• Title/Summary/Keyword: 시멘트모르터

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A Study on te Water Diffusion of Polymer-Modified Mortars in Drying Process (건조과정에 있어서 폴리머 시멘트 모르터의 수분확산에 관한 연구)

  • 조영국;소양섭
    • Magazine of the Korea Concrete Institute
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    • v.8 no.5
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    • pp.135-143
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    • 1996
  • Diffusion of water in hardened cement concrete and mortar influences on the dry shrinkage. creep. modulus of' elasticity, etc. In general, water loss through drying process in polymer-modified concrete and mortar is small compared with that of unmodified concrete and mortar due to the films formed by polymer as cement modifieder. The purpose of this study is to investigate the diffusion process of water in the polymer-modified mortars. The polymer-modified mortars using three polymer dispersions and epoxy resin are prepared with various polymer-cement ratios, and water diffusion coefficient of polymer-modified mortars according to inside water content is calculated. From the test results, the water diffusion coefficient of polymer modified mortars i s smaller than that of unmodified mortars and decreases with increasing polymer cement ratio.

Mechanical Properties of Epoxy-Modified Mortars and Concretes without Hardener (경화제 무첨가 에폭시 시멘트 모르터 및 콘크리트의 역학적 성질)

  • 조영국;소양섭
    • Magazine of the Korea Concrete Institute
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    • v.8 no.3
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    • pp.157-165
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    • 1996
  • The purpose of this study is to develop the epoxy-modified mortars and concretes without hardener having a good balance between performance and cost. In this study, the epoxy-modified and concretes without and with the hardener are prepared with various polymer-cement ratios, and tested for the mechanical properties of the epoxy-modified mortars and concretes without and with the hardener. From the test results, the epoxy-modified mortars and concretes without the hardener having an excellent mechanical properties are developed at low polymer-cement ratios of 10 to 20% compared with those of conventional epoxy-modified mortars and concretes with the hardener.

Effect of Inorganic Pigments on the Workability of Cement Mortars (무기안료가 시멘트모르터의 유동성 미치는 영향)

  • Lee Jae-Yong;Go Seong-Seok;Lee Hyun-Soo
    • Korean Journal of Construction Engineering and Management
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    • v.1 no.2 s.2
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    • pp.63-70
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    • 2000
  • Since inorganic pigment, among admixtures used for cement composites, can raise the esthetic value of a building due to its effect of coloring, it can be assumed that the quantity consumed is expected to increase in connection with the recent trend of emphasizing the beautiful sights of the city. We carried out a flow test by changing the mix proportion of the cement mortar mixed with an inorganic pigment, water-cement ratio and pigment mixing ratio in order to present the basic materials for utilizing colored cement mortars. In construction by exploring the effect of inorganic pigments on the workability of cement mortar. In case of red pigment mortar and yellow pigment mortar, the workability was found to be rapidly decreased. To secure proper workability, it is necessary to increase the amount of mixing water, or to use superplasticizer. In case of green pigment mortar, however, it recorded $-2.4{\~}6.9{\%}$, showing that there was almost no change in flow. In case of black pigment mortar, it was also confirmed that there is no need to consider workability.

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A Study on the Dry Shrinkage and Moisture Diffusion Coefficient of Polymer-Modified Mortars by the Moisture Diffusion (수분확산에 의한 폴리머 시멘트 모르터의 건조수축과 확산계수에 관한 연구)

  • 조영국;소양섭
    • Magazine of the Korea Concrete Institute
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    • v.8 no.5
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    • pp.145-154
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    • 1996
  • Polymer-modified mortars have an excellent water proofness and water retentivity. Therefore, the study on the moisture diffusion behavior- is very important. The purpose of' this study is to investigate the effects of relative humidity and moisture content in mortars on the moisture diffusion, and the relationship between the shrinkage and moisture diffusion coefficient of polymer-modified mortars cured at $20{\circ}C$ 50% R.H and 80% R.H. The pore size distribution of the polymer-modified mortars was also measured. From the test results, the relative humidity and moisture content in mortars influenced on the moisture diffusion of polymer-modified mortars. The shrinkage and moisture diffusion coefficient of polymer-modified mortars cured at $20{\circ}C$ 50% R.H. was bigger than that cured at $20{\circ}C$ 80% R.H.. and decreased with increasing polymer-cement ratio regardless of polymer type.

A Study on the Plastic Shrinkage Properties of Cement Mortars (시멘트 모르터의 소성수축 특성에 관한 연구)

  • 이의학;김범수;송영진;송명신;이경희;박한수
    • Journal of the Korean Ceramic Society
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    • v.38 no.8
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    • pp.716-723
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    • 2001
  • 시멘트 모르터의 소성수축에 의한 균열을 방지하기 위해 소성수축 특성에 관한 연구를 수행하였다. 우리나라 봄철의 대표적인 기후인 온도 20$\pm$3$^{\circ}C$, 상대습도 55%, 풍속 3.5m/s의 기후조건으로 하였으며, 모르터의 물 시멘트 비, 시멘트 골재 비, 팽창재 사용, 플라이 애쉬 치환, 수분증발을 억제하기 위한 중점제 등을 사용하여 소성수축의 특성을 검토하였다. 연구 결과 소성수축 변형은 응결시간과 밀접한 관계가 있으며 응결시간이 빠를수록 변형은 크게 나타났다. 또한 물시멘트 비에 의해서도 소성수축 변형은 큰 것으로 나타났다. 모르터에서의 골재 비율이 작거나, 플라이 애쉬의 치환율이 클수록 소성수축 변형은 매우 크게 나타났다. 중점제의 사용은 소성수축 변형을 줄이는데 효과가 있었으며, 건조수축 보상용 팽창재의 사용은 소성수축 변형율을 크게 하는데 이는 ettringite 생성에 의한 물 시멘트 비의 감소효과를 가져오기 때문이다.

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A Study on Chemical Resistance of Cement Mortar Blended with Thermally Activated Diatomite containing Heavy Metals form EAF Dust (EAF Dust사의 중금속을 함침한 활성 규조토가 혼합된 시멘트 모르터의 내화학성에 관한 연구)

  • 류한길;임남웅;박종옥
    • Magazine of the Korea Concrete Institute
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    • v.9 no.1
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    • pp.143-151
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    • 1997
  • Chemical resistance of the cement mortar containing the Thermally Activated Diaomite(TAD) and H.M.(Heavy Metals) has been studied. The H.M.. extracted from EAF(Electrica1 Arc Furnace) Dust. were saturated with diatomite. The diatomite was then thermally activated at $750{\circ}C$ for 30minutes and powdeled. The powder was mixed with a portland cement on a weight basis from 0%. 2.5%. 5.0%. 10%. 20%. The optimum mixture. after those mixtures were subjected to compressive strength(7 and 28days) and leaching bchaviour of H.M.. was tested for its experiment on Wet/Dry cycles and chemical resistance(e.q. imrncrsion in 5%(Conc.) of H2S04, CaC12 and hlgSO4. It was shown that the cement, mortar containing 10% of' P.D. gave a rise to the remarkable increase in compressive strength. The compressive strength was generally decrease beyond the addition of 10% of P.D. The maximum $496kgf/cm^2$ of 28days compressive strength was acheiveti when 10% of P.D. was added to the cement mortar.

Studies on Influence of Water-Proof Agents on the Properties of Mortar (방수제(防水劑)가 모르터의 제성질(諸性質)에 미치는 영향(影響)에 관(關)한 연구(硏究))

  • Kim, Seong Wan;Sung, Chan Yong;Kim, Sun Young
    • Korean Journal of Agricultural Science
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    • v.14 no.2
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    • pp.358-372
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    • 1987
  • This study was performed to obtain data which can be applied to use of water-proof mortars. The data was based on the properties of water-proof mortars depending upon various mixing ratios to compare those of cement mortar. The water-proof agents used were retard and accelerate type which are being used as mortar structures. The water-proof agents, mixing ratios of cement to fine aggregate were 1:1, 1:2, 1:3 and 1:4. The results obtained were summarised as follows; 1. The results of flow test, water-cement ratio was increased with the increasing of mixing ratio. 2. The permeability were increased in poorer mixing ratio and higher water pressure. 3. The bulk density was decreased with the increasing of mixing ratio, and compressive and tensile strength were increased with increasing of the bulk density. 4. At 1:1 mixing ratio, the highest strengths were showed and strengths were decreased with the increasing of mixing ratio. 5. The absorption rates were increased in- poorer mixing ratio 6. The correlation between W/C, permeability, bulk density, compressive strength and absorption rate were highly significant as a straight line, respectively.

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Experimental Studies on the Properties of Mortars by Foaming Agent (기포제(起泡劑)를 사용(使用)한 모르터의 제성질(諸性質)에 관(關)한 실험적(實驗的) 연구(硏究))

  • Ahn, Young Durg;Kang, Sin Up
    • Korean Journal of Agricultural Science
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    • v.12 no.2
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    • pp.292-308
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    • 1985
  • This study was performed to obtain the basic data which can be applied to the use of foamed mortars using foaming agent of prefoamed type. The data was based on the properties of foamed mortars depending upon various mixing ratios of cement to fine aggregates, flow values and foam-cement ratio to compare those of cement mortar. The results obtained were summarized as follow; 1. At the mixing ratio of 1:0 and the foam-cement ratio of 6.00%, the increasing rate of water-cement ratio was 25% by flow $200{\pm}5mm$, 28% by flow $240{\pm}5mm$ and 32% by flow $280{\pm}5mm$. But it decreased as the mixing ratio gets poorer. The result showed that water amount increased because of the high viscosity caused by the increase of foam-cement ratio. The decrease of water-cement ratio was the greatest when the foam-cement ratio was 1.50%. 2. Absolute aridity bulk density of foamed mortars decreased with the increase of foam-cement ratio and the decrease of flow values. 3. Generally, compressive, tensile and bending strenghs of foamed mortars decreased with the decrease of flow values and the increase of foam-cement ratio. 4. The compressive strength was in proportion to tensile strength. It was estimated that the compressive strength was 8.8 times of tensile strength. The compressive strength was in proportion to bending strength. It was estimated that the compressive strength was 4.0 times of bending strength. The bending strength was in proportion to tensile strength. It was estimated that the bending strength was 2.1 times of tensile strength. 5. At the mixing ratio of 1:1 the lowest absorption rates were showed by foamed mortars, respectively. It was significantly higher at the early stage of immersed water.

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A Study on the Fundamental Properties of Cement Mortar Using Polymer Coated Crumb Rubber (폴리머 코팅 폐타이어 분말을 혼입한 시멘트 모르터의 기초적 성질)

  • Song, Hun;Jo, Young-Kug;Soh, Yang-Seob
    • Magazine of the Korea Concrete Institute
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    • v.8 no.6
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    • pp.163-172
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    • 1996
  • Recently, the disposal of used vehicle tires is a big social problem because the amount of used vehicle tires has been increased with development of' automobile industry. Many researches have been made on the recycling of used vehicle tires in the various fields of industry as well as construction industry. When the crumb rubber made of vehicle tires is mixed in cement concrete and mortar, it is indicated that the adhesive strength of interface between the crumb rubber and cement hydrates is very low. The purpose of this study is to improve the fundamental properties by increasing of the adhesion strength of styrene-butadiene rubber(SF3R) latex coated crumb rubber in ; cement mortar. SBR-modified mortar using crumb rubber is also tested as the same method. From the test results, the cement mortar using SBR latex coated crumb rubber have a good fundamental properties compared with that using uncoated crumb rubber. The mechanical properties of SBR-modified mortar using crumb rubber with polymer-cement ratios of 10% are also improved.