Comparison of mechanical behaviors of geopolymer and class G cement as well cement at different curing temperatures for geological sequestration of carbon dioxide

Mohamed Nasvi Mohamed Careem, Ranjith Pathegama Gamage, Jay Gnananandan Sanjayan

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

20 Citations (Scopus)

Abstract

Carbon dioxide (CO2) sequestration into deep underground reservoirs such as saline aquifers, oil reservoirs and coal seams have found out to be one of the best practical solutions to reduce significant amount of greenhouse gases from the environment. The success of any large scale CO2 sequestration project depends on many factors, and two of the important factors are (a) the stability of injection well and (b) well cement. To date, OPC based cement has been used as well cement, and it has been found that it is unstable in CO2 environments as it undergoes degradation, strength reduction, and shrinkage. Therefore, a comprehensive experimental study has been undertaken to investigate the suitability of geopolymer as well cement and the mechanical behavior of geopolymer and class G cement was compared under different down-hole temperatures. When the uniaxial compressive strength (UCS) of geopolymer and G cement was compared, it was found that geopolymer possess higher UCS values at elevated temperatures (above 50 oC) and G cement possesses the highest values at ambient conditions. The peak strength of both geopolymer and class G cement was observed at curing temperatures of 50-60 oC. In addition, acoustic emission (AE) test data revealed that the crack propagation stress thresholds of class G cement are higher at ambient conditions, whereas geopolymer possesses highest values at elevated temperatures. The photogrammetric results of strain measurement show that geopolymer undergoes shear failure at lower curing temperatures, whereas the failure was splitting at elevated temperatures. In addition, the type of failure of class G cement was shear failure for all the curing temperatures and the ultimate failure strain did not vary much with the curing temperature.
Original languageEnglish
Title of host publication46th US Rock Mechanics / Geomechanics Symposium 2012
EditorsAntonio Bobet, Russ Ewy, Murali Gadde, Joe Labuz, Laura Pyrak-Nolte, Azra Tutuncu, Erik Westman
Place of PublicationAlexandria Virginia USA
PublisherAmerican Rock Mechanics Association (ARMA)
Pages324 - 331
Number of pages8
ISBN (Print)9781622765140
Publication statusPublished - 2012
EventUS Rock Mechanics / Geomechanics Symposium 2012 - Chicago, United States of America
Duration: 24 Jun 201227 Jun 2012
Conference number: 46th

Conference

ConferenceUS Rock Mechanics / Geomechanics Symposium 2012
CountryUnited States of America
CityChicago
Period24/06/1227/06/12
OtherThe American Rock Mechanics Association invites you to its 46th Mechanics/ GeoMechanics Symposium to be held in Chicago, Illinois, USA on 24-27 june 2012

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