It's just ducky to be clean: the water repellency and water penetration resistance of swimming mallard Anas platyrhynchos ducklings

2006 ◽  
Vol 37 (6) ◽  
pp. 561-571 ◽  
Author(s):  
George S. Bakken ◽  
Marilyn R. Banta ◽  
Clay M. Higginbotham ◽  
Aaron J. Lynott
Keyword(s):  
Anas Platyrhynchos ◽  
Water Repellency ◽  
Penetration Resistance ◽  
Water Penetration

Influence of Recycled Aggregate Defects on the Durability of Recycled Aggregate Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 173-182 ◽  
Author(s):  
Gai Fei Peng ◽  
Juan Yang ◽  
Jing Yan Wang
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Chloride Ion ◽  
Penetration Resistance ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Water Penetration ◽  
Aggregate Concrete ◽  
Chloride Ion Penetration

An experimental investigation was conducted on the durability of recycled aggregate concretes with the water to binder ratios of 0.26 and 0.60, including chloride ion penetration resistance test, freezing-thawing resistance test and water penetration resistance. Natural aggregate, recycled aggregate untreated and recycled aggregate treated by sulfuric acid solution, were employed. Results indicated that, 3 mol/L acid concentration and the 7 days soaking duration was the optimum to remove the attached mortars in recycled aggregate, and its removal rate could reach to 90.8%. Water penetration resistance, chloride ion penetration resistance and freezing-thawing resistance of concrete with 0.26 W/B was superior to that of concrete with 0.60 W/B. The more pores in the internal of concrete with 0.60 W/B could be attributed to that. Durability of recycled aggregate concrete, incorporating recycled aggregate treated by sulfuric acid solution, was improved. In particular, the improvement in recycled high strength concrete was significant.

scholarly journals Wettability and Phylogenetic Development of Feather Structure in Water Birds

1970 ◽  
Vol 52 (2) ◽  
pp. 469-479 ◽  
Author(s):  
A. M. RIJKE
Keyword(s):  
Structural Parameters ◽  
Water Repellency ◽  
Structural Parameter ◽  
Time Interval ◽  
Geological Time ◽  
Water Penetration ◽  
Quality Of Water ◽  
Behavioural Patterns ◽  
Water Birds

1. The water repellency of feathers is determined mainly, but not exclusively, by a structural parameter which can be expressed in terms of diameter and spacing of the barbs and barbules. 2. Effective waterproofing properties result from the optimal balance of structural parameter and resistance to water penetration. 3. Comparison of the structural parameters for water birds with the geological time interval of their earliest fossil record shows a phylogenetic tendency toward optimizing waterprooftng properties with the course of time. 4. Several behavioural patterns are discussed which may have evolved under the selective pressure of the quality of water repellency and resistance to water penetration.

Effect of aging on the penetration resistance of sands

1995 ◽  
Vol 32 (5) ◽  
pp. 767-782 ◽  
Author(s):  
R.C. Joshi ◽  
Gopal Achari ◽  
Shenbaga R. Kaniraj ◽  
H. Wijeweera
Keyword(s):  
Sea Water ◽  
Penetration Resistance ◽  
Distilled Water ◽  
Freezing And Thawing ◽  
Water Penetration ◽  
River Sand ◽  
Sea Sand ◽  
Rate Of Increase ◽  
Sand Particles ◽  
Masonry Sand

The main objective of this study was to understand the effect of aging on the penetration resistance of freshly deposited sands. Two types of sand, locally available river sand used as masonry sand and Beaufort Sea sand, were selected for the study. The sands were allowed to age under a constant stress of 100 kPa in a specially designed apparatus in a dry state, as well as submerged in distilled water and in simulated sea water. Penetration resistance of the sand beds was measured periodically by pushing 4 probes into the sand bed. Mineralogical and fabric studies on freshly deposited and aged sand samples were conducted to detect the effect of aging, if any, on sand grains. The results indicate that aging significantly increases the penetration resistance of sands. The rate of increase in penetration resistance was higher for the submerged sand as compared with the dry sand. The increase in penetration resistance of the sand in a dry state was attributed to rearrangement of sand grains. In the submerged state, besides the rearrangement of sand particles, partial cementation caused by precipitation of salts and probably also silica on the sand grains and in the pores resulted in the larger increase in the penetration resistance. Key words : sand, aging, penetration resistance, freezing and thawing, sea water, distilled water.

Water Penetration Resistance of Green Concrete Incorporating with Quarry Wastes

2014 ◽  
Vol 875-877 ◽  
pp. 619-623 ◽  
Author(s):  
Suppachai Sinthaworn ◽  
Wasan Teerajetgul ◽  
Attasit Sirivachiraporn
Keyword(s):  
Compressive Strength ◽  
Penetration Depth ◽  
Penetration Resistance ◽  
Fine Aggregate ◽  
Water Penetration ◽  
River Sand ◽  
Green Concrete ◽  
Mix Proportion ◽  
Water To Cement Ratio ◽  
Quarry Dust

In this study, the workability, the compressive strength and the water penetration depth under pressure for concrete incorporate with quarry waste as fine aggregate were investigated. The mix proportions of concrete were set into two classes of water to cement ratio (w/c = 0.4, 0.6). The first class (C1), the mix proportion is 1.0:0.6:2.0:4.0 (Cement: Water: Fine: Coarse). And the second class (C2), the mix proportion is 1.0:0.4:1.5:3.0 and adding the superplasticizer 1% of cement weight. The natural river sand, which use in concrete, was partially replaced by quarry dust at the rates of 0% (no quarry dust), 50% and 100 % by weight of fine aggregate. The results show that concrete containing quarry wastes as fine aggregate decreased the workability and do not significantly affect the 28-day compressive strength whereas concrete incorporating with quarry dusts reduces the water penetration depth.

scholarly journals INVESTIGATING ANTI CORROSION PROPERTIES OF NONWOVEN POLYESTER LAYER FINISHED BY GRAPHENE

2017 ◽  
pp. 95-101
Author(s):  
Oshaghi Hanieh ◽  
Mokhtari Ali
Keyword(s):  
Technological Progress ◽  
High Strength ◽  
Water Repellency ◽  
Water Penetration ◽  
Corrosion Properties ◽  
Corrosion Phenomenon ◽  
Fabric Strength ◽  
Prepared Composite ◽  
Industrial Needs ◽  
Different Thickness

Despite technological progress, the corrosion phenomenon has caused many problems and dangers, which are possible to control and decrease by coating metal surfaces and reducing their contact with the environment. The article presents the results of a research, where graphene is used as a key matter due to its unique characteristics: mechanical, electrical, anti-bacterial, flexibility and high resistance to chemicals. Polyester is also used for its good elastic properties, high strength, and water repellency. In the course of the study nonwoven polyester was coated with resin and graphene powder of different percentage and different thickness. Then, the iron was coated with the prepared composite, and finally, the prepared samples were examined for corrosion, fabric strength, anti-bacterial properties and fabric resistance against water penetration. The results show that the effective coating greatly improves the sample parameters. According to analysis of the tests results, the presence of resin with graphene improves properties of polyester. The composite tested is recommended to use as an antibacterial coating material against corrosion for industrial needs.

scholarly journals TEOS-Based Superhydrophobic Coating for the Protection of Stone-Built Cultural Heritage

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 135
Author(s):  
Fotios G. Adamopoulos ◽  
Evangelia C. Vouvoudi ◽  
Eleni Pavlidou ◽  
Dimitris S. Achilias ◽  
Ioannis Karapanagiotis
Keyword(s):  
Cultural Heritage ◽  
Water Repellency ◽  
Contact Angles ◽  
Tetraethyl Orthosilicate ◽  
Superhydrophobic Coating ◽  
Water Penetration ◽  
Wetting Properties ◽  
Aesthetic Appearance ◽  
Static Contact ◽  
Water Drops

Tetraethyl orthosilicate (TEOS) is extensively used in the conservation of stone-built cultural heritage, which is often subjected to water-induced degradation processes. The goal of this study was to produce and study a TEOS-based material with the ability to repel liquid water. A sol solution of TEOS and 1H,1H,2H,2H-perfluorooctyl triethoxysilane (FAS) was prepared and deposited on marble. The static contact angles (CAs) of water drops on the coated marble surface were >170° and the sliding angles (SA) were <5°, suggesting that superhydrophobicity and water repellency were achieved on the surface of the synthesized TEOS-based coating. FTIR and SEM-EDS were employed to characterize the produced coating. The latter offered good protection against water penetration by capillarity, reducing the breathability of marble only by a small extent and with practically no effect on its aesthetic appearance. The durability of the coating was evaluated through various tests that provided very promising results. Finally, the versatility of the method was demonstrated as the TEOS-based coating was successfully deposited onto glass, brass, wood, silicon, paper and silk, which obtained extreme wetting properties.

Experimental Study on Water Permeability of Rubber Aggregate Concrete

2019 ◽  
Vol 815 ◽  
pp. 235-240
Author(s):  
Jin Ting Bai ◽  
Zhong Quan Xue ◽  
Mei Zhou ◽  
Bin Wu
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Regression Analysis ◽  
Water Permeability ◽  
Penetration Resistance ◽  
Water Penetration ◽  
Aggregate Concrete ◽  
Aggregate Content ◽  
Binary Regression Analysis ◽  
Practical Engineering

In this paper, the water penetration resistance of rubber aggregate concrete is studied by using the water penetration height method. The experiment results show that: Under the condition of the same dosage, the greater the fineness module, the better the impermeability. Under the condition of the same particle size, the higher the dosage, the better the impermeability. Moreover, the strength of rubber aggregate concrete cannot determine its impermeability. The impermeability of rubber aggregate concrete is analyzed by binary regression analysis. The results show that: Rubber aggregate content and fineness module have obvious influence on the water permeability of concrete. The established permeability regression equation can estimate the permeability height of rubber aggregate concrete, which has certain guiding significance for practical engineering.

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