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Title |
Properties of Epoxy?Modified Mortars with Alkali Activators and Ground Granulated Blast Furnace Slag
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DOI |
https://doi.org/10.11112/jksmi.2021.25.1.85 |
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Keywords |
알칼리 자극제; 고로슬래그미분말; 에폭시수지 혼입 모르타르; 강도; 경화도; 중성화; 염화물이온 침투저항성 Ground granulated blast furnace slag; Alkali activator; Epoxy-modified mortar(EMM); Strengths; Degree of hardening; Water absorption; Carbonation |
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Abstract |
The purpose of this study is to investigate the properties of hardener-free epoxy-modified mortars(EMMs) using ground granulated blast furnace slag(GGBFS) and alkali activators. The hardener-free EMMs with a GGBFS content of 20% using 4 types of alkali activators were prepared with various polymer-binder ratios, and tested for strengths, water absorption, carbonation depth, chloride ion and H2SO4 penetration depth. The conclusions obtained from the test results are summarized as follows: The compressive strength of the EMMs with a GGBFS content of 20% attains a maximum at a polymer-binder ratio of 10%. The flexural strength of the hardener-free EMMs using Ca(OH)2 as a alkali activator is improved with increasing polymer-binder ratios. However, the flexural strength of the EMMs using NaCO3, Na2SO4 and Li2CO3 is gradually decreased with increasing polymer-binder ratios. Regardless of the type of alkali activator, the water absorption, chloride ion penetration and carbonation depth are remarkably decreased with increasing polymer-binder ratios due to the epoxy film formed in the EMMs. The H2SO4 penetration depth of the hardener-free EMMs with a GGBFS content of 20% is gradually increased with increasing polymer-binder ratio. In this study, the properties of hardener-free EMMs using Ca(OH)2 as a alkali activator are more excellent than those of other alkali activators.
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