Cement & concrete composites最新文献

{"title":"Low-velocity impact behavior of functionally graded cement-based composites: Combining SFRC, UHPC and textile-reinforced UHPC","authors":"Júlio Jorge Braga de Carvalho Nunes ,&nbsp;Felipe Rodrigues de Souza ,&nbsp;Pablo Augusto Krahl ,&nbsp;Rebecca Mansur de Castro Silva ,&nbsp;Pâmela Pires de Paula ,&nbsp;Flávio de Andrade Silva","doi":"10.1016/j.cemconcomp.2025.106079","DOIUrl":"10.1016/j.cemconcomp.2025.106079","url":null,"abstract":"<div><div>Functionally graded cement-based materials can be designed to exhibit high energy dissipation capacity by applying materials in specific positions according to the loading protocol. A layer of Ultra-High-Performance Concrete (UHPC) combined with carbon textiles positioned in the most critical zone is a promising solution to improve the behavior of cement-based composites against impact, which has not yet been fully clarified. This study presents a novel two-layer composite approach, combining Steel Fiber Reinforced Concrete (SFRC) with UHPC and carbon textiles, tested under drop weight impact. Three different energy levels were investigated: 112.8, 225.6, and 338.4 J. The UHPC thin layers were reinforced with smooth or steel hooked end fibers, and a group was combined with Textile Reinforced Concrete (TRC). SFRC and UHPC were cast simultaneously, improving the bond between the matrices. The results highlight that SFRC + UHPC with steel hooked fibers have better impact performance than SFRC + UHPC with smooth fibers, exhibiting better crack opening control, higher impact resistance, and lower deflection. Additionally, the same trend was observed when the UHPC layer was reinforced with TRC, which demonstrated a significant reduction in residual displacements and crack openings, as well as improved energy absorption capacity, with increases of up to 370% compared to conventional specimens, highlighting their potential for high-impact applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106079"},"PeriodicalIF":10.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827213","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}

{"title":"Nano- and micro-characterisation on the heterogeneity of ITZs in recycled lump concrete","authors":"Hanbing Zhao ,&nbsp;Yixiang Gan ,&nbsp;Fulin Qu ,&nbsp;Zhuo Tang ,&nbsp;Shuhua Peng ,&nbsp;Yangqiao Chen ,&nbsp;Wengui Li","doi":"10.1016/j.cemconcomp.2025.106078","DOIUrl":"10.1016/j.cemconcomp.2025.106078","url":null,"abstract":"<div><div>Recycled lump concrete (RLC) is a new sustainable construction material for filling large-sized demolished concrete lump (DCL) piles with fresh mortar or concrete. Due to the differences from conventional concrete casting technology, the heterogeneity and cohesion performance of the interfacial transition zones (ITZs) require further investigation. In this study, two types of self-compacting mortar (SCPM) were designed using blends of cement, recycled sand/recycled powder (RS/RP), and fly ash as raw materials. The filling performance of the SCPM was evaluated based on the microstructure, micromechanical properties and phase distribution within the ITZs and the adjacent matrix surrounding DCLs. Both types of SCPM effectively fill the gaps between DCLs, observed in the appearance of specimens. However, the bonding strength of bottom and oblique bottom ITZs of RLC prepared by SCPM without fly ash and superplasticizer was poor, making it impossible to produce ITZ samples from these two locations successfully. The heterogeneity and cohesion strength of the ITZs surrounding the DCLs depends on the distribution of pores and grains. Grains, including RP and fly ash, accumulated at the top and oblique top sides of the DCL due to sedimentation. Fly ash and RP effectively promoted the healing of micro-pores and cracks around DCLs but had a limited effect on pores and cracks with an average equivalent diameter greater than 1 μm. In summary, the ITZs at the top and oblique top sides of the DCLs had a denser microstructure and better bonding performance than those at other locations around the DCLs.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106078"},"PeriodicalIF":10.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823025","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}

{"title":"Influence of polyoxymethylene fibers on autogenous shrinkage, tensile creep, and cracking resistance of ultra-high performance concrete","authors":"Dejian Shen ,&nbsp;Haoze Shao ,&nbsp;Ying Huang ,&nbsp;Ci Liu ,&nbsp;Quan Huang ,&nbsp;Chen Zhao","doi":"10.1016/j.cemconcomp.2025.106090","DOIUrl":"10.1016/j.cemconcomp.2025.106090","url":null,"abstract":"<div><div>Supersulfated cement (SSC) has been utilized in ultra-high performance concrete (UHPC) to replace Portland cement to reduce carbon dioxide emissions and energy consumption. Polyoxymethylene fibers (POMF) have been added in UHPC to decrease shrinkage and increase tensile strength. Autogenous shrinkage and tensile creep are important factors in evaluating the cracking resistance of UHPC. However, investigations on the impact of POMF on the autogenous shrinkage, tensile creep, and cracking resistance of UHPC prepared by SSC (UHPC-SSC) remain insufficient, which limits the application of POMF on UHPC-SSC. Therefore, investigations on the impact of POMF on the autogenous shrinkage, tensile creep, and cracking resistance of UHPC-SSC by using temperature stress test machine (TSTM) were systematically carried out in this study. Meanwhile, the workability and mechanical properties tests were also conducted. Test results indicated that the splitting tensile strength and compressive strength of UHPC-SSC first increased and then decreased with the increase of the contents of POMF. In addition, the autogenous shrinkage of UHPC-SSC decreased by 31.87 % when the content of POMF was 3 %. Furthermore, the basic tensile creep, creep-shrinkage ratio, and specific tensile creep of UHPC-SSC decreased with the increase of the contents of POMF. Incorporating POMF delayed the cracking time of UHPC-SSC, and the cracking resistance first increased and then decreased with the increasing contents of POMF.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106090"},"PeriodicalIF":10.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820030","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}

{"title":"Impact of inherent characteristics of raw laterite and its calcination on properties of geopolymers","authors":"Sylvain Tome ,&nbsp;Jean Noel Y. Djobo ,&nbsp;Christelle N. Bewa ,&nbsp;Hong Wong ,&nbsp;Claus H. Rüscher","doi":"10.1016/j.cemconcomp.2025.106082","DOIUrl":"10.1016/j.cemconcomp.2025.106082","url":null,"abstract":"<div><div>Laterite is a sustainable solid precursor for synthesising geopolymers with interesting properties. However, the intrinsic characteristics of raw laterite and their impact on the reactivity of calcined laterite in an alkaline medium are poorly understood. This research aims to investigate the chemical, mineralogy and physical characteristics of eight (8) raw lateritic soils from three regions of Cameroon and their calcination products to lay down the knowledge base for mainstreaming this material as a solid precursor in geopolymer synthesis. The mineralogy and chemistry of raw laterites are correlated with those calcined laterites along with their reactivity and reaction kinetic in an alkaline solution, and the 28-day compressive strength of resulting geopolymers. The results show that the degree of laterization influences the mineralogy and chemistry of raw laterites. The partial transformation of goethite or gibbsite into hematite or γ-Al₂O₃ respectively during calcination impairs the evolution of the amorphous phase content of calcined laterite. This hinders the reaction kinetics and compressive strength development. The 28-day compressive strength of the geopolymer strongly depends on the composition of the amorphous phase of calcined laterite with the highest strength achieved for samples with higher amounts of reactive Si, Al and Fe. The 1:1 clay minerals content of the raw laterite induces higher reactivity of the calcined laterite and higher compressive strength of the resulting geopolymer.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106082"},"PeriodicalIF":10.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819937","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}

{"title":"Stabilization of Cr3+ using iron rich slag-derived phosphate cement: An integrated solution for heavy metals and hazardous solid wastes","authors":"Ting Huang ,&nbsp;Hongyan Ma ,&nbsp;Zhongqiu Luo ,&nbsp;Xintao Zhou ,&nbsp;Zhengqing He ,&nbsp;Peiwen Lv ,&nbsp;Xiunan Cai ,&nbsp;Pingyan Wang","doi":"10.1016/j.cemconcomp.2025.106089","DOIUrl":"10.1016/j.cemconcomp.2025.106089","url":null,"abstract":"<div><div>A novel iron-based phosphate cement (IPC), derived from iron-rich smelting slag (ISS), was developed as a sustainable and efficient binder for the stabilization/solidification of trivalent chromium (Cr³⁺). The mechanical properties, hydration behavior, microstructure, leaching toxicity, chromium chemical forms, and environmental safety of chromium-stabilized iron phosphate cement (CIPC) were thoroughly evaluated. The results showed that, with a mass ratio of ISS to ammonium dihydrogen phosphate (ADP) of 2.0, and even with the addition of 20 % chromium nitrate nonahydrate (CN), the compressive strength of CIPC reached 4.2 MPa after curing for 28 d. Furthermore, chromium leaching was well below 1 mg/L, significantly lower than the GB 5085.3–2007 standard limit of 15 mg/L, demonstrating the effective encapsulation of Cr³⁺ due to IPC's high early strength. In the IPC system, Cr³⁺ was primarily stabilized by forming CrPO₄ and Cr_xFe_1-x(OH)₃ co-precipitates, which were further solidified through the physical encapsulation of IPC hydration products, such as (NH₄)₂Fe(PO₃OH)₂·4H₂O, (NH₄)(Mg,Ca)PO₄·H₂O, and FePO₄. This process resulted in a solidification efficiency of up to 99 %. BCR analysis confirmed that more than 98 % of the chromium in the CIPC remained in a stable residual form. Finally, the ecological risk index (<em>PERI</em>) was found to be 23.52, far below the safety threshold of 150, indicating the solidified material's long-term environmental safety. This study provides an innovative approach for the reutilization of ISS while effectively stabilizing/solidifying chromium.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106089"},"PeriodicalIF":10.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823027","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}

{"title":"A rheometric approach to investigate the effect of cellulose ether on crack mitigation in earth-based concrete","authors":"Julie Assunção,&nbsp;Coralie Brumaud,&nbsp;Guillaume Habert","doi":"10.1016/j.cemconcomp.2025.106077","DOIUrl":"10.1016/j.cemconcomp.2025.106077","url":null,"abstract":"<div><div>This study investigates the impact of cellulose ethers (CE), particularly Hydroxyethyl Methyl Cellulose (HEMC), on the properties of earth-concrete mixes, focusing on both micro and macro-scale analyses. At the micro-scale, CE's influence on rheological responses and particle interactions was examined, revealing the formation of a robust network that enhances critical strain and yield stress, particularly with higher viscosity polymers. Analysis of total organic carbon in the pore solution indicated partial polymer adsorption, crucial for bridging solid particles and strengthening interparticle interactions. Moving to the macro-scale evaluation, in terms of compressive strength at 28 days, a notable increase was observed. Regarding shrinkage reduction, no clear correlation was found between polymer addition and shrinkage decrease in both stabilized and unstabilized earth mixes. Moreover, CE significantly mitigated crack formation in macro-scale samples, with the most pronounced effect seen in stabilized earth mixes—83% of tested mixes showed improvement compared to 45% in unstabilized mixes. The presence of CaCO₃ formation further suggests its influence when combined with cellulose-based polymers. In conclusion, CE enhances the mechanical properties of earth-concrete mixes, offering promising applications in sustainable construction practices.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106077"},"PeriodicalIF":10.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820031","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}

{"title":"Enhanced elastomer-like auxetic cementitious materials through strain-hardening cementitious composites (SHCC) with extended softening properties","authors":"Jinbao Xie,&nbsp;Shan He,&nbsp;Yading Xu,&nbsp;Zhaozheng Meng,&nbsp;Wen Zhou,&nbsp;Erik Schlangen,&nbsp;Branko Šavija","doi":"10.1016/j.cemconcomp.2025.106069","DOIUrl":"10.1016/j.cemconcomp.2025.106069","url":null,"abstract":"<div><div>Auxetic cementitious cellular composites (ACCCs) exhibit hinge-type recoverable deformation during auxetic behavior phase, a rare pseudo-elastic property in cementitious materials. However, their low load-bearing capacity during this phase restricts their use in high-load applications. This study developed ACCCs using strain-hardening cementitious composites (SHCCs) with short (SHCC-SS) and long (SHCC-LS) softening tails, fabricated by additive manufacturing-assisted casting. Uniaxial compression tests employing Digital Image Correlation (DIC) evaluated their compressive behavior, peak strength, Poisson's ratio variation, and energy dissipation. Cyclic tests after pre-compression assessed their recoverable deformation resilience, with fiber bridging at joint cracks examined using digital optical microscope. Results were compared to a reference using fiber-reinforced cementitious materials with strain softening (SS). Compared to the reference (SS), ACCCs using SHCC mixtures exhibit superior load-bearing capacity and stable auxetic behavior under compression. After self-contact, they maintain a negative Poisson's ratio up to a considerably high compressive strain, preventing splitting failure and preserving structural integrity. This is because incorporating SHCC enables greater joint rotation by promoting multiple cracks with strain hardening, which delays primary crack formation and reduces its opening. During cyclic tests, P1-shaped ACCCs with SHCC-LS and SHCC-SS enhance the elasticity modulus of recoverable deformation by 4.8 and 3.0 times, respectively, compared to SS. SHCC-LS outperforms SHCC-SS in compressive resilience due to its prolonged softening tail, which improves fiber bridging in primary cracks and increases rotational stiffness in hinge joints. SHCC mixtures with initial strain hardening and extended softening enable scalable design of advanced auxetic cementitious materials across various load levels.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106069"},"PeriodicalIF":10.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814188","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}

{"title":"Discussion of the implementation of water compensation methods for recycled aggregate concrete: A critical review","authors":"Xiaoguang Chen ,&nbsp;Haoyu Hao ,&nbsp;Jorge de Brito ,&nbsp;Gang Liu ,&nbsp;Jianyun Wang","doi":"10.1016/j.cemconcomp.2025.106080","DOIUrl":"10.1016/j.cemconcomp.2025.106080","url":null,"abstract":"<div><div>High water absorption is a typical characteristic of most types of recycled aggregate (RA). In the production of recycled aggregate concrete (RAC), it is common practice to either wet the RA prior to mixing or increase the amount of water during mixing. Those two procedures, often referred to as water compensation methods, can bring the effective water-cement ratio of RAC to the target value. Nevertheless, there is some uncertainty among researchers and manufacturers regarding the exact amount of water that needs to be compensated for when implementing water compensation methods, which leads to errors in the effective water-cement ratio of RAC. This review article identifies part of the uncertainty that can noticeably affect the performance of RAC. The root of that problem lies in the current knowledge gaps in the dynamic migration laws of water for different water compensation methods and their effects on the new interfacial transition zone and new cement paste. It is anticipated that this review will encourage efforts to improve accuracy in the use of water compensation methods, thereby contributing to the quality control and scaling up of RAC.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106080"},"PeriodicalIF":10.8,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806187","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}

{"title":"Fully coupled physicochemical-mechanical modeling of sulfate attack-induced expansion in cement-based materials","authors":"Motohiro Ohno ,&nbsp;Koichi Maekawa","doi":"10.1016/j.cemconcomp.2025.106076","DOIUrl":"10.1016/j.cemconcomp.2025.106076","url":null,"abstract":"<div><div>Sulfate attack-induced expansion in cementitious materials is a complex physicochemical-mechanical phenomenon influenced by numerous factors. To deepen our understanding of this deterioration process, multiphysics modeling and simulations that can consider various material, structural, environmental conditions are invaluable. This study presents a fully coupled physicochemical-mechanical model to simulate sulfate attack-induced expansion in cement-based materials. The proposed model integrates multiscale models of cement hydration, pore structure formation, moisture and ion transport within the cement matrix, and the geochemical code PHREEQC to compute chemical equilibrium in pore solutions. The model assumes that secondary formation of both ettringite and gypsum contributes to expansion. The mechanical response is simulated using elasto-plastic and damaging constitutive models for compression, tension, and shear in cement-based materials. In cases of cracking, the reactive transport model adjusts the mass-transfer properties of the material accordingly. Model validation against experimental data demonstrated that the proposed model reasonably predicts expansion trends under various conditions. Furthermore, the simulations suggested that sulfate attack-induced expansion is primarily driven by secondary ettringite formation, but also quantitatively showed the significant contribution of secondary gypsum under high sulfate ion concentrations. Sensitivity analysis also revealed the significant impact of mineral compositions of cement, particularly tricalcium aluminate (C₃A) and tricalcium silicate (C₃S) contents and the initial amount of gypsum in cement. This study provides a baseline for further investigations aimed to link sulfate attack-induced material deterioration with structural degradation, facilitating the assessment of structural integrity and remaining service life of deteriorated concrete structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106076"},"PeriodicalIF":10.8,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782803","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}

{"title":"Fire performance of concrete structures incorporating FRP reinforcement: State-of-the-art and knowledge gaps","authors":"V.K.R. Kodur ,&nbsp;M.Z. Naser ,&nbsp;H.S. Kim","doi":"10.1016/j.cemconcomp.2025.106074","DOIUrl":"10.1016/j.cemconcomp.2025.106074","url":null,"abstract":"<div><div>Fiber reinforced polymer (FRP) composites have emerged as a promising material in modern construction, particularly in enhancing the durability and performance of concrete structures. This review paper offers a comprehensive analysis of FRP composites, focusing on their properties at both room and elevated temperatures and the critical performance issues that arise under varying thermal conditions when used as reinforcing or strengthening systems in concrete structures. The discussion encompasses FRP composites' combustibility, thermal, mechanical, and bond properties, emphasizing their behavior at both material and structural levels when incorporated into concrete structures. A detailed review of previous studies on fire resistance of FRP-incorporated structural members, including fire tests, numerical studies, and existing design provisions in codes and standards, provides a broad understanding of the current landscape. Results from these studies are utilized to evaluate the fire behavior of FRP-incorporated concrete structures and to examine the overall fire performance of such structures. In addition, strategies for achieving the necessary fire resistance and methods for evaluating fire resistance are summarized. Finally, critical knowledge gaps for advancing the state-of-the-art on fire performance of FRP-incorporated concrete structures are presented.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106074"},"PeriodicalIF":10.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776045","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}