Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil

Sifat Fisis Tanah Lempung Ekspansif yang Disubstitusi dengan Serbuk Limbah Keramik

Ratna Dewi, Yakni Idris, Indra Chusaini San, Lien DYN, Putri Tisya R — Wed, 28 Dec 2022 09:07:32 +0700

Expansive soils have high compressibility, swelling, and shrinkage properties. So we need an effective method to improve soil conditions when the structure is built on it. This paper presents the results of research on the effect of the substitution of ceramic waste on the physical properties of the expansive soil. Soil improvement using construction waste will contribute to reducing the amount of waste and conserving natural resources. The stages of the research included testing the physical properties of both soil and waste materials, then testing the physical properties of the mixed soil which included the Atterberg limit test, soil compaction test, and SEM test. The addition of ceramic waste powder can function as a material that can chemically change the physical properties of the soil. There was a decrease in the optimum water content (w_opt) of the soil and an increase in the maximum dry density (g_d max) value of the soil along with the addition of the percentage of ceramic waste powder that was up to 1.410 gr/cm³. The percentage of chemical content (SiO₂ and Al₂O₃) in ceramic powder affects soil compaction parameters and decreases soil plasticity index, where the content of SiO₂ and Al₂O₃ in ceramic powder 1 is higher than ceramic powder 2 giving lower IP (Index Plasticity) values and optimum moisture content, respectively by 16.26 and 28%, and a higher maximum dry density value of 14.4 gr/cm³.

Simulasi Pola Operasi Waduk Batutegi, Provinsi Lampung

Dian Swastika, Dyah Ari Wulandari, Ignatius Sriyana — Wed, 31 May 2023 12:29:20 +0700

Batutegi Reservoir is a multi-purpose reservoir that is used to increase the water supply to the Argoguruh Weir to expand the irrigation area in the Sekampung Irrigation System. Batutegi Reservoir supplies the water demand not only for irrigation, covering an area of 66.573 Ha, but also for hydroelectric power generation (hydropower) of 2 x 14 MW and the raw water supply of 2.250lt/s. The operational curves of the Batutegi Reservoir were prepared in 2017, aiming to control the water release to ensure the planned demand is fulfilled. However, the reservoir operation curves must be reviewed at least once every 5 (five) years to comply with the changes in reservoir conditions and the development of its benefits/functions. The study aimed to determine the reservoir reliability by updating the reservoir operation curves in 3 conditions; wet year, normal year, and dry year using the SOR (Standart Operating Release) simulation method according to the inflow and outflow during the mid-month period. Results showed that in the wet year, normal year, and dry year, the reservoir reliability in supplying water for irrigation, raw water, and hydropower is satisfactory in each period. In conclusion, although some simulation periods showed the final RSL (Reservoir Water Levels) of the reservoir are below the upper limit of the operation curves, they are still above MOL (Minimum Operation Level) hydropower level meaning all supply for irrigation, raw water, and hydropower can be 100% fulfilled.