Author/EditorSITI, HANGGITARACHMAWATI RACHMAWATI
Alternative Title廃棄貝殻を用いた環境保全型地盤改良技術に関する研究
Note (General)application/pdf
Every year huge amount of Seashell-By -Products (SBP) are produced in all over the world. According to the Japanese Ministry of Forestry, Fisheries and Agriculture, total amount of abandon shell husk is about 151,000 tons/year which generated of industry and household consumption. It nearly 32 million US$nearly are being used for disposal cost which still unexpected event for developed country like Japan. In developing country, illegal dumping is most common way to treat this waste due to a high cost of waste treatment. In a certain time, if this waste is untreated, the air pollution and other environmental problems are occurred. It is because abandon shell husk without properly treatment becoming a source of unpleasant smells due to either the decay of remnant flesh attached to oyster shells or microbial decomposition of salts into gases such as NH3,H2S and amine . The development of technologies that using abandoned shell husk are needed according to the consequences for human being.In the present study, the abandon shell husks are being used as the recycle aggregate in ground improvement technique . Recycling aggregate utilization has advantage to protect limited resources of natural aggregates, increasing the abandon waste value and problem solving of waste storage. Ground improvement techniques are contributed to increase the soil strength and performance under the load, also reducing compressibility of soil. These techniques are often used to improve the properties of soil in terms of their bearing capacity, shear strength, settlement characteristic and drainage that widely used in a large scope of construction such as industrial, commercial, housing projects and infrastructure construction for dams, tunnels, ports, roadways and embankments. There are many different types of ground improvement techniques, which can be tailored to the natural condition of soil and economical aspect in order to achieve its effectiveness and efficiency. Recently recycle aggregate has recently been used in all over the world to reduce project budget and protect environment.The shell husk has potency as recycle aggregate due to composition which consist of mainly 95-99% (by weight) of CaCO3 that potentially convert to CaO for reinforcing the soil or binding material. Furthermore, the utilize of shell husk are purposed to improve agriculture land which need light weight material. Effective ground improvement technique is normally needed in improving agriculture land condition. This is to accommodate agriculture activities which have operational loadings due to tractor or rice transplanter. To enhance the soil-shell husk material properties , then shell husks are mixed with cement. Cement is a soil stabilizing agents which used widely, due to its quick process. It does not need mellowing time and provides a non -leaching platform to stabilize soils. Application soil-cement with nominal dosage of cement also has significant contribution to environment and it is cost-effectiveness. In Japan, many terrace land uses cement treated soil to prepare new cultivation paddy fields from unused land. Then, to evaluate this concept, in this study was prepared several specimens which are control (only soil), soil-shell husk, soil-cement, soil-cement-shell husk. Specimen which has cement percentages was cured for seven days before laboratory testing. The laboratory testings are included direct shear test, CBR (California Bearing Ratio), UCS (Unconfined Compressive Strength), triaxial test. In this study, the properties of soil and shell husk also had been clarified. The parameters were shear strength , angle of internal friction (φ),cohesion (c), dilatancy behavior, bearing capacity, stress, strain, stress, moduli deformation, axial strain (ℇa) , and principal stress difference (σa-σr) . Result of the direct shear test showed that both the and angle of internal friction cohesion of the soil-shell husk specimen shell husk specimen increased by increasing of shell husk percentage . It also was observed that there is a decrease in the dilatancy behavior of soil which mixed with shell as compared to control specimens indicating ground improvement. From this testing was found the shear strength of soil increased by increasing the shell husk-cement percentage. The CBR results showed that the addition of shell husk in soil leads to improvement in the CBR values of the ground as compared to control specimens. It was further revealed that by increasing the percentage of shell husk in the soil-shell husk mixture, the CBR value was improved significantly. The addition of shell husk and cement increased the CBR value of all types of subbase layers. From UCS testing was observed that increasing of shell husk and cement percentage, increased the compressive strength of the soil. There was very little variation in the estimation of the moduli deformation for testing results. The triaxial test obtained that combination of shell husk and cement addition increase the shear strength than specimen which using shell husk and cement separately. The outcome of this research indicated that shell husk has capability as the recycle aggregate in ground improvement technique. Moreover, combination of shell husk-cement are expected to improve agricultural earth structures.
本文 / GRADUATE SCHOOL OF BIORESOURCES MIE UNIVERSITY
121p
Collection (particular)国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
Date Accepted (W3CDTF)2018-12-03T16:15:19+09:00
Data Provider (Database)国立国会図書館 : 国立国会図書館デジタルコレクション