Cement & concrete composites最新文献_第8页

Damage characterization of carbonated cement pastes with a gradient structure 梯度结构碳化水泥浆体损伤特性研究

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-18 DOI: 10.1016/j.cemconcomp.2024.105901

Qinglong Qin, Boyang Su, Zihan Ma, Kai Cui, Weiwei Chen, Peiliang Shen, Qi Zhao, Chi Sun Poon

{"title":"Damage characterization of carbonated cement pastes with a gradient structure","authors":"Qinglong Qin, Boyang Su, Zihan Ma, Kai Cui, Weiwei Chen, Peiliang Shen, Qi Zhao, Chi Sun Poon","doi":"10.1016/j.cemconcomp.2024.105901","DOIUrl":"10.1016/j.cemconcomp.2024.105901","url":null,"abstract":"<div><div>CO<sub>2</sub> curing cementitious materials shows promise as a method to both reduce and sequestrate CO<sub>2</sub>, nonetheless, it results in the formation of a gradient structure in them. In this study, the mechanical behavior, damage mode and inhomogeneity of carbonated cement pastes are investigated, aiming to establish the intrinsic link between their damage and inhomogeneity. The results indicated that carbonated cement pastes exhibit pronounced stress instability and brittle damage at low strengths, closely linked to their inhomogeneity. Moreover, carbonated cement paste is an inhomogeneous mass with a gradient structure. It displays a three-layer structure comprising an outermost, intermediate, and innermost layer. The outermost layer primarily comprises calcite, with minor amounts of aragonite and silica gel. Furthermore, its porosity, average micro-hardness, and elastic modulus are 26.81 %, 58.62 HV, and 84.66 GPa, respectively. The intermediate layer consists mainly of calcite, aragonite, calcium hydroxide, C-S-H gel, and silica gel, with porosity, average micro-hardness, and elastic modulus of 28.46 %, 37.21 HV, and 53.74 GPa, respectively. The innermost layer is composed of C-S-H gel, calcium hydroxide, calcite, aragonite, calcium hydroxide, and silica gel, with porosity, average micro-hardness, and elastic modulus values of 29.29 %, 25.73 HV, and 58.87 GPa, respectively. The damage in cement pastes with a low degree of carbonation primarily arises from mixed shear-tensile cracks, whereas in cement pastes with a high degree of carbonation, tensile cracks are the predominant cause of damage.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105901"},"PeriodicalIF":10.8,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857858","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

Monitoring of drying and imbibition of concrete using embedded resistivity sensors for the estimation of permeability 用嵌入式电阻率传感器监测混凝土的干燥和渗吸，以估计其渗透性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-18 DOI: 10.1016/j.cemconcomp.2024.105900

Marie-Ange Eid , Nicolas Reuge , Géraldine Villain , Stéphanie Bonnet , Sérgio Palma Lopes

{"title":"Monitoring of drying and imbibition of concrete using embedded resistivity sensors for the estimation of permeability","authors":"Marie-Ange Eid , Nicolas Reuge , Géraldine Villain , Stéphanie Bonnet , Sérgio Palma Lopes","doi":"10.1016/j.cemconcomp.2024.105900","DOIUrl":"10.1016/j.cemconcomp.2024.105900","url":null,"abstract":"<div><div>Assessing the permeability of concrete is crucial as it governs the transport of aggressive agents, such as chlorides and carbon dioxide, which are key factors in the degradation mechanisms. Moreover, concrete's permeability constitutes an essential input parameter for durability models. Concrete's permeability can be measured directly (by experimental methods) or indirectly by fitting a transport model to saturation degree profiles. In this paper, we introduce a novel indirect method for estimating the permeability by monitoring the saturation degree profiles with embedded resistivity sensors. These embedded resistivity sensors are used for the evaluation of the saturation degree profiles over time during two experiments: drying and imbibition with tap water. Firstly, measured resistivity profiles are converted to saturation degree profiles, using a calibration curve established on concrete cores of the same formulation. Concrete's permeability is then estimated by fitting a hydric transport model to the experimental saturation degree profiles. Permeability values estimated using the embedded sensor are compared to those obtained by two reference methods: assessing the mass loss of a non-monitored specimen subjected to drying and saturation degree profiles obtained by gammadensimetry measurements. The permeability values obtained with the monitoring method are consistent for drying and imbibition experiments and fall within the range of values found in the literature. This is very promising for the continuous monitoring of concrete by embedded resistivity sensors.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105900"},"PeriodicalIF":10.8,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841566","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

Mechanical performance of extruded functionally graded fiber-reinforced mortar with targeted fiber injection 定向纤维注入挤压功能梯度纤维增强砂浆的力学性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-17 DOI: 10.1016/j.cemconcomp.2024.105896

Rashed Alarrak , Alexander S. Brand

{"title":"Mechanical performance of extruded functionally graded fiber-reinforced mortar with targeted fiber injection","authors":"Rashed Alarrak , Alexander S. Brand","doi":"10.1016/j.cemconcomp.2024.105896","DOIUrl":"10.1016/j.cemconcomp.2024.105896","url":null,"abstract":"<div><div>This research investigated the mechanical performance of Functionally Graded Fiber-Reinforced Concrete (FG-FRC) produced <em>via</em> extrusion with a targeted fiber injection. Flexural toughness was assessed using a modified ASTM C1609, and fracture properties were analyzed through implementation of the two-parameter fracture model. The study introduced an innovative targeted fiber injection technique using a conveyor system, tailored for the integration of high-stiffness steel fibers into the mortar prior to extrusion. This method permits the use of fibers in more extrusion systems, since the fibers cannot jam in the pump. The research utilized digital image correlation to observe the full displacement field, allowing for an in-depth examination of crack propagation and strain localization. Additionally, X-ray computed tomography was employed to analyze fiber dosage and distribution within the FG-FRC layers. Results indicated that the targeted fiber injection method facilitated effective fiber distribution within FG-FRC layers, leading to enhanced mechanical performance through fiber dosage's optimization.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105896"},"PeriodicalIF":10.8,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841569","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

Water stability improvement and mechanism of magnesium phosphate cement modified by colloidal nano silica 胶体纳米二氧化硅改性磷酸镁水泥的水稳定性改善及其机理

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-16 DOI: 10.1016/j.cemconcomp.2024.105898

Xingyu Gan , Chao Li , Haiming Zhang , Yali Li , Laibo Li , Lingchao Lu

引用次数: 0

The carbon mineralization behavior of copper slag and its impact on pozzolanic reactivity 铜渣中的碳矿化行为及其对泡沫砂浆反应性的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-16 DOI: 10.1016/j.cemconcomp.2024.105899

Yingbin Wang , Xinhao Li , Wenjuan Miao , Ying Su , Xingyang He , Bohumir Strnadel

{"title":"The carbon mineralization behavior of copper slag and its impact on pozzolanic reactivity","authors":"Yingbin Wang , Xinhao Li , Wenjuan Miao , Ying Su , Xingyang He , Bohumir Strnadel","doi":"10.1016/j.cemconcomp.2024.105899","DOIUrl":"10.1016/j.cemconcomp.2024.105899","url":null,"abstract":"<div><div>The massive discharge of copper slag (CS) has led to serious environmental problems. Carbon mineralization, as a treatment method of solid waste, not only achieves carbon sequestration, but also enhances the pozzolanic activity. In this work, a novel exfoliation aqueous carbonation method combining aqueous carbon mineralization and wet grinding was proposed to evaluate the carbon mineralization behavior of CS at mild temperature and pressure. The results indicated that exfoliation aqueous carbonation exhibited higher mineralization degree than that of classical CO<sub>2</sub> bubbling carbonation. The carbonation products of CS were mainly composed of amorphous carbonate and silica. Elevated carbonation temperature could promote the dissolution of fayalite in CS to enhance the carbon mineralization degree. Carbon mineralization treatment could improve the pozzolanic reactivity of CS and the 28 d strength activity index could reach up to 106.3 %. The outcomes could help provide new technology to facilitate the resource utilization of CS.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105899"},"PeriodicalIF":10.8,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832277","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

Interfacial bond properties between 3D printed engineered cementitious composite (ECC) and post-cast concrete 3D 打印工程水泥基复合材料 (ECC) 与后浇混凝土之间的界面粘结特性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-16 DOI: 10.1016/j.cemconcomp.2024.105897

Meiyan Bai , Jianzhuang Xiao , Tao Ding , Kequan Yu

{"title":"Interfacial bond properties between 3D printed engineered cementitious composite (ECC) and post-cast concrete","authors":"Meiyan Bai , Jianzhuang Xiao , Tao Ding , Kequan Yu","doi":"10.1016/j.cemconcomp.2024.105897","DOIUrl":"10.1016/j.cemconcomp.2024.105897","url":null,"abstract":"<div><div>Buildings can be rapidly constructed using 3D printed concrete technology without formwork, garnering increasing attention within the construction industry. The effects of different printing parameters on the splitting tensile strength, shear strength, pore structure, and micromorphology of the interface between 3D printed ECC and post-cast concrete were investigated, including single-layer printing height, fiber content, and recycled sand replacement ratio. The results indicated that as the fiber content and single-layer printing height increased, the interfacial bond strength was initially enhanced while subsequently decreased, with optimal bond strength achieved at a 15 mm single-layer printing height. Moderate fiber content and single-layer printing height were beneficial for interfacial bond strength. Meanwhile, the interfacial bond strength was reduced due to the evolution of interfacial pore structure after the incorporation of recycled sand. The splitting tensile strength and shear strength of the interface between 3D printed ECC and post-cast concrete decreased by 36.1 % and 35.8 %, respectively, when the replacement ratio of recycled sand in ECC was 100 %. Additionally, models for the interfacial shear strength between 3D printed ECC and post-cast concrete were proposed.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105897"},"PeriodicalIF":10.8,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832346","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

Nanocarbon black based ultra-high-performance seawater sea-sand concrete (UHPSSC) with self-strain sensing capability 具有自应变传感能力的纳米炭黑基高性能海水海砂混凝土（UHPSSC）

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-15 DOI: 10.1016/j.cemconcomp.2024.105895

Abasal Hussain , Tao Yu , Fangxin Zou

{"title":"Nanocarbon black based ultra-high-performance seawater sea-sand concrete (UHPSSC) with self-strain sensing capability","authors":"Abasal Hussain , Tao Yu , Fangxin Zou","doi":"10.1016/j.cemconcomp.2024.105895","DOIUrl":"10.1016/j.cemconcomp.2024.105895","url":null,"abstract":"<div><div>The use of seawater sea-sand concrete in marine infrastructure not only offers significant sustainability benefits by minimizing the energy consumption and carbon emissions associated with transportation activities, but also helps mitigate the environmental impact caused by excessive sand mining in riverbeds. The study presented in this paper aims to contribute to this growing area of research by introducing self-strain sensing capability to ultra-high-performance seawater sea-sand concrete (UHPSSC) through the incorporation of cost-effective nanocarbon black (nCB) as a functional filler. Mix designs with different nCB contents were formulated and tested for compressive strength, microstructure and piezoresistive behaviour under different curing conditions. The study concludes that, although the addition of nCB generally decreases the workability and compressive strength of UHPSSC, nCB-UHPSSC with reasonably good properties (i.e., slump spread >160 mm, compressive strength >140 MPa) can be successfully achieved, and its compressive strength can be further increased by one-day dry curing at 105 °C ± 1 °C after 28-day water immersion. The study also shows that the developed nCB-UHPSSC possesses stable and repeatable piezoresistive response with a high gauge factor up to over 160. With its outstanding mechanical and piezoresistive properties, the newly developed nCB-UHPSSC is an economically viable and environmentally friendly option for the construction and monitoring of marine and coastal structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105895"},"PeriodicalIF":10.8,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825247","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 mechanisms of porous aggregate morphology, maximum size and optimized gradation on ultra-high performance concrete with ferrochrome slag 多孔骨料形态、最大粒径及优化级配对铬铁渣超高性能混凝土的影响机理

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-13 DOI: 10.1016/j.cemconcomp.2024.105890

Yuanyuan Zhu , Zhidan Rong , Qing Jiang , Jinyan Shi

{"title":"Influence mechanisms of porous aggregate morphology, maximum size and optimized gradation on ultra-high performance concrete with ferrochrome slag","authors":"Yuanyuan Zhu , Zhidan Rong , Qing Jiang , Jinyan Shi","doi":"10.1016/j.cemconcomp.2024.105890","DOIUrl":"10.1016/j.cemconcomp.2024.105890","url":null,"abstract":"<div><div>Ferrochrome slag (FCS) is one of the main by-products generated from the smelting of ferrochrome alloy. Its utilization as aggregate can reduce the mining of natural aggregate and cost of ultra-high performance concrete (UHPC). The morphology of aggregate, maximum size (D<sub>max</sub>) and particle gradation are key factors that affect the properties of concrete. Herein, the morphology of FCS compared to river sand was quantitatively characterized. Aggregate gradation was optimized according to the MAA model. Influence mechanisms of aggregate morphology, D<sub>max</sub>, and optimized gradation on the properties of UHPC were clarified. The results indicated that large-size FCS above 2.36 mm had higher circularity and roughness, which was beneficial for enhancing the interface bonding and restraining shrinkage. Grading optimization improved the mechanical properties of UHPC (up to 14.1 % at 7 days), interface hardness by 8.6 % and reduced the autogenous shrinkage by 6.0 %. This shrinkage was further reduced by 12.0 % at larger sand-binder ratio of 1.4 due to the enhanced restraint capacity of compactly stacked aggregates. Plastic viscosity of fresh mixture increased with the decrease of D<sub>max</sub>, which resulted in a poor workability. Moreover, small-size FCS below 1.18 mm had less roughness and more needle-like particles, which was detrimental to the mechanical properties. The finer particles in FCS also accelerated the hydration process and led to a larger autogenous shrinkage. Thereby, it is not appropriate to adopt more small-sized porous aggregates in UHPC manufacturing. This study provides a theoretical basis for the mixing design and property improvement of UHPC with porous aggregate.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105890"},"PeriodicalIF":10.8,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816373","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 and hydration mechanisms of ultrafine iron ore tailings enhanced supersulfated cement with high phosphogypsum content 超细铁矿尾矿增强高磷石膏超硫酸盐水泥性能及水化机理

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-13 DOI: 10.1016/j.cemconcomp.2024.105891

Mingzhe Zhang , Bing Chen , Weisheng Zhu

引用次数: 0

Insights into nano-silica deposition for carbon textile/cement composite interfacial bond: Quantification of spatial features 纳米二氧化硅沉积对碳纺织/水泥复合材料界面结合的影响：空间特征的量化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-12-12 DOI: 10.1016/j.cemconcomp.2024.105892

Hyun-Soo Youm, Sung-Gul Hong

{"title":"Insights into nano-silica deposition for carbon textile/cement composite interfacial bond: Quantification of spatial features","authors":"Hyun-Soo Youm, Sung-Gul Hong","doi":"10.1016/j.cemconcomp.2024.105892","DOIUrl":"10.1016/j.cemconcomp.2024.105892","url":null,"abstract":"<div><div>The bond-enhancing mechanisms of nano-silica (NS) deposition, described solely by a pozzolanic reaction, have often overlooked its underlying physicochemical nature. We propose a novel framework to quantify spatial disorder in NS deposition and to analyze its impact on the interfacial bond properties of carbon textiles in cement composite. The framework leverages domain knowledge (the morphological characteristics and topochemical hydration mechanisms of cement and NS particles) to estimate the degree of cohesive interconnection between the primary and secondary calcium silicate hydrate (C–S–H) phases precipitated in the textile/matrix interfacial transition zone (ITZ). Utilizing image analysis and rigorous statistical approaches, this framework quantifies latent spatial features derived from the size, polydispersity, and spatial heterogeneity of deposited NS particles. Results confirm that the textile/matrix interfacial bond is a macroscopic property governed not merely by the quantity of NS deposition but also by its topographical complexity, with scale dependence linked to the cement particle size distribution. Strong linear relationships in the inter-scale correlations (R<sup>2</sup> > 0.90 on average) demonstrate the consistency of our framework, significantly outperforming other quantitative methods.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105892"},"PeriodicalIF":10.8,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816375","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