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2021 Vol.20, Issue 4

Research Article

The Strength Characteristics of CO2-reducing Cement Mortar using Porous Feldspar and Graphene Oxide

다공성 장석 및 산화그래핀을 적용한 탄소저감형 시멘트 모르타르 강도특성

Jong-Young Lee1
,
Jung-Geun Han2*
이 종영1
,
한 중근2*
1Member, Research Professor, Department of Civil and Environmental Engineering, Chung-Ang Univ., 84 Heukseok-Ro, Dongjak-gu, Seoul 06974, Republic of Korea
2Member, Professor, Department of Civil&Environmental Engineering and Intelligent Energy&Industry, Chung-Ang Univ., 84 Heukseok-Ro, Dongjak-gu, Seoul 06974, Republic of Korea
*Corresponding Author
31 December 2021. pp. 1-7
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Abstract

In response to the carbon emission reduction trends and the depletion of natural sand caused by the use of cement in construction works, graphene oxide and porous feldspar were applied as countermeasures in this study. By using (3-aminopropyl)trimethoxysilane-functionalized graphene oxide with enhanced bond characteristics, a concrete specimen was prepared with 5% less cement content than that in a standard mortar mix, and the compressive strengths of the specimens were examined. The compressive strengths of the specimen with (3-aminopropyl)trimethoxysilane-functionalized graphene oxide and porous feldspar and the specimen with standard mixing were 26MPa and 28MPa, respectively, showing only a small difference. In addition, both specimens met the compressive strength of cement mortar required for geotechnical structures. It is believed that a reasonable level of compressive strength was maintained in spite of the lower cement content because the high content of pozzolans, namely SiO2 and Al2O3, in the porous feldspar enhanced the reactions with Ca(OH)2 during hydration, the nano-sized graphene surface acted as a reactive surface for the hydration products to react actively, and the strong covalent bonding of the carboxyl functional group increased the bonding strength of the hydration products.

Keywords
Carbon reduction
Graphene oxide
Compressive strength
Porous feldspar

본 연구에서는 건설공사시 시멘트 사용에 따른 탄소배출 저감과 천연모래 고갈에 따른 대응방안으로 산화그래핀 및 다공성 장석을 적용하였다. 산화그래핀은 부착특성을 증가시키기 위해 (3-aminopropyl)trimethoxysilane으로 기능화 시켰으며, 이를 적용하여 표준배합 모르타르 대비 시멘트 함량을 5% 감소시킨 배합조건으로 공시체를 제작하여 압축강도를 평가하였다. 다공성 장석과 기능화된 산화그래핀이 적용된 시편과 표준배합시편의 압축강도는 각각 26MPa, 28MPa로 큰 편차를 보이지 않았으며, 지반구조물에서 요구하는 시멘트 모르타르의 압축강도를 만족하는 것으로 평가되었다. 시멘트 함량감소에도 적정강도를 유지할 수 있는 원인으로는 다공성 장석에 대표적 포졸란 성분인 SiO2와 Al2O3가 다량으로 함유되어 수화과정에서 Ca(OH)2와의 반응을 증가시켰고, 나노크기의 그래핀 표면이 수화생성물이 활발히 반응할 수 있는 반응면으로 작용하였으며, Carboxyl 작용그룹의 강력한 공유결합 특성이 수화물의 결합강도를 증가시켰기 때문에 시멘트 함량을 감소시켰음에도 적정한 압축강도가 유지되었던 것으로 판단된다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 20
  • No :4
  • Pages :1-7
  • Received Date : 2021-11-04
  • Revised Date : 2021-11-09
  • Accepted Date : 2021-11-11
  • DOI :https://doi.org/10.12814/jkgss.2021.20.4.001
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