing process of models exhibited a distinct periodic pattern. Na<sup>+</sup> and Cl<sup>−</sup> delayed the freezing of pore water, while <span><math><msubsup><mi>SO</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></math></span> accumulated near the freezing front, significantly hindering freezing progression. The freezing resulted in two types of nano brine pockets in the NaCl model. This work provides new molecular insights into salt freezing in cementitious materials and informs the design of cold-resistant concrete at the molecular scale.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107841"},"PeriodicalIF":10.9,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518892","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