Effect of disodium EDTA on hydration and mechanical properties of calcium sulphoaluminate-belite cement - Details

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Abstract：

Effects　of　disodium　EDTA　(EDTA-2Na)　on　hydration　and　mechanical　properties　of　calcium　sulphoaluminate-belite　cement　(CSBC)　were　investigated　systematically.　Results　show　that　EDTA-2Na　addition　leads　to　visible　changes　in　CSBC　strength　development.　0.50　%　EDTA-2Na　significantly　enhances　the　compressive　strength　by　18　%　and　23　%　compared　with　the　blank　specimens　at　7　d　and　28　d,　while　reducing　the　strength　at　8　h　and　1　d.　The　content　of　the　main　hydration　product　(AFt)　determines　the　strength　development.　At　the　early　hydration　stage,　EDTA-2Na　delays　hydration　of　ye＇elimite　to　form　AFt,　thus　decreasing　the　early　hydration　degree　of　CSBC　and　increasing　the　porosity　to　reduce　strength.　In　the　presence　of　EDTA-2Na,　the　morphology　changes　of　amorphous　aluminum　hydroxide　(AH3)　facilitate　the　AH3-C2S-CaSO4　reaction　to　increase　AFt　content　and　form　a　more　condensed　structure,　thus　enhancing　the　late　strength.　In　this　way,　the　strength　development　of　CSBC　mortars　can　be　modified　and　regulated　by　EDTA-2Na.　©　2022　Elsevier　Ltd

Keyword：

Microstructure Calcium sulfoaluminate Hydration Disodium EDTA Mechanical properties

Author Community：

[ 1 ] [Wang J.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Wang Y.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Liu H.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Chang L.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Wang H.]State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Sciences Research, Beijing, 100041, China
[ 6 ] [Wang Y.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Cui S.]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

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Source ：

Cement and Concrete Research

ISSN： 0008-8846

Year： 2023

Volume： 164

1 1 . 4 0 0

JCR@2022

ESI Discipline： MATERIALS SCIENCE;

ESI HC Threshold：26

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WoS CC Cited Count：

SCOPUS Cited Count： 13

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 9

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