Cement and Concrete Research最新文献

From bauxite residue mineralogy to reactivity and properties of blended cements 从铝矾土残渣矿物学到混合水泥的反应性和特性

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-03 DOI: 10.1016/j.cemconres.2025.107854

Michael Wenzel, Fabien Georget, Thomas Matschei

引用次数: 0

Mechanisms governing in-depth infiltration of crack filling solutions in concrete using a magnetic approach

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-01 DOI: 10.1016/j.cemconres.2025.107856

Onur Ozturk, Sriramya Duddukuri Nair

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Freezing behavior of ionic solutions within calcium silicate hydrate gel pores

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-03-01 DOI: 10.1016/j.cemconres.2025.107841

Songyue Chai , Jianyu Song , Muhan Wang , Yue Zhang , Bo-Tao Huang , Bing Yin , Pan Wang , Dongshuai Hou

{"title":"Freezing behavior of ionic solutions within calcium silicate hydrate gel pores","authors":"Songyue Chai , Jianyu Song , Muhan Wang , Yue Zhang , Bo-Tao Huang , Bing Yin , Pan Wang , Dongshuai Hou","doi":"10.1016/j.cemconres.2025.107841","DOIUrl":"10.1016/j.cemconres.2025.107841","url":null,"abstract":"<div><div>Salt-frost damage is a crucial issue affecting the durability of concrete structures, however, the freezing behavior and micro-mechanisms of ionic solutions within cementitious material gel pores remain unclear, which is not conducive to optimizing cold-resistant concrete design from the bottom up. In this study, the models of saturated calcium silicate hydrate (C-S-H) gel pores containing NaCl, Na<sub>2</sub>SO<sub>4</sub>, and aqueous solution, respectively, were constructed by molecular dynamics (MD) simulation. We investigated the freezing behavior of ionic solutions within the gel pores at 230 K. The freezing process of models exhibited a distinct periodic pattern. Na<sup>+</sup> and Cl<sup>−</sup> delayed the freezing of pore water, while <span><math><msubsup><mi>SO</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></math></span> accumulated near the freezing front, significantly hindering freezing progression. The freezing resulted in two types of nano brine pockets in the NaCl model. This work provides new molecular insights into salt freezing in cementitious materials and informs the design of cold-resistant concrete at the molecular scale.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107841"},"PeriodicalIF":10.9,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518892","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

Effects of nano- and micro-cellulose on Ca(OH)2 formation: Implications for lime-based binders

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-27 DOI: 10.1016/j.cemconres.2025.107851

Paulina Guzmán García Lascurain , Carlos Rodriguez-Navarro , Lucia Toniolo , Sara Goidanich

{"title":"Effects of nano- and micro-cellulose on Ca(OH)2 formation: Implications for lime-based binders","authors":"Paulina Guzmán García Lascurain , Carlos Rodriguez-Navarro , Lucia Toniolo , Sara Goidanich","doi":"10.1016/j.cemconres.2025.107851","DOIUrl":"10.1016/j.cemconres.2025.107851","url":null,"abstract":"<div><div>Air lime-based mortars and plasters are preferred for the restoration of historic masonry due to their high compatibility, and for modern constructions given their lower environmental impact. However, their slow setting (via carbonation) and their limited strength hinder their widespread use. This study explores the influence of nano- and micro-cellulose additives dosed during lime slaking on the formation and textural/structural features of calcium hydroxide. The alkaline degradation of the additives, along with their interaction and adsorption/occlusion during heterogeneous and homogeneous precipitation of calcium hydroxide was studied. Both additives foster the non-classical crystallization of portlandite via amorphous phases, resulting in plate-like crystals in the case of nano-cellulose, whereas more reactive micro-cellulose promotes the stabilization of a dense liquid precursor, and upon its dehydration, the stabilization of amorphous calcium hydroxide. Ultimately both additives lead to the formation of potentially more reactive nano and mesostructured Ca(OH)<sub>2</sub> particles.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107851"},"PeriodicalIF":10.9,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509904","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

Water's grip on CO2 intake in mesopores of dicalcium silicate

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-26 DOI: 10.1016/j.cemconres.2025.107842

Gen Li , Yong Tao , Yining Gao , Peiliang Shen , Xiong Qian , Binbin Yin , Roland J.-M. Pellenq , Chi Sun Poon

{"title":"Water's grip on CO2 intake in mesopores of dicalcium silicate","authors":"Gen Li , Yong Tao , Yining Gao , Peiliang Shen , Xiong Qian , Binbin Yin , Roland J.-M. Pellenq , Chi Sun Poon","doi":"10.1016/j.cemconres.2025.107842","DOIUrl":"10.1016/j.cemconres.2025.107842","url":null,"abstract":"<div><div>While carbon sequestration with dicalcium silicate (C<sub>2</sub>S) offers a promising approach, the underlying mechanisms governing the contrasting carbonation efficiencies of different polymorphs remain poorly understood. Taking three C<sub>2</sub>S polymorphs as a paradigm, this study uses Grand Canonical Monte Carlo simulations to investigate CO<sub>2</sub> physisorption within α<sub>L</sub>-, β-, and γ-C<sub>2</sub>S mesopores under dry, unhydrated, and hydrated conditions. Our findings show that in dry scenarios, solid-gas interactions dominate, with γ-C<sub>2</sub>S exhibiting the lowest CO<sub>2</sub> intake due to its high surface charge density. A nanometer-thick water film in humid environments significantly enhances CO<sub>2</sub> adsorption due to the liquid-gas interactions, which are mediated by surface charges via the polarization of water molecules. Surface hydroxylation increases surface charge density in hydrated α<sub>L</sub>- and β-C<sub>2</sub>S and reduces their CO<sub>2</sub> adsorption capacity. The slower hydration of γ-C<sub>2</sub>S leads to a comparatively higher CO<sub>2</sub> adsorption capacity, suggesting a larger CO<sub>2</sub> reservoir within its mesopores. This enhanced CO<sub>2</sub> availability potentially explains the experimentally observed superior carbonation efficiency of γ-C<sub>2</sub>S and demonstrates a vivid example of the competing effect of hydration and carbonation for cement minerals. These molecular-level insights provide a profound understanding of the complex interplay between surface properties, hydration, and CO<sub>2</sub> physisorption in the carbonation of C<sub>2</sub>S and other carbonatable materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107842"},"PeriodicalIF":10.9,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143488500","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 aluminum dihydrogen phosphate in enhancing mechanical properties and water resistance of magnesium phosphate cement

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-24 DOI: 10.1016/j.cemconres.2025.107849

Xingyu Gan , Haiming Zhang , Zeyu Lu , Kai Ma , Xiaowen Chen , Lingchao Lu , Laibo Li

{"title":"Effect of aluminum dihydrogen phosphate in enhancing mechanical properties and water resistance of magnesium phosphate cement","authors":"Xingyu Gan , Haiming Zhang , Zeyu Lu , Kai Ma , Xiaowen Chen , Lingchao Lu , Laibo Li","doi":"10.1016/j.cemconres.2025.107849","DOIUrl":"10.1016/j.cemconres.2025.107849","url":null,"abstract":"<div><div>Incorporating aluminum dihydrogen phosphate into magnesium phosphate cement (MPC), including magnesium ammonium phosphate cement (AMAPC) and magnesium potassium phosphate cement (AMKPC), significantly enhances both compressive strength and water resistance. The results show that AMAPC-3 exhibited a remarkable increase in compressive strength, maintaining a compressive strength retention ratio of 0.83 after 60 days. The addition of aluminum dihydrogen phosphate introduced extra phosphate ions that facilitated the hydration of unreacted MgO, resulting in an increased formation of hydration products such as struvite and k-struvite. Furthermore, it participated in independent hydration reactions, generating new phase Al(OH)<sub>3</sub> gel and Al(PO<sub>4</sub>)·2H<sub>2</sub>O gel, which contributed to a denser microstructure. Microstructural analysis confirmed a refined pore structure and reduced porosity in the modified cements. These findings position aluminum dihydrogen phosphate as an effective modifier for enhancing the water resistance and mechanical properties of MPCs.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107849"},"PeriodicalIF":10.9,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479782","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

Electron energy loss spectroscopy of nanoscale local structures in calcium silicate hydrate

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-24 DOI: 10.1016/j.cemconres.2025.107840

Chengyao Liang , Qi Zheng , Roya Maboudian , Paulo J.M. Monteiro , Shaofan Li

{"title":"Electron energy loss spectroscopy of nanoscale local structures in calcium silicate hydrate","authors":"Chengyao Liang , Qi Zheng , Roya Maboudian , Paulo J.M. Monteiro , Shaofan Li","doi":"10.1016/j.cemconres.2025.107840","DOIUrl":"10.1016/j.cemconres.2025.107840","url":null,"abstract":"<div><div>Calcium silicate hydrate (C-S-H) is a crucial cement hydration product for the strength and durability of concrete. While previous studies have extensively investigated the structural and compositional characteristics of C-S-H, they mostly focused on average properties within ensemble systems. In this work, we use electron energy loss spectroscopy (EELS), electron nano-tomography, and other spectroscopies to study the local structure of C-S-H at an unprecedented spatial resolution of 5 nm. The chemical environments of silicon (Si) and calcium (Ca) elements, thickness, and dielectric properties are scrutinized. Statistical analysis of over 10,000 data points reveals significant heterogeneity in the silicate chemical environment, including different polymerization degrees and tetrahedral distortions. In contrast, the local Ca environment exhibits more homogeneity with a coordination number ranging from 7 to 9, indicating a weak octahedral-like symmetry for C-S-H. Additionally, our findings show that the local thickness of C-S-H predominantly hovers around ∼15 nm consisting of 13–14 layers, validated through electron tomography. This work provides insights into the local structural features of C-S-H from the single colloid perspective and thus facilitates the future development of more realistic C-S-H models.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107840"},"PeriodicalIF":10.9,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474758","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 origins of anisotropy of extrusion-based 3D printed concrete: The roles of filament skin and agglomeration

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-20 DOI: 10.1016/j.cemconres.2025.107817

John Temitope Kolawole , Richard Buswell , Sultan Mahmood , Muhammad Nura Isa , Sergio Cavalaro , Simon Austin , Dirk Engelberg , James Dobrzanski , Jerry Xu , Philip J. Withers

{"title":"On the origins of anisotropy of extrusion-based 3D printed concrete: The roles of filament skin and agglomeration","authors":"John Temitope Kolawole , Richard Buswell , Sultan Mahmood , Muhammad Nura Isa , Sergio Cavalaro , Simon Austin , Dirk Engelberg , James Dobrzanski , Jerry Xu , Philip J. Withers","doi":"10.1016/j.cemconres.2025.107817","DOIUrl":"10.1016/j.cemconres.2025.107817","url":null,"abstract":"<div><div>One of the most significant challenges facing extrusion-based 3D concrete printing (3DCP) is the anisotropy present in the printed material: under load, the observed performance is typically lower than a cast equivalent and significantly so in certain directions. In addition, the performance is also more variable than cast material. These observations are, in part, due to surface moisture evaporation and air entrapment. Here, we investigate the hypothesis that the printed concrete comprises of agglomerated filament core and skin having distinct properties as a necessary consequence of the printing process. Through novel X-ray computed tomography measurements, we show that printed concrete comprises the core and Filament Interfacial Zone Network (FIZN) and that, in contrast to the cores, the FIZN is found to be free from pores except at boundaries where there is incomplete bonding. Through morphological, chemical and mechanical analysis, the FIZN is also found to contain 20% less sand and 60% more anhydrous cement than the filament cores, while the FIZ material was inferred to have 11% higher compressive strength, 28% lower flexural strength and 22% lower elastic modulus than the core. The findings from this work suggest that anisotropy will always exist and that care should be devoted to the material rheology, printing system and the filaments arrangement in order to produce consistent and predictable hardened material properties.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"192 ","pages":"Article 107817"},"PeriodicalIF":10.9,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463168","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

Quantification of nano-crystalline C-S-H in hydrated tricalcium silicate, Portland cement and fly ash cement using PONKCS method

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-18 DOI: 10.1016/j.cemconres.2025.107837

Xuerun Li , Karen L. Scrivener

引用次数: 0

Nonlinear creep of concrete: Stress-activated stick–slip transition of viscous interfaces and microcracking-induced damage

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-02-16 DOI: 10.1016/j.cemconres.2025.107809

Rodrigo Díaz Flores, Christian Hellmich, Bernhard Pichler

{"title":"Nonlinear creep of concrete: Stress-activated stick–slip transition of viscous interfaces and microcracking-induced damage","authors":"Rodrigo Díaz Flores, Christian Hellmich, Bernhard Pichler","doi":"10.1016/j.cemconres.2025.107809","DOIUrl":"10.1016/j.cemconres.2025.107809","url":null,"abstract":"<div><div>With the aim to identify the mechanisms governing nonlinear basic creep of concrete under uniaxial compression, a micromechanics model is presented. Extending the affinity concept for nonlinear creep, it describes that every microcrack incrementally increases the damage of concrete, leading to a step-wise increase of its compliance. Experimental data are taken from the literature. Strain and acoustic emission measurements from a multi-stage creep test are used to develop the model. This includes identification of microcrack evolution laws for both short-term load application and sustained loading. Strain measurements from four single-stage creep tests are used for model validation. It is concluded that nonlinear creep of concrete is governed by two mechanisms: (i) stress-induced stick–slip transition of viscous interfaces at the nanostructure of cement paste, which is phenomenologically accounted for by the affinity concept, and (ii) microcracking-induced damage, which is of major importance once the stress exceeds some 70% of the strength.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"191 ","pages":"Article 107809"},"PeriodicalIF":10.9,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417499","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