Influence of Chloride Solution Concentration on Deicer Salt Scaling Deterioration of Concrete

10.14359/642 ◽  
1999 ◽  
Vol 96 (4) ◽  
Keyword(s):  
Chloride Solution ◽  
Solution Concentration ◽  
Salt Scaling ◽  
Deicer Salt Scaling

scholarly journals Experimental Study of the Microstructural Evolution of Glauberite and Its Weakening Mechanism under the Effect of Thermal-Hydrological-Chemical Coupling

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 99 ◽  
Author(s):  
Shuzhao Chen ◽  
Donghua Zhang ◽  
Tao Shang ◽  
Tao Meng
Keyword(s):  
Sodium Chloride ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Crack Nucleation ◽  
Chloride Concentration ◽  
Solution Concentration ◽  
Expansion Velocity ◽  
Research Subjects ◽  
Characteristic Index ◽  
Chemical Coupling

The microstructures of rock gradually evolve with changes in the external environment. This study focused on the microstructure evolution of glauberite and its weakening mechanism under different leaching conditions. The porosity were used as a characteristic index to study the effect of brine temperature and concentration on crack initiation and propagation in glauberite. The research subjects were specimens of ϕ3 × 10 mm cylindrical glauberite core, obtained from a bedded salt deposit buried more than 1000 m underground in the Yunying salt formation, China. The results showed that when the specimens were immersed in solution at low temperature, due to hydration impurities, cracks appeared spontaneously at the centre of the disc and the solution then penetrated the specimens via these cracks and dissolved the minerals around the crack lines. However, with an increase of temperature, the dissolution rate increased greatly, and crack nucleation and dissolved regions appeared simultaneously. When the specimens were immersed in a sodium chloride solution at the same concentration, the porosity s presented gradual upward trends with a rise in temperature, whereas, when the specimens were immersed in the sodium chloride solution at the same temperature, the porosity tended to decrease with the increase of sodium chloride concentration. In the process of leaching, the hydration of illite, montmorillonite, and the residual skeleton of glauberite led to the expansion of the specimen volume, thereby producing the cracks. The diameter expansion rate and the expansion velocity of the specimen increased with temperature increase, whereas, due to the common-ion effect, the porosity of the specimen decreases with the increase of sodium chloride solution concentration.

Frost Deicer Salt Scaling Testing of Concrete: Effect of Drying and Natural Weathering

1997 ◽  
Vol 19 (1) ◽  
pp. 8 ◽  
Author(s):  
RD Hooton ◽  
S Jacobsen ◽  
J Marchand ◽  
L Boisvert ◽  
M Pigeon ◽  
...  
Keyword(s):  
Natural Weathering ◽  
Salt Scaling ◽  
Deicer Salt Scaling

Precision of Tests for Assessment of the Deicer Salt Scaling Resistance of Concrete

1996 ◽  
Vol 18 (2) ◽  
pp. 85 ◽  
Author(s):  
RD Hooton ◽  
J Marchand ◽  
R Pleau ◽  
M Pigeon
Keyword(s):  
Salt Scaling ◽  
Scaling Resistance ◽  
Deicer Salt Scaling

scholarly journals Durability of concrete exposed to magnesium chloride anti-icing chemicals

2021 ◽  
Author(s):  
Sherry Sutherland
Keyword(s):  
Compressive Strength ◽  
High Temperatures ◽  
Low Temperatures ◽  
Magnesium Chloride ◽  
Initial Exposure ◽  
Salt Scaling ◽  
Early Results ◽  
Durability Of Concrete ◽  
Deicer Salt Scaling

The objective of this study was to determine if/how magnesium chloride (MgCl₂) influences the durability of typical sidewalk concrete being used in Ontario. The effects of MgCl₂ on deicer salt scaling were reviewed with the hypothesis that MgCl₂ at higher concentrations will cause more scaling. When the early results were inconclusive, the focus of this reearch was then moved to determining if initial exposure to NaCl was a contributing factor, and if the mechanism causing deterioration was due to exposure at high temperatures rather than low temperatures. Mortar specimens were examined for the influence of MgCl₂ on expansion and compressive strength. It was found that MgCl₂ had little effect on deicer salt scaling, but caused an increase in expansion and a decrease in compressive strength with increased MgCl₂ concentrations.

scholarly journals Bioprocessing of Waste Sago Pulp Fiber Based on Chloride Solution for Cellulose Isolation

2021 ◽  
Vol 12 (1) ◽  
pp. 441-449
Keyword(s):  
Chloride Solution ◽  
Crystal Size ◽  
Xrd Analysis ◽  
Solution Concentration ◽  
Sem Analysis ◽  
Pulp Fiber ◽  
Ir Absorption ◽  
Powder Size ◽  
Cellulose Content ◽  
Cellulose Surface

The utilization of chloride solution in the bioprocessing of sago pulp fiber waste (SPFW) aims to obtain high purity cellulose before its use in making bioethanol. Before the bioprocessing, SPFW with a powder size of 149 μm was immersed in 15% (v/v) NH4OH and 5% (v/v) H2O2 solution. Bioprocessing parameters reported in this study included bioprocessing time, chloride solution concentration, and bioprocessing temperature. Based on the optimization results, the SPFW bioprocessing for 5 hours using 4% hydrochloric acid and a temperature of 95oC was the optimum condition with the acquisition of cellulose content of 67%. SPFW cellulose was confirmed by the presence of specific IR absorption peaks at wave numbers 1429.4 cm-1, 1322.4 cm-1, 1157.3 cm-1, 1110 cm-1, and 897 cm-1. Scanning Electron Microscopy (SEM) analysis shows that bioprocessing using chloride solutions produces a porous, rough, and fibrous cellulose surface. Also, the fiber length is irregular with the irregular location. Based on XRD analysis, SPFW bioprocessing produced single-phase cellulose with a crystal size of 15 nm. Physically, the bioprocessing causes the discoloration of the sago pulp fiber to turn dark brown.

scholarly journals Durability of concrete exposed to magnesium chloride anti-icing chemicals

2021 ◽  
Author(s):  
Sherry Sutherland
Keyword(s):  
Compressive Strength ◽  
High Temperatures ◽  
Low Temperatures ◽  
Magnesium Chloride ◽  
Initial Exposure ◽  
Salt Scaling ◽  
Early Results ◽  
Durability Of Concrete ◽  
Deicer Salt Scaling

The objective of this study was to determine if/how magnesium chloride (MgCl₂) influences the durability of typical sidewalk concrete being used in Ontario. The effects of MgCl₂ on deicer salt scaling were reviewed with the hypothesis that MgCl₂ at higher concentrations will cause more scaling. When the early results were inconclusive, the focus of this reearch was then moved to determining if initial exposure to NaCl was a contributing factor, and if the mechanism causing deterioration was due to exposure at high temperatures rather than low temperatures. Mortar specimens were examined for the influence of MgCl₂ on expansion and compressive strength. It was found that MgCl₂ had little effect on deicer salt scaling, but caused an increase in expansion and a decrease in compressive strength with increased MgCl₂ concentrations.

Sign in / Sign up

Export Citation Format

Share Document