Centre for Advanced Materials and Structures YouarecordiallyinvitedtoaSeminarorganizedby
DepartmentofCivilandEnvironmentalEngineering
Newprice‐competitiveandstrongartificial
lightweightaggregatessynthesizedfrom
cementlessflyashbinder
By
JaeEunOh,Ph.D
Associateprofessor,SchoolofUrbanandEnvironmentalEngineering
UNIST(UlsanNationalInstituteofScienceandTechnology),Korea
Date:
Tuesday,9May,2017
Time: 2.30pmto3.30pm
Venue: EA#06‐03,
FacultyofEngineering,
NationalUniversityofSingapore
Abstract
Reducingthespecificgravity(SG)ofstructuralbinderpastesisonepossiblewaytoprevent
materialsegregationbetweenbinderpasteandlightweightaggregates,whichoftenoccursin
producing lightweight concrete due to their SG differences. To this end, this presentation
introducestheuseofanewlightweightflyashbinderpaste,giventhatitsSGcanlargelybe
reduced simply by increasing the water‐to‐binder (w/b) ratio without either excessive
bleedingorsignificantstrengthreduction.ClassFflyashwasactivatedwithvaryingweights
of water (i.e., w/b), Ca(OH)2, and Na2CO3 to prepare lightweight samples; compressive
strength, SG, and water absorption were measured with microstructural study using XRD,
TG,andMIP.Theresultsshowedsatisfactoryperformanceswithstrengthsof27.8–56.5MPa,
an absolute dried SG of 1.24–1.47, and water absorption of 13.3–24 wt% for selected
representative mixtures at 28 days. In particular, the strongest sample, at 56.5MPa, also
obtainedalowvalueofabsolutedriedSGof1.47,whichlaywithintherangeofovendriedSG
(~0.6–1.5)ofcommerciallightweightaggregates.
SpeakerBiography
Dr.JaeEunOhhasdevelopednewtypeofstrongcementlessbinders
that have solid price‐competitiveness to Portland cement using
industrial by‐products such as coal‐fired fly ash, ground granulated
blast furnace slag, red mud, precipitated calcium carbonates, stone
powdersludgeetc.Hehasbeenworkingasanassociateprofessorat
UNIST,Koreasince2011.HemajoredhisBSinMaterialScienceand
Engineering and got his MS in Architectural Structural Engineering
from Seoul National University. He earned his Ph.D. in Civil
Engineering at University of California, Berkeley for structural
materials.
ContactPerson: DrMoonJuHyuk Tel:65164574;Email: [email protected]
GeneralEnquiry/Registration:MsNorelaTel:65164314,Email:[email protected]
***Seatsarelimited.Pleaseregisterearly.Allarewelcomeandadmissionisfree***
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