Cement and Concrete Research最新文献_第10页

Microstructure tailoring of internal curing agents: modified cement particles/superabsorbent polymers composites balancing strength and shrinkage mitigation 内部固化剂的微观结构定制：改性水泥颗粒/高吸水性聚合物复合材料平衡强度和收缩减缓

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-31 DOI: 10.1016/j.cemconres.2025.107950

Yasen Li , Cheng Zhang , Yangyang Xiang , Yanru Chen , Tingzhong Li , Honghai Cui , Guoxing Sun

{"title":"Microstructure tailoring of internal curing agents: modified cement particles/superabsorbent polymers composites balancing strength and shrinkage mitigation","authors":"Yasen Li , Cheng Zhang , Yangyang Xiang , Yanru Chen , Tingzhong Li , Honghai Cui , Guoxing Sun","doi":"10.1016/j.cemconres.2025.107950","DOIUrl":"10.1016/j.cemconres.2025.107950","url":null,"abstract":"<div><div>Superabsorbent polymers (SAPs) are widely studied as internal curing agents in high-performance concrete, but their adverse effects on pore structure remain a challenge. This study introduces an innovative cement-integrated SAP (CiSAP) by modifying the interface, using KH570-modified cement (KMC) as the functional core. By optimizing KMC content, the microstructure was improved, leading to enhanced performance. Structural characterization confirmed that KMC was successfully embedded into the polymer network. CiSAP30 reduced shrinkage by 61.4 % due to its excellent desorption efficiency. The 28-day strength retention of CiSAP in cement-based materials varied from 93.4 % to 99.6 %, compared to the reference group without CiSAP. MIP and fractal dimension analysis indicated that CiSAP refined the microstructure by reducing large capillary pores and filling macropores. The sustained water release from CiSAP, along with KMC hydration, promoted long-term densification and controlled autogenous shrinkage. This study provides a novel strategy for designing internal curing agents for high-performance cement-based materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107950"},"PeriodicalIF":10.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185059","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 novel approach to reduce the shrinkage of cement-based materials: pH-responsive admixture from hydrophilic to hydrophobic transformation 一种减少水泥基材料收缩的新方法：ph响应外加剂从亲水性到疏水性的转变

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-29 DOI: 10.1016/j.cemconres.2025.107947

Simai Wang , Xiao Liu , Xiaokai Niu , Xinru Sun , Qian Xu , Zhitian Xie , Lei Lu , Yurui Xu , Minghui Jiang , Xinxin Li , Ziming Wang , Suping Cui

{"title":"A novel approach to reduce the shrinkage of cement-based materials: pH-responsive admixture from hydrophilic to hydrophobic transformation","authors":"Simai Wang , Xiao Liu , Xiaokai Niu , Xinru Sun , Qian Xu , Zhitian Xie , Lei Lu , Yurui Xu , Minghui Jiang , Xinxin Li , Ziming Wang , Suping Cui","doi":"10.1016/j.cemconres.2025.107947","DOIUrl":"10.1016/j.cemconres.2025.107947","url":null,"abstract":"<div><div>One of the effective ways to reduce the risk of concrete cracking is the reduction of drying shrinkage by adding shrinkage-reducing admixture (SRA), which is generally based on the mechanism of reducing surface tension. According to Young-Laplace equation, the mechanism of increasing contact angle should also be very effective. However, the increase of hydrophobicity of admixture would inevitably lead to the decrease of compatibility and effectiveness, which still has been unsolved. This study aims to provide a novel approach for decreasing capillary pressure to reduce the shrinkage of cement-based materials by designing a new admixture with pH-responsive characteristics, which can spontaneously achieve the hydrophilic to hydrophobic transformation through the alkaline environment of cement pore solution. Excellent pH-response and shrinkage reduction in cement mortars were shown. Most importantly, this novel approach was proved to be effective, which had great potential in inhibiting the shrinkage and cracking of cement-based materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107947"},"PeriodicalIF":10.9,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168111","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

Synergetic regulation of hydration and carbonation of reactive MgO cement by amino acids 氨基酸对活性MgO水泥水化和碳酸化的协同调节

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-28 DOI: 10.1016/j.cemconres.2025.107949

Shuang Liang , Xiangming Zhou , Pengkun Hou

{"title":"Synergetic regulation of hydration and carbonation of reactive MgO cement by amino acids","authors":"Shuang Liang , Xiangming Zhou , Pengkun Hou","doi":"10.1016/j.cemconres.2025.107949","DOIUrl":"10.1016/j.cemconres.2025.107949","url":null,"abstract":"<div><div>This study investigates the role of L-aspartic (L-Asp) in regulating the crystallisation of hydrated magnesium carbonates (HMCs) in carbonation-cured reactive MgO (RM). The effects of L-Asp on hydration kinetics, bulk density, compressive strength, phase composition, carbon sequestration, microstructure and morphology of RM composites were examined to understand its influence on the coupled hydration and carbonation processes. It has been found that L-Asp delays the precipitation of Mg<sup>2+</sup> and OH<sup>−</sup>, promoting the formation and stabilisation of the metastable nesquehonite (MgCO₃·3H₂O) polymorph. Carbonated composites incorporating L-Asp demonstrate a higher carbonation degree and enhanced stability compared to those without L-Asp. Notably, samples containing 0.2 M L-Asp sequestrated 46.7 % more CO<sub>2</sub> than those without amino acids. Additionally, amino acids lead to denser carbonation products with modified morphology, significantly enhancing carbonation efficiency and compressive strength. This study unveils the synergetic mechanism by which L-Asp influences hydration and carbonation in MgO-based binders, contributing to their enhanced performance.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107949"},"PeriodicalIF":10.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153949","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 effect of pore structure on the pessimum effect of salt scaling: A perspective from cryogenic liquid transport and ice pressure 孔隙结构对盐结垢消极效应的影响——来自低温液体输运和冰压的视角

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-26 DOI: 10.1016/j.cemconres.2025.107945

Qian Deng , Weitan Zhuang , Xuzhe Zhang , Shaohua Li , Qingliang Yu

{"title":"The effect of pore structure on the pessimum effect of salt scaling: A perspective from cryogenic liquid transport and ice pressure","authors":"Qian Deng , Weitan Zhuang , Xuzhe Zhang , Shaohua Li , Qingliang Yu","doi":"10.1016/j.cemconres.2025.107945","DOIUrl":"10.1016/j.cemconres.2025.107945","url":null,"abstract":"<div><div>Salt scaling damage peaks at a specific salt concentration, known as the pessimum concentration. However, reported pessimum concentrations vary widely, lacking a theoretical explanation. The microstructure of concrete is an important characteristic influencing the freezing behavior of pore solution, which is often neglected in salt scaling studies. This study investigates the effect of concrete microstructure on the pessimum concentration by review, experiment, and modeling. The results show that the pessimum concentration increases from 3 % to 7 % as the water-binder ratio decreases from 0.4 to 0.2. An ice content and cryosuction model considering the role of salt and pore structure is developed to establish the relationship between cryogenic liquid transport and damage. The analysis reveals that the cryogenic permeability, as affected by ice formation in the pore system, plays a crucial role in determining the pessimum concentration. A decrease in porosity and critical pore diameter reduces the cryogenic permeability, resulting in lower liquid absorption at low concentrations, and increasing the pessimum concentration.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107945"},"PeriodicalIF":10.9,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134115","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

Surface treatment of 3DPC interlayers with silicate-based solution for enhanced interfacial bonding 用硅酸盐基溶液对3DPC中间层进行表面处理以增强界面粘合

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-26 DOI: 10.1016/j.cemconres.2025.107948

Rue Munemo, Jacques Kruger, Gideon P.A.G. van Zijl

{"title":"Surface treatment of 3DPC interlayers with silicate-based solution for enhanced interfacial bonding","authors":"Rue Munemo, Jacques Kruger, Gideon P.A.G. van Zijl","doi":"10.1016/j.cemconres.2025.107948","DOIUrl":"10.1016/j.cemconres.2025.107948","url":null,"abstract":"<div><div>The unavoidable challenge of weakened interlayers in 3D Concrete Printing yields diminished mechanical performance due to compromised micro- and macrostructural properties that are a culmination of the material and process parameters, in conjunction with ambient environmental conditions. A bond enhancement technique is proposed that is characterised by the surface treatment of interlayer surfaces with a silicate-based solution with the intention of densifying and improving the cementitious matrix in the interlayer region. After applying the surface treatment, the mechanical properties were assessed through compression and direct tensile tests. For microstructural characterisation, SEM/EDS analysis was performed to quantify the hydration products and their morphology in tandem with XCT analysis to assess the pore structure of the interlayer region. The surface treatment technique strengthened the interfaces, yielding up to 126 % bond strength improvement. Furthermore, the interlayer region is densified, with a marked decrease in total pore volume, as well as largest pore size observed. Moreover, the pore structure is more homogenous after the application of surface treatment.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107948"},"PeriodicalIF":10.9,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134116","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

Editorial Le Chatelier 2023 《Le Chatelier 2023》编辑

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-26 DOI: 10.1016/j.cemconres.2025.107925

引用次数: 0

Durability of cementitious binders with blast furnace slag in deep sea conditions: Analysis of microstructure and phase transformation 深海条件下高炉矿渣胶凝结合料的耐久性：微观结构和相变分析

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-22 DOI: 10.1016/j.cemconres.2025.107942

Keisuke Takahashi , Yuichiro Kawabata , Mari Kobayashi , Takafumi Kasaya , Shintaro Miyamoto , Hong S. Wong

{"title":"Durability of cementitious binders with blast furnace slag in deep sea conditions: Analysis of microstructure and phase transformation","authors":"Keisuke Takahashi , Yuichiro Kawabata , Mari Kobayashi , Takafumi Kasaya , Shintaro Miyamoto , Hong S. Wong","doi":"10.1016/j.cemconres.2025.107942","DOIUrl":"10.1016/j.cemconres.2025.107942","url":null,"abstract":"<div><div>Portland cement-blast furnace slag (PC-BFS) cement-based materials exhibit good durability in shallow marine environments but their performance in the deep-sea is poorly understood. This study investigates the degradation of PC-BFS cement pastes after one-year exposure in a deep-sea field site under high hydraulic pressure (3515 m depth) and low temperature (2 °C) conditions. The results show that the main degradation mechanisms involve ettringite formation and Ca leaching, driven by low-temperature seawater ingress under pressure. SEM-EDS and XRD analyses revealed distinct microstructural changes such as Mg and Al enrichment and sulfate/chloride incorporation in BFS rims. Fluorescence imaging confirmed complete seawater infiltration, facilitating BFS dissolution and reprecipitation cycles. The findings highlight the vulnerability of PC-BFS systems to ettringite-induced damage due to their high alumina and low sulfate balance. These insights inform strategies to optimise cementitious materials for deep-sea applications under extreme environments.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107942"},"PeriodicalIF":10.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114430","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

Anomalous time-constant on mortar/electrolyte interface and its influence on LPR and EIS measurement of rebar corrosion 砂浆/电解质界面异常时间常数及其对钢筋腐蚀LPR和EIS测量的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-21 DOI: 10.1016/j.cemconres.2025.107930

Zhangmin Zhang, Qiang You, Yuchen Hu, Guoqing Geng

引用次数: 0

A unified pore structure-based model for diffusion coefficient of unsaturated cementitious materials 基于孔隙结构的非饱和胶凝材料扩散系数统一模型

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-20 DOI: 10.1016/j.cemconres.2025.107943

Zushi Tian, Xiaojuan Kang, Hailong Ye

{"title":"A unified pore structure-based model for diffusion coefficient of unsaturated cementitious materials","authors":"Zushi Tian, Xiaojuan Kang, Hailong Ye","doi":"10.1016/j.cemconres.2025.107943","DOIUrl":"10.1016/j.cemconres.2025.107943","url":null,"abstract":"<div><div>The diffusion coefficient of unsaturated cementitious materials is a crucial factor in assessing their transport-related properties for durability evaluation. However, predicting the diffusion coefficient of unsaturated cementitious media through mathematical modeling is challenging due to the variability of fitting parameters in existing models. This work explores the impact of pore structure and hydration product composition on the diffusion coefficient and corrosion of steel in cementitious materials, particularly under an unsaturated state. The findings reveal that there is no substantial difference in the diffusion mechanisms between saturated and unsaturated cementitious materials, once the roles of capillary and gel liquids are distinguished. Therefore, the same Archie's equation, with consistent fitting parameters, can be used to determine the diffusion coefficient of both saturated and unsaturated cementitious materials. The variability of fitting parameters in the saturation function primarily arises from the varying percentage of capillary pores in different cementitious microstructures. Additionally, the new unified pore structure-based model of diffusion coefficient can be used to accurately predict the corrosion rate of steel embedded in unsaturated cementitious materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107943"},"PeriodicalIF":10.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090179","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

Effect of metakaolin and fly ash on the early hydration and pore structure of Portland cement 偏高岭土和粉煤灰对硅酸盐水泥早期水化及孔隙结构的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-20 DOI: 10.1016/j.cemconres.2025.107928

Vanda Papp , Ioan Ardelean , Anna Bulátkó , Krisztina László , Attila Csík , Róbert Janovics , Mónika Kéri

{"title":"Effect of metakaolin and fly ash on the early hydration and pore structure of Portland cement","authors":"Vanda Papp , Ioan Ardelean , Anna Bulátkó , Krisztina László , Attila Csík , Róbert Janovics , Mónika Kéri","doi":"10.1016/j.cemconres.2025.107928","DOIUrl":"10.1016/j.cemconres.2025.107928","url":null,"abstract":"<div><div>Substituting cement with pozzolans is important for various applications, like radioactive waste management. In this study, 10–30 % metakaolin and fly ash were added to Portland cement to gain insight into their effects on the structure formation, pore structure, and surface properties of cement. Early hydration of these composites was monitored using NMR relaxometry, showing that metakaolin exhibited pozzolanic activity after 8 h, while filler effect was observed for fly ash. FFC NMR and <em>T</em><sub><em>1</em></sub><em>-T</em><sub><em>2</em></sub> correlation relaxometry revealed stronger water-solid interaction for the composites compared to pure cement. The dominance of the CSH gel pores increased with the additives in dry and wet state. Water diffusion in the capillary pores, followed by H<sub>2</sub>O-D<sub>2</sub>O exchange, was slower in metakaolin composites than in fly ash containing samples. The novel combination of NMR, SEM and N<sub>2</sub> porosimetry showed an advantage of metakaolin additive over fly ash for the long-term safe disposal of radioactive waste.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"196 ","pages":"Article 107928"},"PeriodicalIF":10.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090178","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