Cement & concrete composites最新文献_第5页

Microstructure transformation of MCM-41 modified cement paste subjected to thermal load and modelling of its pore size distribution MCM-41改性水泥浆体在热载荷作用下的微观结构变化及孔径分布建模

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105930

Maciej Szeląg, Patryk Rumiński, Rafał Panek

{"title":"Microstructure transformation of MCM-41 modified cement paste subjected to thermal load and modelling of its pore size distribution","authors":"Maciej Szeląg, Patryk Rumiński, Rafał Panek","doi":"10.1016/j.cemconcomp.2025.105930","DOIUrl":"10.1016/j.cemconcomp.2025.105930","url":null,"abstract":"<div><div>This study examines the effects of highly reactive, mesoporous MCM-41 silica on the thermal resistance and microstructural stability of Portland cement paste (CP). The motivation is to enhance cement composites (CC) properties using supplementary cementitious materials (SCMs), addressing environmental challenges from global cement production. The research involved modifying CP with 0–2 wt% MCM-41 and subjecting it to thermal loads from 20 °C to 700 °C. Evaluations included compressive and tensile strengths, density, water absorption, and shrinkage. Characterization techniques like X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP) analysed phase composition and pore distribution. Results showed that MCM-41 significantly improved compressive strength, with a 26.9 % increase at 0.75 wt% content. Tensile strength also improved up to 33.8 % for 0.25–1 wt% MCM-41 content. Thermal stability tests indicated enhanced performance in the 200–500 °C range by reducing microcrack formation. XRD analysis revealed that MCM-41 influenced the phase composition, particularly delaying the thermal decomposition of portlandite and enhancing the stability of calcium silicate hydrates (CSH). Microstructural analysis revealed a denser, more cohesive cement matrix with reduced water absorption and shrinkage, enhancing durability. Additionally, MIP studies showed that MCM-41 contributed to a finer pore structure, improving the overall mechanical properties despite increased porosity. To supplement the findings, peak models have been tested to assess the ability to numerically predict pore size distribution of thermally loaded CP. Thus, MCM-41 is effective for improving the thermal and mechanical properties of CP, offering potential for applications in thermally stressed environments, contributing to more sustainable construction materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105930"},"PeriodicalIF":10.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937251","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

Insights into the synergistic action of initial hydration and subsequent carbonation of Portland cement 硅酸盐水泥初始水化和后续碳酸化的协同作用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-09 DOI: 10.1016/j.cemconcomp.2025.105924

Jionghuang He, Yingliang Zhao, Yong Tao, Peiliang Shen, Chi Sun Poon

{"title":"Insights into the synergistic action of initial hydration and subsequent carbonation of Portland cement","authors":"Jionghuang He, Yingliang Zhao, Yong Tao, Peiliang Shen, Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.105924","DOIUrl":"10.1016/j.cemconcomp.2025.105924","url":null,"abstract":"<div><div>Pretreatment-induced initial hydration would significantly influence subsequent carbonation. However, the evolution of microstructure and performance resulting from the synergistic action of hydration and carbonation remains systematically unexplored. This study investigates carbonation kinetics, microstructure and micro/macro mechanical properties of carbonated cement pastes (CCPs) under the synergistic action of initial hydration and subsequent carbonation, while elucidating the underlying mechanisms. The results revealed that unhydrated cement exhibited a peak carbonation rate of 0.65 W/g, increasing by approximately 83 % when the cement underwent an 8 h of initial curing, demonstrating the enhancement in the carbonation reactivity due to initial hydration. However, the carbonation efficiency of CCPs increased initially and then decreased as initial hydration extended. This trend emerged because initial hydration enhanced carbonation reactivity, whereas excessive hydration concurrently obstructed CO<sub>2</sub> transport. Furthermore, optimal initial hydration was essential for the synergistic interaction between hydration and carbonation, resulting in reduced porosity and a more homogeneous microstructure, as well as improved mechanical properties. These findings underscore the need to carefully consider the synergistic action of initial hydration and subsequent carbonation when designing pretreatment protocols.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105924"},"PeriodicalIF":10.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937245","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

Mechanical performance enhancement of UHPC via ITZ improvement using graphene oxide-coated steel fibers 利用氧化石墨烯包覆钢纤维改善超高性能聚乙烯的机械性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-08 DOI: 10.1016/j.cemconcomp.2025.105931

Yuan Gao , Zhangjianing Cheng , Jiajian Yu , Xiaonong Guo , Yanming Liu , Weiqiang Chen

{"title":"Mechanical performance enhancement of UHPC via ITZ improvement using graphene oxide-coated steel fibers","authors":"Yuan Gao , Zhangjianing Cheng , Jiajian Yu , Xiaonong Guo , Yanming Liu , Weiqiang Chen","doi":"10.1016/j.cemconcomp.2025.105931","DOIUrl":"10.1016/j.cemconcomp.2025.105931","url":null,"abstract":"<div><div>By virtue of its superior strength, high toughness, and low porosity, ultra-high-performance concrete (UHPC) has a wide range of application prospects in construction engineering. However, the interfacial transition zone (ITZ) formed between the cementitious matrix and steel fiber seriously restricts the steel fiber's strength utilization rate in UHPC. Hence, in this work, graphene oxide (GO) is employed to be coated on the steel fiber surface to strengthen the UHPC. The results demonstrate that through a three-step GO coating approach, the roughness and hydrophilicity of the steel fiber surface can be enhanced by about 280.6 % and 40.6 % compared with plain steel fiber. The coated GO can provide pore-infilling and nucleation effects during the hydration processes of the UHPC, thus decreasing the porosity by 37.5 % compared with non-GO reinforcement. After the three-step coating treatment, the compressive and bending strength of the coated-GO reinforced UHPC is enhanced by 33.7 % and 26.2 %, respectively. The molecular dynamic simulation results further reveal that benefiting from the crack-bridging effects of the coated GO, the interface between the steel fiber surface and cement matrix is prone to a ductile failure, with the failure energy of the C-S-H composites increasing by about 320%–1340 %. The findings advanced by this work can enhance the understanding of nano-cement technology and promote the potential application of the GO-coated fiber to generate high-performance UHPC.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105931"},"PeriodicalIF":10.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937250","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

Rheology and mechanical properties of limestone calcined clay based engineered cementitious composites with nano CaCO3 石灰石煅烧粘土基纳米碳酸钙工程胶凝复合材料的流变学和力学性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-07 DOI: 10.1016/j.cemconcomp.2025.105923

Yuting Wang , Meng Chen , Tong Zhang , Mingzhong Zhang

{"title":"Rheology and mechanical properties of limestone calcined clay based engineered cementitious composites with nano CaCO3","authors":"Yuting Wang , Meng Chen , Tong Zhang , Mingzhong Zhang","doi":"10.1016/j.cemconcomp.2025.105923","DOIUrl":"10.1016/j.cemconcomp.2025.105923","url":null,"abstract":"<div><div>The application of advanced binder consisting of limestone, calcined clay and cement (LC<sup>3</sup>) promotes the development of low-carbon engineering cementitious composites (ECC). In order to improve the comprehensive properties of LC<sup>3</sup>-ECC, this paper investigates the feasibility of using nano CaCO<sub>3</sub> (NC) to replace the limestone powder up to 20 % for LC<sup>3</sup>-ECC preparation through rheology and mechanical tests along with the micro-design calculation and microstructure analysis. Results indicate that the yield stress and plastic viscosity of LC<sup>3</sup>-ECC are largely improved with increasing NC replacement rate. Meanwhile, the compressive, flexural and tensile strengths of LC<sup>3</sup>-ECC with NC raise firstly and then decline, while the strengths are maximum at NC replacement rate of 5 % but the tensile strain capacity remains at 2.3 %. The hydration promotion effect and pore structure refinement effect of NC particles improve the mechanical strength of LC<sup>3</sup>-ECC, but the performance degradation occurs when the replacement rate of the NC exceeds 10 %. In micromechanics, the fibre bridging stress of LC<sup>3</sup>-ECC reinforced by NC with replacement rate of 5 % decreases by 18.5 % compared to that of without NC, but it grows with the increasing NC replacement rate. In combination with fresh, hardened and microstructure behaviour, LC<sup>3</sup>-ECC exhibits the optimum mechanical behaviour with the NC replacement rate of 10 %–15 %.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105923"},"PeriodicalIF":10.8,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935162","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

Carbon capture and storage CO2 foam concrete towards higher performance: Design, preparation and characteristics 面向更高性能的碳捕获和封存二氧化碳泡沫混凝土：设计、制备和特性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-07 DOI: 10.1016/j.cemconcomp.2025.105925

Dingqiang Fan , Jian-Xin Lu , Xue-Sen Lv , Takafumi Noguchi , Rui Yu , Chi Sun Poon

{"title":"Carbon capture and storage CO2 foam concrete towards higher performance: Design, preparation and characteristics","authors":"Dingqiang Fan , Jian-Xin Lu , Xue-Sen Lv , Takafumi Noguchi , Rui Yu , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.105925","DOIUrl":"10.1016/j.cemconcomp.2025.105925","url":null,"abstract":"<div><div>This study introduces a novel strategy for carbon capture and utilization by incorporating CO<sub>2</sub> into foams to develop CO<sub>2</sub> foam concrete (CFC) with high performance. A conceptual design approach for CFC was first proposed by incorporating tailor-made CO<sub>2</sub> foam into an optimized cement-based paste. The engineered CO<sub>2</sub> foam exhibited fine size and good stability, but increasing CO<sub>2</sub> concentration decreased stability. Then, the CO<sub>2</sub> foam was used to fabricate CFC with high strength (about twice that of normal foam concrete at a similar density), excellent durability (comparable to normal concrete), and low thermal conductivity. Moreover, it was demonstrated that CO<sub>2</sub> foam induced positive internal carbonation effects to further enhance the CFC performance. These effects included promoting cement hydration efficiency and generating CaCO<sub>3</sub> on the foam wall for strength enhancement. Also, the rational use of CO<sub>2</sub> foams optimized the CFC pore structures, including reducing porosity, refining pore size, and improving pore uniformity. The CFC exhibited exceptional carbon capture, sequestering 87 kg of CO<sub>2</sub> per m<sup>3</sup> of concrete by internal and external carbonations (active carbon reduction), and could reduce electricity consumption and the corresponding carbon emissions (indirect carbon reduction). This innovative material offers a promising pathway towards sustainable construction and carbon neutrality.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105925"},"PeriodicalIF":10.8,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935161","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

Activation of BOF slag with dipotassium hydrogen phosphate: Enhancing hydration, carbonation resistance, and heavy metal leaching 磷酸氢二钾活化转炉炉渣：增强水化、抗碳化和重金属浸出

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105922

Yanjie Tang , Katrin Schollbach , Sieger van der Laan , Wei Chen

{"title":"Activation of BOF slag with dipotassium hydrogen phosphate: Enhancing hydration, carbonation resistance, and heavy metal leaching","authors":"Yanjie Tang , Katrin Schollbach , Sieger van der Laan , Wei Chen","doi":"10.1016/j.cemconcomp.2025.105922","DOIUrl":"10.1016/j.cemconcomp.2025.105922","url":null,"abstract":"<div><div>This study investigates the hydration of basic oxygen furnace (BOF) slag activated by dipotassium hydrogen phosphate (DKP) up to 3 wt%. The findings reveal that DKP-activated BOF slag pastes exhibit improved strength, leaching behavior, and carbonation resistance. DKP-activated BOF slag pastes facilitate the completion of the main exothermic reaction within 3 days. Increasing DKP from 1 to 3 wt% extends the induction period while enhancing overall hydration heat. This is attributed to the consumption of C<sub>2</sub>S and brownmillerite, and the formation of hydrogarnet, C-S-H gel, and layered double hydroxides (LDHs). Concomitantly, porosity reduces from 40.73 to 22.36 %, leading to significant strength gaining from 1.9 to 42.5 MPa over 28 days. Moreover, DKP-containing samples exhibit satisfactory carbonation resistance and limited heavy metal leaching, complying with the Dutch Soil Quality Decree (SQD). The study highlights the potential of phosphate activation to enhance the durability and environmental performance of BOF slag-based materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105922"},"PeriodicalIF":10.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142928992","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

Comparative analysis of carbonation strengthening mechanisms in full solid waste materials: Steel slag vs. carbide slag 全固体废弃物中碳化强化机理的比较分析：钢渣与电石渣

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105927

Qi Zhang , Pan Feng , Xuyan Shen , Yuxi Cai , Houru Zhen , Zhichao Liu

{"title":"Comparative analysis of carbonation strengthening mechanisms in full solid waste materials: Steel slag vs. carbide slag","authors":"Qi Zhang , Pan Feng , Xuyan Shen , Yuxi Cai , Houru Zhen , Zhichao Liu","doi":"10.1016/j.cemconcomp.2025.105927","DOIUrl":"10.1016/j.cemconcomp.2025.105927","url":null,"abstract":"<div><div>Maximizing the use of solid wastes to replace energy-intensive cement while maintaining the comparable mechanical properties is a promising strategy for developing negative carbon building materials. In this paper, full steel slag/carbide slag blocks were prepared by pressing and subsequent carbonation to enhance mechanical properties and capture CO<sub>2</sub>. The evolution of carbonation degree and compressive strength with varying liquid to solid ratios and carbonation durations were characterized, followed by a comparative analysis of carbonation strengthening mechanisms. The results show that carbonation significantly improves compressive strengths, exhibiting a linear relationship between carbonation degree and compressive strength. The maximum carbonation degrees and compressive strengths achieved were 24.56 % and 79.68 MPa for full steel slag blocks, and 64.46 %, 44.64 MPa for full carbide slag blocks, respectively. Although the maximum carbonation degree of full steel slag blocks is only about one-third of that of the full carbide slag blocks, their superior compressive strength can be attributed to denser microstructures, stronger bonding properties between steel slag particles and carbonated products, and a larger effective elastic modulus. This study provides a new insight into the carbonation strengthening mechanisms based on the inherent properties of different materials and introduces a novel concept for creating high-performance, eco-friendly building materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105927"},"PeriodicalIF":10.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935085","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-depth analysis of Lime-hemp concrete and water vapor interactions: Effect of water default and prediction of the sorption behavior 石灰-大麻混凝土与水蒸气相互作用的深入分析：水违约的影响和吸附行为的预测

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-06 DOI: 10.1016/j.cemconcomp.2025.105921

Brahim Mazian , Giana Almeida , Nils Frantz , Patrick Perré

{"title":"In-depth analysis of Lime-hemp concrete and water vapor interactions: Effect of water default and prediction of the sorption behavior","authors":"Brahim Mazian , Giana Almeida , Nils Frantz , Patrick Perré","doi":"10.1016/j.cemconcomp.2025.105921","DOIUrl":"10.1016/j.cemconcomp.2025.105921","url":null,"abstract":"<div><div>Lime-hemp concrete (LHC) emerges as a sustainable building material due to its low embodied energy, carbon storage capabilities, and interesting properties for both winter and summer comfort. However, a comprehensive understanding of its moisture behavior is pivotal for its development and application in construction. This study investigates the moisture sorption behavior and isotherm characteristics of LHC across four formulations varying in density (321–478 kg/m³) and binder/particle weight ratios (BP = 1 and 2). Using a strict equilibrium criterion, over 3000 h of Dynamic Vapor Sorption (DVS), experiments revealed some formulations failed to reach equilibrium during adsorption at RH levels above 60 %, indicating irreversible processes characterized by offsets in equilibrium moisture content (EMC) at 0 % RH after a complete cycle. These phenomena were attributed to insufficient water availability during mixing and/or excessive compaction. Formulations with a higher weight ratio (B/P = 2) and significant compaction, such as BP2_420, exhibited the highest desorption offset (7.5 % EMC), while those with a lower B/P weight ratio (B/P = 1), such as BP1_379, showed reduced offsets below 2 %, due to better water distribution. The study also showed that reversible sorption behavior, corrected for offsets, could be accurately described using the Guggenheim-Anderson-de Boer (GAB) model. Finally, the rule of mixtures reliably predicted sorption isotherms by combining the GAB parameters of hemp shive particles and binder, with deviations limited to a maximum error of 2.3 %.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105921"},"PeriodicalIF":10.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142928994","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 soluble phosphate on strength development of anhydrite calcined from phosphogypsum 可溶性磷酸盐对磷石膏煅烧硬石膏强度发展的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-03 DOI: 10.1016/j.cemconcomp.2025.105920

Ying Hua , Zhichao Zhang , Lu Yuan , Jueshi Qian , Yanfei Yue , Zhen Li , Xingwen Jia

{"title":"Effect of soluble phosphate on strength development of anhydrite calcined from phosphogypsum","authors":"Ying Hua , Zhichao Zhang , Lu Yuan , Jueshi Qian , Yanfei Yue , Zhen Li , Xingwen Jia","doi":"10.1016/j.cemconcomp.2025.105920","DOIUrl":"10.1016/j.cemconcomp.2025.105920","url":null,"abstract":"<div><div>The soluble phosphates in phosphogypsum (PG) are generally considered to hinder its utilization without pretreatments. This paper investigated the positive effect of soluble phosphates on the strength development of anhydrite calcined from PG at 800 °C for 1 h. PG, washed PG with different soluble phosphate contents, washed PG added with washed water, and flue gas desulfurization gypsum (FGD) were used to prepare anhydrite. The hydration degree and strength development of anhydrite were measured. The effect mechanism was explored by XRD, FTIR, and SEM. Results showed the 28-day strength decreased from 35.9 MPa to almost no strength when the soluble P<sub>2</sub>O<sub>5</sub> content decreased from 0.7480 % to 0.0471 %. Soluble phosphates in PG would affect the microstructure of anhydrite particles, promoting the strength development, however, they did not affect the strength of anhydrite calcined from FGD. It is concluded that the soluble phosphates in PG are beneficial for manufacturing anhydrite, which is a promising utilization.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105920"},"PeriodicalIF":10.8,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917111","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

Enhancing dispersion and mechanical properties of carbon nanotube-reinforced cement-based material using polymer emulsions 聚合物乳液增强碳纳米管增强水泥基材料的分散性和力学性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-03 DOI: 10.1016/j.cemconcomp.2024.105910

Shi-Wei Zhang , Ru Wang , Jiao-Long Zhang , Yong Yuan

{"title":"Enhancing dispersion and mechanical properties of carbon nanotube-reinforced cement-based material using polymer emulsions","authors":"Shi-Wei Zhang , Ru Wang , Jiao-Long Zhang , Yong Yuan","doi":"10.1016/j.cemconcomp.2024.105910","DOIUrl":"10.1016/j.cemconcomp.2024.105910","url":null,"abstract":"<div><div>This study explores the effect of polymer concentration on the dispersion of carbon nanotubes (CNTs) and the mechanical properties of cement-based materials via tests and molecular dynamics (MD) simulations. The results showed that all three polymers (ethylene-vinyl acetate (EVA), styrene-acrylate (SAE), and styrene-butadiene (SB) copolymers) significantly enhanced CNTs’ dispersion. The key factors driving this improvement are the coordination bond, H-bonds, π-π stacking, and van der Waals forces between the polymer and CNTs, which promote strong adsorption. This reduces the interaction energy generated among the CNTs. Additionally, the combined use of polymers and CNTs improves the mechanical properties of cement-based materials. First, the polymer films and CNTs formed a mesh structure inside the mortar, linking the hydration products, unhydrated cement particles, and aggregates. Secondly, the polymer films wrapped around the surface of the CNTs, which promoted the bond strength between the CNTs and calcium silicate hydrate. The synergistic effect between the polymers and CNTs is a promising approach for the development of advanced cementitious composites. The polymer promoted the dispersion of CNTs, whereas the CNTs compensated for the reduced compressive strength of the polymer-modified mortar and promoted hydration.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105910"},"PeriodicalIF":10.8,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924779","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