http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 安龍得 (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
安龍得,姜信葉 충남대학교 농업과학연구소 1985 農業技術硏究報告 Vol.12 No.2
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±5mm, 28% by flow 240±5mm and 32% by flow 280±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.
-
姜信業,金成完,安龍得 충남대학교 농업과학연구소 1982 農業技術硏究報告 Vol.9 No.-
This study was carried out to find the effects of foaming agents, mixingtime and particle size of fine aggregate on the formation of porosity in mortar and on the physical properties of the foaming-agent containing mo:tar such as compressive strength, tensile strength, moisture absorption rate, etc. For this purpose, the air contents were measured when the dosage of foaming agent and the particle size of fine aggregate were varied as shown in 1-4 of Table 7. The compressive strength and the tensile strength were also measured for σ7 and σ28 at the variations of proportion of foaming agent between 0.25 and 1.25 percent (assuming the total weight of cement) with the cement and sand ratio of 1:1, 1:2, 1:3 and 1:4. The moisutre absorption rates were measured with the samples dipped in water for 30 minutes, 1 hours, 3 hours, 24 hours and 72 hours, respectively. The results of these tests were summarized as follows: 1. In any specific mixture, larger foaming agent and longer mixing time resulted in increase of porosity and gradual decrease of the flow value and specifity gravity. The flow value showed the maximum around 30 seconds of the mixing time and a sharp increase of pores was seen around two minutes. When the particle diameters of fine aggregate were larger, the bubble formation was increased, but above 1.2 mm of the particle diameters, a material segregation segregation phenomenon appeared. 2. In porous mortar, low compressive strength and low tensile strength was inevitable due to its porosity. There was relationship between specific gravity and air contents. Lower specific gracity and greater air content were accompanied by low levels of those two strengths. The 28-days compressive strength was 1.72 times the 7-days compressive strength, while the 28-days tensile strength showed to be 1/10-1/16 times the 28-days compressive strength. 3. The moisture absorption rate of the porous mortar was very high because of the inherent high porosity of such concrete material. the larger the foaming agent with poorer cement content, the greater the moisture absorption rate. With none of foaming agent added, the absolute absorption rate was small, but the increasing rate of absorption with time passing was of considerable magnitude. When the foaming agent was added,the moisture absorption rates was most brisk around the end of the first 30 minutes.
-
-
민경주(Min Kyung-Joo),심현우(Shim Hyun-Woo),안용득(An Yong-Deuk) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
To the installed CWR (Continuously Welded Rail) on steel plate girder bridges without ballast, shoes were replaced by the shoe for reduced axial force. During 9 months, from summer to winter, expansion by a temperature on girders, axial forces by a temperature on CWR, etc. are tested and the results are evaluated. Also, with the numerical analysis, the results - axial forces by a temperature on CWR, deformations of girders, etc. are compared and evaluated. From the longitudinal displacement on girders, occurred by run of trains, because of looking for the stability, the bearings for reducing axial forces are applied to the railway bridges. It is verified that the bearings for reducing axial forces disperse the axial forces by a temperature from the measurement of the forces on CWR of plate girder bridges,.
RISS
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
