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저소성(低塑性) 실트질(質)흙의 흙 시멘트에 관(關)한 연구(硏究)
김주범 ( Kim Joo Bum ),박완순 ( Park Wan Soon ),류기송 ( Ryu Ki Song ),김성교 ( Kim Seong Gyo ) 한국농공학회 1975 韓國農工學會誌 : 전원과 자원 Vol.17 No.2
The objective of this study is to determine an appropriate cement of soil-cement in which silty soil of salty tidal flat with low plasticity was used. Physical, chemical and mechanical tests were conducted to find out the standard properties of the soil to be used. Various cement contents used in this test were 8%, 10%, 12%, and 14%, and the compressive strength was tested after 7 days and 28 days of standard curing in the above each cement content respectively. The results obtaind are summarized as follows. 1. As the cement content was increased from 8% to 14%, Maximum dry density (M.D.D.) and optimum moisture content (O.M.C.) were not changed remarkably. 2. Density of soil-cement was directly proportional to cement content and inversely proportional to water content. 3. OMC was generally decreased in proportion to the increase of cement content. 4. Compressive stranth was directly proportional to centent and inversely proportional to water content. 5. In freezing and thawing test, maximum loss of 10% in the total Weight was found on the 8% cement mixture. and This loss was rapidly decreased to 2% when the Cement content of the mixture was more than 10%.
김주범 ( Joo Bum Kim ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.3
This is summary of an article “Soil Engineering” in the Definite Report, Irrigation Project in Go-Cong Delta, Vietnam, worked by the Agricultural Development Corperation, Korea. 1. For the results of in-place aud loboratory investiga-tion, Earth foundation in the Go-Cong Delta Project were class-ified for cohesive soils of high or low compressibility (CH or CL), and the typical balues of cone penetration registance, which were carried out using the Dutch type deep sounding app-aratus, indicated 2.5kg/㎠ in the area while the range from 50 to 120kg/㎠ were found in some areas. 2. The curves of the field cone penetrati on test balues, were plotted in the shape of irregular small waves, meant that the waver in the area composed of fine and coarse grains strata alternately. The strata were easily observed by naked eye. 3 The moisture contents in-place varied in wide range; from the typical value for 50% to maximum value for 80%. 4. The field density was also various showing balues range from 1.5t/㎥ to 2.0t/㎥ but Keeping typical balue as 1.6t/㎥ in th area. Low density layers, which were found in remote zone from river beds, were the accumulation of sediment that was made by organic colloidal clay particles in float suspension load. 5. Typical balue of shear strength being obtained from undraned triaxial compression tests with measurement of pore water pressure was 7 in angle of internal friction(ø) n ad 1.5t/㎡ in cohesion(C). 6. Shearing strength of foundation in the site of My-Tho upstream pumping station and the site of Cho-Cao syphon concisting of sandy soil layer had 30° of ø Therefor, they were assumed to have sufficient bearing capacity. On the contrary, extreme care should be taken when heavily weighed structures would be built on weak foundation in Vam-Co River vicinity.
액성한계시험(液性限界試驗)의 표준법(標準法)과 일점법(一點法)과의 비교연구(比較硏究)
김주범 ( Joo Bum Kim ) 한국농공학회 1973 韓國農工學會誌 : 전원과 자원 Vol.15 No.4
Although standard method of test for liquid limit procedure is issued under the fixed designation KSF-2303 in 1968, for both of general method and on point method, the latter of which is not still favorably used among laboratory engineers with its defficiency of adquate informations. This study intended as to furnish proper information to the laboratory engineers for the use of one point liquid limit test with full advantages of time-saving and labor-saving. further more, the following conversion formula to the one point method VS. general method is presented by the results of analytical study on 1017 Soil sampls existing liquid limit test data The formula is; The conversion factor (table-4) is also attached for the convenience of the users.
김주범 ( Joo Bum Kim ) 한국농공학회 1974 韓國農工學會誌 : 전원과 자원 Vol.16 No.4
Alluvial plain of the coast of Kum river tail were found as being mostly consisted of weak foundation. The settlement of the ground, density and change of moisture content which were formed by the load due the construction of earth works were disclossed by the field investigations and laboratory tests. The results are as follow, 1) Banking materials are SM and soft soil stratum is CL. 2) Field moisture content; Wf=19-1.37c c; percentage of clay (less than 0.005mm) 3) optimum water content and maximum density of banking materials; rt=2.15 | 0.0165W(12%< W >24%) 4) Density and moisture coutent of banking materials; rt=2.146-0.0095W (8%< W >50%) 5) Density and moisture content of weak foundation; rt=2.06-0. 007W After construction (20%< W >50%) Befor construction (40%< W >60%) 6) Load and settlement of weak foundation; Everage settlement ratio; 12% of actual load p Maximum settlement ratio; 19% of actual load p Minimum settlement ratio: 5% of actual load p 7) Relation of cohesion and unconfined compression test value; c=1/2qu (qu< 0.5kg/㎠) c=1/3qu (qu >0.5kg/㎠)
축제용(築堤用) 흙의 밀도변화(密度變化)에 의(依)한 투수계수(透水係數)에 관(關)한 연구(硏究)
윤충섭 ( Choong Sup Yoon ),김주범 ( Joo Bum Kim ) 한국농공학회 1973 韓國農工學會誌 : 전원과 자원 Vol.15 No.1
The density of soil is one of the most important of its engineering properties, and many soil-engineering operations directed toward improving the density characteristics of matecal. This report is a study on relationship between density, permiabilty and other physical properties of compacted soil in various desity grades. The results of the study can be summariged as follow: 1. The optimum moisture content of soil increses with increasing of fine particles and a relationship between both parameter is w<sub>ο</sub>=0.1765.n Where, n is passing percentage from #200 sieve. 2. The porosity of soil increases with increasing of optimum water content as e=aw<sub>ο</sub>+b without having relation to compaction ratio. 3. The increment of permeability of soil is high when the compaction ratio is increased and the phenomenon is conspicuous in case of course soil and non-plastic soil. 4. The permeability of soil decreases with increasing of optrimum water content and the phenomenon is conspicuous when compaction ratio decreases. And the permeability is almost constant when optimum water content is more than 25 percent, even though compaction ratio changes. 5. The permeablity of soil increanses when the amount of fine particles is very few, the permeability is almost constant as being impervious condition without having relation to compaction ratio when there in more than 90 percent of fine particles (less than #200 sieve).