A Review Paper on: Effect of Different Types of Filler Materials on Marshall Characteristics of Bitumen Hot Mix
Gazi Mohammad Harun-Or-Rashid,
Mohammad Mohayminul Islam
Issue:
Volume 9, Issue 3, May 2020
Pages:
40-46
Received:
11 August 2020
Accepted:
14 September 2020
Published:
24 September 2020
Abstract: Bituminous hot mix is one of the most widely used and costly flexible pavement layer. It involves a huge outlay of investment. Precise engineering and usage of proper materials can make it more cost efficient, durable, convenient for users and most importantly ecofriendly. To reduce the cost of construction engineers all over the globe are investigating for the alternative material to obtain same amount of output (strength, stability and durability) by paying a little. There are four constituents of a hot mix, coarse aggregate, fine aggregate, binder and filler. Filler in the bitumen hot mix fill the void in between the aggregates which is very important for strength and stability of the pavement. But the fillers are conventionally used (cement and lime) are very costly which affect the total cost of construction. That’s why the researchers emphasized on the waste material to serve this purpose as well as to keep the environment clean. A large range of waste material like fly ash, bagasse ash, marble dust, stone dust, brick dust, kiln dust, waste concrete dust, foundry sand, bio gypsum, ceramic dust etc. has been use as a filler for numerous research works by the researchers globally. The materials yielded very satisfactory results. Fly ash, bagasse results in nearly same Marshall properties (stability, OBC, %VFA, %VMA, %Va) like the conventional one. Although the brick dust and stone dust provide a high amount of air voids but they also result high stability. More or less all these non-conventional materials are capable to fully or partially replace the conventional filler. This study focused on the effect on the Marshall hot mix design properties after using these fillers mentioned above.
Abstract: Bituminous hot mix is one of the most widely used and costly flexible pavement layer. It involves a huge outlay of investment. Precise engineering and usage of proper materials can make it more cost efficient, durable, convenient for users and most importantly ecofriendly. To reduce the cost of construction engineers all over the globe are investig...
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Review on Biosynthesis, Characterization and Antibacterial Activity of Silver Nanoparticles
Issue:
Volume 9, Issue 3, May 2020
Pages:
47-52
Received:
23 June 2020
Accepted:
8 August 2020
Published:
12 October 2020
Abstract: Recently, nanotechnology has attracted great attention due to its wide applications for different fields of science. Nanoparticles are a cluster of atoms in the range of 1-100 nm that provides mechanical, optical, electrical, and structural advanced, and also an increased surface area than the original substance. Nanostructure materials have got an enhancement to the feature of life and preservation of the environment. Now a day’s silver nanoparticles have gained attention due to its uses in various areas of human interest in the industry, medicine, human health, and agriculture. It is the most popular metallic nanoparticles in antimicrobial, antioxidant, and anti-cancer properties as different researchers reported. The objective of this review is to brief recent progress in the biosynthesis of AgNPs. This review may have a great contribution in the field of green synthesis, characterization, and antibacterial activities of AgNPs. There are three types of nanoparticles synthesis approaches they are physical, chemical, and biological methods. The biological method for the synthesis of AgNPs is a preferable approach due to its simplicity, cost-effectiveness, easily scale up to the industry and non-toxicity. Plants and their parts contain carbohydrates, fats, proteins, nucleic acids, pigments, and several types of secondary metabolites which act as reducing agents to produce nanoparticles from metal salts without producing any toxic by-product. In this review, different researches reported different particle size of AgNPs (0.011 – 90 nm) and shape by using different plant material. I conclude This review is concerned with the green synthesis of AgNPs, characterization, and antibacterial activity of AgNPs.
Abstract: Recently, nanotechnology has attracted great attention due to its wide applications for different fields of science. Nanoparticles are a cluster of atoms in the range of 1-100 nm that provides mechanical, optical, electrical, and structural advanced, and also an increased surface area than the original substance. Nanostructure materials have got an...
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