scholarly journals EFFECT OF MIXING TIME ON THE SALT SCALING RESISTANCE OF CONCRETE WITH MICROSPHERES

2017 ◽  
Vol 71 (1) ◽  
pp. 373-378
Author(s):  
Yuto TANAKADATE ◽  
Shunsuke HANEHARA ◽  
Tetsuya OYAMADA ◽  
Kazuma IGARASHI
Keyword(s):  
Mixing Time ◽  
Salt Scaling ◽  
Scaling Resistance

Deicing salt scaling resistance of concrete incorporating supplementary cementing materials: laboratory and field test data

2008 ◽  
Vol 35 (11) ◽  
pp. 1261-1275 ◽  
Author(s):  
N. Bouzoubaâ ◽  
A. Bilodeau ◽  
B. Fournier ◽  
R. D. Hooton ◽  
R. Gagné ◽  
...  
Keyword(s):  
Field Evaluation ◽  
Outdoor Exposure ◽  
Test Procedures ◽  
Visual Evaluation ◽  
Deicing Salt ◽  
Supplementary Cementing Materials ◽  
Salt Scaling ◽  
Concrete Mixtures ◽  
Scaling Resistance ◽  
Made In

In this study, sidewalk sections were made in the field using seven concrete mixtures, applying a finishing and curing practice that is commonly used in Montréal, Canada. For each of the sidewalk sections, large slabs (1.2 m × 1.2 m) were cast from which specimens were cored and tested in the laboratory for determining their basic mechanical properties and deicing salt scaling resistance following ASTM C672 test procedures. Also, during the casting of the sidewalk, companion specimens were cast on site, using concrete from the same batch, and were subjected to the same tests as the “cored” specimens. The resistance to deicing salt scaling of these “laboratory specimens” was evaluated according to ASTM C672 and to BNQ NQ 2621–900 (2002 standard of the province of Quebec, Canada) test procedures. The results were compared with the performance of the sidewalk sections after four winters of outdoor exposure. The visual evaluation of the sidewalks after four winters has confirmed the severity of the ASTM C672 procedure and the adequateness of the BNQ procedure to better evaluate the deicing salt scaling resistance of concrete made with supplementary cementing materials (SCMs). The field evaluation should, however, continue for a longer period of time to increase the confidence in the BNQ test or to allow for changes as needed.

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 Effect of Recycled Rubber Particles on the Deicing Salt-Scaling Durability of Concrete

2021 ◽  
Vol 03 (03) ◽  
pp. 1-1
Author(s):  
Layachi Guelmine ◽  
◽  
Hadda Hadjab ◽  
Keyword(s):  
Partial Substitution ◽  
Dune Sand ◽  
Ordinary Concrete ◽  
Salt Scaling ◽  
Cement Based Materials ◽  
Rubber Particles ◽  
Recycled Rubber ◽  
Natural Dune ◽  
Rubber Concrete ◽  
Scaling Resistance

The present study investigated the effect of reused rubber particles (RRP) on the deicer salt durability of ordinary concrete. Four mixtures were designed, a control concrete (CC) and three other rubber concretes obtained by partial substitution of natural dune sand aggregate with reused rubber particles with 0%, 3%, 6%, and 9% w/w. All studied concretes were subjected to the combined effect of freeze/thaw (56 and 120) cycles with the deicer salt solution of 3% NaCl. The results indicated that RRP improved the deicer-salt scaling resistance of rubber concrete strongly compared with the control. The observed innovative property of RRP could be applied to cement-based materials to improve their deicer salt durability. Further, this environmentally friendly practice could reduce the stock of waste tires and offer a renewable source of construction aggregates.

scholarly journals Effects of Curing Method on Properties and Salt-Scaling Resistance of Concrete under Lab Testing

2021 ◽  
Author(s):  
Greg Richards ◽  
Medhat Shehata
Keyword(s):  
Fly Ash ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Alkali Concentration ◽  
Salt Scaling ◽  
High Calcium ◽  
Curing Methods ◽  
Curing Method ◽  
High Alkali ◽  
Scaling Resistance

This paper presents a study of the effect of curing on the salt-scaling resistance of concrete containing supplementary cementitious materials (SCMs) under lab conditions. Two curing methods were examined: moist curing and wrapping in a tight plastic sheet. Wrapping concrete slabs in plastic was adopted to represent curing methods that do not supply the concrete with additional water. The two curing methods produced different scaling results; however, the outcomes did not change in terms of meeting or failing the acceptance limit. Curing in plastic wraps produced higher carbonation depth prior to exposing the sample to the salt solution. This could have contributed, partly, to the higher scaling obtained in wrapped samples, other than the sample with 40% high-calcium fly ash. For this sample, there is evidence that curing using plastic wraps maintained high alkali concentration in the surface concrete, which could have enhanced the pozzolanic activity of the fly ash at the surface.

scholarly journals Properties of concrete containing recycled concrete aggregate of preserved quality

2021 ◽  
Author(s):  
Jonathan Andal
Keyword(s):  
Coarse Aggregate ◽  
Drying Shrinkage ◽  
Recycled Concrete ◽  
Partial Replacement ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Salt Scaling ◽  
Concrete Properties ◽  
Comparable Quality ◽  
Scaling Resistance

Today, there is a growing need for the implementation of sustainability in construction. Continuous construction and rehabilitation projects have begun to deplete virgin aggregate sources. The use of recycled concrete aggregate (RCA) in concrete has been regarded as a sustainable and environmentally friendly alternative aggregate source. This thesis focuses on producing RCA of preserved quality through the use of a new protocol aimed at maintaining the original properties of returned-to-plant concrete. The performance of RCA with preserved quality and commercially available RCA when used in concrete was compared. Different concrete properties were evaluated including the fresh, hardened and durability characteristics. Results showed that the RCA with preserved quality performed better in many categories, including strength, drying shrinkage and salt scaling resistance compared to the commercial RCA. The use of 30% preserved-quality RCA as partial replacement of coarse aggregate produced concrete of comparable quality to that produced with virgin aggregate.

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