Cement and Concrete Research最新文献

Impact of nesquehonite on hydration and strength of MgO-based cements

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-20 DOI: 10.1016/j.cemconres.2024.107772

Paula Montserrat-Torres, Frank Winnefeld, Barbara Lothenbach

{"title":"Impact of nesquehonite on hydration and strength of MgO-based cements","authors":"Paula Montserrat-Torres, Frank Winnefeld, Barbara Lothenbach","doi":"10.1016/j.cemconres.2024.107772","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107772","url":null,"abstract":"Hydrated magnesium carbonate cements prepared from MgO and carbonates such as hydromagnesite (Mg5(CO3)4(OH)2·4H2O) or nesquehonite (MgCO3ˑ3H2O) have potential for carbon sequestration during hardening. This study investigates the hydration of MgO/nesquehonite blends with up to 50 wt% of nesquehonite. Nesquehonite is highly reactive in the presence of MgO and water. The replacement of 50 wt% MgO by nesquehonite causes a significant increase of compressive strength at higher nesquehonite contents with up to 43–44 MPa after 28 days. However nesquehonite delays early hydration and strength development. Progressive changes in XRD peak position and peak broadening with increasing amount of carbonate indicate the formation of hydrous carbonate-containing brucite, HCB, with variable content of gel-like water and CO2 as confirmed by FTIR and TGA. This research indicate a high potential of nesquehonite to permanently store CO2 in MgO-based cements, as up to 15 wt% of CO2 can be taken up in the hydrated solid phase.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"53 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857996","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

An experimental review of the reaction paths followed by alkali-activated slag pastes 碱活性渣浆反应路径的实验回顾

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-17 DOI: 10.1016/j.cemconres.2024.107765

C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba

{"title":"An experimental review of the reaction paths followed by alkali-activated slag pastes","authors":"C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba","doi":"10.1016/j.cemconres.2024.107765","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107765","url":null,"abstract":"NMR, XRD, mechanical strength measurements, bound water quantification and isothermal calorimetry were combined to contrast the degree of reaction and the paths followed by slag under the influence of three activators: NaOH, Na2CO3, and Na2Si1.7O4.4. NaOH-activation led to the concomitant formation of a very ordered C-A-S-H gel and of hydrotalcite, giving rise to early mechanical strength. For Na2Si1.7O4.4, a N-A-S-H gel formed first due to the high quantities of silicon in solution. This led to quick setting but no mechanical strength. Later, an amorphous C-A-S-H gel provided mechanical strength, while an aluminate phase precipitated. Finally, Na2CO3-activation also led to the formation of N-A-S-H, formation favored by the initial consumption of calcium to form calcite. This did not bring any real structuration and mechanical strength. Only after a few days of hydration did the mechanical strength improve with the precipitation of amorphous C-A-S-H, an ill-defined hydrated aluminate phase, and of gaylussite.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"78 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841253","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

On the variability of industrial Portland cement clinker: Microstructural characterisation and the fate of chemical elements 工业波特兰水泥熟料的变异性：微观结构特征和化学元素的归宿

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-16 DOI: 10.1016/j.cemconres.2024.107773

Wahab Abdul, Christiane Rößler, Holger Kletti, Chancel Mawalala, Alexander Pisch, Marcus N. Bannerman, Theodore Hanein

{"title":"On the variability of industrial Portland cement clinker: Microstructural characterisation and the fate of chemical elements","authors":"Wahab Abdul, Christiane Rößler, Holger Kletti, Chancel Mawalala, Alexander Pisch, Marcus N. Bannerman, Theodore Hanein","doi":"10.1016/j.cemconres.2024.107773","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107773","url":null,"abstract":"Portland cement (PC) has been used and developed since the early 19th century. Although the compositional ranges of PC clinkers are generally specified in standards, there is a lack of information on the variability of industrial clinkers. Furthermore, with an increase in the use of alternative mineral and fuel feeds, it is important to understand the evolution of clinker chemistry and mineralogy which affects hydraulic reactivity. In this work, 27 clinkers, selected to span the limits of clinker manufacturing, are characterised using X-Ray fluorescence (XRF), X-Ray diffraction (XRD), and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDX). These are compared against clinker data from literature, which provides a comparison between modern clinkers and historical clinkers analysed over 50 years ago. Finally, the clinker datasets are used to carry out and compare different calculation methods including Bogue, modified Bogue, and Gibbs energy minimisation using a published stoichiometric thermodynamic database.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"19 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825561","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

Production of alinite-chlormayenite clinker and its hydration behavior with increasing gypsum content

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-12 DOI: 10.1016/j.cemconres.2024.107774

Marco Simoni, Aniruddha Baral, Zhili Ren, Tristana Y. Duvallet, Robert B. Jewell, Christiane Rößler, Theodore Hanein

引用次数: 0

Modeling and simulation of alkali-activated materials (AAMs): A critical review

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-10 DOI: 10.1016/j.cemconres.2024.107769

Yibing Zuo, Yun Chen, Chen Liu, Yidong Gan, Luise Göbel, Guang Ye, John L. Provis

引用次数: 0

Understanding hydration reactions, mechanical properties, thermal expansion, and organic interfacial interactions of calcium sulfate hydrates from the atomic scale

IF 11.4 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":"https://doi.org/10.1016/j.cemconres.2024.107740","url":null,"abstract":"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.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"60 1","pages":""},"PeriodicalIF":11.4,"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

IF 11.4 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":"https://doi.org/10.1016/j.cemconres.2024.107766","url":null,"abstract":"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.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"2 1","pages":""},"PeriodicalIF":11.4,"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":"","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

IF 11.4 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

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

IF 11.4 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

IF 11.4 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

引用次数: 0