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RISS 인기검색어
- 검색키워드
- 저자 : Darkhijav, B. (검색결과 2 건)
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INFLUENCE OF BASALT FIBRES ON THE PROPERTIES OF FLY ASH BASED GEOPOLYMER BINDER
Temuujin, J.,Minjigmaa, A.,Davaabal, B.,Darkhijav, B.,Ruescher, C.H. Korean Association for Particle and Aerosol Resear 2016 Particle and Aerosol Research Vol.12 No.2
The influence of basalt fibres on the compressive strength of the geopolymer type binders has been studied. For the experiments 2 types of the basalt fibres were used, namely chopped and spooled fibres. Both types of basalt fibres were 7-10 micron thick in diameter and cut into pieces of 6 mm length. The fibres were mixed with 1% weight to the fly ash powder, followed by the addition of the activator solution (8M NaOH). The pastes obtained were cured at $70^{\circ}C$ for 20 h revealing compact bodies. Compressive strength was measured after 7 days and microstructure observation performed with SEM. The cube bodies ($2{\times}2{\times}2cm$) reveal compressive strength of 47.25(4.03) MPa, while it decreased to 34.0(9.05) MPa in spooled basalt fibres and to 17.33(5.86) MPa in the chopped basalt fibres containing binder, i.e 76% and 36% of the strength without fibres, respectively. The much weaker compressive strength of the chopped fibres containing binder is related to the absence of significant adhesion between the geopolymer binder and the basalt fibres, forming voids instead. Alkali leaching effect of basalt fibres could probably explain the drop in the compressive strength with spooled and chopped fibres, respectively.
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A study on manufacturing CFRP rebar with a high tensile strength
Kim Nam-il,Kwon Do-young,Burenkhangai Darkhijav,Lee Kyo-moon,Bae Seoung-youl,추용식 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
In this study, high-strength CFRP using carbon fiber as the main rebar and glass fi ber for the rib was developed. For pro- duction of CFRP, physical properties of various types of fibers were examined through optical microscopy, XRD analysis, and a tensile strength test. In addition, to verify the behavior according to the carbon fi ber and the type of resin, a carbon composite was fabricated with varied fi ber content and curing temperature. The physical properties of the fabricated carbon composite were measured using tensile strength and fracture shape tests. A high-strength CFRP rebar was manufactured using the pultrusion method and its mechanical properties, specifi cally tensile strength and elastic modulus, were measured. The CFRP rebar developed in this study showed relatively higher tensile strength and elastic modulus than the existing CFRP rebars, and it appeared that the developed CFRP rebar had a relatively smaller amount of pores than existing CFRP rebars.The CFRP rebar developed in this study showed relatively higher tensile strength and elastic modulus than the existing CFRP rebars, and it appeared that the developed CFRP rebar had a relatively smaller amount of pores than existing CFRP rebars.
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