scholarly journals Optimizing a Test Method to Evaluate Resistance of Pervious Concrete to Cycles of Freezing and Thawing in the Presence of Different Deicing Salts

Materials ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 878 ◽  
Author(s):  
Chehong Tsang ◽  
Medhat Shehata ◽  
Abdurrahmaan Lotfy
Keyword(s):  
Test Method ◽  
Pervious Concrete ◽  
Freezing And Thawing ◽  
Deicing Salts

scholarly journals Optimizing a Test Method to Evaluate Resistance of Pervious Concrete to Cycles of Freezing and Thawing in the Presence of Different Deicing Salts

2021 ◽  
Author(s):  
Chehong Tsang ◽  
Medhat H. Shehata ◽  
Abdurrahmaan Lotfy
Keyword(s):  
Potassium Acetate ◽  
Standard Test ◽  
Test Method ◽  
Pervious Concrete ◽  
Cycle Duration ◽  
Freezing And Thawing ◽  
Deicing Salts ◽  
Temperature Ranges ◽  
Calcium Magnesium

The lack of a standard test method for evaluating the resistance of pervious concrete to cycles of freezing and thawing in the presence of deicing salts is the motive behind this study. Different sample size and geometry, cycle duration, and level of submersion in brine solutions were investigated to achieve an optimized test method. The optimized test method was able to produce different levels of damage when different types of deicing salts were used. The optimized duration of one cycle was found to be 24 h with twelve hours of freezing at −18 °C and twelve hours of thawing at +21 °C, with the bottom 10 mm of the sample submerged in the brine solution. Cylinder samples with a diameter of 100 mm and height of 150 mm were used and found to produce similar results to 150 mm-cubes. Based on the obtained results a mass loss of 3%–5% is proposed as a failure criterion of cylindrical samples. For the materials and within the cycles of freezing/thawing investigated here, the deicers that caused the most damage were NaCl, CaCl2 and urea, followed by MgCl2, potassium acetate, sodium acetate and calcium-magnesium acetate. More testing is needed to validate the effects of different deicers under long term exposures and different temperature ranges.

Durability of concrete containing chloride-based accelerating admixtures

1990 ◽  
Vol 17 (1) ◽  
pp. 102-112
Author(s):  
T. Rezansoff ◽  
D. Stott
Keyword(s):  
Calcium Chloride ◽  
Dynamic Modulus ◽  
Linseed Oil ◽  
Standard Test ◽  
Test Method ◽  
Concrete Durability ◽  
Freezing And Thawing ◽  
Cement Ratio ◽  
Freeze Thaw ◽  
Water To Cement Ratio

The influence of CaCl2 or a chloride-based accelerating admixture on the freeze–thaw resistance of concrete was evaluated. Three air entrained mix designs were investigated using ASTM C666-84, Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing. All mix designs were similar, using cement contents of 340–357 kg/m3 of concrete, except for the addition of either 2% calcium chloride or 2% High Early Pozzolith, while no accelerating admixture was added to the control mix. The entire test program was repeated four times with water-to-cement ratio of 0.46 and three times with the ratio of 0.43. For the Pozzolith-accelerated concrete, half the samples were coated with boiled linseed oil in all seven series. For the control (unaccelerated) concrete, half the samples were coated with boiled linseed oil in one series for each water-to-cement ratio. Performance was monitored using the dynamic modulus of elasticity as obtained from transverse resonant frequency measurements. Weight loss of the specimens was also measured. Only the control samples (no accelerators) showed sufficient durability to satisfy the standard of maintaining at least 60% of the original dynamic modulus after 300 cycles of alternate freezing and thawing. Sealing with linseed oil showed inconsistent improvement in the durability in the various test series when defined in terms of the dynamic modulus; however, weight losses were the lowest of all categories and surface scaling was minimal. Key words: concrete, durability, freeze–thaw testing, calcium chloride, admixtures, sealants, air void system.

Laboratory Freezing-and-Thawing Durability of Fly Ash Pervious Concrete in a Simulated Field Environment

2015 ◽  
Vol 112 (5) ◽  
Author(s):  
Ian Anderson ◽  
Mandar M. Dewoolkar
Keyword(s):  
Fly Ash ◽  
Pervious Concrete ◽  
Freezing And Thawing ◽  
Field Environment ◽  
Simulated Field

An Alternate Test Method for the Void Content of Pervious Concrete

2016 ◽  
Vol 5 (1) ◽  
pp. 20150022
Author(s):  
A. Torres ◽  
J. Hu
Keyword(s):  
Test Method ◽  
Pervious Concrete ◽  
Void Content ◽  
Alternate Test
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