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.

scholarly journals The Compressive Strength of Concrete Containing Eggshell Powder and Palm Oil Fuel Ash Cured in Tap Water and River Water

2019 ◽  
Vol 3 (1) ◽  
pp. 24-29
Author(s):  
Mazizah Ezdiani Mohamad ◽  
Keyword(s):  
Compressive Strength ◽  
River Water ◽  
Palm Oil ◽  
Tap Water ◽  
Palm Oil Fuel Ash ◽  
Concrete Mixtures ◽  
Structural Applications ◽  
Concrete Production ◽  
Fuel Ash ◽  
Oil Fuel

Cement production is a major environmental problem that causes the release of carbon dioxide into the atmosphere. This study attempts to sustainably use palm oil fuel ash (POFA) and eggshell powder (ESP) as partial replacements for Ordinary Portland cement (OPC) in concrete production. POFA and ESP are two wastes that need to be managed to reduce their detrimental environmental effects. As such compressive and slump tests were conducted on POFA-ESP-OPC concrete mixtures by replacing 10% of OPC with POFA-ESP. Two mediums of curing were used: tap water and river water. It was found that the compressive strength and slump resistance of these mixtures were within the ranges typically encountered in regular concrete mixtures indicating the viability of this procedure employed for structural applications.

scholarly journals Partial Replacement of Coarse Aggregate by using Recycled Aggregate

2019 ◽  
Vol 8 (12S) ◽  
pp. 1093-1095
Keyword(s):  
Developing Countries ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Conventional Concrete ◽  
Concrete Mixtures ◽  
Selection Of

The high and rapidly rising cost of cement has made construction expensive in developing countries where cement is commonly used. Tests were conducted in this undertaking research with the selection of necessary materials and information required for the configuration of the blend is collected. Cubes and cylinders were casted with these concrete mixtures and subjected to 7-day, 14-day and 28-day healing and determining their strength. The determined compressive strength and spilt tensile strength was compared with the conventional concrete for percentage replacements of (0%,5%,10%,15%).

scholarly journals Palm Oil Fuel Ash (POFA) and Eggshell Powder (ESP) as Partial Replacement for Cement in Concrete

2018 ◽  
Vol 34 ◽  
pp. 01004 ◽  
Author(s):  
Mazizah Ezdiani Mohamad ◽  
Ali A. Mahmood ◽  
Alicia Yik Yee Min ◽  
Nur Nadhira A.R.
Keyword(s):  
Compressive Strength ◽  
Palm Oil ◽  
Partial Replacement ◽  
Palm Oil Fuel Ash ◽  
Concrete Mixtures ◽  
Replacement Procedure ◽  
Mix Proportion ◽  
Structural Applications ◽  
Fuel Ash ◽  
Oil Fuel

This study is an attempt to partially replace Ordinary Portland cement (OPC) in concrete with palm oil fuel ash (POFA) and eggshell powder (ESP). The mix proportions of POFA and ESP were varied at 10% of cement replacement and compared with OPC concrete as control specimen. The fineness of POFA is characterized by passing through 300 μm sieve and ESP by passing through 75 μm sieve. Compressive strength testing was conducted on concrete specimens to determine the optimum mix proportion of POFA and ESP. Generally the compressive strength of OPC concrete is higher compared to POFA-ESP concrete. Based on the results of POFA-ESP concrete overall, it shows that the optimum mix proportion of concrete is 6%POFA:4% ESP achieved compressive strength of 38.60 N/mm2 at 28 days. The compressive strength of OPC concrete for the same period was 42.37 N/mm2. Higher water demand in concrete is needed due to low fineness of POFA that contributing to low compressive strength of POFA-ESP concrete. However, the compressive strength and workability of the POFA-ESP concrete were within the ranges typically encountered in regular concrete mixtures indicating the viability of this replacement procedure for structural and non-structural applications.

ALCOA 2026

Alloy Digest ◽  
2006 ◽  
Vol 55 (10) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Selection Criteria ◽  
Damage Tolerance ◽  
Structural Applications ◽  
Extrusion Alloy ◽  
High Degree

Abstract Alcoa extrusion alloy 2026 was developed as an improvement over 2024 and 2224 extrusions in aerospace structural applications where the governing selection criteria are high damage tolerance, good fatigue resistance, and a high degree of manufacturability. In addition to improved damage tolerance, extrusion alloy 2026-T3511 also has a significantly higher A-basis minimum strength than 2024-T3511 and 2224-T3511. This datasheet provides information on composition, tensile properties, and compressive strength as well as fatigue. It also includes information on corrosion resistance as well as forming. Filing Code: AL-401. Producer or source: AEAP-Alcoa Engineered Aerospace Products.

scholarly journals Undergraduate Research Program to Recycle Composite Waste

2021 ◽  
Vol 11 (7) ◽  
pp. 354
Author(s):  
Waleed Ahmed ◽  
Essam Zaneldin ◽  
Amged Al Hassan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Undergraduate Students ◽  
Research Program ◽  
Modulus Of Elasticity ◽  
Undergraduate Research ◽  
Undergraduate Research Program ◽  
Structural Applications ◽  
Cfrp Composite

With the rapid growth in the manufacturing industry and increased urbanization, higher amounts of composite material waste are being produced, causing severe threats to the environment. These environmental concerns, coupled with the fact that undergraduate students typically have minimal experience in research, have initiated the need at the UAE University to promote research among undergraduate students, leading to the development of a summer undergraduate research program. In this study, a recycling methodology is presented to test lab-fabricated Carbon-Fiber-Reinforced Polymer (CFRP) for potential applications in industrial composite waste. The work was conducted by two groups of undergraduate students at the UAE University. The methodology involved the chemical dissolution of the composite waste, followed by compression molding and adequate heat treatment for rapid curing of CFRP. Subsequently, the CFRP samples were divided into three groups based on their geometrical distinctions. The mechanical properties (i.e., modulus of elasticity and compressive strength) were determined through material testing, and the results were then compared with steel for prompt reference. The results revealed that the values of mechanical properties range from 2 to 4.3 GPa for the modulus of elasticity and from 203.7 to 301.5 MPa for the compressive strength. These values are considered competitive and optimal, and as such, carbon fiber waste can be used as an alternate material for various structural applications. The inconsistencies in the values are due to discrepancies in the procedure as a result of the lack of specialized equipment for handling CFRP waste material. The study concluded that the properties of CFRP composite prepreg scrap tend to be reusable instead of disposable. Despite the meager experimental discrepancies, test values and mechanical properties indicate that CFRP composite can be successfully used as a material for nonstructural applications.

scholarly journals Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

Cerâmica ◽  
2017 ◽  
Vol 63 (368) ◽  
pp. 530-535
Author(s):  
Z. L. M. Sampaio ◽  
A. E. Martinelli ◽  
T. S. Gomes
Keyword(s):  
Compressive Strength ◽  
Construction Industry ◽  
Void Ratio ◽  
Lightweight Concrete ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Tire Rubber ◽  
Increased Strength ◽  
Porcelain Tile

Abstract The recent increase in the construction industry has transformed concrete into an ideal choice to recycle a number of residues formerly discarded into the environment. Among various products, porcelain tile polishing, limestone and tire rubber residues are potential candidates to replace the fine aggregate of conventional mixtures. The aim of this study was to investigate the effect of the addition of varying contents of these residues in lightweight concrete where expanded clay replaced gravel. To that end, slump, compressive strength, density, void ratio, porosity and absorption tests were carried out. The densities of all concrete formulations studied were 10% lower to that of lightweight concrete (<1.850 kg/m³). Nevertheless, mixes containing 10 to 15% of combined residues reduced absorption, void ratio and porosity, at least 17% lower compared to conventional concrete. The strength of such formulations reached 27 MPa at 28 days with consistency of 9 to 12 cm, indicating adequate consistency and increased strength. In addition, the combination of low porosity, absorption and voids suggested improved durability.

scholarly journals Examining Polyethylene Terephthalate (PET) as Artificial Coarse Aggregates in Concrete

2020 ◽  
Vol 6 (12) ◽  
pp. 2416-2424
Author(s):  
Erniati Bachtiar ◽  
Mustaan Mustaan ◽  
Faris Jumawan ◽  
Meldawati Artayani ◽  
Tahang Tahang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Polyethylene Terephthalate ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Coarse Aggregates ◽  
Volume Weight ◽  
Concrete Mixtures ◽  
Strength Tests ◽  
Recycled Polyethylene

This study aims to examine the effect of recycled Polyethylene Terephthalate (PET) artificial aggregate as a substitute for coarse aggregate on the compressive strength and flexural strength, and the volume weight of the concrete. PET plastic waste is recycled by heating to a boiling point of approximately 300°C. There are five variations of concrete mixtures, defined the percentage of PET artificial aggregate to the total coarse aggregate, by 0, 25, 50, 75 and 100%. Tests carried out on fresh concrete mixtures are slump, bleeding, and segregation tests. Compressive and flexural strength tests proceeded based on ASTM 39/C39M-99 and ASTM C293-79 standards at the age of 28 days. The results showed that the use of PET artificial aggregate could improve the workability of the concrete mixture. The effect of PET artificial aggregate as a substitute for coarse aggregate on the compressive and flexural strength of concrete is considered very significant. The higher the percentage of PET plastic artificial aggregate, the lower the compressive and flexural strength, and the volume weight, of the concrete. Substitution of 25, 50, 75 and 100% of PET artificial aggregate gave decreases in compressive strength of 30.06, 32.39, 41.73 and 44.06% of the compressive strength of the standard concrete (18.20 MPa), respectively. The reductions in flexural strength were by respectively 19.03, 54.50, 53.95 and 61.00% of the standard concrete's flexural strength (3.59 MPa). The reductions in volume weight of concrete were by respectively 8.45, 17.71, 25.07 and 34.60% of the weight of the standard concrete volume of 2335.4 kg/m3 Doi: 10.28991/cej-2020-03091626 Full Text: PDF

Mechanical Behavior of 2D C/SiC Composites at Elevated Temperatures under Uniaxial Compression

2011 ◽  
Vol 462-463 ◽  
pp. 1-6 ◽  
Author(s):  
Tao Suo ◽  
Yu Long Li ◽  
Ming Shuang Liu
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Uniaxial Compression ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Carbon Matrix ◽  
Structural Applications ◽  
Sic Composites

As Carbon-fiber-reinforced SiC-matrix (C/SiC) composites are widely used in high-temperature structural applications, its mechanical behavior at high temperature is important for the reliability of structures. In this paper, mechanical behavior of a kind of 2D C/SiC composite was investigated at temperatures ranging from room temperature (20C) to 600C under quasi-static and dynamic uniaxial compression. The results show the composite has excellent high temperature mechanical properties at the tested temperature range. Catastrophic brittle failure is not observed for the specimens tested at different strain rates. The compressive strength of the composite deceases only 10% at 600C if compared with that at room temperature. It is proposed that the decrease of compressive strength of the 2D C/SiC composite at high temperature is influenced mainly by release of thermal residual stresses in the reinforced carbon fiber and silicon carbon matrix and oxidation of the composite in high temperature atmosphere.

Mechanical Properties of Granite-Gravel Porous Concrete

2021 ◽  
Vol 57 ◽  
pp. 115-123
Author(s):  
Samson Olalekan Odeyemi
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Optimal Combination ◽  
Control Surface ◽  
Control Specimen ◽  
Cement Ratio ◽  
Porous Concrete ◽  
Design Expert ◽  
Optimal Mix ◽  
Percentage Porosity

The need for porous concrete has become increased due its ability to control surface water, increase the rate of recharging groundwater, and reduce pollution of the ecosystem. Granite is a coarse aggregate that is quite expensive when compared with gravel in Nigeria. Therefore, this research is aimed at optimizing blended granite and gravel in the production of porous concrete. Samples of blended granite-gravel porous concrete of varying mix proportions were produced using cement to aggregate mix ratio of 1:4. The samples were tested for their porosity, workability and compressive strengths. The data collected were analyzed with the aid of Design Expert 10.0. It was observed that the optimal combination for the granite-gravel blended porous concrete is 12% granite, 88% gravel, and a water-cement ratio of 0.66%. This combination gave a porous concrete with a compressive strength of 48.4 N/mm2, percentage porosity of 6% and a compacting factor of 0.91. These values when compared to that of the control specimen revealed that the optimal mix gave a porous concrete with higher porosity, higher workability and a better compressive strength.

Sign in / Sign up

Export Citation Format

Share Document