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Title:Corrosion mechanisms for cemented soils in three different sulfate solutions
Authors:ID Han, Pengju (Author)
ID Ren, Chao (Author)
ID Bai, Xiaohong (Author)
ID Chen, Frank (Author)
ID Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Copyright holder)
Files:.pdf Acta_geotechnica_Slovenica_2015_Han_et_al._Corrosion_mechanisms_for_cemented_soils_in_three_different_sulfate_solutions.pdf (305,84 KB)
MD5: 01FC06414283ABF68DE48B849BE5B157
PID: 20.500.12556/dkum/1867a95d-10ce-4dfe-816d-729cf90260cc
 
URL http://fgserver3.fg.um.si/journal-ags/2015-2/article-7.asp
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:In order to simulate and study the corrosion effects on the compressive strength of cemented soils that could be exposed in a polluted environment, a series of tests were conducted on cemented soil blocks cured with different concentrations of H2SO4, MgSO4, and Na2SO4 solutions. The test results show that the corrosion degree generally increases with the corrosion time and the solution concentration, while the compressive strength decreases with the increasing corrosion degree. The corrosion degree is highest for the Na2SO4 solution, followed by the MgSO4 and H2SO4 solutions. Namely, when the SO4 2- ion exists in a solution, the corrosion degree for the positive ions follows this descending order: Na+, Mg2+, and H+. X-ray diffraction (XRD) phase analyses were performed for the cemented soil samples after corrosion and ionic concentrations. The results show that the compressive strength decreases with an increase of the Mg2+ concentration in the MgSO4 solution and the Na+ concentration in the Na2SO4 solution. At the same time, the strength increases with an increase of the pH value of the H2SO4 solution. Based on the chemical analysis results, the corrosion of H2SO4 or MgSO4 solutions on cemented soils is deemed as a composite action involving the combined resolving and crystallizing corrosion processes. Furthermore, the corrosion of the Na2SO4 solution of cemented soil is a composite action consisting of dissolving and crystallizing.
Keywords:cemented soil, compressive strength, corrosion mechanism, sulfate, pollution, solution
Publication status:Published
Publication version:Version of Record
Year of publishing:2015
Number of pages:str. 77-85
Numbering:Letn. 12, št. 2
PID:20.500.12556/DKUM-70855 New window
ISSN:1854-0171
UDC:624.13
ISSN on article:1854-0171
COBISS.SI-ID:284313088 New window
NUK URN:URN:SI:UM:DK:J99Z6DHX
Copyright:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
Publication date in DKUM:15.06.2018
Views:1757
Downloads:178
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
HAN, Pengju, REN, Chao, BAI, Xiaohong and CHEN, Frank, 2015, Corrosion mechanisms for cemented soils in three different sulfate solutions. Acta geotechnica Slovenica [online]. 2015. Vol. 12, no. 2, p. 77–85. [Accessed 25 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=70855
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Record is a part of a journal

Title:Acta geotechnica Slovenica
Shortened title:Acta geotech. Slov.
Publisher:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
ISSN:1854-0171
COBISS.SI-ID:215987712 New window

Secondary language

Language:Slovenian
Title:Korozijski mehanizmi cementiranih zemljin za tri različne raztopine sulfatov
Abstract:Izveden je bil niz preizkusov na blokih cementiranih zemljin izpostavljenih različnim koncentracijam raztopin H2SO4, MgSO4 in Na2SO4, z namenom simulacije in preučitve učinkov korozije na tlačno trdnost cementiranih zemljin, ki so lahko izpostavljene onesnaženemu okolju. Rezultati preizkusov kažejo, da se stopnja korozije splošno poveča s časom korozije in koncentracije raztopine, medtem, ko tlačna trdnost pada z naraščajočo stopnjo korozijo. Stopnja korozije je največja za raztopino Na2SO4, kateri sledita raztopini MgSO4 in H2SO4. Namreč, če v raztopini obstajajo SO4 2- ioni, stopnja korozije za pozitivne ione sledi v padajočem redu Na+, Mg2+ in H+. Po koroziji in ionski koncentraciji je bila z rentgenskimi žarki izvedena difrakcijska fazna analiza na vzorcih cementiranih zemljin. Rezultati kažejo, da tlačna trdnost pada z večanjem koncentracije Mg2+ v raztopini MgSO4 in koncentracije Na+ v raztopini Na2SO4. Medtem, ko se trdnost veča z večanjem pH vrednosti raztopine H2SO4. Na osnovi rezultatov kemijskih analiz, se korozija raztopin H2SO4 ali MgSO4 na cementiranih zemljinah razume kot sestavljen učinek, ki vključuje kombinirane korozijske procese razpadanja in kristalizacije medtem, ko korozijo raztopine Na2SO4 sestavlja učinek raztapljanja in kristalizacije.
Keywords:gradbeništvo, zemljine, cementirane zemljine, tlačna trdnost, korozija, mehanizem korozije, sulfat, onesnaževanje, raztopina


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  1. Acta geotechnica Slovenica

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