scholarly journals REDUCTION OF CEMENT CONSUMPTION BY THE AID OF SILICA NANO-PARTICLES (INVESTIGATION ON CONCRETE PROPERTIES)

2012 ◽  
Vol 18 (3) ◽  
pp. 416-425 ◽  
Author(s):  
Hadi Bahadori ◽  
Payam Hosseini
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Physical And Mechanical Properties ◽  
Strength Loss ◽  
Experimental Results ◽  
Nano Particles ◽  
Hardened Concrete ◽  
Absorption Test ◽  
Concrete Properties ◽  
Water Absorption Test

In this study, effects of replacing cement with colloidal amorphous silica nano-particles have been experimentally investigated on the physical and mechanical properties, durability and microstructure of concrete. Experimental results include workability, fresh concrete density, and hardened concrete properties like compressive strength at different ages of 3, 7, and 28-days, and also 28-days splitting tensile strength. Furthermore, influence of silica nano-particles on durability and microstructure of concrete for 28-days specimens was tested by conducting water absorption test, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Analysis (EDAX), respectively. In order to study the effect of replacement of cement with silica nano-particles, specimens with 10%, 20%, and 30% cement reduction, and addition of 1%, 2%, and 3% silica nano-particles with respect to witness specimen were fabricated. Experimental results revealed that 20% reduction of cement combining 2% silica nano-particles and also 10% cement reduction combined with 1% silica nano-particles enhance the microstructure of concrete, despite unnoticeable compressive and tensile strength loss. By remarkable reduction of cement consumption and addition of silica nano-particles, strength almost remains constant and consequently decreasing the cement content will become possible. Also, in all specimens, increase in nano-particles content and decrease in cement usage contributed to workability loss. Therefore, applying super-plasticizers seems indispensible while using silica nano-particles. On the other side, according to water absorption test, concretes containing nanoparticles showed more appropriate durability.

scholarly journals Thermal Action on Normal and High Strength Cement Mortars

2020 ◽  
Vol 10 (18) ◽  
pp. 6455
Author(s):  
Marianela Ripani ◽  
Hernán Xargay ◽  
Ignacio Iriarte ◽  
Kevin Bernardo ◽  
Antonio Caggiano ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Peak Load ◽  
Physical And Mechanical Properties ◽  
Thermal Action ◽  
High Strength ◽  
Strength Loss ◽  
Brittle Behavior ◽  
Cement Mortars ◽  
Water Absorption Test

High temperature effect on cement-based composites, such as concrete or mortars, represents one of the most important damaging process that may drastically affect the mechanical and durability characteristics of structures. In this paper, the results of an experimental campaign on cement mortars submitted to high temperatures are reported and discussed. Particularly, two mixtures (i.e., Normal (MNS) and High Strength Mortar (MHS)) having different water-to-binder ratios were designed and evaluated in order to investigate the incidence of both the mortar composition and the effects of thermal treatments on their physical and mechanical properties. Mortar specimens were thermally treated in an electrical furnace, being submitted to the action of temperatures ranging from 100 to 600 °C. After that and for each mortar quality and considered temperature, including the room temperature case of 20 °C, water absorption was measured by following a capillary water absorption test. Furthermore, uniaxial compression, splitting tensile and three-points bending tests were performed under residual conditions. A comparative analysis of the progressive damage caused by temperature on physical and mechanical properties of the considered mortars types is presented. On one hand, increasing temperatures produced increasing water absorption coefficients, evidencing the effect of thermal damages which may cause an increase in the mortars accessible porosity. However, under these circumstances, the internal porosity structure of lower w/b ratio mixtures results much more thermally-damaged than those of MNS. On the other hand, strengths suffered a progressive degradation due to temperature rises. While at low to medium temperatures, strength loss resulted similar for both mortar types, at higher temperature, MNS presented a relatively greater strength loss than that of MHS. The action of temperature also caused in all cases a decrease of Young’s Modulus and an increase in the strain corresponding to peak load. However, MHS showed a much more brittle behavior in comparison with that of MNS, for all temperature cases. Finally, the obtained results demonstrated that mortar quality cannot be neglected when the action of temperature is considered, being the final material performance dependent on the physical properties which, in turn, mainly depend on the mixture proportioning.

Study on Characterization of Hardened Concrete from Water Absorption-Time Curve

2006 ◽  
Vol 302-303 ◽  
pp. 500-507 ◽  
Author(s):  
Eitou Kyo ◽  
Goro Shimizu
Keyword(s):  
Water Absorption ◽  
Weight Change ◽  
Hardened Concrete ◽  
Absorption Test ◽  
Test Results ◽  
Time Curve ◽  
Testing Method ◽  
Water Absorption Test ◽  
The Relationship

The characterization of hardened concrete was analyzed by testing the weight change of water absorption. A simple testing method is submitted and discussed in this paper. As one of the test results, it was reported that the relationship between weight change (at) and time (t) of water absorption test would be well fitted with at=(α×t)/(β+t). Based on the result, laboratory studies of a water absorption test were carried out. Test results were discussed for estimation of mix proportions, compressive strength, and carbonation of different kinds of concrete.

scholarly journals Exploring the Properties of Mortar Containing Incineration Fly Ash

2021 ◽  
Vol 920 (1) ◽  
pp. 012041
Author(s):  
N M Ibrahim ◽  
R Abdul Malek ◽  
N L Rahim ◽  
M Abdul Rahim ◽  
R Che Amat ◽  
...  
Keyword(s):  
Fly Ash ◽  
Water Absorption ◽  
Physical And Mechanical Properties ◽  
Pulse Velocity ◽  
Hazardous Substances ◽  
Partial Replacement ◽  
Absorption Test ◽  
Environmental Destruction ◽  
Water Absorption Test ◽  
Potential Use

Abstract Fly Ash (FA) is one of the waste materials generated from the combustion of solid waste through incinerator and contains hazardous substances. Further treatment to the ash needs to be done to avoid further environmental destruction. As an alternative solution for this problem, FA is used as a replacement material for cement in the mortar. The main objective of this study is to explore the potential use of FA as partial replacement of cement in mortar. The percentage of FA used to replace the cement in this study is 0%, 5%, 10%, 15% and 20%. Several important tests were conducted to identify main properties of the mortar such as compressive strength, water absorption, density and ultra-pulse velocity. Mortar containing 15% of fly ash has the highest of compression strength which is 35 MPa after 28 days. Besides, the mortar containing 5% of fly ash has the highest result of water absorption test and density test whereas mortar containing 20% of fly ash has the highest value for pulse velocity after 28 days. Thus, mortar containing fly ash has good physical and mechanical properties.

scholarly journals Permeability and Tensile Strength of Concrete with Arabic Gum Biopolymer

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Abdeliazim Mustafa Mohamed ◽  
Mohd Hanim Osman ◽  
Hichem Smaoui ◽  
Mohd Azreen Mohd Ariffin
Keyword(s):  
Tensile Strength ◽  
Physical And Mechanical Properties ◽  
Wild Plant ◽  
Building Industry ◽  
Hardened Concrete ◽  
Construction Sector ◽  
African Countries ◽  
Arabic Gum ◽  
Concrete Properties ◽  
Effective Additive

The use of materials of vegetal origin is increasingly being promoted in many industries due to their cost effectiveness and the rising sensitivity to environmental protection and sustainability. Arabic Gum Biopolymer (AGB) is a wild plant byproduct that is abundantly found in Sudan and is also produced in other African countries. It has long been used in various industries. However, its utilization is very limited in the construction sector although there appears to be a significant potential for use of AGB in the building industry. As an example, there is evidence that AGB may be an effective additive to concrete mixes that would improve fresh and hardened concrete properties. The aim of the present work is to provide further experimental evidence on the improvement that can be achieved in the physical and mechanical properties of hardened concrete when AGB is added to the mixture. The experimental results show a significant reduction in permeability for an optimum percentage of AGB and an increase in flexural and tensile strength and in the elastic modulus.

The Usage of Glass Waste as Cement Replacement

2016 ◽  
Vol 673 ◽  
pp. 95-104 ◽  
Author(s):  
Aeslina Abdul Kadir ◽  
Mohamad Rosli Ismail ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Noor Amira Sarani ◽  
Mohd Ikhmal Haqeem Hassan
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Glass Powder ◽  
Physical And Mechanical Properties ◽  
Concrete Mixture ◽  
Powder Size ◽  
Absorption Test ◽  
Glass Waste ◽  
Water Absorption Test ◽  
Growth Production

The growth production and manufactured sector in Malaysia had led to increase the industrial by-product waste especially glass. These growing problems of glass waste can be reduced if new disposal method are utilized other than disposed it to the landfill. This study is focused on the utilization of glass waste with cement. The main objectives of this study are to determine the characteristics of glass waste and to conduct physical and mechanical properties test towards the concrete with different percentages of glass (10%, 20% and 30%). Samples of glass waste were collected and crushed to the powder size (40µm) before being mix in concrete mixture and their characteristics were determined by using X-Ray Fluorescent (XRF). Physical and mechanical properties include compressive strength, water absorption and density were tested. The results obtained demonstrated that, only sample with 10% of glass powder incorporated is complied with the minimum strength of the cube with 25.6MPa. However, all of the samples meet the minimum value for density and water absorption test. The density obtained is still in the range which is between 2116.1kg/m3 until 2239.4kg/m3. As for water absorption test, all of the samples obtained the value below than 6% and can be classified as a good concrete. As a conclusion, 10% of glass powder is the most suitable percentage to be incorporated into concrete mixture. This replacement could be an alternative disposal method to glass waste.

Effect of water absorption on mechanical and tribological properties of Indian ramie/epoxy composites

2021 ◽  
pp. 135065012110056
Author(s):  
Rajiv Kumar ◽  
Mir I Ul Haq ◽  
Sanjay M Sharma ◽  
Ankush Raina ◽  
Ankush Anand
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Impact Strength ◽  
Water Absorption ◽  
Epoxy Composites ◽  
Absorption Test ◽  
Mechanical And Tribological Properties ◽  
Water Absorption Test ◽  
Scanning Electron

In the present work, the water absorption behaviour of Indian ramie/epoxy composites and its effect on mechanical and tribological behaviour have been investigated. The composites fabricated using the hand layup technique were immersed in distilled water at room temperature for water absorption test for a period of 120 days. Mechanical and tribological properties were evaluated for composites with 30 wt.% ramie fibre loading. The results obtained were compared with that of the dry specimen. Mechanical properties including tensile strength, flexural strength, impact strength and hardness were evaluated. A reduction of 16.85%, 13.63%, 21.02% and 3.33% in tensile strength, flexural strength, impact strength and hardness was observed after the water immersion, respectively. Friction and wear behaviour was also investigated for water immersed specimen. Frictional coefficient decreased for the developed composites and wear performance reduced after the water absorption test. Fractured surfaces post to mechanical testing and worn out surfaces of tribological test samples were examined by scanning electron microscopy. The weakening of fibre–matrix interface was observed in the scanning electron microscopy micrographs, which appears to be the main cause for the degradation of properties.

scholarly journals MECHANICAL AND PHYSICAL PROPERTIES OF THERMOPLASTIC CORN STARCH

2021 ◽  
Vol 83 (5) ◽  
pp. 119-127
Author(s):  
Nazri Huzaimi Zakaria ◽  
Ridhwan Jumaidin ◽  
Mohd Adrinata Shaharuzaman ◽  
Mohd Rody Mohamad Zin ◽  
Fudhail Abdul Munir
Keyword(s):  
Tensile Strength ◽  
Moisture Content ◽  
Physical Properties ◽  
Water Absorption ◽  
Corn Starch ◽  
Absorption Test ◽  
Physical Test ◽  
Biodegradable Composite ◽  
Mechanical And Physical Properties ◽  
Water Absorption Test

The awareness to produce biodegradable composite has increased rapidly because of non-toxic and reachable. However, fully biodegradable composite production still low due to the matrix used in the composite is not biodegradable. Thus, this paper presents the study on mechanical and physical properties for the mixtures of corn starch (CS) with different weight percentages of glycerol as thermoplastics corn starch (TPCS) matrix. The selected glycerol contents were at 30, 35 and 40 wt%. The mixtures of CS and different weight percentages of glycerol were made using hot compression moulding at 165°C for 15 minutes to produce the TPCS samples. The mechanical and physical properties were done: the tensile test, hardness test, water absorption test, moisture content test and microstructure analysis under the Scanning Electron Microscopes (SEM). Incorporating 30 wt% loadings of glycerol has increased the tensile strength and hardness. The results show that the addition of higher than 30 wt% loadings of glycerol has decreased the tensile strength and hardness of the TPCS. The physical test results for 30 wt% loadings of glycerol for water absorption test and moisture content show the lowest value than other TPCS samples. However, the density value for all wt% loadings of glycerol does not offer much difference. It reveals that 30 wt% loadings of glycerol in the mixture of CS have shown a good interaction in the TPCS mechanical properties. Based on this finding, the TPCS has huge potential to be used as a matrix to develop a fully biodegradable composite.

scholarly journals Chitosan succinate/PVA-PEG Membrane: Preparation, Characterization and Permeation Ability Test on Creatinine

2018 ◽  
Vol 21 (2) ◽  
pp. 80-84 ◽  
Author(s):  
Retno Ariadi Lusiana ◽  
Vivi Dia Ahmad Sangkota ◽  
Sri Juari Santosa
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Poly Vinyl Alcohol ◽  
Inversion Method ◽  
Ability Test ◽  
Chitosan Membrane ◽  
Water Absorption Test ◽  
Poly Ethylene ◽  
Membrane Strain ◽  
Phase Inversion Method

Evaluation character of chitosan membrane-succinate / poly vinyl alcohol-poly ethylene glycol (PVA-PEG) were prepared in acetic acid solvent through a phase inversion method has been performed. The study began with the preparation of crosslinked chitosan compounds with succinic acid, followed by preparation into membrane by combining PVA-PEG. Character analysis of the resulting material using FTIR, EDX, TGA, water absorption test, tensile strength, membrane hydrophilicity. The ability of membrane permeation was tested against creatinine. The results showed that the succinate had reacted with chitosan. Chitosan modification through cross link and polymer alloys increases tensile strength and membrane strain of 1.7-2.5 x of pure chitosan membrane. In addition, the modified membrane also has higher water absorption and hydrophilicity values than the unmodified membrane, and this implies the ability of membrane-induced creatinine permeation. Permeable permeation values were 13.8% in chitosan, 24.84% on chitosan-succinate and 25% in chitosan-succinate / PVA-PEG. Chitosan-succinate membranes have the ability to use more than 4x repeated use.

scholarly journals CHARACTERISTICS OF PHYSICAL PROPERTIES OF WOOD POWDER COMPOSITES AND BAGASSEAS CONSTRUCTION MATERIALS OF SHIP

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Ersti Yulika Sari ◽  
Polaris Nasution ◽  
Fajri Ramdhan1
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Construction Materials ◽  
Absorption Test ◽  
Wood Powder ◽  
Powder Composites ◽  
Density Values ◽  
Water Absorption Test ◽  
Composite Wood

Parameters for measuring the physical properties on this research are divided into three elements, including measurement of weight, water absorption, and density. This research was conducted from January to March 2018 to determine the physical properties of wood powder composites and bagasse. The manufacturing and testing process refers to the ASTM and JIS standards. Weight and density testing refer to the ASTM D 792 standard while the water absorption test refers to the JIS A5908 standard. The results showed that the density of wood powder was 0.4175 gr / cm3, and the bagasse was 0.3125 gr / cm3. Then, fiber absorption in units of volume to water and resin were 16.88% and 13.75% respectively. The results showed that the largest water absorption was found in composite wood powder 60% and bagasse 40%, which was 13.47%, and for the highest density values found in wood powder composites as much as 80% or 1,078.29 kg / m3

Studies on Tensile and Water Absorption Properties on Kenaf (Hibiscus Cannabinus) Fibre Mat/Polyester Composite Using Chemical Treatment

2013 ◽  
Vol 421 ◽  
pp. 290-295
Author(s):  
Mohammad Taib Mohamad Nurul Azman ◽  
Abu Kassim Masitah ◽  
Ariff Jamaludin Mohd ◽  
Ismail Tayibbah
Keyword(s):  
Water Absorption ◽  
Treatment Duration ◽  
Hibiscus Cannabinus ◽  
Absorption Test ◽  
Duration Of Treatment ◽  
Absorption Properties ◽  
Kenaf Fibre ◽  
Polyester Composite ◽  
Water Absorption Test ◽  
Polyester Composites

This research investigated the tensile and water absorption properties of kenaf fibre mat/polyester composites. Treatment using acetylation method has been introduced to improve the properties of product manufactured. The effects of acetylation treatment with three variations of time that were 1, 4 and 24 hours on the kenaf fibre mats were investigated. The MOE of the tensile of treated fibre mat/polyester composite for 1 hour was the highest with value 4589.61 MPa. The tensile strength of treated fibre mat/polyester composite for 4 hours was the highest with value 0.6213 MPa. For water absorption test, the results showed that fibre mat/polyester composite with treatment duration for 1 hour had the lowest water absorption that was 1.23% compared with treatment duration for 4 hours and 24 hours. For overall it can be concluded that the treatment duration of 1 hour was recommended for acetylation method when compared with 4 hours and 24 hours duration treatments. Using acetylation treatment on the kenaf fibre mat/polyester composites was showed improvement on composite and was recommended in short duration of treatment.

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