scholarly journals EVALUATION OF SUBGRADE CAPACITY OF JIMMA SOILS USING DCP TEST: A CORRELATION OF CBR AND DCPI

2018 ◽  
Vol 30 (3) ◽  
Author(s):  
Jemal J. Muhammed ◽  
Murad M. Abdella
Keyword(s):  
Coefficient Of Determination ◽  
Cone Penetrometer ◽  
Subgrade Soils ◽  
Fine Grained ◽  
Physical Conditions ◽  
Dynamic Cone Penetrometer ◽  
Cbr Test ◽  
Time Required ◽  
The Cost ◽  
The Given

Subgrade strength of soils is usually evaluated using California Bearing Ratio (CBR) values. As the cost and time required to conduct CBR test are high, dynamic cone penetrometer (DCP) would be recommended and CBR value can be estimated later from DCP result using a correlation formula. In this paper, laboratory CBR of Jimma fine-grained soils has been correlated with field DCP values referring to the physical properties such as natural moisture content and field density; as these factors significantly influence the behaviour of subgrade soils. Different techniques were used to demonstrate relations that best suit to find values of CBR from DCP test. Equations were developed between CBR and dynamic cone penetrometer index (DCPI) for the total of 36 sample points and adjusted coefficient of determination becomes 0.84. A validation was also done to test the applicability of the developed correlation formula for the local soils with the given physical conditions. The correlation gave a promising relationship between CBR and DCP and can be applicable for preliminary design purpose with the due consideration of the locality circumstances.

Functional model for the synthesis of nanostructures of the given quality level

2021 ◽  
Vol 2 (107) ◽  
pp. 72-84
Author(s):  
Y.O. Suchikova ◽  
S.S. Kovachov ◽  
G.O. Shishkin ◽  
D.O. Pimenov ◽  
A.S. Lazarenko ◽  
...  
Keyword(s):  
Raw Materials ◽  
Functional Model ◽  
Quality Level ◽  
Factors Affecting ◽  
Functional Modelling ◽  
Tunable Properties ◽  
Time Required ◽  
The Cost ◽  
The Given ◽  
Synthesis Of Nanostructures

Purpose: The aim of this paper is to develop a functional model for the synthesis of nanostructures of the given quality level, which will allow to effectively control the process of nanopatterning on the surface of semiconductors with tunable properties. Design/methodology/approach: The paper uses the IDEF0 methodology, which focuses on the functional design of the system under study and describes all the necessary processes with an accuracy sufficient for an unambiguous modelling of the system's activity. Based on this methodology, we have developed a functional model for the synthesis of nanostructures of the given quality level and tested its effectiveness through practice. Findings: The paper introduces a functional model for the synthesis of nanostructures on the surface of the given quality level semiconductors and identifies the main factors affecting the quality of nanostructures as well as the mechanisms for controlling the formation of porous layers with tunable properties. Using the example of etching single-crystal indium phosphide electrochemically in a hydrochloric acid solution, we demonstrate that the application of the suggested model provides a means of forming nanostructures with tunable properties, assessing the quality level of the nanostructures obtained and bringing the parameters in line with the reference indicators at a qualitatively new level. Research limitations/implications: Functional modelling using the IDEF0 methodology is widely used when process control is required. In this study it has been applied to control the synthesis of nanostructures of the given quality level on the surface of semiconductors. However, these studies require continuation, namely, the establishment of correlations between the technological and resource factors of synthesis and the acquired properties of nanostructures. Practical implications: This study has a significant practical effect. Firstly, it shows that functional modelling can reduce the time required to form large batches of the given quality level nanostructures. This has made it possible to substantiate the choice of the initial semiconductor parameters and nanostructure synthesis modes in industrial production from the theoretical and empirical perspective. Secondly, the presented methodology can be applied to control the synthesis of other nanostructures with desired properties and to reduce the expenses required when resources are depleted and the cost of raw materials is high. Originality/value: This paper is the first to apply the IDEF0 methodology to control the given quality nanostructure synthesis. This paper will be of value to engineers who are engaged in the synthesis of nanostructures, to researchers and scientists as well as to students studying nanotechnology.

scholarly journals Studi Literatur Korelasi Hasil Uji Berdasarkan Uji Plate Bearing dan Uji Dynamic Cone Penetrometer

2020 ◽  
Vol 3 (4) ◽  
pp. 1157
Author(s):  
Steven Lius ◽  
Inda Sumarli ◽  
Ali Iskandar
Keyword(s):  
Soil Samples ◽  
Cone Penetrometer ◽  
Clayey Soils ◽  
In Situ Test ◽  
Subgrade Soils ◽  
Testing Method ◽  
Dynamic Cone Penetrometer ◽  
Subgrade Soil

The subgrade soils must be able to withstand the load that is transferred. The quality of the subgrade soil is important because if it is sturdy, the construction above it can also be sturdy as well. Therefore, in designing a construction, soil investigation, such as plate bearing test and dynamic cone penetrometer test, must be conducted. However, one method may be superior compared to others, that the author will analyze the correlation between them. Plate bearing test is an in-situ test used for determining the ultimate bearing capacity of soil by only applying pressure to it. Whereas, dynamic cone penetrometer test is a testing method to measure the thickness and strength of soil. In this research, the collected data will be analyzed and correlated. The result of correlation between ks and CBR from DCP test is the determinant coefficient value. The value for clayey soils is 0.6198 which means that the correlation value is strong. Meanwhile, for sandy soils, the values are 0.9841 and 0.9878 which means both of the correlation values are very strong. Furthermore, the correlation of Su values from both tests cannot be determined because the soil samples have not reached the fracture condition. Lapisan subgrade merupakan lapisan yang menahan seluruh beban di atasnya. Kualitas dari lapisan ini sangat penting, karena jika lapisan subgrade tersebut kokoh, maka konstruksi di atasnya juga akan kokoh. Oleh karena itu, dalam merencanakan sebuah konstruksi, penyelidikan tanah, seperti uji plate bearing dan uji dynamic cone penetrometer, di lokasi suatu bangunan yang akan dibangun itu sangat penting. Namun, setiap metode penyelidikan tanah tentunya memiliki kelebihan dan kekurangan masing-masing, sehingga penulis akan menganalisa korelasi antara kedua pengujian. Uji plate bearing merupakan metode pengujian untuk menentukan nilai daya dukung tanah dengan hanya memberikan tekanan pada tanah. Sedangkan, uji dynamic cone penetrometer merupakan metode pengujian untuk mengetahui nilai ketebalan dan kekuatan suatu lapisan tanah. Pada penelitian ini, data yang sudah dikumpulkan akan dianalisa dan dikorelasikan. Hasil korelasi antara nilai modulus reaksi tanah dasar dan CBR dari uji DCP untuk jenis tanah lempung menghasilkan koefisien determinan sebesar 0.6198 yang artinya nilai korelasi tersebut kuat. Sedangkan, untuk jenis tanah pasir, didapatkan koefisien determinan sebesar 0.9841 dan 0.9878 yang artinya nilai korelasi tersebut sangat kuat. Kemudian, untuk korelasi nilai kuat geser tanah dari masing-masing pengujian belum bisa dijelaskan karena sampel tanah yang digunakan belum mencapai kondisi fracture.

The Use of Dynamic Cone Penetrometer to Predict Resilient Modulus of Subgrade Soils

2005 ◽  
Author(s):  
Ananda Herath ◽  
Louay N. Mohammad ◽  
Kevin Gaspard ◽  
Ravindra Gudishala ◽  
Murad Y. Abu-Farsakh
Keyword(s):  
Resilient Modulus ◽  
Cone Penetrometer ◽  
Subgrade Soils ◽  
Dynamic Cone Penetrometer

scholarly journals Comparison of California Bearing Ratio (CBR) Value Based on Cone Penetration Test (CPT) and Dynamic Cone Penetrometer (DCP)

2021 ◽  
Vol 4 (2) ◽  
pp. 70
Author(s):  
Reki Arbianto ◽  
Teguh Yuono ◽  
G Gunarso
Keyword(s):  
Soil Layer ◽  
Cone Penetration Test ◽  
California Bearing Ratio ◽  
Small Scale ◽  
Cone Penetrometer ◽  
Penetration Test ◽  
Cone Penetration ◽  
Dynamic Cone Penetrometer ◽  
Heavy Equipment ◽  
Cbr Test

In civil engineering, land is important because as a place for building infrastructure to be built, so that the building infrastructure on it is stable, adequate carrying capacity is needed. The amount of soil bearing capacity can be determined in several ways, including the California Bearing Ratio (CBR) Field Test, Cone Penetration Test (CPT) and Dynamic Cone Penetrometer (DCP). The CBR and DCP tests are often used to determine the level of surface soil density on road structures, while CPT is usually used to determine the hard soil layer on the building structure. However, in certain situations Sondir and DCP data are often used to predict the CBR value, because the test is quite practical and efficient compared to the CBR test. CBR testing requires heavy equipment which in most small-scale projects is not available. In this study, we compared the CBR value based on the data obtained from the Sondir and DCP tests. Data collection was carried out in Surakarta and its surroundings. Based on the test results, the CBR value generated from the DCP test tends to be smaller than that from the CPT test with a ratio of 0.62: 1. This study resulted in the relationship between CBR values from the results of the CPT and DCP tests shown in the following equation: CBR (DCP) % = 0.2552 CBR(CPT) + 2.6306 and CBR (DCP) % = 0.617 CBR(CPT).

Prediction of Resilient Modulus of Cohesive Subgrade Soils from Dynamic Cone Penetrometer Test Parameters

2007 ◽  
Vol 19 (11) ◽  
pp. 986-992 ◽  
Author(s):  
Louay N. Mohammad ◽  
Ananda Herath ◽  
Murad Y. Abu-Farsakh ◽  
Kevin Gaspard ◽  
Ravindra Gudishala
Keyword(s):  
Resilient Modulus ◽  
Cone Penetrometer ◽  
Subgrade Soils ◽  
Dynamic Cone Penetrometer ◽  
Test Parameters

Use of cold tolerant eucalyptus species as a partial replacement for southern mixed hardwoods

TAPPI Journal ◽  
2012 ◽  
Vol 11 (7) ◽  
pp. 29-35 ◽  
Author(s):  
PETER W. HART ◽  
DALE E. NUTTER
Keyword(s):  
Potential Method ◽  
The United States ◽  
Partial Replacement ◽  
Growth Time ◽  
Eucalyptus Species ◽  
Cold Tolerant ◽  
Hardwood Pulp ◽  
Time Required ◽  
The Cost ◽  
Operational Data

During the last several years, the increasing cost and decreasing availability of mixed southern hardwoods have resulted in financial and production difficulties for southern U.S. mills that use a significant percentage of hardwood kraft pulp. Traditionally, in the United States, hardwoods are not plantation grown because of the growth time required to produce a quality tree suitable for pulping. One potential method of mitigating the cost and supply issues associated with the use of native hardwoods is to grow eucalyptus in plantations for the sole purpose of producing hardwood pulp. However, most of the eucalyptus species used in pulping elsewhere in the world are not capable of surviving in the southern U.S. climate. This study examines the potential of seven different cold-tolerant eucalyptus species to be used as replacements for, or supplements to, mixed southern hardwoods. The laboratory pulping and bleaching aspects of these seven species are discussed, along with pertinent mill operational data. Selected mill trial data also are reviewed.

FAKTOR-FAKTOR YANG MEMPENGARUHI PENDAPATAN USAHATANI KACANG TANAH DI KECAMATAN SEMAU KABUPATEN KUPANG

2020 ◽  
Vol 21 (1) ◽  
pp. 25-33
Author(s):  
Deni K.L. Mudin ◽  
Paulus Un ◽  
Lika Bernadina
Keyword(s):  
Social Life ◽  
Economic Value ◽  
Coefficient Of Determination ◽  
Labor Costs ◽  
Land Area ◽  
Average Income ◽  
Dry Land ◽  
Regression Methods ◽  
The Cost ◽  
Total Average

ABSTRACT Peanuts are one of the high economic value commodities in the dry land area. This commodity also contributes to the social life of the dry land area. This research has been conducted in Semau Sub-district, Kupang Regency, with the aim to determine the amount of income, break event point (BEP), R / C ratio, efficiency of capital use and factors that affect the income of peanuts farming, with the number of farmer respondents as many as 92 people , simple randomly selected. Data that has been collected by survey, library and interview methods; analyzed quantitatively-descriptive using regression methods. The results showed that the total average income of peanut farming in the study location was IDR 1,739,895 with a total average income of IDR 3,498,261 and a total average cost of IDR 1,758,366. While the break event point average of production is 147 Kg and the break event point price is IDR. 6.509, while for the total average the R / C ratio is 1.99. With factors that affect income are production (X1), seed costs (X2), and labor costs (X3). From the regression results with the Cobb-Douglass function the coefficient of determination (R2) is 0.822 with the meaning that variations in independent variables such as production, seed costs and labor costs explain the dependent variable namely income (Y) of 82.20% and the rest 17.80 % is explained by variables outside of the variables analyzed. From the results of the F test (diversity test) it was found that the factors X1, X2, and X3 had a significant effect on income at ⍺ 1%, then accept H1 at least one of: βi ≠ 0. Whereas the results of the t test (partial test) obtained that factors significant effect on income, namely production (X1) and labor costs (X2), while the cost of seeds (X3) does not significantly affect income.

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