scholarly journals Experimental Study on the Preparation of Recycled Admixtures by Using Construction and Demolition Waste

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1678 ◽  
Author(s):  
Shujun Li ◽  
Qiuyi Li ◽  
Xiaolong Zhao ◽  
Jianlin Luo ◽  
Song Gao ◽  
...  
Keyword(s):  
Particle Size ◽  
Negative Impact ◽  
Activity Index ◽  
Particle Morphology ◽  
Particle Size Analysis ◽  
Construction And Demolition Waste ◽  
Size Analysis ◽  
Demolition Waste ◽  
Different Types ◽  
Advanced Analysis

The use of construction and demolition waste (CDW) to prepare recycled admixtures is of great significance for the complete resource reutilization of CDW. In this paper, different kinds of CDW were prepared into recycled powder (RP) with a specific particle size (0–45 µm or 0–75 µm). The fineness, water requirement ratio (WRR), fluidity, loss on ignition (LOI), strength activity index (SAI) and compatibility of cement and superplasticizer (CCS) were examined. The above test results were analyzed by advanced analysis tools, such as laser particle size analysis, XRD, XRF, DSC-TGA, SEM, and BET. The properties of different types of RPs varied greatly, which was closely related to the microstructure, particle morphology and chemical composition of the RP. The experimental results showed that all kinds of RPs after grinding had a high fineness and good particle size distribution, and the mineral composition was dominated by SiO2 with the content exceeding 50%. The WRR of various RPs was between 105% and 112%, and the SAI was between 68% and 78%, but the LOI varied greatly. Different types of RPs had a negative impact on the CCS, but the compatibility of cement and naphthalene-based superplasticizer was less affected. The content of recycled brick powder (RBP) in a hybrid recycled powder (HRP) was an important factor. When the content of RBP in HRP exceeded 50%, the HRP could meet the basic performance requirements of fly ash.

scholarly journals Preparation and Characterization of Betel Leaves (Piper betle Linn) Extract Nanoparticle with Ionic Gelation Method

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Dwi Saryanti ◽  
Dian Nugraheni ◽  
Nisa Sindi Astuti
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Leaf Extract ◽  
Particle Morphology ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Piper Betle ◽  
Ionic Gelation ◽  
Betel Leaf

Nanoparticles are used in drug delivery which can increase mass transfer so increase the absorption and effectiveness of the drug. Therefore, its prospect to improve antibacterial and antioxidants activities of betel leaves. The research aimed to preparation and characterization of betel leaf extract using ionic gelation technique. The formulation of nanoparticles from betel leaf extract with ionic gelation method using alginate and CaCl2 with a ratio of 2.5: 1. The characterization of the nanoparticles includes particle size analysis, zeta potential, particle morphology and determination of flavonoid content. Particle size analysis demonstrated that the betel leaf extract nanoparticles had a particle size of 243,03 ± 1,48 nm, zeta potential of -23,0 ± 0,35 mV and morphology of particle showed that a flat shape. The betle leaf exctract nanoparticle positively contained flavonoid with Rf 0.7 equivalent to quercetin. The betel leaf extract can be made nanoparticles with ionic gelation method using alginate and CaCl2.

Influence of Fineness on Activity Index of Blast Furnace Slag with Different SiO2/Al2O3

2015 ◽  
Vol 814 ◽  
pp. 579-582
Author(s):  
Su Ping Cui ◽  
Ling Ling Liu ◽  
Ya Li Wang ◽  
Hui Wang ◽  
Shi Jie Dong
Keyword(s):  
Particle Size ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Activity Index ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Average Particle ◽  
Furnace Slag ◽  
Activity Indices

Granulated blast furnace slag (GBFS) is a by-product of ironmaking and widely used in the cement and concrete. GBFS samples with different ratio of SiO2/Al2O3 were prepared under the laboratory conditions and ground by the agate ball mill at different times. Then they were characterized by laser particle size analysis (LPSA), scanning electron microscopy (SEM), Bertrand surface method and mechanical testing. It was found that the activity index of GBFS clearly increased with the decrease of the GBFS particle size. In the case of the average particle size about 32μm, the activity indices were irregular with the increase of SiO2/Al2O3 ratio, whereas for the average particle size about 11μm, the activity indices decreased with the increase of SiO2/Al2O3 ratio.

Ball Milling of WC-Co Powder as Injection Molding Feedstock

2011 ◽  
Vol 110-116 ◽  
pp. 1425-1430
Author(s):  
Sri Yulis M. Amin ◽  
Norhamidi Muhamad ◽  
Khairur Rijal Jamaludin ◽  
Abdolali Fayyaza ◽  
Heng Shye Yunn
Keyword(s):  
Particle Size ◽  
Ball Milling ◽  
Particle Morphology ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Elemental Distribution ◽  
Wet Milling ◽  
Particle Size Reduction ◽  
Milling Medium ◽  
Wet Condition

In this paper, an attempt has been made to mill constituent of WC and Co powder towards achieving volumetric percentage of WC (91%) and Co (9%). The ball milling technique was conducted under dry and wet condition using various milling parameters, rotation speed, time and ethanol as milling medium. Electron dispersive spectrometer (EDS) detected the elemental distribution, whilst SEM and particle size analysis was done to study the effect of changes in particle morphology and reduction of particle size. As a conclusion, powder milled by parameter of wet milling by ethanol, speed of rotation at 250 rpm and 90 minutes of milling time exhibits best results in term of volumetric percentage of 91%WC and 9%Co and particle size reduction.

APSAS; an Automated Particle Size Analysis System

Circular ◽  
1985 ◽  
Author(s):  
Lawrence J. Poppe ◽  
A.H. Eliason ◽  
J.J. Fredericks
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Analysis System
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