scholarly journals Appraisal on low cost and sustainable ECC using microfibers in hybridization at later age

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Maninder Singh ◽  
◽  
Babita Saini ◽  
H.D. Chalak ◽  
◽  
...  
Keyword(s):  
Low Cost ◽  
Research Work ◽  
Cost Effective ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Test Results ◽  
Industry Waste ◽  
Flexural Response ◽  
Pva Fiber ◽  
Durability Performance

The addition of supplementary cementitious materials and fiber plays an important role in the mechanical and durability performance of ECC matrix. In the present research work, the assessment of the performance of ECC matrix with the utilization of iron industry waste and microfibers has been done. Three types of microfibers, i.e., polyvinyl alcohol (PVA) fiber, polyester (PET) fiber, and microsteel (MSE) fiber, were used at various percentages in hybridization to prepare total seven mixes. First, PVA was switched by PET fiber at dosages 5%, 10%, 15%, 20%,and 25% and afterwards another 25% by MSE fiber. The performance of various matrix proportions was judged based on the flexural response, electrical resistivity, air permeability, and sorptivity characteristics to introduce sustainable and cost effective ECC matrix. Test results revealed that hybridization of fibers enhanced the flexural and durability performance of ECC and also produced a cost effective and sustainable ECC matrix.

scholarly journals A Study on the Strength Aspects of Concrete with Metakaolin, GGBFS and Rice Husk Ash as Partial Replacement of OPC

2021 ◽  
Vol 889 (1) ◽  
pp. 012072
Author(s):  
Amit Sharma ◽  
Sanjeev Gupta
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Research Work ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Engineering Properties ◽  
Partial Replacement ◽  
Test Results ◽  
Conventional Concrete ◽  
The Impact

Abstract The impact of the OPC on the environment is important as its production generates a large amount of CO2. In order to reduce the use of pure raw materials as resources, the use of industrial waste or secondary materials in construction sites for the production of cement and concrete has been encouraged. The volume of wastes generated worldwide has increased over the years due to the population, social and economic performance and social development. One of the most attractive options for waste management is to minimize waste and reuse the possibility of recycling. The cost of cement used in concrete works is increasing and unsatisfactory, but the demand for this material and other housing needs is rising, so it is important to find alternatives that can be used alone or in a partial replacement. In this research work several auxiliary cementitious ingredients such as metakaoline, GGBFS and Rice Husk Ash (RHA) were used to improve the strength properties of the conservative concrete. Metakaolin and GGBFS was used at a fixed percentage of 10 percent as fractional substitution of the OPC-43 grade cement, while the RHA was used at different percent ranging from 0 to 25 percent at an increment of 5 percent in each case as fractional substitution of the OPC-43 grade cement. Numerous examinations were executed so as to envisage the effect of these materials over the strength and engineering properties of the concrete. The test results conclude that the usage of the metakaolin, GGBFS and the RHA in combined form increased the strength and engineering properties of the conventional concrete up to a great extent. From the obtained test results it can be further concluded that the particle size of the supplementary cementitious materials plays a significant role in enhancing the internal micro-structure of the concrete and which further leads to the higher strength of the concrete. Also the main reason behind the advanced strength was the presence of the metakaolin and GGBFS in the concrete, whose chemical properties densifies the concrete and made the concrete more stable and promotes higher strength. Future work can also be done on the usage of several other supplementary cementitious materials at different other percentages so as to improve concrete properties.

scholarly journals Static Hardness Testing of Cement Mortars Containing Different Types of Recycled Construction Waste Powders

Solids ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 331-340
Author(s):  
Zoltán Gyurkó ◽  
Rita Nemes
Keyword(s):  
Compressive Strength ◽  
Indentation Test ◽  
Hardness Test ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Test Results ◽  
Depth Sensing ◽  
Static Hardness ◽  
Cement Mortars ◽  
Aerated Concrete

The present paper deals with the hardness of cement mortars prepared with recycled materials that are potential supplementary cementitious materials (SCM). Two potential SCMs (aerated concrete powder (ACP) and concrete powder) were investigated and compared with a reference (neat cement) sample and a sample containing metakaolin (MK). The long-term performance of the mortars was studied up to the age of one year. Based on the compressive strength tests at different ages, neither concrete powder nor ACP significantly decreases the compressive strength at a 10% substitution ratio. The samples were studied with two types of static hardness tests: the Brinell hardness test and the depth sensing indentation test at two different load levels. The hardness test results indicated that the standard deviation of the results is lower at a higher load level. In the case of metakaolin and concrete powder, the change in the compressive strength was observable in the hardness test results. However, in case of the ACP, the compressive strength decreased, while the hardness increased, which can be traced back to the filler effect of aerated concrete powder. Finally, using the DSI test, the hardness results were analyzed on an energy basis. The analysis highlighted that the change in the hardness is connected to the elastic indentation energy, while it is independent from the dissipated (plastic) indentation energy.

scholarly journals Compressive and Flexural Strength Property Enhancement for Fibre Reinforced Standard Concrete (FRSC), High Strength Concrete (FRHSC) and High Performance Concrete (FRHPC) using Foundry Sand (FS) and Crushed Concrete Waste (CCW)

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Pruthviraj S R ◽  
Ravi Kumar C M ◽  
Yajnodbhavi H M ◽  
Maruthi T ◽  
Raghavendra S
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Specific Test ◽  
Foundry Sand ◽  
Crushed Concrete

Now days, many research works are carried for all grades of concrete to make the concrete most economical and durable there by adding the supplementary cementitious materials and alternative replacement aggregates. In this research work deals with the experimental investigation of mechanical properties of the M30, M50 and M80 grade concrete by replacing the fine and coarse aggregate by foundry sand and crushed concrete waste respectively. Mix design procedures were followed as per IRC44:2017 guidelines and recommendation. Proper dosage of super plasticizer (SP) was maintained in the concrete to make it better performed. In this present investigation, a Poly Propylene fibre (PPF) of 0.3% by weight of the cement is used. Mechanical properties such as Compressive strength and Flexural Strength were determined by preparing the respective mould sizes for specific test and are cured for 7, 14 and 28 days and result obtained for respective days were tabulated and discussed.  

scholarly journals Effectiveness of agricultural wastes in soil stabilization.

2021 ◽  
Vol 10 (1) ◽  
pp. 14
Author(s):  
Deborah Dauda ◽  
Manju Dominic
Keyword(s):  
Waste Disposal ◽  
Soil Stabilization ◽  
Expansive Soils ◽  
Agricultural Waste ◽  
Cost Effective ◽  
Cementitious Materials ◽  
Agricultural Wastes ◽  
Supplementary Cementitious Materials ◽  
Concrete Production ◽  
The Cost

Many ways have been sought to improve soils, especially expansive soils which have been problematic to structures and pavements built over them and soil stabilization seems to be one of the effective ways. But soil stabilization in itself is not cost-effective hence the introduction of agricultural wastes being researched on and seen as a cheaper means to be used as stabilizing agents which helps in minimizing the cost of soil stabilization, thereby reducing the problem of waste disposal. Agricultural wastes like Rice Husk Ash, Bagasse Ash, Sugarcane Straw Ash, Saw Dust Ash, Coconut Husk Ash, Millet Husk Ash, Corn Cob Ash, Locust Bean Pod Ash, Cassava Peel Ash and Bamboo Leaf Ash have been experimented with in stabilizing soils and as well, serving as supplementary cementitious materials for cement in concrete production. The strengths of the soils and the concrete stabilized with these wastes were seen to improve significantly and their effectiveness was estimated based on an average optimum value. Agricultural waste processing Industries can be set up to help in the massive production of these natural stabilizers which would lessen the cost of soil stabilization using cement and chemicals and also generally reduce problems that are associated with waste disposal, helping in waste management.  Keywords—expansive soils, soil stabilization, agricultural wastes

scholarly journals Fresh/Mechanical/Durability Properties and Structural Performance of Enginnered Cementitious Composite (ECC)

2021 ◽  
Author(s):  
Maulin Bipinchandra Mavani
Keyword(s):  
Fly Ash ◽  
Experimental Studies ◽  
Cost Effective ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Small Scale ◽  
Cementitious Composite ◽  
Durability Properties ◽  
Bridge Structures ◽  
Stud Shear Connector

Engineered Cementitious Composite (ECC) is an ultra ductile concrete with strain-hardening and multiple-cracking behaviour in tension and flexure. Fresh, mechanical and durability properties of different ECC mixtures are evaluated by incorporating supplementary cementitious materials (class F, CI fly ash and slag) and different aggregate type. Experimental studies demonstrated viability of producing greener, sustainable and cost-effective ECC using locally available aggregates (crushed sand) instead of microsilica sand and fly ash (Class CI or F) of up to 70% cement replacement having similar or better fresh, mechanical and durability properties. Structural validation by small scale tests on bridge decks with ECC link slab and by push out tests to evaluate stud shear connector-ECC interaction compared with self-consolidating concrete (SCC) proved feasibility and advantages of these ECC mixes. Based on research, recommendations are made for ECC mix design and their application in link slab construction in bridge structures.

The Benefit and Importance of Mobile Satellite Signal in Northern Nigeria: GPS Approach

2021 ◽  
Vol 02 (02) ◽  
Author(s):  
Ibrahim Abba ◽  
◽  
Salisu Muhammad ◽  
Lawan Bashir D. Bala ◽  
Emmanuel Joseph ◽  
...  
Keyword(s):  
Open Space ◽  
Low Cost ◽  
Research Work ◽  
Cost Effective ◽  
Signal Propagation ◽  
Space Environment ◽  
Gps Receiver ◽  
Satellite Signal ◽  
Mobile Satellite ◽  
Set Up

Lack of equipment to study mobile satellites signal propagation in colleges and universities prone this research work. A Handheld GPS receiver used as a tool for training college students to learn mobile satellite signal propagation using Global Positioning System (GPS) approach. These refer to the experimental setup of the equipment that is the connection done between the GPS receiver with a computer. The satellite propagation data received from the GPS machine can be recorded continuously with an updates rate of 2 seconds. The experiment was carried out in an open space environment at predetermine locations using simple setup, where a cheap, readily and available portable GPS receiver were connected to the computer to acquire propagation data. The computer was equipped with a self-developed package graphical user interface (GUI) monitoring the propagation information from the GPS satellites and saving the data. The developed system can be set up anywhere at any location. The sate-up will serve as a database for satellites view and analysis of mobile satellite data orbiting the sky of Northern part of Nigeria. Cost effective referring to a low-cost and readily available GPS receiver that can be easily set-up as compared to equipment designed specifically for an experimental purpose that is normally very expensive.

A Novel Low Cost Package for Radio Frequency Applications

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Sandeep Chaturvedi ◽  
Shiban K. Koul
Keyword(s):  
High Frequency ◽  
Printed Circuit Board ◽  
Low Cost ◽  
Cost Effective ◽  
Circuit Board ◽  
Test Results ◽  
Printed Circuit ◽  
Pcb Manufacturing ◽  
Manufacturing Techniques ◽  
Commercial Applications

Design, fabrication, and test results of a novel 3-layer RF package using a commonly available high frequency laminate are presented in this paper. The developed package can be manufactured using standard multilayer printed circuit board (PCB) manufacturing techniques making it cost effective for commercial applications. The package exhibits excellent RF characteristics up to 6 GHz.

Development and validation of a low-cost mobile robotics testbed

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Michael Johnson ◽  
Martin Hayes
Keyword(s):  
Real Time ◽  
Mobile Robotics ◽  
Vision System ◽  
Tracking System ◽  
Low Cost ◽  
Research Work ◽  
Cost Effective ◽  
Video Tracking ◽  
Research And Education ◽  
Development And Validation

AbstractThis paper considers the design, construction and validation of a low-cost experimental robotic testbed, which allows for the localisation and tracking of multiple robotic agents in real time. The testbed system is suitable for research and education in a range of different mobile robotic applications, for validating theoretical as well as practical research work in the field of digital control, mobile robotics, graphical programming and video tracking systems. It provides a reconfigurable floor space for mobile robotic agents to operate within, while tracking the position of multiple agents in real-time using the overhead vision system. The overall system provides a highly cost-effective solution to the topical problem of providing students with practical robotics experience within severe budget constraints. Several problems encountered in the design and development of the mobile robotic testbed and associated tracking system, such as radial lens distortion and the selection of robot identifier templates are clearly addressed. The testbed performance is quantified and several experiments involving LEGO Mindstorm NXT and Merlin System MiaBot robots are discussed.

scholarly journals Sustainability Levels in Comparison with Mechanical Properties and Durability of Pumice High-Performance Concrete

2021 ◽  
Vol 11 (11) ◽  
pp. 4964
Author(s):  
Kristýna Hrabová ◽  
Petr Lehner ◽  
Pratanu Ghosh ◽  
Petr Konečný ◽  
Břetislav Teplý
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cost Effective ◽  
Cementitious Materials ◽  
Sustainability Indicators ◽  
Supplementary Cementitious Materials ◽  
Evaluation Procedure ◽  
Sustainable Performance ◽  
Diffusion Parameters ◽  
Bridge Deck Slabs

In the production of cement and concrete, mechanical and durable properties are essential, along with reasonable cost and sustainability. This study aimed to apply an evaluation procedure of the level of sustainability of mixtures of high-performance concretes (HPC) with various eco-friendly supplementary cementitious materials (SCM). The major supplementary cementitious materials (SCMs), namely, volcanic pumice pozzolan (VPP), Class C and F fly ash, ground granulated blast furnace slag of grade 120, silica fume, and metakaolin, were included. Twenty-seven concrete mixtures were analyzed using a previously presented comprehensive material sustainability indicator in a cost-effective variant. The results indicated that the rank of the concretes differed at 28, 56, and 91 days after concreting. In addition, the study showed no correlation of strength and diffusion parameters with sustainability indicators. Finally, this study will contribute to the optimal selection of mixtures of HPC with VPP in terms of sustainability, cost, and durability for future implementation in reinforced concrete bridge deck slabs and pavements. The values of sustainability indicators for pumice-based mixtures were compared with those for other SCMs, highlighting the sustainable performance of volcanic ash-based SCM.

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