Cement & concrete composites最新文献_第5页

An improved experimental technique for dynamic direct tensile testing of concrete 混凝土动态直接拉伸试验技术的改进

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-04 DOI: 10.1016/j.cemconcomp.2025.106075

Mohamed A. Abbas , Rylan D. Chapman , Brett A. Williams , William F. Heard , Xu Nie

{"title":"An improved experimental technique for dynamic direct tensile testing of concrete","authors":"Mohamed A. Abbas , Rylan D. Chapman , Brett A. Williams , William F. Heard , Xu Nie","doi":"10.1016/j.cemconcomp.2025.106075","DOIUrl":"10.1016/j.cemconcomp.2025.106075","url":null,"abstract":"<div><div>Dynamic tensile testing of concrete materials has been proven to be extremely challenging due to their heterogeneity, low tensile strength, and brittleness. The present study introduced an improved experimental technique for the testing of cementitious materials under dynamic direct tensile loading on a Kolsky tension bar. This technique involves using a pair of aluminum adapters attached to the bars, with the concrete specimen secured to these adapters by epoxy adhesive. As a result, specimen detachment and cleaning after the test become much more efficient. However, the proposed technique also presents challenges caused by the inertia forces from the mass of adapters as well as the overestimation of the specimen strain due to the deformation of adapters. These challenges were addressed by modifications to the conventional approach of data post-processing in Kolsky bar experiments. In addition, pulse shaping techniques were utilized to develop an optimal loading wave, thereby enabling the attainment of valid testing conditions. The proposed technique was evaluated through the testing of a steel microfiber reinforced concrete. Our results have demonstrated for the very first time that dynamic stress equilibrium and constant strain rate deformation can be achieved to evaluate concrete on a Kolsky direct tension bar through careful experimental design.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106075"},"PeriodicalIF":10.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782804","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

Bentonite-based LC3 low carbon cement and activation by C-S-H nucleation seeding 水泥与混凝土复合材料膨润土基LC3低碳水泥及其C-S-H成核种子活化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-31 DOI: 10.1016/j.cemconcomp.2025.106073

Diego Vallina , María Dolores Rodríguez-Ruiz , Alejandro Morales-Cantero , Ana Cuesta , Isabel Santacruz , Alessandro Dalla-Libera , Pere Borralleras , Sébastien Dhers , Peter Schwesig , Oliver Mazanec , Miguel A.G. Aranda , Angeles G. De la Torre

{"title":"Bentonite-based LC3 low carbon cement and activation by C-S-H nucleation seeding","authors":"Diego Vallina , María Dolores Rodríguez-Ruiz , Alejandro Morales-Cantero , Ana Cuesta , Isabel Santacruz , Alessandro Dalla-Libera , Pere Borralleras , Sébastien Dhers , Peter Schwesig , Oliver Mazanec , Miguel A.G. Aranda , Angeles G. De la Torre","doi":"10.1016/j.cemconcomp.2025.106073","DOIUrl":"10.1016/j.cemconcomp.2025.106073","url":null,"abstract":"<div><div>This study explores the feasibility of using calcined bentonitic clays in LC<sup>3</sup>-50 binders. Four commercially available bentonite rocks were thermally activated and milled to a D<sub>v,50</sub> of 12 ± 2 μm. Their pozzolanic activities were assessed using the R<sup>3</sup> method, yielding total heat released values between 190 and 378 J/g-<sub>SCM</sub>, exceeding the minimum requirements for supplementary cementitious materials (SCMs). The incorporation of superplasticisers (SP) in bentonitic LC<sup>3</sup> mortars was optimized, requiring dosages between 0.7 and 1.1 wt% (by the weight of binder) to achieve an initial slump of 200 ± 20 mm, with flow maintained for 1 h in three of them. These results dispel concerns regarding the use of SP in LC<sup>3</sup> containing calcined bentonites.</div><div>Early-age hydration reactions were accelerated using C-S-H nucleation seeding technology, which increased bentonite LC<sup>3</sup> mortar compressive strength by 50 % at one day. The compressive mechanical strengths at 28 days of the seeded mortars were also enhanced by 15 %.</div><div>To elucidate the effects of C-S-H nucleation seeding, LC<sup>3</sup> pastes were analysed, confirming the occurrence of pozzolanic reactions at one day of hydration. The portlandite contents, determined by Rietveld quantitative phase analysis and thermal analysis, were lower than expected based on the alite hydration degree at the analysed times. Furthermore, the strength enhancing admixture systematically increased the formation of AFm-type phases, such as hemicarboaluminate, and refined the pore microstructure at one day of hydration.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106073"},"PeriodicalIF":10.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737250","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

Impact of external loading on the time-dependent evolution of 3D printed concrete with recycled sand in the green state 外载荷对再生砂3D打印混凝土绿态随时间演化的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-29 DOI: 10.1016/j.cemconcomp.2025.106059

Chao Liu , Xin Li , Yiwen Wu , Huawei Liu , Yisheng Meng

{"title":"Impact of external loading on the time-dependent evolution of 3D printed concrete with recycled sand in the green state","authors":"Chao Liu , Xin Li , Yiwen Wu , Huawei Liu , Yisheng Meng","doi":"10.1016/j.cemconcomp.2025.106059","DOIUrl":"10.1016/j.cemconcomp.2025.106059","url":null,"abstract":"<div><div>External loads are critical to the structural stability and construction precision of 3D printed concrete (3DPC) in the green state. However, in-depth research on this issue remains limited. This study prepared 3D printed concrete with recycled sand (3DPCRS) at replacement ratios of 0 %, 50 %, and 100 % and investigated the time-dependent evolution of 3DPCRS structures in the green state under stepwise loading. Using digital image analysis, the displacement and deformation characteristics of 3DPCRS structures were examined. Additionally, static rheological tests and unconfined uniaxial compression tests were conducted to evaluate the rheological properties and green strength of 3DPCRS. The results indicated that as the recycled sand (RS) replacement ratio increases, the plastic zone area of 3DPCRS structures in the green state under loading gradually decreases. Two displacement modes were identified under loading: instantaneous sudden displacement and static creep displacement, both of which decrease with increasing RS replacement ratio. Furthermore, the yield stress and development rate of the green strength of 3DPCRS accelerate as the RS replacement ratio increases. This study elucidates the mechanisms governing the time-dependent evolution of 3DPCRS structures under loading and proposes a bearing capacity calculation model for vertical loading on the basis of structural parameters. These findings provide valuable guidance for the construction and design of 3DPC structures under loading conditions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106059"},"PeriodicalIF":10.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724423","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

Nano-structure and sensitivity of self-sensing geopolymer composites containing nano carbon black 含纳米炭黑自感地聚合物复合材料的纳米结构和灵敏度

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-28 DOI: 10.1016/j.cemconcomp.2025.106072

Dongyu Wang , Zuhua Zhang , Siqi Ding , Chaolie Ning , Cheng Shi , Yuwei Ma , Qiang Ren , Zhengwu Jiang

{"title":"Nano-structure and sensitivity of self-sensing geopolymer composites containing nano carbon black","authors":"Dongyu Wang , Zuhua Zhang , Siqi Ding , Chaolie Ning , Cheng Shi , Yuwei Ma , Qiang Ren , Zhengwu Jiang","doi":"10.1016/j.cemconcomp.2025.106072","DOIUrl":"10.1016/j.cemconcomp.2025.106072","url":null,"abstract":"<div><div>Geopolymer has unique microstructure, high concentration of alkali cations and low carbon footprint features, which is a promising substitute to ordinary Portland cement (OPC) to produce self-sensing cementitious composites. However, the effects of replacing OPC with a geopolymer matrix and incorporating conductive fillers on the self-sensing behavior and consequent mechanisms of self-sensing geopolymer composites (SSGCs) remain unclear. This study investigates the modification effects of nano carbon black (NCB, 0–6.0 wt%) on the mechanical, electrical, and self-sensing properties of SSGCs. To comprehensively elucidate the sensing mechanism, the roles of NCB and multiphases of SSGC matrix, were analyzed through microstructural and chemical characterizations from the geopolymerization process to self-sensing behavior under compression. Experimental results showed that SSGCs containing NCB demonstrated excellent electrical and sensing properties, particularly in detecting initial crack formation and the ultimate failure. The sensing mechanism was primarily governed by the migration of free ions in pore solutions, the establishment of charge balance and the formation of local dipoles under compressive load. SSGCs having low concentration of NCB exhibited poor sensitivity. With NCB content increasing, the rearrangement of NCB particles and the reconstruction of the conductive network contribute to the enhanced sensing properties. SSGCs integrated structural and self-sensing advantages are promising to advance structural health monitoring throughout the life cycle.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106072"},"PeriodicalIF":10.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734198","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-plane and out-of-plane compressive performance of bio-inspired 3D printed strain-hardening cementitious composite porous lattice structures 仿生3打印应变硬化胶凝复合材料晶格结构的面内外压缩性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-27 DOI: 10.1016/j.cemconcomp.2025.106070

Guoqiang Du, Yan Sun, Ye Qian

{"title":"In-plane and out-of-plane compressive performance of bio-inspired 3D printed strain-hardening cementitious composite porous lattice structures","authors":"Guoqiang Du, Yan Sun, Ye Qian","doi":"10.1016/j.cemconcomp.2025.106070","DOIUrl":"10.1016/j.cemconcomp.2025.106070","url":null,"abstract":"<div><div>Porous lattice structures are widely used in energy absorption applications due to their excellent energy absorption characteristics. Strain-hardening cementitious composites (SHCC) are promising materials for 3D printed concrete. Inspired by the slender stems of <em>Elytrigia repens</em>, this study designed and fabricated five different types of 3D printed SHCC porous lattice structures: triangular, rectangular, regular honeycomb, auxetic honeycomb, and circular. Compressive tests were conducted in both the in-plane and out-of-plane directions to evaluate their compressive behavior. Compared to the mold-cast solid specimens, the printed porous lattice specimens exhibited superior energy absorption capacity and ductility. Under in-plane loading, the ductility factor of the printed specimens was 3.03–7.47 times higher than that of the mold-cast specimens; while under out-of-plane loading, the specific energy absorption was 1.41–2.57 times higher. A finite element model (FEM) was developed to simulate the compressive behavior of the 3D printed SHCC porous lattice structures, using the concrete plastic damage model and cohesive elements. Based on the developed FEM, the relative density of the five structures was expanded, ranging from 0.31 to 0.79. A power law function was established based on the relative density to predict the mechanical performance of the bio-inspired 3D printed SHCC porous lattice structures. The coefficient of determination for the prediction model ranged from 0.77 to 0.99, with an average of 0.94, indicating that the model accurately reflects the mechanical performance trends of the structures and exhibits high accuracy and reliability.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106070"},"PeriodicalIF":10.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713408","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

Autogenous healing efficiency of calcium (OPC) and magnesium (MgO) binder-based strain-hardening cementitious composite (SHCC) 钙（OPC）和镁（MgO）粘结剂基应变硬化胶凝复合材料（SHCC）的自愈效率

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-27 DOI: 10.1016/j.cemconcomp.2025.106071

Lei Gu , Dhanendra Kumar , Cise Unluer , Paulo J.M. Monteiro , En-Hua Yang

{"title":"Autogenous healing efficiency of calcium (OPC) and magnesium (MgO) binder-based strain-hardening cementitious composite (SHCC)","authors":"Lei Gu , Dhanendra Kumar , Cise Unluer , Paulo J.M. Monteiro , En-Hua Yang","doi":"10.1016/j.cemconcomp.2025.106071","DOIUrl":"10.1016/j.cemconcomp.2025.106071","url":null,"abstract":"<div><div>This study investigated the effects of hydrated phase composition [tailored using Portland cement (OPC) and reactive magnesia cement (RMC), water-to-binder (w/b) ratio, and curing age] on the autogenous self-healing behavior of strain-hardening cementitious composites (SHCC). The healing efficiency was characterized by stiffness recovery and crack width. The morphology of the cracked sections and chemical characterization of the matrix and healing products were carried out simultaneously to understand the characteristics of healing products and underlying mechanisms. The stiffness recovery reduced with increased curing age for OPC-based SHCCs, but the effect was insignificant in RMC-based SHCCs. The threshold crack width for complete healing was larger for OPC-based SHCCs than RMC-based SHCCs. A low w/b ratio is beneficial for robust self-healing in both OPC and RMC-based SHCCs due to increased unreacted cement content in the matrix. The possibility of early-age crack healing was higher in all the investigated SHCCs. The RMC-based SHCC with a low w/b ratio, maintained its autogenous healing capacity irrespective of the composite age.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106071"},"PeriodicalIF":10.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713415","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

Influence of steel fiber hybridization on the static mechanical performance of ultra-high performance geopolymer concrete (UHPGC) 钢纤维杂化对超高性能地聚合物混凝土静态力学性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-27 DOI: 10.1016/j.cemconcomp.2025.106064

Yiwei Liu , Yanan Ren , Qi Li , Caijun Shi

{"title":"Influence of steel fiber hybridization on the static mechanical performance of ultra-high performance geopolymer concrete (UHPGC)","authors":"Yiwei Liu , Yanan Ren , Qi Li , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106064","DOIUrl":"10.1016/j.cemconcomp.2025.106064","url":null,"abstract":"<div><div>This study investigated the influence of hybrid steel fiber reinforcement on the static mechanical properties of ultra-high performance geopolymer concrete (UHPGC). Three straight steel fibers of varying lengths (6, 8 and 13 mm) were examined. The flowability, compressive strength, and flexural and tensile characteristics of UHPGC with different steel fiber combinations were evaluated using the simplex centroid design method with axial design. The results showed that an inferior flowability was obtained with incorporations of longer steel fibers and the hybridization of three straight steel fibers exhibited a negative influence on the flowability. Hybrid steel fiber reinforcement had varying effects on the strength, deflection/elongation and energy absorption capacities of different mechanical properties of UHPGC. Compared to single steel fiber reinforcements, hybrid steel fiber reinforcements with two different fibers could improve the compressive strength and flexural behavior, while a negative synergy was observed when three fibers were used. Incorporating longer steel fibers enhanced the ultimate tensile strength, and the steel fiber hybridization had a considerable synergy on the tensile behavior of UHPGC. The highest ultimate tensile strain up to 0.27 % was achieved when 1 % long and 1 % medium-long fibers were added. Optimal hybrid steel fiber reinforcement meeting different mechanical performance for UHPGC can be determined using the simplex centroid design method with axial design.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106064"},"PeriodicalIF":10.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713412","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

Fiber distribution in strain-hardening cementitious composites (SHCC): Experimental investigation and its correlation with matrix flowability and tensile strength 应变硬化胶凝复合材料（SHCC）中的纤维分布：实验研究及其与基体流动性和抗拉强度的关系

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-26 DOI: 10.1016/j.cemconcomp.2025.106068

Zhenghao Li , Jiajia Zhou , Christopher K.Y. Leung

{"title":"Fiber distribution in strain-hardening cementitious composites (SHCC): Experimental investigation and its correlation with matrix flowability and tensile strength","authors":"Zhenghao Li , Jiajia Zhou , Christopher K.Y. Leung","doi":"10.1016/j.cemconcomp.2025.106068","DOIUrl":"10.1016/j.cemconcomp.2025.106068","url":null,"abstract":"<div><div>Sectional fiber content variation in strain-hardening cementitious composites (SHCC) governs tensile performance by dictating the bridging capacity of the weakest crack. However, this critical factor has rarely been quantified experimentally. This study systematically characterizes fiber distribution in SHCC with varying matrix flowabilities via sectional analysis. Results show that medium matrix flowability (Marsh cone flow time of around 30 s) results in both uniform fiber dispersion and reduced fiber content variation, thus enhancing tensile performance. Existing Monte Carlo models are found to significantly underestimate the sectional fiber content variations exhibited by test data by over 70 %, highlighting the necessity of this experimental study. Simulations on minimal sectional fiber content based on measured distributions show a strong correlation with experimental median tensile strength (<span><math><mrow><msup><mi>R</mi><mn>2</mn></msup></mrow></math></span> = 0.9538), confirming the tensile behavior depends critically on fiber content variability. This study quantitatively explained the differences in the tensile strength of SHCC with different matrix flowabilities and provided new insights into the relationship between matrix flowability and tensile performance. The measured fiber distributions can facilitate the design, optimization, and modeling of SHCC considering the material processing factors.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106068"},"PeriodicalIF":10.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713328","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

Performance evaluation of mixing carbonated reactive magnesia slurry in Portland cement pastes 碳化活性镁浆在硅酸盐水泥浆中的掺合性能评价

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-26 DOI: 10.1016/j.cemconcomp.2025.106065

Shuang Luo , Minlu Wang , Ba Tung Pham , Nele De Belie , Tung-Chai Ling

{"title":"Performance evaluation of mixing carbonated reactive magnesia slurry in Portland cement pastes","authors":"Shuang Luo , Minlu Wang , Ba Tung Pham , Nele De Belie , Tung-Chai Ling","doi":"10.1016/j.cemconcomp.2025.106065","DOIUrl":"10.1016/j.cemconcomp.2025.106065","url":null,"abstract":"<div><div>This study uses carbonated reactive magnesia (RM) as a partial cement replacement to improve the mechanical properties of blended cement pastes. To achieve more complete and homogeneous carbonation, 30 wt% RM was first mixed at a fixed 1.67 water-RM ratio for 0–90 min (aqueous carbonation). After this, the mixture was mixed with the remaining 70 wt% ordinary Portland cement (OPC) to achieve a final water-binder ratio of 0.5. During the first 10 min of aqueous carbonation, the pH of the RM slurry dropped significantly. After 40 min, needle-like nesquehonite was detected and predominated in the system at 90 min. Mixing the carbonated RM slurries with OPC (RMP cement paste) created more nano-calcite, which covered the nesquehonite surface and served as nucleation sites to accelerate the hydration of RMP cement paste. Consequently, the setting time and fluidity of RMP cement pastes decreased with carbonation time of RM slurries used. Upon one day of hydration, nesquehonite, calcite, and vaterite coexisted in the paste. At 28 days, vaterite gradually transformed into calcite and reacted with aluminum phases to form mono-carboaluminate, densifying the microstructure and boosting the 28-day strength by 194 % compared to the control paste.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106065"},"PeriodicalIF":10.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713410","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

Understanding reactivity of calcined marine clay as a supplementary cementitious material through structural transformation of clay minerals 通过粘土矿物的结构转变了解煅烧海相粘土作为补充胶凝材料的反应性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-26 DOI: 10.1016/j.cemconcomp.2025.106066

Zhijian Chen, Kunlin Luo, Hailong Ye

{"title":"Understanding reactivity of calcined marine clay as a supplementary cementitious material through structural transformation of clay minerals","authors":"Zhijian Chen, Kunlin Luo, Hailong Ye","doi":"10.1016/j.cemconcomp.2025.106066","DOIUrl":"10.1016/j.cemconcomp.2025.106066","url":null,"abstract":"<div><div>Compared to the fairly pure kaolinitic clay, dredged marine clay is a mixture of kaolinite, other 2:1 clay minerals (e.g. illite), and impurities like quartz. Upon thermal activation, the calcined marine clay emerges as a low-grade clay-type supplementary cementitious material (SCM). However, a thorough understanding about the underlying mechanism and key factors governing its reactivity evolution is necessary before its widespread application. In this work, the reactivity, physical properties, and mineralogical evolution of marine clay upon calcination between 650 °C and 900 °C were investigated, with particular emphasis on linking reactivity to the structural transformation of aluminosilicates in the clay. The reactivity arises from dehydroxylation and amorphization of kaolinite and 2:1 clay minerals with increasing proportion of disordered Al (4- and 5-fold coordination). After complete dehydroxylation (>650 °C), the structural disordering of the aluminosilicate continues to enhance with increasing amorphous content and more polymerised Q<sup>4</sup> framework with Al substitution. However, condensed silica networks (Si-O-Si) forms at higher temperature may hamper the reactivity. Additionally, the specific surface area of marine clay decreases significantly above 650 °C, becoming relatively low at high temperature (>750 °C) as a result of structural rearrangement of the clay minerals and interparticle sintering. The highest reactivity is achieved at 750 °C. By exhibiting comparable compressive strength to reference Portland cement mortar at 28 days at 30 % replacement level, the calcined marine clay shows potential as a sustainable SCM alternative in low-carbon concrete production.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106066"},"PeriodicalIF":10.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703252","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