Cement & concrete composites最新文献_第4页

Regulating hydration and microstructure development of reactive MgO cement by citric acids 用柠檬酸调节活性氧化镁水泥的水化和微观结构发展

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-01 DOI: 10.1016/j.cemconcomp.2024.105832

Huanhuan Wang , Shuang Liang , Xiangming Zhou , Pengkun Hou , Xin Cheng

{"title":"Regulating hydration and microstructure development of reactive MgO cement by citric acids","authors":"Huanhuan Wang , Shuang Liang , Xiangming Zhou , Pengkun Hou , Xin Cheng","doi":"10.1016/j.cemconcomp.2024.105832","DOIUrl":"10.1016/j.cemconcomp.2024.105832","url":null,"abstract":"<div><div>Reactive MgO cement (RMC) is a novel binder formed through the hydration and carbonation of MgO, but its low reactivity hinders its wider application. Preliminary research has suggested that citric acids can form compounds with Mg<sup>2+</sup> that regulate these processes, but the mechanism is yet to be understood well. This study investigated the effects of citric acids on the fresh and hardened properties of RMC. Results showed that the shear yield stress and plastic viscosity of the RMC pastes decreased with the addition of citric acids. Under standard curing, 4 <em>wt</em>% and 8 <em>wt</em>% citric acids increased the compressive strength of RMC by ∼100 % at 14 days. The adsorption of citrate on MgO inhibited the formation of brucite, forming an amorphous network-like microstructure crystallised after 14 days. Under CO<sub>2</sub> curing, the compressive strength of RMC with 8 <em>wt</em>% citric acids increased by 12 % at 14 days, which could be ascribed to the porous microstructure formed that promotes the uptake of CO<sub>2</sub> and the densification of the microstructure.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105832"},"PeriodicalIF":10.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142562255","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

Stabilization of metastable calcium carbonate polymorphs on the surface of recycled cement paste particles: A two-step carbonation approach without chemical additives 再生水泥浆颗粒表面可迁移碳酸钙多晶体的稳定化：不使用化学添加剂的两步碳化法

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-01 DOI: 10.1016/j.cemconcomp.2024.105829

Qingsong Zhou , Amr Meawad , Wei Wang , Takafumi Noguchi

{"title":"Stabilization of metastable calcium carbonate polymorphs on the surface of recycled cement paste particles: A two-step carbonation approach without chemical additives","authors":"Qingsong Zhou , Amr Meawad , Wei Wang , Takafumi Noguchi","doi":"10.1016/j.cemconcomp.2024.105829","DOIUrl":"10.1016/j.cemconcomp.2024.105829","url":null,"abstract":"<div><div>In this study, a two-step carbonation method is developed to control the formation of calcium carbonate (<em>Cc</em>) polymorphs on the surface of recycled hardened cement paste (RHCP) without the use of chemical additives. In the first step, RHCP undergoes semi-dry carbonation under controlled humidity conditions, followed by wet carbonation at various temperatures in the second step. The results show that vaterite and aragonite are stabilized during the wet carbonation process, forming primarily on the surface of RHCP particles. The stabilization of the metastable <em>Cc</em> phases is driven by the synergistic effect of existing <em>Cc</em> seeds in the RHCP and the reaction temperature. A temperature range of 9–48 °C promotes the formation of vaterite, while higher temperatures (60–90 °C) lead to its dissolution. The calcite seeds present in RHCP do not enhance the formation of vaterite and aragonite during wet carbonation. This method offers a potential practical approach for valorizing concrete waste while capturing CO₂ from the atmosphere.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105829"},"PeriodicalIF":10.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142562167","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

Degradation mechanism of seawater-mixed cementitious material subjecting to sulphate attack 海水混合胶凝材料受硫酸盐侵蚀的降解机理

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-01 DOI: 10.1016/j.cemconcomp.2024.105830

Yamei Cai , Xiaohong Zhu , Keke Sun , Kesheng Yin , Dongxing Xuan , Chi Sun Poon

{"title":"Degradation mechanism of seawater-mixed cementitious material subjecting to sulphate attack","authors":"Yamei Cai , Xiaohong Zhu , Keke Sun , Kesheng Yin , Dongxing Xuan , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2024.105830","DOIUrl":"10.1016/j.cemconcomp.2024.105830","url":null,"abstract":"<div><div>This study compared the sulphate resistance of deionized water (DI)- and seawater (SW)-mixed cementitious materials based mainly on microstructural observations. The results show that, after a 450-day exposure to 50 g/L Na<sub>2</sub>SO<sub>4</sub> solution, there was an increase in the mean chain length and polymerization degree of the remaining silicate chains in C-S-H gel for both DI- and SW-mixed pastes at a depth of 0–2 mm from the exposed surface. Notably, the Ca leaching of C-S-H gel in the SW-mixed paste at depths larger than 0.3 mm was slightly less than that in the DI-mixed one, despite the Ca leaching in both samples was comparable at a depth of 0.1 mm. For the aluminate phase, the mass loss and length change of the SW-mixed C<sub>3</sub>A mortar were lower than that of the DI-mixed C<sub>3</sub>A mortar, after immersing in 50 g/L Na<sub>2</sub>SO<sub>4</sub> solution at different times. It seemed that more expansive product can be accommodated in the SW-mixed C<sub>3</sub>A matrix. Consequently, fewer cracks deposited by gypsum were observed in SW-mixed paste than in DI-mixed paste. The above were responsible for relatively less compressive strength loss of the SW-mixed mortars suffering from sulphate attack for 450 d.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105830"},"PeriodicalIF":10.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142562166","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

Triaxial compressive behavior of 3D printed PE fiber-reinforced ultra-high performance concrete 3D 打印聚乙烯纤维增强超高性能混凝土的三轴抗压行为

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-30 DOI: 10.1016/j.cemconcomp.2024.105816

Jun-Jie Zeng , Xianwen Hu , Hou-Qi Sun , Yue Liu , Wei-Jian Chen , Yan Zhuge

{"title":"Triaxial compressive behavior of 3D printed PE fiber-reinforced ultra-high performance concrete","authors":"Jun-Jie Zeng , Xianwen Hu , Hou-Qi Sun , Yue Liu , Wei-Jian Chen , Yan Zhuge","doi":"10.1016/j.cemconcomp.2024.105816","DOIUrl":"10.1016/j.cemconcomp.2024.105816","url":null,"abstract":"<div><div>The layered deposition process of 3D concrete printing can lead to reduced mechanical properties at the interfaces between filaments. To address this limitation, external confinement devices, such as fiber-reinforced polymer (FRP) wrapping, have been proposed to enhance the strength of 3D-printed concrete concrete. Achieving this requires a solid understanding of the triaxial mechanical performance of 3D-printed concrete. This study presents an experimental investigation of the triaxial compressive behavior of 3D-printed PE fiber-reinforced ultra-high performance concrete (3DP-PEUHPC). A total of 16 pairs of concrete cubes were prepared, including mold-cast and 3D-printed specimens, and subjected to uniaxial and triaxial compression tests. The results revealed that the 3D-printed specimens exhibited either column-type or diagonal shear failures under triaxial compression. Weak bonding was observed at both filament-fusion and layer-fusion interfaces, with these weaker bonding interfaces, particularly when aligned parallel to the axial load, showing susceptibility to stress concentration and crack initiation. This led to a reduction in load-bearing capacity of the 3D-printed specimens compared to the mold-cast specimens. Importantly, as confining stresses increase, the difference in compressive strength between 3D-printed and mold-cast specimens decreases, highlighting the effectiveness of confinement in mitigating the directional weaknesses inherent in 3D-printed concrete. This paper also presents a modified model for predicting the axial stress-strain relationship of 3DP-PEUHPC under confinement, providing insights into the mechanism of FRP confinement on the compressive strength of 3D-printed concrete structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105816"},"PeriodicalIF":10.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142541710","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

Mitigation of plastic shrinkage cracking with natural fibers - kenaf, abaca, coir, jute and sisal 用天然纤维（洋麻、刺槐树、椰子纤维、黄麻和剑麻）缓解塑料收缩开裂问题

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-30 DOI: 10.1016/j.cemconcomp.2024.105827

Pietro Lura , Nikolajs Toropovs , Janis Justs , Mahdieh Shakoorioskooie , Beat Münch , Michele Griffa

{"title":"Mitigation of plastic shrinkage cracking with natural fibers - kenaf, abaca, coir, jute and sisal","authors":"Pietro Lura , Nikolajs Toropovs , Janis Justs , Mahdieh Shakoorioskooie , Beat Münch , Michele Griffa","doi":"10.1016/j.cemconcomp.2024.105827","DOIUrl":"10.1016/j.cemconcomp.2024.105827","url":null,"abstract":"<div><div>In this study, a number of different fibers - namely kenaf, jute, abaca, coir and sisal - were investigated as natural alternatives to polypropylene (PP) fibers for reducing plastic shrinkage cracking. The risk of plastic shrinkage cracking of mortars with water-to-cement ratio 0.5 containing either 0.6 or 0.9 kg/m<sup>3</sup> of natural fibers was assessed according to the ASTM <span><span>C1579-21</span><svg><path></path></svg></span> standard and compared with plain mortars and mortars with PP fibers. The water absorption of the natural fibers was low enough that (at the employed dosages) the effect on the workability and on other fresh properties was small. The natural fibers also had no measurable influence on cement hydration in the examined mortars, as revealed by isothermal calorimetry.</div><div>The best performance in reducing the width of plastic shrinkage cracks was shown by kenaf and jute fibers at the dosage of 0.6 kg/m<sup>3</sup>, which outperformed even a higher dosage of PP fibers (0.9 kg/m<sup>3</sup>). Kenaf fibers in pellets, which are advantageous for dosing and mixing, performed similarly as loose fibers. The distribution of both loose and pelletized kenaf fibers in the mortars was studied by X-ray tomography, showing no substantial difference between the two ways of delivering the fibers.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105827"},"PeriodicalIF":10.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142541707","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

Effects of specimen thickness and fiber length on tensile and cracking behavior of UHPFRC: Uniaxial tensile test and micromechanical modeling 试样厚度和纤维长度对超高分子量纤维增强混凝土结构（UHPFRC）拉伸和开裂行为的影响：单轴拉伸试验和微机械建模

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-30 DOI: 10.1016/j.cemconcomp.2024.105828

Zhenyu Tao , Minghong Qiu , Kay Wille , Yanping Zhu , Rensheng Pan , Zhao Li , Xudong Shao

{"title":"Effects of specimen thickness and fiber length on tensile and cracking behavior of UHPFRC: Uniaxial tensile test and micromechanical modeling","authors":"Zhenyu Tao , Minghong Qiu , Kay Wille , Yanping Zhu , Rensheng Pan , Zhao Li , Xudong Shao","doi":"10.1016/j.cemconcomp.2024.105828","DOIUrl":"10.1016/j.cemconcomp.2024.105828","url":null,"abstract":"<div><div>This study aims to investigate the effects of specimen thickness and fiber length on the tensile and cracking behaviors of ultra-high-performance fiber-reinforced concrete (UHPFRC). To this end, a uniaxial tensile test was conducted with three specimen thicknesses (30, 50, and 100 mm) and two fiber lengths (13 and 20 mm), and the fiber orientation, dispersion and specimen void were quantitatively evaluated based on image recognition. The test results indicated that fiber orientation was improved with the decreased specimen thickness and increased fiber length. Meanwhile, the initial cracking and peak stress, capacity to limit cracking were enhanced with the decreased specimen thickness. A modified prediction model considering the wall effect, flattening and squeezing effect was developed to predict the probability density function <em>p</em>(<em>θ</em>) of fiber orientation angle. Additionally, the uniformity factor <em>μ</em><sub>2</sub> was introduced to predict crack number, and the relationship between the <em>μ</em><sub>2</sub> and parameter <em>ψ</em> = (<em>V</em><sub><em>f</em></sub> × <em>l</em><sub><em>f</em></sub>/<em>d</em><sub><em>f</em></sub>)/<em>t</em> was determined. Furthermore, a model was developed to convert the main crack width into uniaxial tensile strain. All models and relationships were validated using test data. A micromechanical model that considered the predicted <em>p</em>(<em>θ</em>) and conversion model was established to predict the uniaxial tensile response of UHPFRC, which was also successfully validated using test data.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105828"},"PeriodicalIF":10.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142541709","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

Advanced moisture control in porous aggregates for improved lightweight high-performance concrete 在多孔骨料中采用先进的水分控制技术，改善轻质高性能混凝土的性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-28 DOI: 10.1016/j.cemconcomp.2024.105826

Ying Wei , Ziwei Chen , Marcus Yio , Christopher Cheeseman , Hailong Wang , Chi Sun Poon

{"title":"Advanced moisture control in porous aggregates for improved lightweight high-performance concrete","authors":"Ying Wei , Ziwei Chen , Marcus Yio , Christopher Cheeseman , Hailong Wang , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2024.105826","DOIUrl":"10.1016/j.cemconcomp.2024.105826","url":null,"abstract":"<div><div>The porous lightweight aggregates in concrete experience a process of water absorption and desorption. This study aims to improve the performance of water-sensitive low water/binder (w/b) systems by effectively utilizing these water regulations. The effects of expanded shale (ES) substitutions and saturation levels (dry, half saturation, and saturation) on the fresh and hardened properties of mixtures with a w/b of 0.18 were investigated. The results indicated that, during the fresh stage, water absorption reduced workability and shortened the setting time. In the hardening stage, the released water improved hydration, increased internal relative humidity, and caused volumetric expansion, which reduced autogenous shrinkage. A comprehensive evaluation revealed that the optimal condition for ES was half-saturation with 4.0 wt% pre-absorbed water. This condition achieved the best internal curing effect, improved workability, and optimal structural efficiency (strength/density). This study provides practical insights for the effective integration of porous aggregates in the mixture design and engineering applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105826"},"PeriodicalIF":10.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519673","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

Deep learning methods for phase segmentation in backscattered electron images of cement paste and SCM-blended systems 用于水泥浆和单体混合系统背散射电子图像相位分割的深度学习方法

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-26 DOI: 10.1016/j.cemconcomp.2024.105810

Yan Yu, Guoqing Geng

{"title":"Deep learning methods for phase segmentation in backscattered electron images of cement paste and SCM-blended systems","authors":"Yan Yu, Guoqing Geng","doi":"10.1016/j.cemconcomp.2024.105810","DOIUrl":"10.1016/j.cemconcomp.2024.105810","url":null,"abstract":"<div><div>Quantitative microstructure analysis of supplementary cementitious material (SCM) - blended paste through backscattered electron (BSE) imaging has long been intractable owing to the sophisticated micro phase distribution and overlapped greyscale histogram. This study explores the use of Convolutional Neural Network (CNN) based supervised semantic segmentation methods for quantifying phase assemblage in BSE images of blank cement paste and SCM-blended cement pastes. Four types of SCMs, namely limestone, slag, quartz and metakaolin, were separately blended with WPC and OPC paste for analysis. U-Net architecture with and without ResNet backbones were trained to perform pixel-level image segmentation of anhydrous cement and SCM particles. The results indicate that deep learning models can robustly segment anhydrous cement particles from BSE images and achieve same level of precision as QXRD. For limestone, quartz and slag, deep learning models show strong potential for semi-quantitative segmentation. While metakaolin cannot be reliably segmented based solely on graphic information.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105810"},"PeriodicalIF":10.8,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519263","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 CO2 mixing on the rheological and electrochemical properties of fresh mortar at the early age 二氧化碳搅拌对新拌砂浆早期流变学和电化学性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-26 DOI: 10.1016/j.cemconcomp.2024.105817

Kaiyin Zhao , Hengrui Liu , Lucen Hao , Shuangshuang Liu , Shipeng Zhang , Chi Sun Poon

{"title":"Effect of CO2 mixing on the rheological and electrochemical properties of fresh mortar at the early age","authors":"Kaiyin Zhao , Hengrui Liu , Lucen Hao , Shuangshuang Liu , Shipeng Zhang , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2024.105817","DOIUrl":"10.1016/j.cemconcomp.2024.105817","url":null,"abstract":"<div><div>The study aimed to elucidate the mechanism behind rheological modification due to CO<sub>2</sub> mixing at the mixing and post-mixing stages from an electrochemical perspective. The results indicated that CO<sub>2</sub> mixing reduced the flowability while increasing penetration resistance and static yield stress. The electrostatic attraction between particles with opposite surface charges and the bridging effect of calcium carbonate constitute the primary factors for influencing the rheological properties of mortar at an early age. The altered surface charge of carbonized cement particles, primarily resulting from CO<sub>2</sub> injection lowering the pH and ion concentration, reversed the zeta potential of particles from the traditionally negative charge (−3.59 mV) to a positive value (+13.3 mV). Furthermore, CO<sub>2</sub> mixing further enhanced the dissolution of cement particles and accelerated the hydration process, thereby increasing the rate of structural build-up. CO<sub>2</sub> mixing was demonstrated to be a potential rheological modifier for 3D-printed concrete applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105817"},"PeriodicalIF":10.8,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519674","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

-Mixed hydrogen and biofuels cement clinker: Characterisation, microstructure, and performance 净零燃料（混合氢气和生物燃料）水泥熟料：特性、微观结构和性能。

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-10-25 DOI: 10.1016/j.cemconcomp.2024.105814

Samuel Adu-Amankwah , Ben Douglas , Leslie Arkless , Nina Cardinal , Maciej Zajac

{"title":"-Mixed hydrogen and biofuels cement clinker: Characterisation, microstructure, and performance","authors":"Samuel Adu-Amankwah , Ben Douglas , Leslie Arkless , Nina Cardinal , Maciej Zajac","doi":"10.1016/j.cemconcomp.2024.105814","DOIUrl":"10.1016/j.cemconcomp.2024.105814","url":null,"abstract":"<div><div>Over 35 % of the CO<sub>2</sub> associated with cement production comes from operational energy. The cement industry needs alternative fuels to meet its net zero emissions target. This study investigated the influence of hydrogen mixed with biofuels, herein designated net zero fuel as an alternative to coal, on the clinker quality and performance of cement produced in an industrial cement plant. Scanning electron microscopy, X-ray diffraction and nuclear magnetic resonance were coupled to study the clinker mineralogy and polymorphs. Hydration and microstructure development in plain and slag blended cements based on the clinker were compared to commercial cement equivalent. The results revealed a lower alite/belite ratio, but a significant proportion of the belite was of the α′<sub>H</sub>-C<sub>2</sub>S polymorph. These reacted faster and compensated for the alite/belite ratio. Gel and micro-capillary pores were densified, which reduced total porosity and attained comparable strength to the reference plain and blended cement. This study demonstrates that the investigated net zero fuel-produced clinker meets compositional and strength requirements for plain and blended cement, providing a feasible pathway for the cement industry to lower its operational carbon significantly.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105814"},"PeriodicalIF":10.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142489213","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