scholarly journals Optimization of the Concrete Composition Mix at the Design Stage

2021 ◽  
Vol 7 (8) ◽  
pp. 1389-1405
Author(s):  
Liubov Lisienkova ◽  
Tatiana Shindina ◽  
Nina Orlova ◽  
Liudmila Komarova
Keyword(s):  
Empirical Equation ◽  
Design Stage ◽  
Fine Aggregate ◽  
Concrete Composition ◽  
Composition Design ◽  
Aggregate Fraction ◽  
Concrete Mix ◽  
Composition Optimization ◽  
Selection Of

The problem of the composition optimization of concrete mixes seems to be quite urgent as errors at the composition design stage can lead to problems of concrete at the stage of exploitation such as delamination, cracking etc. Reasonable selection of concrete mix components guarantees the required strength of concrete and reinforced concrete structures in the future. This paper investigates the influence of the concrete mix composition on the strength of concrete. Firstly, typical risks that can occur on the composition design stage have been identified through the experts' interviews. Secondly, this risks were associated with indicators and characteristics that can be tested experimentally. Running of several mathematical models has allowed to outline concrete mix parameters of highest importance and formulate an empirical equation for the dependence of the strength of the concrete mixture on the values of the coarse aggregate quality factor, the fine aggregate fraction and the consumption of the Portland cement has been proposed. As a result, a methodology for controlling the quality of concrete at the stage of the composition design has been formulated. Doi: 10.28991/cej-2021-03091732 Full Text: PDF

scholarly journals Analysis of The Mechanical Properties of Concrete Based on Fly Ash and Palm Oil Clinkers

2021 ◽  
Vol 1 (4) ◽  
pp. 31-35
Author(s):  
L Opirina ◽  
Azwanda Azwanda ◽  
R Febrianto
Keyword(s):  
Fly Ash ◽  
Palm Oil ◽  
Strength Test ◽  
Fine Aggregate ◽  
Concrete Composition ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Compressive Strength Test ◽  
Concrete Mix ◽  
Main Material

Concrete is the result of a mixture of cement, aggregate and water. Under certain conditions, the concrete mixture can be added with additives and admixture to get the concrete as needed. Cement is the most important material in the manufacture of conventional concrete. When cement is produced, the same amount of CO2 will also be generated as a side effect and pollute the atmosphere. Fly ash as an alternative to cement will be introduced as an alternative concrete material to reduce the use of cement in the concrete mix. In addition to the use of charcoal fly ash as a partial substitute for cement, this study also uses palm oil clinkers as a substitute for fine aggregate as much as 20%. This replacement material is an industrial waste which has the main content of silica and alumina which is similar to the main material for forming concrete. In addition, the use of these two materials also aims to reduce the exploration of the use of natural materials. This research introduces 3 kinds of concrete composition. The grouping is based on the ratio of fly ash and cement used, namely (60%:40%), (70%:30%) and (80%:20%). The test object used is a concrete cylinder with a diameter of 150 mm and a height of 300 mm. Tests were carried out at the age of 28 days of concrete. The compressive strength test showed that the best concrete was produced from the combination of the addition of 60% fly ash of coal aged 28 days, which was 4.21 MPa.

Concrete Mix Design Using Particle Packing Method: Literature Review, Analysis, and Computation

2021 ◽  
Vol 2 (1) ◽  
pp. 83-102
Author(s):  
Shreya Sunil Tolmatti ◽  
◽  
Sanskruti Jaywant Jadhav ◽  
Sakshi Satish Jadhav ◽  
Mayur M. Maske ◽  
...  
Keyword(s):  
Packing Density ◽  
Particle Packing ◽  
Fine Aggregate ◽  
Density Method ◽  
Correlation Curve ◽  
Concrete Mix Design ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Paste Content

Particle packing technology is used to reduce the amount of cement in concrete by optimizing the concrete mix, resulting in more sustainable concrete. In this study, four different methods were used to determine the distribution of the mixture presented; packing density method, packing density method, IS code method, and packing density method. In the packing density method, the paste content that exceeds the voids will increase along with the increase in the quality of the concrete. In cases of packing density, the cement-water ratio decreases with the quality of the concrete. In the packing of too many trials, trials and tribulations should be carried out to achieve the ratio of water-cement and paste content for a certain grade of concrete. This correlation curve helps reduce the experiments involved in determining the ratio of semen and paste content for a given concrete quality. The water and cement contents for the packing density and the IS code method are almost the same for each particular concrete class. The workability of concrete achieved was more in the packing density method than the IS code method for the same concrete quality, because the water-cement ratio was slightly higher in the packing density method than the IS code method. The required fine aggregate particles are more in terms of packing density method compared to the IS code method. Therefore, more water and cement are required in terms of packing density. The correlation curve can be used to determine the ratio of water-cement and paste the content that exceeds the voids for a certain concrete quality

The Influence of Compressive Strength of EPS Concrete Using Fiberglass with Curing and Non Curing Treatment

2015 ◽  
Vol 747 ◽  
pp. 226-229
Author(s):  
Irpan Hidayat ◽  
Jemima Devina Halim
Keyword(s):  
Compressive Strength ◽  
Hydration Reaction ◽  
Fine Aggregate ◽  
Concrete Experience ◽  
Alternative Materials ◽  
Concrete Mix ◽  
Compressive Strength Of Concrete ◽  
Materials Used ◽  
Fiberglass Material

Concrete is a mixture of portland cement, fine aggregate, coarse aggregate and water, with or without additives which form a solid mass. The purpose of this study was to find and innovative method of producing concrete mix from solid waste material as alternative. The alternative materials used in concrete mix was fiberglass. Material reduction in the sand on the concrete can decreases the strength until the fiberglass material added and increase the compressive strength on concrete. The composition of fiberglass that used in this study was 0%, 0.5%, 1%, 1.5%, 2%, 2.5%. The methodology used is the design of concrete mix in according to SNI 03-2834-2000. The results are concrete with the addition of EPS can reduce the density and the compressive strength of normal concrete, concrete EPS was added to increase the value of compressive strength fiberglass. The addition of fiberglass in concrete EPS only on the variable of 0.5% - 1% fiberglass, if greater than 1%, the compressive strength of concrete decreased because the material has not homogeneous concrete during mixing. The largest density value of 10% EPS concrete with fiberglass on the concrete test 28 days is the concrete EPS 10% + 0.5% fiberglass by weight of the curing process and the type of 2127.73 MPa and compressive strength are the largest and EPS concrete with compressive strength amounted to 11.277 MPa. The addition of 10% EPS can reduce the compressive strength of concrete at 3.75%. The addition of fiberglass obtained with a percentage of 0.5% - 1% is the most effective additions so as to improve the quality of concrete by 0.74%. Concrete with compressive strength has a curing system which is much better than the non-curing concrete, because concrete experience of concrete hydration reaction process which takes place optimally.

scholarly journals Experimental Study of the Use of Pumice Sand in the Rigid Pavement

2019 ◽  
Vol 2 (1) ◽  
pp. 61-66
Author(s):  
Abdul Gaus ◽  
Imran Imran ◽  
Chairul Anwar ◽  
Liska Novianti
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Volcanic Glass ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Rigid Pavement ◽  
Concrete Mix ◽  
Pumice Sand ◽  
Compressive Strength Of Concrete

The Pumice sand is a bright colored butian type, containing foam made from glass-walled bubbles and usually referred to as silicate volcanic glass granules. This pumice sand can be used as a substitute for normal sand as fine aggregate in a mixture of concrete mix. Based on the characteristic test examination, it can be seen that in testing the characteristics of pumice sand to the specifications of normal sand in specific gravity testing and weight testing of quicksand obtained results that are smaller than the specifications of normal sand and absorption tests obtained results greater than specifications on normal sand. The results of the normal sand compressive strength at BN is 250.95 kg /cm2 while the results of the floating sand concrete compressive strength on BPA is 224, 965 kg /cm2. Based on the research it can be concluded that with the same quality of concrete, the quality of K-250 is different in comparison to the compressive strength of concrete in normal sand and pumice sand concrete shows almost the same results. Therefore, more in-depth research is needed regarding the use of pumice sand instead of normal sand in a mixture of concrete mix

scholarly journals ANALISA KUAT TEKAN BETON MENGGUNAKAN PASIR APUNG

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Abdul Gaus ◽  
Imran Imran ◽  
Liska Novianti
Keyword(s):  
Compressive Strength ◽  
Specific Gravity ◽  
Volcanic Glass ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Concrete Mix ◽  
Pumice Sand ◽  
Compressive Strength Of Concrete

Pumice sand is a bright colored butian type, containing foam made from glass-walled bubbles andusually referred to as silicate volcanic glass granules. This pumice sand can be used as a substitutefor normal sand as fine aggregate in a mixture of concrete mix. Based on the characteristic testexamination, it can be seen that in testing the characteristics of pumice sand to the specificationsof normal sand in specific gravity testing and weight testing of quicksand obtained results thatare smaller than the specifications of normal sand and absorption tests obtained results greaterthan specifications on normal sand. The results of the normal sand compressive strength at BN is250.95 kg /cm2 while the results of the floating sand concrete compressive strength on BPA is224, 965 kg /cm2. Based on the research it can be concluded that with the same quality of concrete,the quality of K-250 is different in comparison to the compressive strength of concrete in normalsand and pumice sand concrete shows almost the same results. Therefore, more in-depth researchis needed regarding the use of pumice sand instead of normal sand in a mixture of concrete mix.

Influence of “MC-Bauchemie” Additions on the Fine-Grained Concrete Properties

2020 ◽  
Vol 309 ◽  
pp. 114-119
Author(s):  
Ekaterina S. Gerasimova ◽  
Elizaveta Gumirova
Keyword(s):  
Cement Stone ◽  
Hardened Cement ◽  
Fine Aggregate ◽  
Fine Grained ◽  
Concrete Properties ◽  
Concrete Mix ◽  
Materials Used ◽  
Effective Additive ◽  
Optimal Quantity

The paper is devoted to research of influence of “MC-Bauchemie” additions on the fine-grained concrete properties, namely compressive strength. The results of testing of fine-grained concrete made on the basis of two different natural sands are presented. Characteristics of the initial materials used in the work (Portland cement, sands and additions-plasticizers) are given. The basic methods of preparation of mixes and testing of hardened cement stone and concrete are described. The optimal quantity of the selected additions on the example of cement paste and stone are established. Mobility dependences of concrete mixes on a type and quantity of plasticizers are received. The dependence of the additions effectiveness on the mobility of the concrete mix on the quality of the fine aggregate is shown. It is established that the most effective additive is PowerFlow 3100, its optimal amount for obtaining fine-grained concrete on the basis of JSC “Kar’er Myisyi” sand is 0.2 %.

ON THE EXPERT’S RIGHT TO BE PRESENT AT LEGAL PROCEEDINGS

2016 ◽  
Vol 15 ◽  
pp. 163-171
Author(s):  
M. G. Shcherbakovskiy
Keyword(s):  
Initial Data ◽  
Legal Proceedings ◽  
Reliable Assessment ◽  
Data Acquiring ◽  
Selection Of

The article discusses the reasonsfor an expert to participate in legal proceedings. The gnoseological reason for that consists of the bad quality of materials subject to examination that renders the examination either completely impossible or compromises objective, reasoned and reliable assessment of the findings. The procedural reason consists ofa proscription for an expert to collect evidence himself or herself. The author investigates into the ways of how an expert can participate in legal proceedings. If the defense invites an expert to participate in the proceedings, then it is recommended that his or her involvement should be in the presence of attesting witnesses and recorded in the protocol. In the course of the legal proceedings an expert has the following tasks: adding initial data, acquiring new initial data, understanding the situation of the incident, acquiring new objects to be studied, including samples for examination. An expert’s participation in legal proceedings differs from the participation of a specialist or an examination on the scene of the incident. The author describes the tasks that an expert solves in the course of legal proceedings, the peculiarities ofan investigation experiment practices, the selection of samples for an examination, inspection, interrogation.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

DESIGN, SIMULATION AND IMPLEMENTATION MONITORING SYSTEM FOR SYSTEM CONTROL C4 FEEDING PUMP FOR FEED VAPORIZATION IN THE BUTADIENE PLANT

2020 ◽  
Vol 1 (1) ◽  
pp. 31-35
Author(s):  
Fahmi Yunistyawan ◽  
Yunistyawan J Berchmans ◽  
Gembong Baskoro
Keyword(s):  
Motor Control ◽  
Control System ◽  
Field Operator ◽  
System Control ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Software And Hardware ◽  
Discharge Pressure ◽  
Selection Of

This study implements the auto start control system on an electric motor 3 phase C4Feeding pump when the discharge pressure is low-low (4.3 kg /cm²). The C4 feeding pumpmotor was initially manually operated from the local control station, this was very ineffectiveand inefficient because it still relied on the field operator to operate the pump motor and whenthe plant was in normal operating it is very risk if the field operator late to operate motor then itwill impact to quality of the product, and if the delay time to operate motor is too long then planthave to shut down, therefore improvement is needed in the C4 feeding pump motor controlsystem. In this paper, various types of 3-phase motor control are explained which allow it to beapplied to the C4 feeding pump motor that are on-off, inverter, and variable speed drive andefficient selection of the three systems control of the motor. Software and hardware used in thisthesis work are DCS CENTUM VP Yokogawa.

Sign in / Sign up

Export Citation Format

Share Document