Modeling of Parameters Affecting Physical Salt Attack of Concrete

2021 ◽  
Vol 118 (2) ◽  
Keyword(s):  
Physical Salt Attack

Effect of Coatings on Concrete Resistance to Physical Salt Attack

2019 ◽  
Vol 116 (6) ◽  
Author(s):  
M. R. Sakr ◽  
M. T. Bassuoni ◽  
M. Reda Taha
Keyword(s):  
Physical Salt Attack

scholarly journals The Impact of Long-Term Physical Salt Attack and Multicycle Temperature Gradient on the Mechanical Properties of Spun Concrete

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4811
Author(s):  
Romualdas Kliukas ◽  
Arūnas Jaras ◽  
Ona Lukoševičienė
Keyword(s):  
Mechanical Properties ◽  
Temperature Gradient ◽  
Ambient Conditions ◽  
Chemical Admixtures ◽  
Cyclic Temperature ◽  
Spun Concrete ◽  
Physical Salt Attack ◽  
The Impact ◽  
Positive Effect

The article is focused on spun concrete made with different chemical admixtures under long-term exposure to aggressive salt-saturated ground water and a cyclic temperature gradient. Over a long-term experimental investigation, 64 prismatic spun concrete specimens were subjected to multicycle (75–120) processing under combined aggressive ambient conditions. Prismatic specimens were soaked in water or saline and dried at a temperature of 45–50 °C. The long-term multi-cycle effect of the temperature gradient and physical salt attack on the compressive strength, Young’s modulus and durability of concrete was found to be negative. Chemical admixtures, though, improved the structure of spun concrete, thus having a significant positive effect on its physical-mechanical properties and durability.

Durability of Concrete Superficially Treated with Nano-Silica and Silane/Nano-Clay Coatings

2020 ◽  
pp. 036119812095316
Author(s):  
M. R. Sakr ◽  
M. T. Bassuoni ◽  
A. Ghazy
Keyword(s):  
Surface Damage ◽  
Ambient Conditions ◽  
Nano Silica ◽  
Neat Resin ◽  
Nano Clay ◽  
Loading Ratio ◽  
Improved Performance ◽  
Physical Salt Attack ◽  
Concrete Elements ◽  
Low Dosage

Protection of the surface layer of concrete is essential for achieving durability and functionality of concrete elements during their service life. In this paper, an effort is made to utilize colloidal nano-silica (5%–50%) and a synthesized nanocomposite as superficial treatments for concrete; silane was used as the neat resin to disperse nano-montmorillonite particles at different dosages (5% and 10%). The coatings were applied to a typical concrete mixture used for residential concrete in North America. The transport properties of the treated concrete were characterized using the rapid chloride penetrability test and the absorption/desorption percentages. Moreover, concrete was evaluated under severe durability exposure involving physical salt attack (PSA), which is a wetting/drying regime responsible for surface damage of concrete elements subjected to continuous salt supply along with cyclic ambient conditions. Deterioration was visually assessed and quantified using mass change. In addition, thermal and microscopy analyses were performed on concrete specimens to elucidate the mechanisms of enhancement by surface treatment. The results showed that increasing the concentration of nano-silica particles in the colloid led to an improved performance of concrete, with the 50% loading ratio achieving the least penetration depth, absorption/desorption percentage, and mass loss of concrete under aggravated PSA. For the silane/nano-clay composite, the low dosage of nano-clay was adequate to mitigate the damage caused by PSA on concrete.

scholarly journals The Reinforced Spun Concrete Poles under Physical Salt Attack and Temperature: A Case Study of the Effectiveness of Chemical Admixtures

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5111
Author(s):  
Romualdas Kliukas ◽  
Arūnas Jaras ◽  
Ona Lukoševičienė
Keyword(s):  
Transmission Lines ◽  
Environmental Conditions ◽  
Experimental Program ◽  
Initial Water ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Chemical Admixtures ◽  
Spun Concrete ◽  
Physical Salt Attack

The present paper focused on the investigation of the effectiveness of using various chemical admixtures and their effect on the strength and deformability of the reinforced spun concrete members—the supporting poles of the overhead power transmission lines—under the unfavorable long-term combined action of the aggressive salt-saturated groundwater and the temperature changes. According to the long-term experimental program, 96 prismatic spun concrete specimens were subjected to multi-cycle (25-50-75 cycles) processing under the combined aggressive environmental conditions. It has been found that chemical admixtures which decrease the initial water-cement ratio produce a considerable positive effect on the mechanical properties of spun concrete used in hot and arid climates and exposed to physical salt attack (PSA). Superplasticizers decrease the initial water-cement ratio the most, and, due to a unique concrete compaction method used, they produce the most homogeneous and dense concrete structure. They can be recommended as most effective in increasing the durability of spun concrete used under the above-mentioned aggressive environmental conditions.

Physical Salt Attack on Concrete: Mechanisms, Influential Factors, and Protection

2020 ◽  
Vol 117 (6) ◽  
Author(s):  
M. R. Sakr ◽  
M. T. Bassuoni ◽  
R. D. Hooton ◽  
T. Drimalas ◽  
H. Haynes ◽  
...  
Keyword(s):  
Influential Factors ◽  
Physical Salt Attack
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