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All Journal Jurnal Teknik Sipil Journal of Science Education Research
Syahril, S.
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Civil Engineering, Building, Construction & Architecture Education Social Sciences

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Application of the CIRC Model to Improve Learning Outcomes on Solar System Material in Class VII of SMPN 4 Tambang Sa'adah, Y. Z.; Syahril, S.; Fakhruddin, Z.
Journal of Science Education Research Vol. 8 No. 1 (2024): J. Sc. Edu. Research
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jser.v8i1.65656

Abstract

The research aims to improve students' cognitive learning outcomes on Solar System material in the experimental class with the CIRC learning model and the control class with conventional learning. The research was conducted in May-June, the Even Semester of the 2022/2023 Academic Year at SMPN 4 Tambang, Tambang District, Kampar Regency, Riau Province. The population was all students of class VII which consisted of 10 classes and 315 students. The sample was selected using a purposive sampling technique. Class VII-B was selected as the experimental class and VII-C as the control class. The research was Quasi-Experimental with a posttest-only, Non-equivalent Control Design. The research showed that the posttest score in the experimental class was higher with a mean score of 77.9 in the category of good (B). Meanwhile, the control class obtained a score of 68.5 in the sufficient category (C). Inferential analysis with SPSS 25 was used to test the normality, homogeneity, and hypothesis. The normality and homogeneity tests showed the distribution of the both two classes were normal and homogeneous. Based on the hypothesis test with the Independent Sample T-test, a significance of 0.001 was obtained that there has been a significant increase in students' cognitive learning outcomes through the application of the CIRC model on the Solar System material in class VII of SMPN 4 Tambang.
Stabilisasi Tanah Lunak Menggunakan Lumpur Bledug Kuwu dan Larutan Asam Fosfat Ditinjau Dari Nilai Kuat Tekan Bebas Winarno, Arief Budi; Syahril, S.
Jurnal Teknik Sipil Vol 31 No 2 (2024): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.2.14

Abstract

Abstract Soft soils with low bearing capacity are a major problem in construction that can lead to failures, such as road damage, building tilts, and bridge collapses. This research aims to improve the bearing capacity of soft soil in Gedebage, Bandung, using a soil stabilization method with Bledug Kuwu mud (LBK) and phosphoric acid solution (LAF). Bledug Kuwu mud was selected due to its chemical composition, which is similar to fly ash and volcanic ash, particularly in terms of SiO₂, Al₂O₃, and Fe₂O₃ content. Phosphoric acid, though rarely used in construction, was chosen for its potential as an effective soil stabilizing agent. The research methodology involved collecting native soil samples from Gedebage and conducting physical and mechanical property tests at the Geotechnical Laboratory of Bandung State Polytechnic. The test results indicated that the optimum mixture of 15% LBK and 10% LAF successfully reduced the soil's Plasticity Index (PI) by 73.91%, from 46% to 12%. In addition, the unconfined compressive strength (qu) increased by 35% compared to the native soil, with a qu value of 1.02 kg/cm² and cohesion (c) of 0.51 kg/cm², indicating an improvement in soil consistency to the "stiff" category. These results demonstrate that the combination of LBK and LAF effectively enhances the bearing capacity of soft soils, offering an innovative solution for subgrade soil improvement and supporting the development of higher-quality infrastructure in Indonesia.
Co-Authors Fakhruddin, Z. Sa'adah, Y. Z. Winarno, Arief Budi