scholarly journals Study on the Compressive Properties of Magnesium Phosphate Cement Mixing with Eco-Friendly Coir Fiber Considering Fiber Length

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3194 ◽  
Author(s):  
Zuqian Jiang ◽  
Liwen Zhang ◽  
Tao Geng ◽  
Yushan Lai ◽  
Weile Zheng ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Natural Fiber ◽  
Strain Curve ◽  
Magnesium Phosphate ◽  
Convex Curve ◽  
Coir Fiber ◽  
Compressive Properties ◽  
Compressive Test ◽  
Maximum Value

Coir fiber (CF), an eco-friendly and renewable natural fiber, was introduced into magnesium phosphate cement (MPC) mortar to improve its crack resistance. A total of 21 specimens were employed to investigate the failure pattern, compressive strength, stress–strain curve, and energy absorption of MPC with varying CF lengths (0, 5, 10, 15, 20, 25, and 30 mm) after a curing period of 28 days through a static compressive test. The results demonstrated that compressive strength, elastic modulus, and secant modulus decreased with the increase in CF length. However, energy absorption presented a convex curve, which increased to the maximum value (77.0% relative to the value of the specimen without CF) with a CF length of 20 mm and then declined. A series of modern micro-tests were then carried out to analyze the microstructure and composition of specimens to explain the properties microscopically.

Compressive Properties of Electroless Ni-P Coating Reinforced Magnesium Alloy Foams

2021 ◽  
Vol 889 ◽  
pp. 123-128
Author(s):  
Sheng Jun Liu ◽  
Zhi Qiang Dong ◽  
Ren Zhong Cao ◽  
Da Song ◽  
Jia An Liu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Absorption Efficiency ◽  
Absorption Capacity ◽  
Compressive Properties ◽  
Compressive Test ◽  
Energy Absorption Capacity ◽  
Energy Absorption Efficiency ◽  
Hybrid Foams ◽  
Electroless Ni

In this study, the open-cell Mg-2Zn-0.4Y foams were prepared by infiltration casting method. The Ni/Mg hybrid foams were prepared by electroless Ni-P coating on the foam struts to improve the compressive strength and energy absorption capacity. The compressive properties of the Mg alloy foams and Ni/Mg hybrid foams were studied by quasi-static compressive test. The experimental results show that the Ni-P coating is composed of crystallites. The Ni-P coating can significantly enhance the compressive strength, energy absorption capacity and energy absorption efficiency of the foams.

Compressive Stress of Syntactic Foam: Effect of rNBR Particles Reinforced Epoxy Macrospheres (rNBR-EM)

2018 ◽  
Vol 280 ◽  
pp. 301-307
Author(s):  
Z. Zakaria ◽  
C.Y. Yao
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Compressive Stress ◽  
Energy Absorption ◽  
Wall Thickness ◽  
Syntactic Foam ◽  
Radius Ratio ◽  
Butadiene Rubber ◽  
Syntactic Foams ◽  
Compressive Properties

This research focuses on the effect of rejected nitrile butadiene rubber (rNBR) gloves particles reinforced epoxy macrospheres (EM) on the physical properties and compressive stress of syntactic foam. Adding rNBR particles on the surface of macrospheres can increase the energy absorption as a result of improving the compressive properties of syntactic foam. Three types of macrospheres have been produced for the fabrication of syntactic foam, namely EM without rNBR, 1-layer rNBR-EM and 2-layer rNBR-EM. The results showed that increased rNBR particles layer on macrospheres has increased the wall thickness, and reduced the radius ratio of macrospheres as well as increased the density of syntactic foams. The compressive strength and modulus of syntactic foam with 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR. In addition, the toughness of the 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR.

The compressive properties and strengthening mechanism of the middle-trabecular beetle elytron plate

2018 ◽  
Vol 22 (4) ◽  
pp. 948-961 ◽  
Author(s):  
Jinxiang Chen ◽  
Xindi Yu ◽  
Mengye Xu ◽  
Yoji Okabe ◽  
Xiaoming Zhang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Sandwich Structures ◽  
Strengthening Mechanism ◽  
Absorption Capacity ◽  
Compressive Properties ◽  
Energy Absorption Capacity ◽  
Standard Energy

For the development of new types of lightweight sandwich structures, the compressive properties and strengthening mechanism of the middle-trabecular beetle elytron plate were investigated for various values of η (the ratio of the trabecular radius to the honeycomb wall length). The results are as follows: (1) When η = 0.1, the increases in the compressive strength and standard energy absorption capacity of the middle-trabecular beetle elytron plate compared with the honeycomb plate exceed those of the end-trabecular beetle elytron plate; with an increase to η = 0.15, the compressive strength remains nearly the same, the energy absorption capacity undergoes a significant further increase, and the trabeculae exhibit Φ-type failure. (2) The strengthening mechanism that gives rise to the compressive properties of the middle-trabecular beetle elytron plate is proposed as follows: the trabeculae are located at the center of the honeycomb walls, where the maximum deformations would otherwise occur; they constrain the deformation of the honeycomb walls; and the number of trabeculae in the middle-trabecular beetle elytron plate also exceeds that in the end-trabecular beetle elytron plate. (3) Middle-trabecular beetle elytron plates have the advantage of facile manufacturing, which will establish a basis for promoting the application of beetle elytron plates.

Comparative Study of Compressive Strength of Epoxy Based Bio-Composites

2018 ◽  
Vol 775 ◽  
pp. 68-73 ◽  
Author(s):  
Elammaran Jayamani ◽  
Soon Kok Heng ◽  
Perry Law Nyuk Khui ◽  
Muhammad Khusairy Bin Bakri
Keyword(s):  
Compressive Strength ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Alkaline Treatment ◽  
Fiber Composites ◽  
Vital Role ◽  
Experimental Results ◽  
Natural Fiber Composites ◽  
Compressive Test ◽  
Strength Performance

In this paper, the compressive strength of the natural fiber composites was investigated, especially on those epoxy based materials. Mulberry, cornhusk and commercialize weave jute reinforced epoxy composites were fabricated and the results were obtained through compressive test experiment. Comparison was made based on a Buransky model with the experimental results. Alkaline treatment was used to modify and alter the lumen structure of the natural fibers. It showed that the alkaline treated natural fiber composites gave promising improvement in the compressive strength compared with the raw natural fiber composites. It also showed that the misalignment angles played another vital role in in compressive strength performance. Buransky model can be used to predict the experimental results based on condition that failure occurs on the predicted misaligned angle.

scholarly journals Experimental Study on Mechanical Properties of Fly Ash Stabilized with Cement

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Shengquan Zhou ◽  
Yongfei Zhang ◽  
Dawei Zhou ◽  
Weijian Wang ◽  
Dongwei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Early Stage ◽  
Strain Curve ◽  
Pozzolanic Reaction ◽  
Hydration Reaction ◽  
Hydration Products ◽  
Compressive Test ◽  
Plastic Properties

Cement-fly ash mixture has been commonly used for the foundation treatment projects in the fly ash stratum, as it is effective in improving foundation bearing capacity and reducing settlement of stratum. In order to figure out the effect of dynamic and static load on the mechanical properties exhibited by the cement-fly ash and the reaction mechanism of cement-fly ash, a combination of the unconfined compressive test, impact test, scanning electron microscopy (SEM), and X-ray diffraction (XRD) method was adopted in this study to investigate the cement-fly ash test samples. As demonstrated by the results, the observed growth rate of 0–60 days (d) is higher than that in the later stages and the typical stress-strain curve can be divided into six sections under the unconfined compressive test. At the gas pressure of 0.2 MPa, the cement-fly ash samples exhibited obvious plastic properties in early curing time (0–60 d), and brittle failure was observed in the final stage (90 d). It is obvious that the value of dynamic compressive strength (DCS) is higher than that of unconfined compressive strength (UCS). The analysis of XRD has revealed that the hydration products are primarily derived from the hydration reaction of cement in the early stage and the pozzolanic reaction in the late stage. The pores of cement-fly ash are found to be filled with the hydration products, despite the presence of a mass of pores in the interior.

Effect of Powder Surface Oxide on Compressive Properties of Aluminium Foams

2010 ◽  
Vol 93-94 ◽  
pp. 219-222 ◽  
Author(s):  
Seksak Asavavisithchai
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Cell Walls ◽  
Surface Oxide ◽  
Oxide Content ◽  
Compressive Properties ◽  
Foam Structure ◽  
Powder Surface

The compressive properties of aluminium foams have been shown to be affected by the oxide content in aluminium powders. An increase in the oxide content results in increasing compressive strength and energy absorption of the foams. Oxides were found to form a network of crumpled films which retards the drainage of aluminium melt during foaming. The presence of larger oxide network in foam structure due to higher oxide content in aluminium powders can effectively strengthen the Plateau borders and cell walls of the foams.

scholarly journals Effects of Polypropylene Fibre and Strain Rate on Dynamic Compressive Behaviour of Concrete

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1797 ◽  
Author(s):  
Meng Chen ◽  
Chenhui Ren ◽  
Yangbo Liu ◽  
Yubo Yang ◽  
Erlei Wang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Energy Absorption ◽  
Split Hopkinson Pressure Bar ◽  
Absorption Capacity ◽  
Fibre Content ◽  
Hopkinson Pressure Bar ◽  
Compressive Properties ◽  
Failure Patterns ◽  
Compressive Behaviour

This paper presents an experimental study on the dynamic compressive behaviour of polypropylene (PP) fibre reinforced concrete under various strain rates using split Hopkinson pressure bar (SHPB) equipment. The effects of PP fibre content and strain rate on the dynamic compressive stress-strain relationship and failure patterns were estimated. The results indicated that the addition of PP fibre enhanced the dynamic compressive properties of concrete mixtures although it resulted in a significant reduction in workability and a slight decrease in static compressive strength. Considering the workability, static compressive strength and dynamic compressive behaviour, the optimal PP fibre content was found to be 0.9 kg/m3 as the mixture exhibited the highest increase in dynamic compressive strength of 5.6%, 40.3% in fracture energy absorption and 11.1% in total energy absorption; further, it showed the least reduction (only 5.8%) in static compressive strength among all mixtures compared to the reference mixture without fibre. For all mixtures, the dynamic compressive properties, energy absorption capacity, strain at peak stress, ultimate strain and dynamic increase factor (DIF) were significantly influenced by strain rate, i.e., strain rate effect. When the strain rate was relatively low, PP fibres were effective in controlling the cracking, and the dynamic compressive properties of PP fibre reinforced mixtures were improved accordingly.

scholarly journals Unconfined Compressive Properties of Composite Sand Stabilized with Organic Polymers and Natural Fibers

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1576 ◽  
Author(s):  
Yuxia Bai ◽  
Jin Liu ◽  
Zezhuo Song ◽  
Zhihao Chen ◽  
Canhui Jiang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Axial Stress ◽  
Natural Fibers ◽  
Minimum Cost ◽  
Soil Reinforcement ◽  
Sisal Fiber ◽  
Fiber Types ◽  
Coir Fiber ◽  
Compressive Properties ◽  
Failure Patterns

As renewable and environment-friendly materials, coir and sisal natural fibers can be used in soil reinforcement with minimum cost and other benefits. In this study, we focused on their improvements of unconfined compressive properties of polymer treated sand. In total, 36 groups of unconfined compressive strength tests, combined with X-ray diffraction and scanning electron microscope investigations were performed. We had studied the effects of polymer and fiber contents, and fiber types on the reinforcement effectiveness. The results showed that both coir and sisal fiber can improve the mechanical properties and microstructure of treated sand. In terms of strength properties, sisal fiber inclusion was better than coir fiber, while both have a similar reinforcement benefit on soil ductile behaviors. The strength and compressive energy increased with an increment in polymer and fiber content. The reinforced sand can have up to 1 MPa compressive strength and 140 kPa compressive energy for coir fiber inclusion, while 1.2 MPa and 170 kPa, respectively, for sisal fiber. The axial stress-strain characteristics and failure patterns were also improved, and the brittle index decreased toward zero, which suggests an increasing ductile. The polymer membrane enwrapping and bonding sand grains, and the network structure built by fiber crossing and overlapping among sand grains, as well as the interfacial attachment conferred by polymer between sand grains and fiber, all contributed to the reinforcement of treated sand.

scholarly journals Investigation of Mechanical Properties of Concrete Containing Liquid Silicone Rubber Under Axial Loads

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Alireza Khaloo ◽  
Yaser Parvin darabad
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Energy Absorption ◽  
Silicone Rubber ◽  
Compressive Strain ◽  
Strain Curve ◽  
Plain Concrete ◽  
Unit Weight ◽  
Liquid Silicone Rubber ◽  
Liquid Silicone

As the experts who have taken for granted the merits of utilizing the concrete as the most common material in the structural industry, there is a need to take affirmative steps to enhance the concrete’s weaknesses such as the low ductility and energy absorption capacity. One possible way to improve the mechanical properties of concrete is to add liquid silicone rubber to the concrete. Silicone rubber is an elastomer (rubber-like material) composed of liquid rubber polymer and its hardener which is widely used in voltage line insulators, automotive applications, and medical devices. In order to increase the ductility and energy absorption of concrete, the liquid silicone rubber replaced a portion of mineral aggregates in concrete. HSRC (hybrid silicone rubber concrete) is a mixture of liquid silicone rubber with fresh concrete that liquid silicone rubber after 24 hours becomes a flexible solid rubber with low strength. In this paper, liquid silicone rubber was used to replace 0%, 2%, 4%, 8%, 12.5%, 25%, and 50% of the total mineral aggregate’s volume in concrete. Standard specimens were fabricated and tested. The fresh HSRC exhibited acceptable workability and lower unit weight compared to ordinary plain concrete. The uniaxial compressive strain-control test was conducted on the hardened HSRC specimens to obtain the complete stress-strain curve. The results showed that, with the increase of liquid silicone rubber in concrete, the amount of compressive strength, splitting tensile stress, and elastic modulus decreased. It was also observed that the percentage of reduction in compressive strength was greater than the percentage of reduction in tensile strength. Increasing silicone rubber concentration in HSRC changes the brittle mode of failure to ductile that demonstrated using nonlinearity indices. Unlike plain concrete, the failure state in HSRC occurs gently and uniformly and does not cause so much separation in the specimens. Larger deformation and higher toughness indices were obtained, when the silicone rubber concentration was increased.

scholarly journals A study into flexural, compressive and tensile strength of coir-concrete as sustainable building material

2019 ◽  
Vol 258 ◽  
pp. 01011
Author(s):  
Rilya Rumbayan ◽  
Sudarno ◽  
Adriana Ticoalu
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Natural Fiber ◽  
Construction Material ◽  
Fiber Content ◽  
Sustainable Construction ◽  
Unit Weight ◽  
Coir Fiber ◽  
Coconut Tree

Coir has been known as a potential natural fiber for many sustainable construction material developments due to its wide availability and sustainable resource of coconut tree. This research study aims to investigate the flexural, compressive and tensile properties of concrete incorporating coir fiber and to find the fiber content which gives optimum results. In this study, coir concrete specimens were cast and tested with variations of fiber content of 0%, 0.25%, 0.5%, 0.75%, and 1% by weight of aggregates. Flexural test was conducted based on SNI 4431:2011, compressive test was conducted based on SNI 1974:2011 and tensile test was conducted based on SNI 2491:2014. Slump tests and unit weight showed reduced values when fiber content was increased. Flexural, compressive and tensile strengths of coir-concrete at a 28-day curing were optimum for the variation with 0.25% fiber content. Compressive strength of control concrete at 28 days was approximately 23 MPa while BS-0.25 was 27.5 MPa. Flexural strength of control concrete was 5 MPa while BS-0.25 was 6 MPa. Tensile strength of control concrete was 3 MPa while BS-0.25 was 2.5 MPa. Results from the study showed that the presence of 0.25% fiber (by total weight of aggregate) in the concrete gives approximately 19% improvement in 28 days compressive strength and flexural strength.

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