scholarly journals PEMBELAJARAN KUAT GESER DAN KUAT TEKAN PADA TANAH LEMPUNG BERBASIS PRAKTIKUM

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Suhairiani . ◽  
Nahesson H Panjaitan ◽  
Hamidun Batubara
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Soil Mass ◽  
Internal Resistance ◽  
Resistance Force ◽  
Ability Test ◽  
Cognitive Improvement ◽  
The Subject ◽  
Strongly Agree ◽  
Student Observation

Kekuatan geser dan kuat tekan tanah adalah ilmu gaya perlawanan internal yang bekerja per satuan massa tanah untuk menahan keruntuhan sepanjang bidang yang runtuh dalam periode tanah dimana perlu diketahui kekuatan kekuatan geser dan kekuatan tekan pada tanah liat Namun, banyak siswa belum selesai mempelajarinya. Berbagai upaya dalam meningkatkan penguasaan materi, yaitu melalui metode praktis yang dirancang oleh mahasiswa untuk mengembangkan dan meningkatkan aktivitas belajar dalam memahami materi pelajaran dan keterampilan dasar untuk meningkatkan kemampuan eksperimental, terutama dengan menggunakan alat. Jenis penelitian yang digunakan adalah penelitian eksperimental dengan metode kuantitatif dengan desain penelitian kelompok pretest dan posttest. Instrumen yang digunakan adalah tes kemampuan kognitif, lembar observasi siswa dan dosen dan kuesioner. Hasil penelitian menunjukkan bahwa peningkatan kognitif mahasiswa sebesar 84.24% dan peningkatan psikomotor mahasiswa dengan kriteria sangat baik adalah 57,68% dan rata-rata respon mahasiswa sangat setuju dengan penerapan pembelajaran berbasis praktek. sekitar 88%. Sehingga penerapan pembelajaran berbasis praktikum dapat digunakan untuk berbagai jenis kasus pertanahan yang ada terutama untuk pengujian yang berkaitan dengan kekuatan geser dan kuat tekan pada tanah liat Kata Kunci : tanah liat, kekuatan tekan, kekuatan geser, praktikum  ABSTRACT The shear strength and compressive strength of the soil is the science of the internal resistance force acting per unit of soil mass to withstand collapse along the crumbling plane in the soil period for which it is necessary to know the strength of shear strength and compressive strength on the clay soil. However, many students have not finished in studying it. Various efforts in improving the mastery of the material, namely through practical methods designed by students to develop and improve learning activities in understanding the subject matter and basic skills to improve experimental skills, especially using tools. The type of research used is experimental research with quantitative method with pretest and posttest group research design. The instruments used are cognitive ability test, student observation sheet and lecturer and questionnaire. The results showed that students' cognitive improvement of 83.79% and psychomotor improvement of students with a very good criterion was 57.68% and the average response of students strongly agree with the application of practice-based learning. about 88%. So that the application of practicum-based learning can be used for various types of land cases that exist especially for testing related to shear strength and compressive strength on clay. Keywords: clay, compressive strength, practicum, shear strength

scholarly journals Mechanical Properties and Micro Mechanism of Nano-Clay-Modified Soil Cement Reinforced by Recycled Sand

2021 ◽  
Vol 13 (14) ◽  
pp. 7758
Author(s):  
Biao Qian ◽  
Wenjie Yu ◽  
Beifeng Lv ◽  
Haibo Kang ◽  
Longxin Shu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Void Ratio ◽  
Soil Mass ◽  
Direct Shear ◽  
Test Results ◽  
The Sustainable Development ◽  
Direct Shear Tests ◽  
Soil Cement ◽  
Nano Clay ◽  
New Material

To observe the effect of recycled sand and nano-clay on the improvement of the early strength of soil-cement (7d), 0%, 10%, 15% and 20% recycled sand were added. While maintaining a fixed moisture content of 30%, the ratios of each material are specified in terms of soil mass percentage. The shear strength of CSR (recycled sand blended soil-cement) was investigated by direct shear test and four groups of specimens (CSR-1, CSR-2, CSR-3 and CSR-4) were obtained. In addition, 8% nano-clay was added to four CSR groups to obtain the four groups of CSRN-1, CSRN-2, CSRN-3 and CSRN-4 (soil-cement mixed with recycled sand and nano-clay), which were also subjected to direct shear tests. A detailed analysis of the modification mechanism of soil-cement by recycled sand and nano-clay was carried out in combination with scanning electron microscopy (SEM) and IPP (ImagePro-Plus) software. The test results showed that: (1) CSR-3 has the highest shear strength due to the “concrete-like” effect of the incorporation of recycled sand. With the addition of 8% nano-clay, the overall shear strength of the cement was improved, with CSRN-2 having the best shear strength, thanks to the filling effect of the nano-clay and its high volcanic ash content. (2) When recycled sand and nano-clay were added to soil-cement, the improvement in shear strength was manifested in a more reasonable macroscopic internal structure distribution of soil-cement. (3) SEM test results showed that the shear strength was negatively correlated with the void ratio of its microstructure. The smaller the void ratio, the greater the shear strength. This shows that the use of reclaimed sand can improve the sustainable development of the environment, and at the same time, the new material of nano-clay has potential application value.

scholarly journals IX. The electric conductivity of nitric acid

1898 ◽  
Vol 191 ◽  
pp. 365-398 ◽  
Keyword(s):  
Nitric Acid ◽  
Physical Properties ◽  
Nitrous Acid ◽  
Internal Resistance ◽  
The Other ◽  
Reasonable Degree ◽  
Mineral Acids ◽  
Artificial Illumination ◽  
The Subject ◽  
Deep Green

Of the commoner mineral acids the chemical changes of Nitric Acid, from their evident complexity, have formed the subject of numerous memoirs, while those of sulphuric acid, from their assumed simplicity, have been to some degree neglected; on the other hand, the physical properties of the latter have been studied with considerable elaboration, while those of the former have been passed over, doubtless on account of the corrosive nature of the acid and the difficulty of preparing and preserving it in a reasonable degree of purity. Further, with certain exceptions, the alterations in physical properties induced by the products of reduction, be they nitrogen peroxide or nitrous acid, either singly or conjointly, have attracted but little attention, though it is a common matter of observation that the current intensity of a Grove’s or other cell containing nitric acid remains constant, even though the fuming acid, originally colourless or red, has become of a deep green tint. It is more than probable that of the factors of Ohm’s law, both the E. M. F. and internal resistance are continually varying. At the earliest stages of the enquiry it was found that the passage of a few bubbles of nitric oxide gas into a considerable volume of nitric acid produced an alteration of one percent, in the resistance, and the same result could be effected to a less degree by exposure to sunlight, and to a still less degree by exposure to artificial illumination. Therefore, we determined to investigate the alterations of conductivity produced by changes of concentration and temperature in samples of acid purified with necessary precautions, more especially as former workers upon the subject have either used samples of acid confessedly impure, or have been silent as to any method of purification, or have adopted no special care in dealing with a substance so susceptible of polarisation.

scholarly journals Production of ceramics from coal fly ash

2012 ◽  
Vol 18 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Biljana Angjusheva ◽  
Emilija Fidancevska ◽  
Vojo Jovanov
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Solid State ◽  
Liquid Phase ◽  
Bending Strength ◽  
Coal Fly Ash ◽  
Liquid Phase Sintering ◽  
Heating Rates ◽  
Republic Of Macedonia ◽  
The Subject

Dense ceramics are produced from fly ash from REK Bitola, Republic of Macedonia. Four types of fly ash from electro filters and one from the collected zone with particles < 0.063 mm were the subject of this research. Consolidation was achieved by pressing (P= 133 MPa) and sintering (950, 1000, 1050 and 11000C and heating rates of 3 and 100/min). Densification was realized by liquid phase sintering and solid state reaction where diopside [Ca(Mg,Al)(Si,Al)2O6] was formed. Ceramics with optimal properties (porosity 2.96?0.5%, bending strength - 47.01?2 MPa, compressive strength - 170 ?5 MPa) was produced at 1100?C using the heating rate of 10?C/min.

Selected Properties of Parallel Strand Lumber Made from Southern Pine and Yellow-Poplar

Holzforschung ◽  
2003 ◽  
Vol 57 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Y. Liu ◽  
A.W.C. Lee
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Specific Gravity ◽  
Moisture Content ◽  
Dimensional Stability ◽  
Modulus Of Rupture ◽  
Southern Pine ◽  
Yellow Poplar ◽  
Average Modulus ◽  
Parallel Strand Lumber

Summary This study was conducted to explore basic physical and mechanical properties of parallel strand lumber (PSL) made exclusively from southern pine and yellow-poplar, respectively, and to examine their relationships using statistical analysis. Small specimens were prepared from commercial southern pine PSL and yellow-poplar PSL billets and tested for specific gravity, moisture content, dimensional stability, bending properties, shear strength and compressive strength. Results indicate average specific gravity of southern pine PSL is higher than that of yellow-poplar PSL, while their average moisture content and dimensional stability are very similar. Southern pine PSL has higher average modulus of elasticity but lower average modulus of rupture than yellow-poplar PSL. While average longitudinal shear strength does not exhibit differences between southern pine PSL and yellow-poplar PSL, average compressive strength of southern pine PSL is higher than that of yellow-poplar PSL. There are positive correlations among modulus of elasticity, modulus of rupture and specific gravity. PSL improves some properties of solid wood from which PSL is made.

Reading, Encoding, Annotating, and Pondering Technique As Learning Process In Pandemic Era to Improve Reading Comprehension Stability or Students

2021 ◽  
Vol 2 (1) ◽  
pp. 47-58
Author(s):  
Ferri Susanto
Keyword(s):  
Reading Comprehension ◽  
Learning Process ◽  
Qualitative Method ◽  
The Internet ◽  
School Based ◽  
Comprehension Ability ◽  
Field Notes ◽  
The Subject ◽  
Student Observation ◽  
Reading Comprehension Ability

The students' reading comprehension is very lowat the pandemic era, Theyare difficult to understand  the text, they don’t haveEnough English vocabulary, Many teachers/lecturer used  techniques that wereless precise in teaching reading, and the students got reading comprehension scores below the minimum completion criteria (KKM). This research aims to determine whether using Reading, Encoding, Annotating, and Pondering techhnique as Learning process in pandemic era to improve reading comprehension stability for students.This research is conducted by using descriptive qualitative method, which describe of students’s problem at pandemic era by zoom in the Internet after that, analyze the data which used percentage.The researcher also has done pre-assesment for supporting accurate data.The subjects of this research were 20 students, consisted 11 females and 9 males. The subject Instrument used in this research is reading comprehension test, researcher observation cheklits and field notes, student observation Cheklist and field notes, interview and documentation by zoom at the Internet. According to avarage results, the increasing for  students' reading comprehension ability on the pre-assessment  is the average student reaches, (55.14%), learning 1  (62.15%), learning 2  (70.14%), and learning 3 (75.65%)  avarage students’ score increase and got standardization of school. Based on the result in each levels which  there is  indeed REAP technique could increasing students’ reading comprehension text.

scholarly journals SHEAR STRENGTH OF RC BEAMS WITHOUT STIRRUP USING HIGH-STRENGTH CONCRETE OF COMPRESSIVE STRENGTH RANGING TO 130MPa

2003 ◽  
pp. 75-91
Author(s):  
Motoyuki SUZUKI ◽  
Mitsuyoshi AKIYAMA ◽  
Wei Lun WANG ◽  
Masayoshi SATO ◽  
Naomi MAEDA ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Rc Beams ◽  
Strength Concrete

scholarly journals Pengaruh Komik Lipat Sederhana Terhadap Hasil Belajar Fisika di MTs Nurul Ishlah Gegelang

2020 ◽  
Vol 3 (1) ◽  
pp. 50
Author(s):  
Linda Sekar Utami ◽  
Johri Sabaryati ◽  
Ni Wayan Sri Darmayanti ◽  
Eka Fitriani
Keyword(s):  
Learning Outcomes ◽  
Design Research ◽  
Research Data ◽  
Control Group ◽  
Ability Test ◽  
Physics Learning ◽  
Group Research ◽  
The Subject ◽  
And Control ◽  
Experimental Group

Abstract:  This study aims to find out the results of physics learning between students who follow the learning with simple folding comic Physics with students who follow conventional learning in grade IX B students at MTs Nurul Ishlah Gegelang. This type of research is included in experimental quasi design research. The population used is all grade IX students in MTs Nurul Ishlah Gegelang. In this study, two classes were taken as a sample of research divided into experimental classes and control classes. obtained samples are class IX B MTs Nurul Ishlah Gegelang as an experimental group and class IX A MTs Nurul Ishlah Gegelang as a control group. Research data in the form of physics learning results in the cognitive sphere was collected using a test of learning results, this research using the design of Pretest-Posstes. The collected data were then analyzed using t-related tests to determine significant differences in learning outcomes between the two sample classes. Based on the results of the study obtained the initial ability of students for both groups is homogeneous shown by Fhitung < Ftabel (1.07 < 2.14) and the differences between the two groups are insignificant on the subject of energy changes with units and the final ability test ruler shown by thitung > ttabel (3,134 > 2,005), so Ha was accepted.Abstrak: Penelitian ini bertujuan untuk mengetahui pngaruh hasil belajar fisika antara siswa yang mengikuti pembelajaran dengan komik lipat sederhana Fisika dengan siswa yang mengikuti pembelajaran konvensional pada siswa kelas kelas IX B di MTs Nurul Ishlah Gegelang. Jenis penelitian ini termasuk dalam penelitian quasi eksperimental design. Populasi yang dipergunakan adalah seluruh siswa kelas IX di MTs Nurul Ishlah Gegelang. Pada penelitian ini diambil dua kelas sebagai sampel penelitian yang terbagi dalam kelas eksperimen dan kelas kontrol. diperoleh sampel yaitu kelas IX B MTs Nurul Ishlah Gegelang sebagai kelompok eksperimen dan kelas IX A MTs Nurul Ishlah Gegelang sebagai kelompok kontrol. Data penelitian berupa hasil belajar fisika pada ranah kognitif dikumpulkan menggunakan tes hasil belajar, Penelitian ini menggunakan desain Pretest-Posstes. Data yang terkumpul selanjutnya dianalisis menggunakan uji-t related untuk mengetahui perbedaan hasil belajar yang signifikan antara kedua kelas sampel. Berdasarkan hasil penelitian diperoleh kemampuan awal siswa untuuk kedua kelompok adalah homogen yang ditunjukkan dengan Fhitung < Ftabel (1,07 < 2,14) serta perbedaan yang dimiliki antara kedua kelompok tidak signifikan pada pokok bahasan perubahan energi dengan satuan dan pengkuran  tes kemampuan akhir yang ditunjukkan dengan thitung  > ttabel (3,134 > 2,005), sehingga Ha diterima.

scholarly journals Experimental Investigation of Shear Strength for Steel Fibre Reinforced Concrete Beams

2021 ◽  
Vol 15 (1) ◽  
pp. 81-92
Author(s):  
Constantinos B. Demakos ◽  
Constantinos C. Repapis ◽  
Dimitros P. Drivas
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Steel Fibre Reinforced Concrete

Aims: The aim of this paper is to investigate the influence of the volume fraction of fibres, the depth of the beam and the shear span-to-depth ratio on the shear strength of steel fibre reinforced concrete beams. Background: Concrete is a material widely used in structures, as it has high compressive strength and stiffness with low cost manufacturing. However, it presents low tensile strength and ductility. Therefore, through years various materials have been embedded inside it to improve its properties, one of which is steel fibres. Steel fibre reinforced concrete presents improved flexural, tensile, shear and torsional strength and post-cracking ductility. Objective: A better understanding of the shear performance of SFRC could lead to improved behaviour and higher safety of structures subject to high shear forces. Therefore, the influence of steel fibres on shear strength of reinforced concrete beams without transverse reinforcement is experimentally investigated. Methods: Eighteen concrete beams were constructed for this purpose and tested under monotonic four-point bending, six of which were made of plain concrete and twelve of SFRC. Two different aspect ratios of beams, steel fibres volume fractions and shear span-to-depth ratios were selected. Results: During the experimental tests, the ultimate loading, deformation at the mid-span, propagation of cracks and failure mode were detected. From the tests, it was shown that SFRC beams with high volume fractions of fibres exhibited an increased shear capacity. Conclusion: The addition of steel fibres resulted in a slight increase of the compressive strength and a significant increase in the tensile strength of concrete and shear resistance capacity of the beam. Moreover, these beams exhibit a more ductile behaviour. Empirical relations predicting the shear strength capacity of fibre reinforced concrete beams were revised and applied successfully to verify the experimental results obtained in this study.

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