Cement and Concrete Research最新文献_第5页

Hydration mechanisms in Roman seawater concrete: Archaeological analogue for validation of long-term ageing reactive transport model 罗马海水混凝土的水化机制：验证长期老化反应输运模型的考古模拟

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.cemconres.2025.108114

Fructueux Jesugnon Sohounme , Mejdi Neji , Nicolas Seigneur , Katia Schörle , Arnaud Coutelas , T. Charpentier , Mélanie Moskura , Cyrielle Jardin , Alexandre Dauzères

{"title":"Hydration mechanisms in Roman seawater concrete: Archaeological analogue for validation of long-term ageing reactive transport model","authors":"Fructueux Jesugnon Sohounme , Mejdi Neji , Nicolas Seigneur , Katia Schörle , Arnaud Coutelas , T. Charpentier , Mélanie Moskura , Cyrielle Jardin , Alexandre Dauzères","doi":"10.1016/j.cemconres.2025.108114","DOIUrl":"10.1016/j.cemconres.2025.108114","url":null,"abstract":"<div><div>Cement-based materials are considered for sealing plugs in deep geological disposal of radioactive waste. Ensuring their long-term durability is critical for safety over millennia. The Roman Concrete (RoC) project uses ancient Roman underwater concretes as analogues to validate reactive transport models for long-term ageing. This study focuses on hydration mechanisms in Roman concrete made with Phlegrean pozzolan, slaked lime, and seawater. Various techniques (XRD, SEM-EDS, NMR, nanoindentation, microtomography, ICP-OES, ion chromatography) were used to characterize hydration products. Casting underwater led to aragonite and brucite layers with a 60 GPa Young's modulus, protecting the concrete from further degradation. In the core, pozzolanic reactions produce C-(A)-S-H phases (Ca/Si = 1.2; Al/Si = 0.2) with a modulus of 12 GPa. HYTEC modeling confirmed the mechanism: incongruent pozzolan dissolution releases ions (K<sup>+</sup>, SiO₄<sup>4−</sup>, Al<sup>3+</sup>, Na<sup>+</sup>), promoting C-(A)-S-H formation and portlandite consumption.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108114"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748695","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

Quantitative characterization of interfacial enhancement in microfiber-reinforced recycled cementitious composites after carbonation using nanoindentation combined with 4D CT 纳米压痕结合4D CT定量表征微纤维增强再生胶凝复合材料碳化后界面增强

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.cemconres.2025.108115

Changqing Wang , Yuelan Lu , Zhiming Ma

{"title":"Quantitative characterization of interfacial enhancement in microfiber-reinforced recycled cementitious composites after carbonation using nanoindentation combined with 4D CT","authors":"Changqing Wang , Yuelan Lu , Zhiming Ma","doi":"10.1016/j.cemconres.2025.108115","DOIUrl":"10.1016/j.cemconres.2025.108115","url":null,"abstract":"<div><div>This study systematically explores the interfacial transition zone (ITZ) strengthening mechanisms in microfiber-reinforced recycled cementitious composites (MF-RCC) under carbonation treatment, primarily through quantitative nanoindentation mapping combined with supportive 4D CT imaging. Nanoindentation was innovatively adopted to quantify ITZ enhancement, revealing significant increases of approximately 42 % in local hardness and 48 % in elastic modulus after carbonation. A statistical deconvolution model was established to interpret the nanoindentation data, clearly showing a shift toward higher hardness and reduced variability (homogeneity improved by approximately 35 %) in the carbonated specimens. Complementary 4D CT characterization validated these findings, indicating a noticeable reduction of porosity by approximately 40 %, thus supporting the mechanical densification of the ITZ. The integrated nanoindentation and statistical modeling results highlight carbonation combined with microfiber reinforcement as an effective approach to optimize interfacial properties and mechanical stability, providing quantitative insights for the sustainable design of recycled cementitious materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108115"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797701","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

Quantitative dependence of dynamic drying shrinkage of white cement pastes on pore-scale water removal kinetics 白水泥浆体动态干燥收缩对孔隙尺度脱水动力学的定量依赖

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.2025.108117

Huaming Liang , Hanlin Zou , Huan Wang , Zhendi Wang , Chunsheng Zhou

{"title":"Quantitative dependence of dynamic drying shrinkage of white cement pastes on pore-scale water removal kinetics","authors":"Huaming Liang , Hanlin Zou , Huan Wang , Zhendi Wang , Chunsheng Zhou","doi":"10.1016/j.cemconres.2025.108117","DOIUrl":"10.1016/j.cemconres.2025.108117","url":null,"abstract":"<div><div>To quantify the correlation between dynamic drying shrinkage and pore-scale water removal kinetics, the pore-scale water allocation and dynamic shrinkage of white cement pastes upon drying at 75%, 43%, and 11% RHs were monitored and analyzed. Experimental results show a bilinear dependence of dynamic shrinkage on the removals of interlayer and gel water within C<img>S<img>H gel irrespective of RHs. C<img>S<img>H gel behaves like flexible hydrous sponges skewered by a stiff skeleton. Although C<img>S<img>H sponges lose water and contract remarkably upon drying, the spatial constraint of skeleton limits the deformation of pastes. Consequently, only 0.72% to 4.23% of interlayer and gel water losses are translated into measurable shrinkage. The removal of gel water contributes to shrinkage more than that of interlayer water due to the larger size of gel pores, though both their contributions decrease with declining RH and become similar. Mitigating shrinkage necessitates reducing C<img>S<img>H contraction and enhancing skeleton stiffness.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108117"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145812862","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

Optimizing Mg/PO4 molar ratio for ultra-high-performance steel fiber-reinforced magnesium potassium phosphate cement-based composite 超高性能钢纤维增强磷酸镁钾水泥基复合材料Mg/PO4摩尔比优化

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-24 DOI: 10.1016/j.cemconres.2025.108126

Yizhou Zhao , Barbara Lothenbach , Zhangli Hu , Biwan Xu

{"title":"Optimizing Mg/PO4 molar ratio for ultra-high-performance steel fiber-reinforced magnesium potassium phosphate cement-based composite","authors":"Yizhou Zhao , Barbara Lothenbach , Zhangli Hu , Biwan Xu","doi":"10.1016/j.cemconres.2025.108126","DOIUrl":"10.1016/j.cemconres.2025.108126","url":null,"abstract":"<div><div>The magnesium-to-KH<sub>2</sub>PO<sub>4</sub> (Mg/PO₄) molar ratio is crucial for magnesium potassium phosphate (MKP) cement-based composites. To develop Ultra-High-Performance Cement-based Composite (UHPCC) using MKP cement, the effect of Mg/PO₄ molar ratios (4–8) on the properties and microstructure of steel fiber-reinforced MKP cement-based composites was investigated. Increasing the Mg/PO₄ ratio accelerated the hydration kinetics, without compromising flowability. The lowest molar ratio (Mg/PO₄ = 4) resulted in significant shrinkage, whereas ratios ≥6 induced slight expansion. The optimal molar ratio was determined to be Mg/PO<sub>4</sub> = 7, which yielded a composite meeting UHPCC requirements, with 28-day compressive, flexural, and tensile strengths of ∼132 MPa, ∼ 44 MPa, and ∼ 14 MPa, respectively. The optimum properties achieved at this ratio can be attributed to the highest fiber-matrix bonding stress and a denser microstructure with a more rational composition, leading to higher local elastic modulus, increased hardness, and improved crack resistance.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108126"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823220","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

Thermodynamic simulation-assisted design of the electrolytic manganese residue-slag-Ca(OH)2 cementitious system: Reaction and Mn immobilization 电解锰渣-炉渣- ca (OH)2胶凝体系的热力学模拟辅助设计：反应与Mn固定化

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.2025.108119

Lang Pang , Jianwei Sun , John L. Provis , Barbara Lothenbach , Bin Ma , Dengquan Wang

{"title":"Thermodynamic simulation-assisted design of the electrolytic manganese residue-slag-Ca(OH)2 cementitious system: Reaction and Mn immobilization","authors":"Lang Pang , Jianwei Sun , John L. Provis , Barbara Lothenbach , Bin Ma , Dengquan Wang","doi":"10.1016/j.cemconres.2025.108119","DOIUrl":"10.1016/j.cemconres.2025.108119","url":null,"abstract":"<div><div>The disposal of electrolytic manganese residue (EMR) is a critical challenge. This study introduces an EMR-blast furnace slag-Ca(OH)<sub>2</sub> cementitious system (EG<sup>CH</sup>), utilizing the gypsum in EMR to activate the slag to form a product resembling a supersulfated cement. With up to 40 % EMR incorporation, it achieves compressive strengths of 16.8 MPa at 3 d and 33.2 MPa at 28 days. The primary reaction products are AFt, C-A-S-H and hydrotalcite. A thermodynamic simulation-assisted iterative calculation was developed and validated by pore solution analysis, to accurately quantify phase evolution. EMR content significantly influences the reaction and results in distinct exothermic profiles. The optimal 40 % EMR content results in the densest microstructure due to the balanced formation of AFt and C-A-S-H. Mn is immobilized in EG<sup>CH</sup> with two barriers to its leaching and cannot leach out until the pH drops below 7. This binder offers a practical solution for the utilization of EMR.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108119"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145812864","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

Impedance and electrical conductivity of C-S-H C-S-H的阻抗和电导率

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.2025.108123

Tulio Honorio , Walter Batista Bonfim , Oswaldo Cascudo

{"title":"Impedance and electrical conductivity of C-S-H","authors":"Tulio Honorio , Walter Batista Bonfim , Oswaldo Cascudo","doi":"10.1016/j.cemconres.2025.108123","DOIUrl":"10.1016/j.cemconres.2025.108123","url":null,"abstract":"<div><div>The impedance and complex electrical conductivity of C-S-H have not been directly measured, even though electromagnetic measurements are a key non-destructive technique for probing cement systems. Here, we evaluate the frequency-dependent electrical conductivity of C-S-H using molecular dynamics simulations for the first time. The effect of nanopore size is assessed for pores spanning the interlayer to the gel range, showing that interlayer conductivity is governed by subdiffusive ion dynamics while Fickean dynamics drives gel pores behavior. Ionic self-correlations dominate the conductivity, while water–ion and solid–ion contributions are smaller but non-negligible. By combining molecular dynamics with mean-field homogenization, we obtain gel-scale estimates consistent with available data (i.e., with ratio between gel conductivity and pore solution conductivity on the order of 1/100). As with other transport properties, accounting for anisotropy and associated dimensionality loss is critical for understanding electrical conductivity bottom-up. Our results provide direct evaluation of the frequency-dependent conductivity of C-S-H, offering valuable input for multiscale modeling and for interpreting electromagnetic measurements of cementitious materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108123"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785097","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

Evolution of hydration in cement blends with incorporation of activated low-kaolinite clays: Insights into the preferred aluminum uptake by C-(A)-S-H 掺入活化低高岭石粘土的水泥混合物中水化的演变：C-(A)- s - h对铝的首选吸收的见解

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.cemconres.2025.108086

Amrita Hazarika , Liming Huang , Joao Figueira , Arezou Babaahmadi

{"title":"Evolution of hydration in cement blends with incorporation of activated low-kaolinite clays: Insights into the preferred aluminum uptake by C-(A)-S-H","authors":"Amrita Hazarika , Liming Huang , Joao Figueira , Arezou Babaahmadi","doi":"10.1016/j.cemconres.2025.108086","DOIUrl":"10.1016/j.cemconres.2025.108086","url":null,"abstract":"<div><div>Despite their global abundance, heterogenous clays are often excluded from SCM applications, due to their limited pozzolanicity. This study investigates hydration evolution, particularly aluminum uptake pathways, in statistically designed cement blends incorporating thermo-mechanochemically activated low-kaolinite clays.</div><div>Despite kaolinite contents below 40%, a 30% binary blend achieved 110% and 125% of OPC strength at 7 and 56 days, respectively, while reducing total porosity by 42% at 56 days. <sup>29</sup>Si NMR indicated an increase in silicate chain length in C-(A)-S-H, correlating with pore structure refinement and strength gain in 56 days of hydration. <sup>27</sup>Al NMR revealed a preferential incorporation of aluminum into C-(A)-S-H rather than AFm phases. This behavior is attributed to the lower alumina availability in the system compared to LC3 blends, suggesting that in such environments, C-(A)-S-H becomes the dominant host phase for aluminum. This incorporation pathway reduces the Al availability for carbonate-AFm formation, limiting the synergy typically observed in LC3 systems with added limestone.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108086"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731815","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

Development of CO2-induced SCMs for calcium sulfoaluminate cement: Towards enhancing hydration, compressive strength and later stage-ettringite stability 二氧化碳诱导的硫铝酸钙水泥SCMs的发展：朝着提高水化、抗压强度和后期钙矾石稳定性的方向发展

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-03-01 Epub Date: 2025-12-30 DOI: 10.1016/j.cemconres.2025.108121

Kai Cui , Danyang Zhao , Yingliang Zhao , Yong Zheng , Weiwei Wu , Qinglong Qin , Fenghua Nie , Jun Chang , Peiliang Shen , Chi Sun Poon

{"title":"Development of CO2-induced SCMs for calcium sulfoaluminate cement: Towards enhancing hydration, compressive strength and later stage-ettringite stability","authors":"Kai Cui , Danyang Zhao , Yingliang Zhao , Yong Zheng , Weiwei Wu , Qinglong Qin , Fenghua Nie , Jun Chang , Peiliang Shen , Chi Sun Poon","doi":"10.1016/j.cemconres.2025.108121","DOIUrl":"10.1016/j.cemconres.2025.108121","url":null,"abstract":"<div><div>Calcium sulfoaluminate cement (CSA) often exhibits limited long-term strength due to the lack of suitable supplementary cementitious materials (SCMs) that can effectively promote secondary hydration. This study introduces a novel approach for preparing CO<sub>2</sub> induced SCMs (CSCMs) derived from CSA, aiming to overcome this limitation and enhance both hydration kinetics and mechanical performance. CSCMs, produced by CO<sub>2</sub> induced CSA for three hours, consist of polycrystalline calcium carbonate phases, specifically, aragonite (7.6 %), vaterite (2.1 %) and calcite (22.4 %), alongside amorphous Al<img>Si gel. When incorporated into CSA at a dosage of 10 wt%, these CSCMs significantly accelerated hydration, resulting in increased formation of AFt and AH<sub>3</sub>, which boosted early compressive strength by 22.7 % in one day and 14.4 % at three days compared to control samples. Beyond early strength gains, the presence of CSCMs facilitated further reactions among calcium carbonate, Al<img>Si gel, and C<sub>4</sub>A<sub>3</sub>Š, leading to the generation of Mc and Hc phases. These products stabilized AFt and contributed to improving compressive strength over extended curing periods. After 180 days, samples containing CSCMs exhibited strength increases of 26.1 % (5 % CSCMs), 31.8 % (10 % CSCMs), and 27.2 % (20 % CSCMs), while the control sample experienced a 5.9 % strength reduction and 8.2 % AFt decomposition. The enhanced performance is attributed to the high reactivity and nucleation effects of the calcium carbonate and Al<img>Si gel components. This study developed low-cost CSCMs for dedicated CSA, while resolving the conflict between CSA strength development and carbon emission reduction.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"201 ","pages":"Article 108121"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880214","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

Moisture content as controlling mechanism behind corrosion rate of steel in carbonated low-clinker binders 水分含量是控制碳化低熟料粘结剂中钢腐蚀速率的机制

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-02-01 Epub Date: 2025-10-27 DOI: 10.1016/j.cemconres.2025.108065

Lupesh Dudi, Shashank Bishnoi

{"title":"Moisture content as controlling mechanism behind corrosion rate of steel in carbonated low-clinker binders","authors":"Lupesh Dudi, Shashank Bishnoi","doi":"10.1016/j.cemconres.2025.108065","DOIUrl":"10.1016/j.cemconres.2025.108065","url":null,"abstract":"<div><div>Experiments were performed to study the corrosion kinetics of steel in carbonated Portland cement (PC) and four low-clinker binder (clinker replaced with fly-ash, slag, and calcined clay) mortars equilibrated at various relative humidity conditions. The results show that moisture content is the primary factor controlling the corrosion kinetics across all binder compositions, while pore structure connectivity and pore solution composition in carbonated binders are additional factors contributing to the higher corrosion rate observed in the low-clinker binders. In comparison to the PC, low-clinker binders have a higher <span><math><mfenced><mrow><mi>C</mi><msup><mi>l</mi><mo>−</mo></msup></mrow></mfenced><mo>/</mo><mfenced><mrow><mi>O</mi><msup><mi>H</mi><mo>−</mo></msup></mrow></mfenced></math></span> and <span><math><mfenced><mrow><mi>S</mi><msubsup><mi>O</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></mfenced><mo>/</mo><mfenced><mrow><mi>O</mi><msup><mi>H</mi><mo>−</mo></msup></mrow></mfenced></math></span> ratios (due to lower hydroxide ion concentration and release of chlorides and sulfates on carbonation), along with greater porosity and pore connectivity due to coarsening of pore structure after carbonation. Furthermore, the mechanism of corrosion rate-resistivity linear relationship in different carbonated binder compositions is explained based on corrosion rate per unit moisture content, pore solution compositions, and microstructure parameters.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"200 ","pages":"Article 108065"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145383466","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

Development of metakaolin-enhanced alkali-activated portland cement for high-temperature applications 高温偏高岭土增强碱活化硅酸盐水泥的研制

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2026-02-01 Epub Date: 2025-11-17 DOI: 10.1016/j.cemconres.2025.108088

Pavlo Kryvenko , Igor Rudenko , Oleksandr Konstantynovskyi , Vladyslav Onatii

{"title":"Development of metakaolin-enhanced alkali-activated portland cement for high-temperature applications","authors":"Pavlo Kryvenko , Igor Rudenko , Oleksandr Konstantynovskyi , Vladyslav Onatii","doi":"10.1016/j.cemconres.2025.108088","DOIUrl":"10.1016/j.cemconres.2025.108088","url":null,"abstract":"<div><div>Introducing metakaolin and sodium water glass (silicate modulus – 2.8, density <em>–</em> 1100...1250 kg/m<sup>3</sup>) to ordinary portland cement (OPC) caused fundamental changes to the hydration products, forming ones from Na₂O-CaO-SiO₂-Al₂O₃-H₂O system and enhancing heat resistance. The setting times of metakaolin-containing alkali-activated portland cement were rather short. The increased heat resistance of this cement compared to OPC was shown, which is due to no rehydration of CaO, formed during the dehydration of Ca(OH)<sub>2</sub>, and recrystallization of zeolite-like phase of hydronepheline Na<sub>2</sub>O·Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>·2H<sub>2</sub>O into nepheline Na<sub>2</sub>O·Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> without structural destruction. The recrystallization of C-A-S-H phases during sintering into gehlenite 2CaO·Al<sub>2</sub>O<sub>3</sub>·SiO<sub>2</sub> contributed to a higher structure fragmentation while its self-reinforcement. These processes resulted in an increase in residual strength to 58.6…122.1 %. The mortar based on the designed cement was characterized by compressive strength ≥30 MPa, residual strength ≥70 %, and thermal shrinkage ≤5 % at temperatures up to 1000 °C.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"200 ","pages":"Article 108088"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145536224","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