Settlement analysis and environmental assessment of deep mixing binders: A Plaxis 2D study with Volume Averaging Technique

Visa enkel post
dc.contributor.authorWahlgren, Leo
dc.contributor.authorPrahl Blackby, Viktoria
dc.contributor.departmentChalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE)sv
dc.contributor.examinerDijkstra, Jelke
dc.contributor.supervisorAbed, Ayman
dc.date.accessioned2021-06-21T11:37:09Z
dc.date.available2021-06-21T11:37:09Z
dc.date.issued2021sv
dc.date.submitted2020
dc.description.abstractConstructing road embankments on soft clay is combined with a high risk of excessive settlements and stability problems. As a ground improvement measure, deep mixing is often used by injecting cement as columns in the soil to increase the strength and stiffness. The cement production is a heavy source of green house gas emissions and implementing cementitious binder substitutes with lower environmental impact is a vital key for a sustainable construction future. This thesis aimed to investigate the deep mixing performance on vertical settlements and compare the environmental impact between SH cement, Multicem and a mixture of 80 % Slag Bremen and 20 % cement. The vertical settlement assessment was carried out with the finite element software Plaxis 2D, incorporating Volume Averaging Technique. Volume Averaging Technique homogenises the material models S-CLAY1S and MNhard in order to capture the behaviour of enhanced clay, S-CLAY1S for clay and MNhard for mixed columns. The soil and column data were gathered from both empirical assumptions and a geotechnical study for an existing road project. A material optimisation process in terms of volume ratio was performed by investigating the smallest amount of binder columns necessary to reach the settlement demands for a road embankment. Based on the volume ratio, each binder’s environmental impact was estimated with a simplified life cycle assessment. The results from the optimisation study showed that the binder recipes exhibited a close range of required volume ratios, despite varying stiffnesses. From the life cycle assessment estimations, Slag Bremen mixture and Multicem yielded less kg CO2-eq per meter road section than SH cement, 70 % and 50 % respectively. The most obvious finding to emerge from this study was that SH cement’s high stiffness did not compensate for it’s high emissions.sv
dc.identifier.coursecodeACEX30sv
dc.identifier.urihttps://hdl.handle.net/20.500.12380/302653
dc.language.isoengsv
dc.setspec.uppsokTechnology
dc.subjectCarbon dioxide equivalentssv
dc.subjectVolume Averaging Techniquesv
dc.subjectS-CLAY1Ssv
dc.subjectSoft soilssv
dc.subjectPlaxis 2Dsv
dc.subjectMNhardsv
dc.subjectDeep mixingsv
dc.subjectGeotechnicssv
dc.subjectLife Cycle Assessmentsv
dc.subjectSoft claysv
dc.titleSettlement analysis and environmental assessment of deep mixing binders: A Plaxis 2D study with Volume Averaging Techniquesv
dc.type.degreeExamensarbete för masterexamensv
dc.type.uppsokH
Ladda ner
Original bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
Chalmers Open Digital Repository Settlement analysis and environmental assessme.pdf
Storlek:
23.99 MB
Format:
Adobe Portable Document Format
Beskrivning:
Ladda ner
License bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
license.txt
Storlek:
1.14 KB
Format:
Item-specific license agreed upon to submission
Beskrivning:
Ladda ner
Samling
Examensarbeten för masterexamen