scholarly journals Compressive strength values dispersion of side-mixed and ready-mixed concretes

2017 ◽  
Vol 10 (5) ◽  
pp. 972-984
Author(s):  
A. ALVES ◽  
F. SANTOS ◽  
A. DEOGENES ◽  
K. MOREIRA ◽  
E. MESQUITA
Keyword(s):  
Compressive Strength ◽  
Low Cost ◽  
Influence Factors ◽  
Structure Design ◽  
Design Parameters ◽  
Reinforced Concrete Structure ◽  
Average Strength ◽  
Testing Method ◽  
Concrete Mixtures ◽  
Concrete Quality

Abstract Compressive strength testing method has been widely used as indirect way for evaluate the concrete quality, due to it simplest execution, reliability of the results achieved and low cost of execution. Independently, if the concrete was side or ready-mixed, it is necessary to achieve the compressive strength requirements stated during structure design, essentially because this parameter allows the obtainment of the average strength of the reinforced concrete structure analyzed. Following, as for ready-mixed, as for side-mixed concretes, it is need to ensure the correspondence between the concrete design parameters and the concrete mixed, namely these parameters are summarized in terms of the compressive strength and homogeneity in the different phases of the construction. This way, the present work aims to do the analysis of the dispersions of the compressive strength of concretes mixtures (corresponding to compressive strength classes of 20, 25, 30, 35 and 40 MPa), and identify some influence factors, in this case, the influence of the workers team variation. Two mixtures (35 MPa and 40 MPa) were ready-mixed, while five of the concrete mixtures were side-mixed, by five different worker’s group with same time of experience on concrete’s manufacture. The results demonstrate that the variation of the workers team presents a high influence for the homogeneity of the compressive strength of the concrete.

scholarly journals Analisa Agregat Halus Pasir Zona III Dengan Agregat Kasar Ukuran 20 mm Dan 40 mm Untuk Uji Kuat Tekan Mutu Beton Pada Campuran Beton Normal

2018 ◽  
Vol 1 (1) ◽  
pp. 11 ◽  
Author(s):  
Nasir Bumulo ◽  
Nur Windawaty Rusnadin
Keyword(s):  
Compressive Strength ◽  
Construction Material ◽  
Control Variable ◽  
Fine Aggregate ◽  
Test Results ◽  
Testing Method ◽  
A Value ◽  
Concrete Quality ◽  
Independent Variable ◽  
Sand Material

Concrete is a construction material that is widely used in building structutre work in indonesia becouse it has many benefits. Its compactness and cooperation arragement is very influential toward the compressive strength. One factor is the compectness of concrete fine aggregate and coarse aggregate. The aim of this research was to find out compessive strength of concrete at 28 days using sand material zone III with pebbles the size of 20 mm and 40 mm in a normal concrete mix.The reseach was using the quantitaive testing method. The independent variable of this research was the composition of the mixture, and dependent variable was in the form of concrete quality. The control variable was the material being used. The data collection was done by conducting laboratory testing based on SNI and PBI. The data analysis was done by calculating the average of the test results are then compered with SNI and PBI.The result of concrete research with sand material of zone III and gravel of 20 mm and 40 mm was observed at 28 days old showed a compressive strength value of 311,89 Kg / cm2. Then the concrete sample with sand material of zone III and pebble size 40 mm shows the value of compressive strength of 334,46 Kg / cm2. From this result, it can be concluded that the mixture of sand zone III with gravel measuring 40 mm has a value of concrete compressive strength greater than 20 mm.

Optimalisasi Kuat Tekan dan Kuat Lentur Beton Menggunakan Campuran Lateks

2021 ◽  
Vol 4 (2) ◽  
pp. 159
Author(s):  
Ary Prastowo ◽  
Ahmad Ridwan ◽  
Edy Gardjito ◽  
Zendy Bima Mahardana
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Construction Material ◽  
Building Construction ◽  
Adhesive Properties ◽  
Concrete Mixtures ◽  
A Value ◽  
Concrete Production ◽  
Concrete Quality

Concrete is a building construction material that has an important role. Concrete itself tends to have strong properties in resisting compressive forces, but weak in resisting tensile or flexural forces. The use of additives in concrete is an option to improve the basic properties of concrete. Latex or rubber latex is one of the natural materials that can be used in concrete mixtures. Its adhesive properties can be utilized in improving the quality of concrete. This study aims to determine the compressive strength and flexural strength of concrete with the addition of latex. The research was conducted experimentally by making concrete specimens in the laboratory. The addition of latex by 10% and 30% with a planned concrete quality of fc' 29.5 MPa. The test object used is a cylinder measuring 15x30 cm and a beam measuring 15x15x30 cm. The tests carried out were testing the compressive strength and flexural strength at the age of 28 days. The results showed that the highest compressive strength was at the addition of 10% latex with a value of 9.96 MPa. While the highest flexural strength value obtained was 3.20 Mpa at the addition of 10% Latex or. From these results it can be seen that the addition of latex has not been able to improve the quality of concrete and has not been able to increase the compressive strength or flexural strength of concrete. So that these results can be used as research development or concrete production.

Optimization Design and Application of Sluice Pier Sliding Formwork

2013 ◽  
Vol 671-674 ◽  
pp. 2005-2010
Author(s):  
Jun Xing ◽  
Hong Liang Cai ◽  
Jian Bing Cheng
Keyword(s):  
Optimization Design ◽  
Simulated Annealing Algorithm ◽  
High Efficiency ◽  
Low Cost ◽  
Least Square Method ◽  
Structure Design ◽  
Least Square ◽  
Advanced Technology ◽  
Design Parameters ◽  
Best Value

The sliding formwork, combining high efficiency and low cost, is a kind of advanced technology in the construction of sluice pier of hydropower projects. Number of jacks and elevating shelf spacing are two important parameters in the structure design of sliding formwork, the mathematical model of the relationship between manufacture costs and jack number, spacing between the elevating shelf was established using polynomial least square method, the best value of jack number and spacing between the elevating shelf were calculated by using the simulated annealing algorithm, thereby optimized the design parameters of sliding formwork structure, whilst expatiated the technology of installing, debugging, sliding and disassembly of sliding formwork, put forward the feasible methods for solving the problems that often appeared in the construction of sliding formwork, summed up the merits of sliding formwork, analyzed the technology and economical benefit of sliding formwork

IoT based e-Healthcare System to Enable Remote Patient Care based on Cloud Server

2017 ◽  
Vol 7 (7) ◽  
pp. 36
Author(s):  
P.Venu Gopala Rao ◽  
Eslavath Raja ◽  
Ramakrishna Gandi ◽  
G. Ravi Kumar
Keyword(s):  
Low Cost ◽  
Vital Signs ◽  
Smart Phone ◽  
Medical Professional ◽  
Design Parameters ◽  
Cloud Server ◽  
Significant Area ◽  
Efficient Data ◽  
System Data ◽  
Remote Patient

IoT (Internet of Things) has become most significant area of research to design an efficient data enabled services with the help of sensors. In this paper, a low-cost system design for e-healthcare service to process the sensitive health data is presented. Vital signs of the human body are measured from the patient location and shared with a registered medical professional for consultation. Temperature and heart rate are the major signals obtained from a patient for the initial build of the system. Data is sent to a cloud server where processing and analysis is provided for the medical professional to analyze. Secure transmission and dissemination of data through the cloud server is provided with an authentication system and the patient could be able to track his data through a smart phone on connecting to the cloud server. A prototype of the system along with its design parameters has been discussed.

Design of a wheeled wall climbing robot based on the performance of bio-inspired dry adhesive material

Robotica ◽  
2021 ◽  
pp. 1-14
Author(s):  
Hongkai Li ◽  
Xianfei Sun ◽  
Zishuo Chen ◽  
Lei Zhang ◽  
Hongchao Wang ◽  
...  
Keyword(s):  
Flat Surface ◽  
Thrust Force ◽  
Adhesion Force ◽  
Structure Design ◽  
Design Parameters ◽  
Climbing Robot ◽  
Adhesive Material ◽  
Ducted Fan ◽  
The Stability ◽  
Belt System

Abstract Inspired by gecko’s adhesive feet, a wheeled wall climbing robot is designed in this paper with the synchronized gears and belt system acting as the wheels by considering both motion efficiency and adhesive capability. Adhesion of wheels is obtained by the bio-inspired adhesive material wrapping on the outer surface of wheels. A ducted fan mounted on the back of the robot supplies thrust force for the adhesive material to generate normal and shear adhesion force whilemoving on vertical surfaces. Experimental verification of robot climbing on vertical flat surface was carried out. The stability and the effect of structure design parameters were analyzed.

scholarly journals Towards Sustainable Concrete Composites through Waste Valorisation of Plastic Food Trays as Low-Cost Fibrous Materials

2021 ◽  
Vol 13 (4) ◽  
pp. 2073 ◽  
Author(s):  
Hossein Mohammadhosseini ◽  
Rayed Alyousef ◽  
Mahmood Md. Tahir
Keyword(s):  
Compressive Strength ◽  
Low Cost ◽  
Impact Resistance ◽  
Food Tray ◽  
World Population ◽  
Fibrous Materials ◽  
Palm Oil Fuel Ash ◽  
Waste Plastic ◽  
Compressive Strength Of Concrete ◽  
The Impact

Recycling of waste plastics is an essential phase towards cleaner production and circular economy. Plastics in different forms, which are non-biodegradable polymers, have become an indispensable ingredient of human life. The rapid growth of the world population has led to increased demand for commodity plastics such as food packaging. Therefore, to avert environment pollution with plastic wastes, sufficient management to recycle this waste is vital. In this study, experimental investigations and statistical analysis were conducted to assess the feasibility of polypropylene type of waste plastic food tray (WPFT) as fibrous materials on the mechanical and impact resistance of concrete composites. The WPFT fibres with a length of 20 mm were used at dosages of 0–1% in two groups of concrete with 100% ordinary Portland cement (OPC) and 30% palm oil fuel ash (POFA) as partial cement replacement. The results revealed that WPFT fibres had an adverse effect on the workability and compressive strength of concrete mixes. Despite a slight reduction in compressive strength of concrete mixtures, tensile and flexural strengths significantly enhanced up to 25% with the addition of WPFT fibres. The impact resistance and energy absorption values of concrete specimens reinforced with 1% WPFT fibres were found to be about 7.5 times higher than those of plain concrete mix. The utilisation of waste plastic food trays in the production of concrete makes it low-cost and aids in decreasing waste discarding harms. The development of new construction materials using WPFT is significant to the environment and construction industry.

scholarly journals The Effect of Recycled HDPE Plastic Additions on Concrete Performance

Recycling ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 18
Author(s):  
Tamrin ◽  
Juli Nurdiana
Keyword(s):  
Compressive Strength ◽  
High Density Polyethylene ◽  
Concrete Mixtures ◽  
Best Response ◽  
Structural Applications ◽  
Optimal Mix ◽  
Increased Strength ◽  
Selection Of ◽  
Recycled Hdpe ◽  
Lower Medium

This study examined HDPE (high-density polyethylene) plastic waste as an added material for concrete mixtures. The selection of HDPE was based on its increased strength, hardness, and resistance to high temperatures compared with other plastics. It focused on how HDPE plastic can be used as an additive in concrete to increase its tensile strength and compressive strength. 156 specimens were used to identify the effect of adding different percentages and sizes of HDPE lamellar particles to lower, medium, and higher strength concrete for non-structural applications. HDPE 0.5 mm thick lamellar particles with sizes of 10 × 10 mm, 5 × 20 mm, and 2.5 × 40 mm were added at 2.5%, 5%, 10%, and 20% by weight of cement. The results showed that the medium concrete class (with compressive strength equal to 10 MPa) had the best response to the addition of HDPE. The 5% HDPE addition represented the optimal mix for all concrete types, while the 5 × 20 mm size was best.

The Influence Factors of Compressive Strength and Production of Mineral Polymer of Aluminum Rocks in Xiuwen County, Guizhou Province, China

2013 ◽  
Vol 690-693 ◽  
pp. 1086-1090
Author(s):  
Jie Zhang ◽  
Qiong Qiong Li ◽  
Yu Qiang Xiong
Keyword(s):  
Compressive Strength ◽  
Water Glass ◽  
Mineral Water ◽  
Raw Materials ◽  
Influence Factors ◽  
Polymer Materials ◽  
Guizhou Province ◽  
Liquid Ratio ◽  
Alkaline Activator ◽  
Solid Liquid

Aluminous rocks from Xiuwen County, Guizhou are the main raw materials, mixed some kaolin mineral. Water glass and alkaline activators are used to product polymer materials, the main experimental indicators are the compressive strength. Here, the studies on amount of water glass and alkaline activator, solid-liquid ratio, amount of kaolin and effects on compressive strength of Geopolymer have been proceeded respectively. The result shows that: the highest compressive strength of geopolymers is17.94 Mpa, with aluminous rock 40g, solid-liquid ratio 2.2, water glass12g and alkali activator 2.01g, as well as kaolin 18.02g.

Optimization Research of Mix Proportion of Frost Resistance Construction of Concrete Based on the MATLAB Language

2014 ◽  
Vol 584-586 ◽  
pp. 1917-1921
Author(s):  
Jun Jie Zhang ◽  
Rui Hong Shao ◽  
Xiang Yi Meng
Keyword(s):  
Compressive Strength ◽  
Objective Function ◽  
Frost Resistance ◽  
Unit Volume ◽  
Influence Factors ◽  
Multi Objective Optimization ◽  
Cold Region ◽  
Freeze Thaw ◽  
Performance Indexes ◽  
Mix Proportion

Analyze the influence factors of mix proportion affecting concrete freeze-thaw damage. Use the five main performance indexes of the concrete, which are compressive strength, strength of extension, impermeability grade, and frost resistance grade and per unit volume cost concrete, as the objective function of multi-objective optimization equation. Invoke the fgoalattain function in the MATLAB Optimization Toolbox to solve. The optimized parameters of mix proportion of frost resistance construction of unit concrete in cold region are: concrete 1532.6kg, water 910kg, sand 5510.6kg, 5-20mm cobblestone 3747.2kg、20-40mm cobblestone 3658.6kg、40-80mm cobblestone 4733.5kg、80-150mm cobblestone 4738.1kg, and the dosage of water reducing agent is 7.3kg.

Kinetostatic backflip strategy for self-recovery of quadruped robots with the selected rotation axis

Robotica ◽  
2021 ◽  
pp. 1-19
Author(s):  
Shengjie Wang ◽  
Kun Wang ◽  
Chunsong Zhang ◽  
Jian S Dai
Keyword(s):  
Optimal Design ◽  
Energy Analysis ◽  
Rotation Axis ◽  
Low Cost ◽  
Minimum Energy ◽  
Design Parameters ◽  
Quadruped Robots ◽  
Design Idea ◽  
The Relationship

Abstract A kinetostatic approach applied to the design of a backflip strategy for quadruped robots is proposed in this paper. Inspired by legged animals and taking the advantage of the leg workspace, this strategy provides an optimal design idea for the low-cost quadruped robots to achieve self-recovery after overturning. Through kinetostatic and energy analysis, a four-stepped backflip strategy based on the selected rotation axis with minimum energy is proposed, with a process of selection, lifting, rotating, and protection. The kinematic factors that affect the backflip are investigated, along with the relationship between the design parameters of the leg and trunk being analyzed. At the end of this paper, the strategy is validated by a simulation and experiments with a prototype called DRbot, demonstrating that the strategy endows the robot a strong self-recovery ability in various terrains.

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