Cement and Concrete Research最新文献_第8页

Understanding hydration reactions, mechanical properties, thermal expansion, and organic interfacial interactions of calcium sulfate hydrates from the atomic scale 从原子尺度上理解水化反应、机械性能、热膨胀和有机界面相互作用的硫酸钙水合物

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-08 DOI: 10.1016/j.cemconres.2024.107740

Ratan K. Mishra , Samir Darouich , Pieter J. in 't Veld , Robert J. Flatt , Hendrik Heinz

{"title":"Understanding hydration reactions, mechanical properties, thermal expansion, and organic interfacial interactions of calcium sulfate hydrates from the atomic scale","authors":"Ratan K. Mishra , Samir Darouich , Pieter J. in 't Veld , Robert J. Flatt , Hendrik Heinz","doi":"10.1016/j.cemconres.2024.107740","DOIUrl":"10.1016/j.cemconres.2024.107740","url":null,"abstract":"<div><div>Calcium sulfates such as anhydrite, hemihydrate, and gypsum are used extensively in building materials, wall board, and biomaterials. The correlation between nanoscale structure and macroscopic properties, however, remains incompletely understood. We employed molecular dynamics simulations with the Interface Force Field (IFF) to examine sensitive hydration reactions, anisotropic thermal and mechanical properties, as well as (hkl) specific adsorption of organic modifiers. Computed thermal transitions between calcium sulfate phases, directional coefficients of thermal expansion, and directional mechanical properties agree exceptionally well with partially known experimental measurements, provide missing data and mechanistic understanding at the atomic scale. Polymeric naphthalene sulfonate-formaldehyde condensates exhibit strong, selective adsorption to the hemihydrate (001) surface. The polymer conformations and facet-specific binding affinities explain the delayed hydration of calcium sulfate hemihydrate to gypsum. The simulation methods can be applied to predict crystal growth and properties of sulfate-containing multiphase materials from atoms to the micrometer scale.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107740"},"PeriodicalIF":10.9,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789811","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

Reaction kinetics of calcined smectite in a clinker-free model and a synthetic cement system in comparison with selected calcined phyllosilicates 煅烧蒙脱石在无熟料模型和合成水泥体系中的反应动力学与煅烧层状硅酸盐的比较

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-08 DOI: 10.1016/j.cemconres.2024.107766

Sebastian Scherb , Matthias Maier , Köberl Mathias , Nancy Beuntner , Karl-Christian Thienel

{"title":"Reaction kinetics of calcined smectite in a clinker-free model and a synthetic cement system in comparison with selected calcined phyllosilicates","authors":"Sebastian Scherb , Matthias Maier , Köberl Mathias , Nancy Beuntner , Karl-Christian Thienel","doi":"10.1016/j.cemconres.2024.107766","DOIUrl":"10.1016/j.cemconres.2024.107766","url":null,"abstract":"<div><div>The investigations of clinker-free model and synthetic cement systems reveal deeper insight into the behavior of metasmectite during early hydration. The use of metasmectite accelerates the aluminate clinker reaction and influences the degree of hydration of alite. Its chemical reactivity can be demonstrated in clinker-free as well as model cement systems by direct quantification of the metasmectite, its portlandite consumption and C-S-H formation. The influence on sulfate balance reveals an interaction of metasmectite's negatively charged surfaces with ions from the pore solution and demonstrates that sulfate adsorption does not solely take place on surfaces of C-S-H. Overall, it can be concluded that the impediment of the alite hydration during early hydration due to metasmectite is rather insignificant compared to metakaolinite and is within the range of metaillite. These findings provide a significant contribution to the expected widespread use of calcined clays with a low metakaolinite content in cementitious systems.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107766"},"PeriodicalIF":10.9,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789810","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

Drying shrinkage and carbonation of steel slag-metakaolin alkali-activated composites: Effect of vegetable oil addition and slag aggregates 钢渣-偏高岭土碱活化复合材料的干燥收缩和碳化：植物油和矿渣集料的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-06 DOI: 10.1016/j.cemconres.2024.107764

O. Rudić , C. Grengg , Y. Seyrek , F. Steindl , B. Müller , I. Zögl , D. Wohlmuth , N. Ukrainczyk , F. Mittermayr

{"title":"Drying shrinkage and carbonation of steel slag-metakaolin alkali-activated composites: Effect of vegetable oil addition and slag aggregates","authors":"O. Rudić , C. Grengg , Y. Seyrek , F. Steindl , B. Müller , I. Zögl , D. Wohlmuth , N. Ukrainczyk , F. Mittermayr","doi":"10.1016/j.cemconres.2024.107764","DOIUrl":"10.1016/j.cemconres.2024.107764","url":null,"abstract":"<div><div>The influence of vegetable oil and steel slag aggregates on the drying shrinkage and carbonation performance of steel slag-based alkali activated materials was investigated. Decrease in carbonation rates by up to 19% attributed to the formation of metal soap phases which strongly reduced the gel and small capillary porosity as well as the specific surface area of the materials. When combined with steel slag aggregates, an additional reduction in carbonation rate of up to 50% could be achieved. Furthermore, the strain induced by shrinkage and rewetting was highly influenced by the type of aggregate used, with a reduction of 40 to 50% observed due to presence of soap phases resulting from the hydrolysis of oil in the metal-alkaline conditions. The observed improvement in durability properties may enable new application possibilities for alkali activated materials, overcoming well-known technical limitations such as high drying shrinkage and high carbonation rates.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107764"},"PeriodicalIF":10.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142782498","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

Revealing the tricalcium silicate formation behaviors in modified EAF slag at high temperatures for the production of electric recycled cement 揭示改性电炉炉渣在高温下的硅酸三钙形成行为，用于生产电再生水泥

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-06 DOI: 10.1016/j.cemconres.2024.107756

Mingrui Yang, Zhiming Yan, Zushu Li

引用次数: 0

Basic creep properties of hydrates in mature slag-based CEM II concretes: A micromechanical analysis 成熟渣基CEM II混凝土中水合物的基本蠕变特性：微观力学分析

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-05 DOI: 10.1016/j.cemconres.2024.107735

Maximilian Sorgner , Rodrigo Díaz Flores , Bernhard Pichler , Thomas Pilgerstorfer , Bernd Moritz , Christian Hellmich

{"title":"Basic creep properties of hydrates in mature slag-based CEM II concretes: A micromechanical analysis","authors":"Maximilian Sorgner , Rodrigo Díaz Flores , Bernhard Pichler , Thomas Pilgerstorfer , Bernd Moritz , Christian Hellmich","doi":"10.1016/j.cemconres.2024.107735","DOIUrl":"10.1016/j.cemconres.2024.107735","url":null,"abstract":"<div><div>The demand for accurate characterization of slag-based CEM II concretes is becoming increasingly important as the construction sector shifts towards eco-efficient materials. Here, the basic creep behavior of slag-based CEM II concretes is traced back to mixture-invariant hydrate properties. Therefore, an experimentally validated three-step micro-viscoelastic model for CEM I/OPC-concretes is complemented by a Powers-Acker-type hydration model for CEM II and extended towards long-term creep, temperature activation, and moisture sensitivity. This model is used for a strain rate-based, aging viscoelastic analysis of two creep tests on distinctively different CEM II concretes; revealing that the shear creep modulus of CEM II hydrates is half as large as the one of ordinary Portland cement hydrates. This makes slag-based CEM II concretes especially suitable for applications such as precast segmental tunnel linings, where a faster stress relaxation under displacement-controlled conditions is beneficial.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107735"},"PeriodicalIF":10.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142776560","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

Pyroaurite-like phases (Mg-Fe3+ LDH) synthesis and solubility 类辉钼矿相（Mg-Fe3+ LDH）的合成及溶解度

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-05 DOI: 10.1016/j.cemconres.2024.107739

Ellina Bernard , Barbara Lothenbach , Rupert J. Myers , Marcus H.N. Yio

{"title":"Pyroaurite-like phases (Mg-Fe3+ LDH) synthesis and solubility","authors":"Ellina Bernard , Barbara Lothenbach , Rupert J. Myers , Marcus H.N. Yio","doi":"10.1016/j.cemconres.2024.107739","DOIUrl":"10.1016/j.cemconres.2024.107739","url":null,"abstract":"<div><div>This study explores different methods for precipitating carbonated Mg-Fe<sup>3+</sup> layered double hydroxides (LDHs) with Mg/Fe<sup>3+</sup> ratios ranging from 2 to 2.5. Two synthesis approaches were investigated: a) CO<sub>3</sub>-Mg-Fe<sup>3+</sup>-LDH co-precipitated directly from MgO, Fe(NO<sub>3</sub>)<sub>3</sub> and Na<sub>2</sub>CO<sub>3</sub> and b) NO<sub>3</sub>-Mg-Fe<sup>3+</sup>-LDH precipitated by adding NaOH to Mg(NO<sub>3</sub>)<sub>2</sub>-Fe(NO<sub>3</sub>)<sub>3</sub> solutions, followed by ion exchange with Na<sub>2</sub>CO<sub>3</sub> to form CO<sub>3</sub>-Mg-Fe<sup>3+</sup>-LDH. The solids were characterised using TGA, XRD and FTIR. For the co-precipitated samples in the presence of Na<sub>2</sub>CO<sub>3</sub>, the formation of carbonate-LDH was accompanied by ~10–30 wt% of hydromagnesite, while CO<sub>3</sub>-Mg-Fe<sup>3+</sup>-LDH modified from the NO<sub>3</sub>-Mg-Fe<sup>3+</sup>-LDH did not show any other Mg‑carbonates but contained Fe hydroxides, as evidenced by their brown coloration. All samples were re-equilibrated at 7, 20 and 50 °C. The solubility product (log Kso) was calculated from solution analysis, and preliminary thermodynamic data are presented. The findings provide insights into the stability and formation conditions of carbonated Mg-Fe<sup>3+</sup> LDH phases in carbonate-rich environments.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107739"},"PeriodicalIF":10.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142776419","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

Estimation of cement content in concrete by spatially resolved laser induced breakdown spectroscopy 空间分辨激光诱导击穿光谱法估算混凝土中水泥含量

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-05 DOI: 10.1016/j.cemconres.2024.107714

Tobias Völker , Friedrich M. Mensing , Sabine Kruschwitz

{"title":"Estimation of cement content in concrete by spatially resolved laser induced breakdown spectroscopy","authors":"Tobias Völker , Friedrich M. Mensing , Sabine Kruschwitz","doi":"10.1016/j.cemconres.2024.107714","DOIUrl":"10.1016/j.cemconres.2024.107714","url":null,"abstract":"<div><div>The cement content in concrete significantly influences critical properties such as durability, permeability, strength, and workability. Traditional methods for estimating the cement content face limitations. These include the need for comprehensive chemical and solubility knowledge, extensive sample preparation, and their time-consuming and destructive nature. This study investigates the application of laser-induced breakdown spectroscopy (LIBS) as an alternative method. It involves probing concrete samples with high spatial resolution and analyzing the resultant spectra. The methodology is first tested on mesoscale concrete models to assess limitations and inherent errors. Subsequently, the methodology is applied to actual concrete samples with varying cement content and aggregate size distributions. The results demonstrate a promising accuracy, with an average relative error of approximately 8%. This paper offers a comprehensive evaluation of the method’s advantages, limitations, and factors influencing its practical applicability in field conditions.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"189 ","pages":"Article 107714"},"PeriodicalIF":10.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142776422","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 evaluation of laboratory methods for performance assessment of cementitious materials in wastewater networks: Biological and chemical tests versus field exposure 污水管网中胶凝材料性能评估的实验室方法的比较评价：生物和化学试验与现场暴露

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-11-30 DOI: 10.1016/j.cemconres.2024.107741

Alexandra Bertron , Cyrill Grengg , Matthieu Peyre Lavigne , Holger Wack , Gregor J.G. Gluth , Amr Aboulela , Vanessa Sonois , Tilman Gehrke , Florian Mittermayr

{"title":"Comparative evaluation of laboratory methods for performance assessment of cementitious materials in wastewater networks: Biological and chemical tests versus field exposure","authors":"Alexandra Bertron , Cyrill Grengg , Matthieu Peyre Lavigne , Holger Wack , Gregor J.G. Gluth , Amr Aboulela , Vanessa Sonois , Tilman Gehrke , Florian Mittermayr","doi":"10.1016/j.cemconres.2024.107741","DOIUrl":"10.1016/j.cemconres.2024.107741","url":null,"abstract":"<div><div>The biodeterioration of concrete elements in sewer systems and their repair is of significant economic and societal concern. However, the available test methods to assess the performance of cementitious materials under the relevant conditions are insufficiently validated. In the present study, two biological test methods and a standardised chemical test were applied to two sewer repair mortars and a reference mortar, and the performances of these materials were compared in a severely deteriorating sewer environment. In both biological tests, the induction period was considerably shorter than that of the field, and time-resolved recording of durability indicators enabled to determine deterioration rates in the steady-state regime, which compared reasonably well with each other and with the behaviour in the sewer environment. The chemical test does not allow to obtain a deterioration rate, and the observed relative performance differences of the mortars deviated from the results of the biological tests.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"188 ","pages":"Article 107741"},"PeriodicalIF":10.9,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753009","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 flow rate on spatio-temporal deterioration of concrete under flowing sulfate attack 流速对流动硫酸盐侵蚀下混凝土时空劣化的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-11-28 DOI: 10.1016/j.cemconres.2024.107734

Fujian Yang , Zhihao Zhao , Yuan Liu , Man Li , Jinliang Song , Dawei Hu , Hui Zhou

引用次数: 0

Penetration test of sheet-like indenter for yield stress assessment of 3D-printed concrete 用于评估 3D 打印混凝土屈服应力的片状压头渗透试验

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2024-11-26 DOI: 10.1016/j.cemconres.2024.107728

Haoyu Lu, Lizhi Zhang, Junkai Wang, Zhaoxin Shi, Wei She, Wenqiang Zuo

{"title":"Penetration test of sheet-like indenter for yield stress assessment of 3D-printed concrete","authors":"Haoyu Lu, Lizhi Zhang, Junkai Wang, Zhaoxin Shi, Wei She, Wenqiang Zuo","doi":"10.1016/j.cemconres.2024.107728","DOIUrl":"10.1016/j.cemconres.2024.107728","url":null,"abstract":"<div><div>The evolution of early mechanical properties of 3D-printed concrete (3DPC) plays a crucial role in early constructability, while current methods face challenges on the tradeoff between the accuracy and feasibility of mechanical properties characterization. In this paper, we designed a sheet-like indenter configuration to quantitatively obtain the yield stress of fresh 3DPC. First, we show the typical force-depth curve of sheet-like indenters obtained during the penetration test and analyze the main factors affecting the penetration resistance at various regimes. Then, we derive the quantitative correlation between the yield stress and the force-depth curve based on numerical simulation. Our results show that the slipping phenomenon between the indenter side and the material leads to an underestimation of the yield stress compared to the standard compression test and cone-shaped indenter. We moreover propose a sheet-like indenter with surface roughness modification to obtain the accurate yield stress value, together with a formula for the yield stress calculation based on the force-depth curve. Finally, we assess the feasibility of the proposed approach, which can robustly predict fresh 3DPC with yield stresses in the range of 1–100 kPa.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"188 ","pages":"Article 107728"},"PeriodicalIF":10.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706203","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