Investigation on the glass fiber reinforced geopolymer concrete made of M-sand

This research work investigates the effect of utilization of glass fibers in geopolymer concrete made of Manufactured sand (M-sand) over its fresh and hardened properties and understand the influence of fibers over reducing the brittleness of the matrix. Geopolymer concrete synthesized in this study is Fly ash- GGBS blend type with optimum molarity cured under heat condition. Fresh property of the fiber reinforced geopolymer concrete was accessed using compaction factor test. Mechanical properties such as compressive strength, split tensile strength, flexural strength, impact strength, ductility factor, first crack toughness, failure crack toughness and ultimate failure toughness were measuredand their results are analyzed and discussed in this work. Later, SEM analysis was carried out over the optimum fiber reinforced geopolymer concrete samples to understand the bonding and the effectiveness of the fiber reinforced geopolymer concrete made of M-sand. Incorporation of glass fiber s proved to be more beneficial and yielded a hybrid concrete with increased strength properties. The performance of fiber s could be measured precisely in increasing the ductility and impact strength. Scanning Electron Microscopy (SEM) analysis showed better bonding between the fiber s and the matrix. This study unleashes an enormous scope for the practical implication of fiber reinforced geopolymer concrete as a building material

Expanded Fly Ash Clay Aggregate a Sustainable Alternative Coarse Aggregate for Concrete

Demand for natural aggregates in making concrete is increasing every day. Concrete is widely used in turnkey projects and small-scale projects. An alternative sustainable coarse aggregate for natural coarse aggregate can reduce the amount of pollution and preserve natural resource. An attempt is made in this research project to use locally available soil from the site and fly ash waste to prepare an alternative sustainable coarse aggregate for concrete to be used in small constructions. Concrete mix is prepared with natural aggregate and expanded fly ash clay aggregate EFCA and their fresh state, strength and durability properties were studied. The slump value of EFCA concrete under same water content is similar to that of natural aggregate concrete. A compressive strength of 21.45 MPa is achieved for EFCA concrete, which is acceptable for normal structural concrete. Flexural strength of 3.67 MPa is measured. Rapid chloride penetration test conducted on EFCA concrete showed moderate resistance to sulfate attack and a higher water penetration

Expanded Fly Ash Clay Aggregate a Sustainable Alternative Coarse Aggregate for Concrete

Demand for natural aggregates in making concrete is increasing every day. Concrete is widely used in turnkey projects and small-scale projects. An alternative sustainable coarse aggregate for natural coarse aggregate can reduce the amount of pollution and preserve natural resource. An attempt is made in this research project to use locally available soil from the site and fly ash waste to prepare an alternative sustainable coarse aggregate for concrete to be used in small constructions. Concrete mix is prepared with natural aggregate and expanded fly ash clay aggregate EFCA and their fresh state, strength and durability properties were studied. The slump value of EFCA concrete under same water content is similar to that of natural aggregate concrete. A compressive strength of 21.45 MPa is achieved for EFCA concrete, which is acceptable for normal structural concrete. Flexural strength of 3.67 MPa is measured. Rapid chloride penetration test conducted on EFCA concrete showed moderate resistance to sulfate attack and a higher water penetration

Expanded Fly Ash Clay Aggregate a Sustainable Alternative Coarse Aggregate for Concrete

Demand for natural aggregates in making concrete is increasing every day. Concrete is widely used in turnkey projects and small-scale projects. An alternative sustainable coarse aggregate for natural coarse aggregate can reduce the amount of pollution and preserve natural resource. An attempt is made in this research project to use locally available soil from the site and fly ash waste to prepare an alternative sustainable coarse aggregate for concrete to be used in small constructions. Concrete mix is prepared with natural aggregate and expanded fly ash clay aggregate EFCA and their fresh state, strength and durability properties were studied. The slump value of EFCA concrete under same water content is similar to that of natural aggregate concrete. A compressive strength of 21.45 MPa is achieved for EFCA concrete, which is acceptable for normal structural concrete. Flexural strength of 3.67 MPa is measured. Rapid chloride penetration test conducted on EFCA concrete showed moderate resistance to sulfate attack and a higher water penetration

EXPERIMENTAL INVESTIGATION ON FLOW THROUGH A CONFINED RECTANGULAR CHANNEL MOUNTED WITH SQUARE BLOCKS

Study on separated flow and step flow is subject of interest for many years for its wide industrial applications like cooling of electronic devices, heat exchangers, gas turbine components and other thermal equipments. Present experimental investigation is to report the influence of the block over rectangular channel in confined environment. Size of recirculation vortex, center of recirculation vortex for various Reynolds number with center to center distance between the blocks in the stream wise direction of the flow (Lx/Ly ratio) equal to 2, are the parameters reported when water is used as the working fluid. Outcome of this experimental study shows that, the size of the vortex increases with the increase of Reynolds number and the center of the vortex shifts in the direction of flow downstream of the blocks. Reynolds number considered for this study ranges from 800 to 1500 with a step of 100. Flow visualisation for the range of Reynolds number is presented

Effect of chemical treatment on physico-chemical properties of a novel extracted cellulosic Cryptostegia grandiflora fiber

© 2023 The Author(s). Published by IOP Publishing Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/The increasing global need to achieve sustainability in product development demands the use of biodegradable materials from renewable resources in many engineering applications. Accordingly, various natural fibers were explored as suitable reinforcement in polymer matrixes due to their low density and biodegradability. Hence, in this present work, a novel fiber reinforcement was extracted from the stem of the Cryptostegia grandiflora (CG) plant through a retting process and manual intervention. The extracted Cryptostegia grandiflora fibers(CGFs)were chemically treated using NaOH and silane. Various properties like crystal structure, chemical composition, surface morphology, and thermal degradation were studied using x-ray diffraction (XRD, Fourier transform infrared spectroscopy (FTIR) Scanning electron Microscopy (SEM) and Thermogravimetric analysis (TGA). The increasing cellulose content and the removal of hemicellulose after the chemical treatment indicate the potential for this CGfiber as a better reinforcement element in polymers. The increasing trend of tensile strength was observed for the CGfiber in the following order: silane > NaOH > untreated conditions. Two-stage thermal degradation was observed in all the cases where the maximum thermal degradation was found at the silane-treated CGfibers. Based on their performance, the chemically treated CGfibres can be made into composites and used for structural applications.Peer reviewe

Multi criteria decision making through TOPSIS and COPRAS on drilling parameters of magnesium AZ91

Magnesium (Mg) alloys are extensively used in the automotive and aircraft industries due to their prominent properties. The selection of appropriate process parameters is an important decision to be made because of the cost reduction and quality improvement. This decision entails the selection of suitable process parameters concerning various conflicting factors, so it has to be addressed with the Multiple Criteria Decision Making (MCDM) method. Therefore, this work addresses the MCDM problem through the TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) and COPRAS (COmplex PRoportional ASsessment) methods. The assessment carried out in the material Mg AZ91 with the Solid Carbide (SC) drill bit. The dependent parameters like drilling time, burr height, burr thickness, and roughness are considered with the independent parameters like spindle speed and feed rate. Drilling alternatives are ranked using the above said two methods and the results are evaluated. The optimum combination was found on the basis of TOPSIS and COPRAS for simultaneous minimization of all the responses which is found with a spindle speed of 4540 rpm and a feed rate of 0.076 mm/rev. The identical sequencing order was observed in TOPSIS and COPRAS method. The empirical model was developed through Box-Behnken design for each response. Superior empirical model developed for drilling time which is 3.959 times accurate than the conventional equation. The trends of various dependents based on the heterogeneity of various independents are not identical, these complex mechanisms are identified and reported. The optimized results of the Desirability Function Approach are greater accordance with the TOPSIS and COPRAS top rank. The confirmation results are observed with lesser deviation suggesting the selection of the above independent parameters

Performance of phosphoric acid doped polyaniline as electrode material for aqueous redox supercapacitor

970-978Phosphoric acid doped polyaniline has been synthesized chemically and electrochemically and tested for its specific capacitance properties by constructing a supercapacitor using stainless steel electrodes. Both the samples are characterized by UV-vis, FTIR, XRD and electrochemical methods. The electrochemically grown samples exhibit higher capacitance values in the range of 244-305 F/g. This is due to the higher purity of the electrochemically prepared polymer due to repeated cycling of the potential. Chemically prepared samples show lower capacitance values due to over-oxidation of the polymer and presence of impurities

Extraction and Characterization of Novel Natural Fiber from Cryptostegia Grandiflora as a Potential Reinforcement in Biocomposites

The significant environmental pollution caused by synthetic fibers drew researchers’ attention to the development of eco-friendly reinforcement for composite products. This study seeks to identify an alternative novel natural fiber from the Cryptostegia Grandiflora (CG) plant as a reinforcement material for bio composites. The fiber chemical compositions, X-ray diffraction, Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy, Thermo Gravimetric Analysis, and tensile test for single fiber are all examined. The fiber had a cellulose content of 79.20% and a crystallinity index of 62%. Thermo Gravimetric Analysis confirms that Cryptostegia Grandiflora fiber (CGF) can withstand temperatures as high as 230°C. It has a density of 1.02 g/cc and a tensile strength of 791 MPa on average. This novel Cryptostegia Grandiflora fiber will undoubtedly be used as reinforcement material in bio-composite materials