scholarly journals Mechanical properties of concrete with substitution of coated styrofoam balls on coarse aggregate

2019 ◽  
Vol 276 ◽  
pp. 01028
Author(s):  
Bernardinus Herbudiman ◽  
Erma Desmaliana ◽  
Andhi Muhammad Irawan
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Lightweight Concrete ◽  
Density Ratio ◽  
Experimental Results ◽  
Ratio Method ◽  
Coating Materials ◽  
Air Content ◽  
Coarse Aggregates ◽  
Pozzolanic Material

Substitution of Styrofoam balls on coarse aggregates reduced concrete self-weight. Coating on Styrofoam ball surface makes ball has shell on its surface and could increase the adhesive strength between ball surfaces and cement paste. The coating materials made by mixing of Portland cement and RCC-15 (Residual Catalytic Cracker-15) as pozzolanic material. 20 mm diameter Styrofoam balls are used. Coarse aggregates substituted by 5%, 15%, and 20% Styrofoam balls. The test specimens used three 10x20cm cylinders for each variant. Beam specimens of 15x15x60cm used for bending strength test by third point loading method. The testing of mechanical properties were 7, 14, and 28 days compressive strengths, 28 days split-tensile strengths and 28 days flexural strengths. The experimental results of concrete with various Styrofoam ball substitutions of 5%, 15%, and 20% at 28 days show the average compressive strengths are 27.6 MPa, 24.3 MPa, and 20.3 MPa, the splittensile strengths are 2.5 MPa, 2.2 MPa, and 1.7 MPa, and the flexural strengths are 5 MPa, 4.5 MPa, and 3.8 MPa, respectively. The compression strength could be predicted by density ratio method and air content method. The experimental results show that all of the variants of Styrofoam ball coarse aggregates concrete are adequate to achieve structural strength, and have nearly compressive strengths compared with the prediction by density ratio method and air content method. Styrofoam balls substitution content could be increased to make the concrete density below 1,900 kg/m3 and compressive strength above 17.5 MPa to reach structural lightweight concrete performance.

scholarly journals Mechanical properties of porous concrete with variations of coarse aggregate gradation

2019 ◽  
Vol 276 ◽  
pp. 01027
Author(s):  
Hazairin ◽  
Erma Desmaliana ◽  
Bernardinus Herbudiman ◽  
Wira Yudha Saputra
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Bending Strength ◽  
Coarse Aggregate ◽  
Experimental Results ◽  
Fine Aggregate ◽  
High Porosity ◽  
Aggregate Gradation ◽  
Porous Concrete ◽  
Air Content

Porous concrete is an innovation in sustainable concrete technology, which has high porosity concrete without fine aggregate. Porous concrete used in rain gardens, planter boxes, permeable pavements at urban open spaces could absorb rainwater so it can reduce run-off. This experimental study purposes to determine the compressive, split-tensile, flexural strengths, and permeability of porous concrete with various gradation of coarse aggregates. This study used a concrete mixture with coarse aggregate gradation variations of gap, continuous, and uniform on the water cement ratio of 0.4. The test specimens used three cylinders of 15x30cm for compressive and split-tensile strengths, except for uniform gradations used three cylinders of 10x20cm. Beam specimens of 15x15x60cm used for bending strength test by third point loading method. The tested mechanical properties are 7, 14, and 28 days-compressive strengths, 28 days split-tensile strength, and 28 days bending strength. The experimental results also show the average compressive strengths of porous concrete with variation of gradations of gap, continuous, and uniform for 28 days is 14.6 MPa, 13.0 MPa, and 10.6 MPa, respectively. Volumetric flow rate of porous concrete with gap, continuous, and uniform aggregate gradations is 28.4 ml/s, 32.1 ml/s, and 39.3 ml/s, respectively. The experimental results show that gap gradation is recommended due to its better compressive and flexural strengths. In porous concrete, aggregate gradations influence the air content. The highest air content results the lowest compressive strength of concrete. The designed air content should be controlled to maintain the expexted compressive strength of porous concrete.

Preparation and Properties of SiC/Phenolic Resin for the Heat of LED

2016 ◽  
Vol 848 ◽  
pp. 454-459
Author(s):  
Cong Wu ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Ji Yuan Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Experimental Results ◽  
Low Thermal Conductivity ◽  
Industry Standard ◽  
Insulation Performance

In order to solve the problem that low thermal conductivity of the plastics for the heat of LED, SiC/Phenolic resin for the heat of LED were fabricated combining powder metallurgy. The effects of particles diameters, content and adding nanoparticles on thermal conductivity of the fabricated composites were investigated, the mechanical properties were also characterized. The experimental results showed that the materials were obtained, and the insulation performance of the fabricated SiC/Phenolic resin was higher than the industry standard one, the thermal conductivity reached 4.1W/(m·k)-1. And the bending strength of the fabricated composites was up to 68.11MPa. The problem of low thermal conductivity of the material is expected to be solved. In addition, it is meaningful for improving LED life.

scholarly journals Mechanical Properties of Lightweight Concrete Using Recycled Cement-Sand Brick as Coarse Aggregates Replacement

2018 ◽  
Vol 34 ◽  
pp. 01029
Author(s):  
Ilya Joohari ◽  
Nor Farhani Ishak ◽  
Norliyati Mohd Amin
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Mechanical Testing ◽  
Lightweight Concrete ◽  
Control Sample ◽  
Density Measurement ◽  
Flexural Test ◽  
Coarse Aggregates ◽  
Optimum Proportion ◽  
Natural Aggregates

This paper presents the result of replacing natural course aggregate with recycled cement-sand brick (CSB) towards the mechanical properties of concrete. Natural aggregates were used in this study as a control sample to compare with recycled coarse aggregates. This study was also carried to determine the optimum proportion of coarse aggregates replacement to produce lightweight concrete. Besides, this study was conducted to observe the crack and its behaviour development during the mechanical testing. Through this study, four types of concrete mixed were prepared, which were the control sample, 25%, 50% and 75% replacement of CSB. The test conducted to determine the effectiveness of recycled CSB as coarse aggregates replacement in this study were slump test, density measurement, compression test, and flexural test and. The strength of concrete was tested at 7 days and 28 days of curing. From the results obtained, the optimum proportion which produced the highest strength is 25% replacement of recycled CSB. The compressive and flexural strength has decreased by 10%-12% and 4%-34% respectively compared to the control sample. The presence of recycled coarse aggregates in sample has decreased the density of concrete by 0.8%-3% compared to the control sample.

scholarly journals Development of Porous Titanium Sheet with High Porosity and Good Mechanical Properties

2020 ◽  
Vol 321 ◽  
pp. 13004
Author(s):  
Yasuhiko Goto ◽  
Yosuke Inoue ◽  
Hideki Fujii ◽  
Matsuhide Horikawa
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Density Ratio ◽  
Porous Titanium ◽  
High Porosity ◽  
Sintering Process ◽  
Titanium Sheet ◽  
Porous Ti ◽  
Process Effects ◽  
Sintering Condition

To respond to the requirements for porous Ti sheet with the balanced properties of high porosity and good mechanical properties, and to optimize the manufacturing conditions of the simple powder-filling plus sintering process, effects of sintering temperatures on density and bending strength in porous Ti sheet were investigated. The optimum sintering condition was 900-950 °C for 1h to obtain porous Ti sheet with the balanced density ratio (around 40%) and high bending strength. The polyhedron shape of HDH powders contributed to those balanced properties, in which localized sintering raised bending strength with keeping high porosity (low density). Using the optimum manufacturing conditions, large sized porous Ti sheet of 400 × 800 × 0.5 mm was successfully manufactured.

Effect of Various Additives and Aeration on the Properties of Lightweight Concrete

2018 ◽  
Vol 762 ◽  
pp. 351-355 ◽  
Author(s):  
Genadijs Sahmenko ◽  
Eva Namsone ◽  
Kristaps Rubenis ◽  
Arita Dubnika ◽  
Guntars Niparts
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Silica Fume ◽  
Bending Strength ◽  
Lightweight Concrete ◽  
Silica Sand

In the present study the effect of various additives (silica sand, silica fume, zeolite and cenospheres) as well as the aeration on the properties (consistency, density, compressive and bending strength) of lightweight concrete was studied. Density, compressive and bending strength of the lightweight concrete were substantially reduced by replacing silica sand with censopheres or by adding air entraining agent to the grout used for the preparation of the samples. Silica fume and zeolite admixture improved mechanical properties of the samples. Specific compressive strength of the cenospheres containing samples is comparable or even higher than the ones made of the mixes without the cenospheres.

The Microstructures and Mechanical Properties of Molybdenum Disilicide Preforms Infiltrated by Aluminum

2006 ◽  
Vol 317-318 ◽  
pp. 331-334 ◽  
Author(s):  
Xiao Li Zhang ◽  
Zhi Hao Jin ◽  
Zhen Lin Lu
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Bending Strength ◽  
Molybdenum Disilicide ◽  
Experimental Results ◽  
Reactive Infiltration ◽  
Infiltration Temperature ◽  
N2 Atmosphere ◽  
Different Temperatures ◽  
High Infiltration

Infiltrant aluminum was infiltrated into molybdenum disilicide preforms in N2 atmosphere at different temperatures by liquid reactive infiltration processing. The mechanical properties and phase composition of these materials were analyzed and discussed. The experimental results showed that the samples were corresponding to 10 at.% Al averagely after sintered, and consisted of Mo(Al,Si)2 phase and Al-Si alloy phase. High infiltration temperature would lead to Al deficiency mainly in Al-Si alloy phase. The highest bending strength of 737 MPa was reached at infiltration temperature of 1350 °C because the sample had fine and integrated grains, and the strong combination between particles. When the infiltration temperature was higher than 1350 °C, the bending strength of material prepared would decrease because of the phase fragmentation.

The Study of Mechanical Properties of Structural Lightweight Concrete

2010 ◽  
Vol 97-101 ◽  
pp. 1620-1623 ◽  
Author(s):  
Hong Zhi Cui ◽  
Feng Xing
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Bond Strength ◽  
Modulus Of Elasticity ◽  
Lightweight Concrete ◽  
Experimental Studies ◽  
Lightweight Aggregate ◽  
Experimental Results ◽  
The Relationship

Many investigations have been conducted on compressive strength of lightweight aggregate concretes (LWAC), but there are few experimental studies on the relationship between compressive strength, bond strength and elastic modulus of LWAC. In this paper, the specimens of twenty kinds of LWACs with different mix proportions were made. Properties of compressive strength, bond strength and modulus of elasticity of the LWACs were tested. Based on the testing resulting, equations for relationship between bond strength and compressive strength of the LWAC were established. For LWAC modulus of elasticity, the experimental results of this study can fit well with predicted equation of ACI 318

Study on bending and tensile properties of a T-shaped hook-connected structure made of two-and-a-half-dimensional woven composites and laminated composites

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4046-4059 ◽  
Author(s):  
Hongjian Zhang ◽  
Junhua Guo ◽  
Weidong Wen ◽  
Haitao Cui ◽  
Shu He
Keyword(s):  
Mechanical Properties ◽  
Failure Modes ◽  
Bending Strength ◽  
Laminated Composites ◽  
Prediction Method ◽  
Experimental Results ◽  
Bending Test ◽  
Woven Composites ◽  
Root Edge ◽  
Connected Structure

In this paper, a kind of T-shaped hook-connected structure, which consists of a T-shaped plate made of two-and-a-half-dimensional woven composites and a groove structure made of T300/BMP316 laminated composites, was designed as the simulator specimen of the connection structure between the vane and the case in an aero-engine. As the bending strength and tensile strength are important mechanical properties, bending tests and tensile tests, respectively, of the T-shaped hook-connected structure were conducted to study the mechanical properties and failure modes under bending and tensile loads on web. Experimental results showed that the initial damages both occur at the root-edge, and then the damages extend to the root-middle during the bending test or extend perpendicular to the root-edge to the margin of the flange during the tensile test. Then, a strength prediction method based on the progressive damage theory was developed to simulate the mechanical properties and damage processes of the T-shaped hook-connected structure under bending and tensile loads, respectively. Compared with experimental results, the maximum error is less than 10%, and the damage modes are similar.

Preparation and Mechanical Properties of Diamond Honing Oilstone

2017 ◽  
Vol 893 ◽  
pp. 354-359 ◽  
Author(s):  
Jun Nan Tao ◽  
Xiang Zhao Zhang ◽  
Gui Wu Liu ◽  
Zi Wei Xu ◽  
Hai Cheng Shao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Bending Strength ◽  
Volume Fraction ◽  
Sintering Temperature ◽  
Interfacial Bonding ◽  
Experimental Results ◽  
Rockwell Hardness ◽  
Abrasive Material ◽  
Binder Metal

The diamond honing oilstone was fabricated by hot-pressing at 550–650 °C and 25 MPa pressure for 4 min, using Cu–Sn based alloys as binder metal and uncoated or W-coated diamond grains as abrasive material. The microstructures and phase compositions of the honing oilstone were examined and analyzed by SEM and XRD. Effects of the oilstone composition, sintering temperature and volume fraction of diamond grains on the mechanical properties of diamond honing oilstone were investigated. The experimental results show that the interfaces between the diamond grains and metal matrices of all the oilstone samples are smooth and no defects are observed in the metal matrices. The bending strength and rockwell hardness of the honing stones increase with the sintering temperature increasing from 550 °C to 650 °C, and the bending strength decrease with the increase of diamond grains faction. The minimum grinding ratio is obtained as the diamond was W-coated, which can be attributed to the improved interfacial bonding derived from the W coating.

A Comparative Study on Plastic Concrete and Partially Replaced Plastic Concrete using Plastic Aggregate with Conventional Concrete

2021 ◽  
Vol 9 (VI) ◽  
pp. 390-397
Author(s):  
Vasundhara Singh
Keyword(s):  
Mechanical Properties ◽  
Lightweight Concrete ◽  
Solid Waste Management ◽  
Thermal Characteristics ◽  
Important Change ◽  
Environmental Concerns ◽  
Conventional Concrete ◽  
Coarse Aggregates ◽  
Plastic Concrete ◽  
Recycled Plastics

Solid waste management is one of the major environmental concerns in our country now a day. The present study covers the use or recycled plastics as replacement of coarse aggregates in concrete. The main aim of the study is to investigate the change in mechanical properties of concrete with the addition of plastics in concrete. Along with the mechanical properties, thermal characteristics of the resultant concrete are also studied. It is found that the use of plastic aggregates results in the formation of lightweight concrete. The compressive, as well as tensile strength of concrete reduces with the introduction of plastics. The most important change brought about by the use of plastics is that the thermal conductivity of concrete is reduced by using plastics in concrete. Therefore, it can be said that recycled plastics can be used for thermal insulation of buildings.

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