Effect of high pump pressure on chloride migration in ITZ of concrete - Details

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Abstract：

Concrete　pumping　tests　with　distances　of　150,　300,　450,　600,　and　750　m　were　conducted　to　study　the　influence　of　pumping　on　the　compressive　strength　and　the　chloride　migration　of　concrete.　Long-distance　pumping　had　a　significant　impact　on　the　chloride　migration　coefficient　of　concrete,　and　it　was　observed　that　the　Cl−　migration　coefficient　of　concrete　decreased　with　an　increase　in　the　pumping　distance.　When　the　pumping　distance　was　750　m,　the　Cl−　diffusion　coefficient　of　C40　and　C60　concrete　decreased　by　28.73　and　27.65%,　respectively.　The　Backscatter　(BSE)　test　was　conducted,　and　the　porosity　and　thickness　of　ITZ　were　determined　following　the　threshold　segmentation　method.　The　porosity　and　thickness　of　ITZ　decreased　with　an　increase　in　the　pumping　distance.　When　pumped　over　a　distance　of　750　m　for　C40　and　C60　concrete,　the　porosity　of　ITZ　decreased　by　59.78　and　58.57%,　respectively,　and　the　thickness　of　ITZ　decreased　by　26.43　and　25.96%,　respectively.　The　effect　of　pumping　on　the　porosity　of　ITZ　was　greater　than　that　on　the　thickness　of　ITZ.　Considering　ITZ　effect,　dilution　effect　and　tortuosity　effect,　the　influence　of　pumping　on　chloride　migration　coefficient　of　concrete　was　analyzed　and　calculated　quantitatively.　©　2023　Elsevier　Ltd

Keyword：

ITZ Pumping concrete High-pressure Porosity Cl− migration coefficient

Author Community：

[ 1 ] [Hao J.]Inner Mongolia Engineering Research Center of Testing and Strengthening for Bridges, Inner Mongolia University, Hohhot, 010020, China
[ 2 ] [Hao J.]The Key Laboratory of Urban Security and Disaster Engineering, MOE, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Yu B.]Inner Mongolia Engineering Research Center of Testing and Strengthening for Bridges, Inner Mongolia University, Hohhot, 010020, China
[ 4 ] [Li Y.]The Key Laboratory of Urban Security and Disaster Engineering, MOE, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Mu J.]The Key Laboratory of Urban Security and Disaster Engineering, MOE, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Sui C.]Inner Mongolia Engineering Research Center of Testing and Strengthening for Bridges, Inner Mongolia University, Hohhot, 010020, China
[ 7 ] [Cui Y.]College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China

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Source ：

Journal of Building Engineering

ISSN： 2352-7102

Year： 2023

Volume： 66

6 . 4 0 0

JCR@2022

Cited Count：

WoS CC Cited Count： 0

SCOPUS Cited Count： 6

ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 0

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