• Title/Summary/Keyword: Alkali resistance

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Use of waste glass as an aggregate in GGBS based alkali activated mortar

  • Sasui, Sasui;Kim, Gyu Yong;Son, Min Jae;Pyeon, Su Jeong;Suh, Dong Kyun;Nam, Jeong Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.21-22
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    • 2021
  • This study incorporates fine waste glass (GS) as a replacement for natural sand (NS) in ground granulated blast furnace slag (GGBS) based alkali activated mortar (AAm). Tests were conducted on the AAm to determine the mechanical properties, apparent porosity and the durability based on its resistance to Na2SO4 5% and H2SO4 2% concentrated solutions. The study revealed that increasing GS up to 100 wt%, increased strength and decreased porosity. The lower porosity attained with the incorporation of GS, improved the resistance of mortar to Na2SO4 and thus increasing durability. However, the durability of mortar to H2SO4 solution was negatively impacted with the further reduction of porosity observed with increasing GS above 50 wt.% believed to be caused by the stress induced as a result of expansive reaction products created when the mortar reacted with acid.

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Development of the blended woven using fine-denier film fibers with alkali resistance property (내알칼리성 세데니어 필름사 제조를 통한 박지 필름 교직물의 개발)

  • Gwak, Seong-Hyeon;Park, Seong-U;Lee, Gwang-Tae;Park, Gi-Bung
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.143-144
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    • 2008
  • We developed that the film fibers which was vacuum-metalized silver on the PET film played a part increasing durable on the alkali, antibiotic and another functional property. For this usage, PET film fibers with fine denier vacuum-metalized silver manufactured through changing the micro slitting machine's drive process.

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Fundamental Study of Polymer-modified Cement Mortar for Maintenance in Concrete Structure According to Ambient Temperature (온도에 따른 콘크리트 구조체 단면 보수용 폴리머 모르타르의 기초적 연구)

  • Seo, Jung-Pil;Kim, Jae-Won;Lee, Jung-Koo;Choi, Hun-Gug;Kang, Cheol;Kim, Jin-Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2007.04a
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    • pp.59-62
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    • 2007
  • Nowadays, polymer-cement mortars are widely used in construction field(floorings and pavements, water-proofings, adhesives, repair materials, deck coverings, anti-corrosive linings) Because of excellent performance such as high tensile and flexural strength, waterproofness, excellent adhesion, good durability, improved wear and chemical resistances. This article presents the results of experimental study that investigates the effect of ambient temperature on the strength properties of polymer-modified cement mortar. Results show that when increasing the polymer proportion in mortar on different ambient temperature, the compressive strength and flexural strength are decreased, and also alkali resistance is decreased.

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Durability of Hydrophilic Alkali Silicate Impregnant of Concrete Structure (알칼리 실리케이트계 침투성 콘크리트 표면보호재의 내구특성)

  • Song, Hun;Lee, Jong-Kyu;Chu, Yong-Sik;Kim, Young-Yup
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2007.11a
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    • pp.91-94
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    • 2007
  • It is essential every concrete structure should continue to perform its intended functions, that is maintain its required strength and durability, during the service life. However, deterioration occurs more progressively from the outside of concrete exposed to severe conditions. Deterioration in the concrete structure is due to carbonation and chloride ion attack. Therefore, concrete structure is needed to surface protection for increase durability using impregnant. Impregnant classify into two large groups in polymeric and silicate materials. Silicate impregnant is included silane and alkali silicate(sodium and lithium silicate). Thus, this study is concerned with carbonation and chloride ion resistance of self cleaning hydrophilic impregnant of concrete structure using lithium and potassium silicate. From the experimental test result, lithium and potassium silicate have a good properties as a carbonation and chloride ion resistance. Lithium and potassium silicate make good use of hydrophilic impregnant.

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ASR Resistance of Ternary Blended Binder Adding Ultra Fine Mineral Admixture (고분말도 광물성 혼화재를 혼입한 삼성분계 결합재의 ASR 저항성 평가)

  • Jeon, Sung Il;Ahn, Sang Hyeok;An, Ji Hwan;Yun, Kyung Ku;Nam, Jeong-Hee
    • International Journal of Highway Engineering
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    • v.15 no.5
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    • pp.81-89
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    • 2013
  • PURPOSES : This study is to evaluate ASR(alkali silica reactivity) resistance of ternary blended binder adding ultra fine mineral admixture. METHODS : This study analyzes ASR expansion using ASTM C 1260 and 1567. RESULTS : This study showed that the fineness of mineral admixture had no effect on ASR expansion. The expansion of ternary blended binder(UFFA 20%+FGGBS 10%) were below 0.1%, and this binder met the ASR standard. Also when adding the CSA expansion agent, ASR expansion slightly decreased. The expansion of latex modified mixture increased by 80% comparing plain mixture. CONCLUSIONS : Ternary blended binder met the ASR standard, and this binder is available in concrete bridge deck overlay.

Cochineal natural dyeing of alkali-treated PET (II) - Color, Washfastness, Abrasion Resistance, Static Electricity Characteristics - (알칼리 감량(減量) PET의 코치닐 염색(染色) (II) - 색상(色相), 세탁견뢰도(洗濯堅牢度), 마찰견뢰도(摩擦堅牢度), 마찰대전압(摩擦帶電壓)을 중심(中心)으로 -)

  • Kim, Hyun-Su;Jeon, Dong-Won
    • Journal of Fashion Business
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    • v.9 no.5
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    • pp.122-135
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    • 2005
  • It has been reported that natural dyeing is impossible without pre-treatment with metal mordanting agents. However, pre-treatment with chitosan, which has high affinity to natural dyes, could result in an excellent dyeing with various natural dyes. In this study, three treatment methods were employed; 1) Using PET without any pre-treatment (Method 1) 2) Using PET with chitosan acid solution pre-treatment (Method 2) 3) Using PET with chitosan pre-treatment and subsequent crosslinking using citric acid (Method 3) Method 2 and 3 enhanced the Cochineal dyeability remarkably compared to Mehod 1. Washfastness was also enhanced, and moisture content, static property, abrasion resistance, and fabric hand changes were investigated.

Effect of Types of Accelerators and Replacement Levels of GGBFS on the Performance of Shotcrete Mortars (숏크리트 모르타르의 성능에 대한 급결제 종류 및 고로슬래그 미분말 대체율의 영향)

  • Lee, Seung Tae;Kim, Seong Soo;Kim, Dong Gyu;Park, Kwang Pil
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.1
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    • pp.76-84
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    • 2013
  • In this study, some engineering properties of OPC and GGBFS shotcrete mortars with alkali-free or aluminate accelerator were experimentally examined. As a result, GGBFS mortars with alkali-free accelerator were significantly similar to OPC mortars with same accelerator with respect to both setting time and compressive strength. Comparatively, GGBFS mortars with aluminate accelerator showed a good performance with an increased replacement of GGBFS. Furthermore, when replaced with GGBFS over 50%, the mortars exhibited superior performances of electrical resistivity and chloride ions penetration resistance. Accordingly, it is suggested that GGBFS has a beneficial effect as shotcreting materials in the condition of proper replacement levels.

Effects of Basicity on the Carbonation Characteristics of Alkali-Activated Slag Mortar (염기도가 알칼리 활성고로슬래그 모르타르의 탄산화에 미치는 영향)

  • Song, Keum-Il;Lee, Bang-Yeon;Hong, Geon-Ho;Gong, Min-Ho;Song, Jin-Kyu
    • Journal of the Korea Concrete Institute
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    • v.24 no.5
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    • pp.577-584
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    • 2012
  • Carbonation resistance is one of the most influencing factors on durability of concrete. Alkali activated slag (AAS) is known to have weaker resistance for carbonation than OPC due to the low calcium contents. In this paper, the carbonation characteristic of AAS mortar which is related to the basicity (CaO/$SiO_2$) was investigated. In order to give the various basicity conditions, SM (source material) was blended with quicklime (CaO) and silicon dioxide ($SiO_2$) by adopting mechano-chemical treatment method. Experiments including flow test, compressive strength test, carbonation depth test, together with XRD, FTIR and TGA were employed to evaluate the effects of basicity of SM on the carbonation characteristics. The test results showed that the carbonation resistance effectively increased with the increase of the basicity of SM.

Experimental Study on the Development and Evaluation of Lt.Wt.& High Strength Composites Utilizing By-Products and Calcium Silicates for Construction Materials(1) (산업부산물 및 규산칼슘계 재료를 이용한 건재용 경량.고강도 복합체의 개발.평가에 관한 실험적 연구(기 1))

  • 박승범
    • Magazine of the Korea Concrete Institute
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    • v.6 no.4
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    • pp.141-152
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    • 1994
  • The results of an experimental study on the development and the evaluation of lightweight and high strength composites utilizing by-products and calcium silicates for construction materials are presented in this paper. The composites using early strength portland cement, by-Products( f1y ash, silica fume), silica powder, quick lime, gypsum, A1 powder and fibers(PAN-derived CF, alkali-resistance GF) were prepared using various mixing conditions. As the test results show, PAN-derived CF and alkali-resistance GF were suitable for rein-forcing fiber of the composites. And the mechanical properties,such as compressive tensile flexural strength, and toughness of Lt. Wt. fiber reinforced calcium silicates cement comp-osites were improved by increasing the fly ash and silica fume contents, and fiber contents, especially by increasing fiber contents the toughness of the composites were remarkably in-creased. Also, compressive tensile flexural strength,and toughness of the composites rein-forcing PAN-derived CF were higher than those of the composites reinforcing alkali-resistance GF..

Sulfate Resistance of Alkali Activated Pozzolans

  • Bondar, Dali;Lynsdale, C.J.;Milestone, N.B.;Hassani, N.
    • International Journal of Concrete Structures and Materials
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    • v.9 no.2
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    • pp.145-158
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    • 2015
  • The consequence of sulfate attack on geopolymer concrete, made from an alkali activated natural pozzolan (AANP) has been studied in this paper. Changes in the compressive strength, expansion and capillary water absorption of specimens have been investigated combined with phases determination by means of X-ray diffraction. At the end of present investigation which was to evaluate the performance of natural alumina silica based geopolymer concrete in sodium and magnesium sulfate solution, the loss of compressive strength and percentage of expansion of AANP concrete was recorded up to 19.4 % and 0.074, respectively.