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

Tsang, Chehong; Shehata, Medhat; Lotfy, Abdurrahmaan

doi:10.3390/ma9110878

Cited by 33 publications

(14 citation statements)

References 14 publications

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“…Erhan Guneyisi [7] reported that adding recycled aggregate to pervious concrete can improve its permeability. Pervious concrete is widely used in pavement engineering, and it has the advantages of reducing noise, reducing water accumulation, improving the environment, and supplementing groundwater sources [8,9]. It has strong gas permeability, the porosity is usually sizes less than 5 mm were screened.…”

Section: Introductionmentioning

confidence: 99%

Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers

et al. 2020

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Pervious concrete is considered to be porous concrete because of its pore structure and excellent permeability. In general, larger porosity will increase the permeability coefficient, but will significantly decrease the compressive strength. The effects of water-cement ratio, fiber types, and fiber content on the permeability coefficient, porosity, compressive strength, and flexural strength were investigated. The pore tortuosity of the pervious concrete was determined by volumetric analysis and two-dimensional cross-sectional image analysis. The concept and calculation method of porosity tortuosity were further proposed. Results show that the permeability coefficient of the pervious concrete is the most suitable with a water-cement ratio of 0.30; the water permeability of the pervious concrete is influenced by fiber diameter. The permeability coefficient of pervious concrete with polypropylene thick fiber (PPTF) is greater than that with copper coated steel fiber (CCF) and the polypropylene fiber (PPF). The permeability coefficient is related to tortuosity and porosity, but when porosity is the same, the permeability coefficient may be different. Finally, general relations between the permeability coefficient and porosity tortuosity are constructed.

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Section: Introductionmentioning

confidence: 99%

Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers

et al. 2020

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“…The use of natural aggregates is currently widespread in the manufacture of PC [6], but few studies have used RA [7]. As important quantities of construction and demolition waste are contaminating many ecosystems worldwide, it is imperative to recycle them and produce new building materials, recycled concrete [8].…”

Section: Introductionmentioning

confidence: 99%

SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Chinchillas-Chinchillas

Rosas-Casarez

Arredondo-Rea

et al. 2019

Materials

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Recycled aggregates (RA) from construction and demolition can be used in permeable concretes (PC), improving the environment. PCs have a significant porous network, their cement paste and the interaction between the paste and the RA establishing their strength. Therefore, it is important to evaluate the porosity in the interfacial transition zones. The porosity of the cement paste, the aggregate and the interfacial transitional zones (ITZ) of a PC with recycled coarse aggregates (RCA) and silica fume (SF) is measured by means of image analysis–scanning electron microscope (IA)-(SEM) and by mapping the chemical elements with an SEM-EDS (energy dispersive spectrometer) detector microanalysis linked to the SEM and, as a contrast, the mercury intrusion porosimetry technique (MIP). In the IA process, a “mask” was created for the aggregate and another for the paste, which determined the porosity percentage (for the anhydrous material and the products of hydration). The results showed that using SF caused a reduction (32%) in the cement paste porosity in comparison with the PC with RA. The use of RA in the PC led to a significant increase (190%) in the porosity at different thicknesses of ITZ compared with the reference PC. Finally, the MIP study shows that the use of SF caused a decrease in the micropores, mesopores and macropores.

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“…The destruction of C2 and C3 was in the form of a spatter on the concrete's surface and, according to the literature [1,6,[8][9][10], covered only the surface layer of the hardened cement paste, which has a thickness of several millimeters. However, in C4, scaling of the top layer's surface took place until the 49th cycle and was followed by volumetric destruction.…”

Section: The Effect Of the Sp On The Scaling Resistancementioning

confidence: 99%

“…This destruction is most often manifested by chipping on the concrete's surface. Even when the structure is destroyed due to the very strong effects of a freeze-thaw cycle when thawing agents are used, such destruction only covers the hardened cement paste's surface layer, which has a thickness of several millimeters [1,6,[8][9][10]. The mechanism that underlies the destruction of concrete as a result of peeling is different from the volumetric effect of a freeze-thaw cycle, which occurs as a result of internal crystallization and causes a decrease in strength [4,11].…”

Section: Introductionmentioning

confidence: 99%

Additional Porosity as a Side Effect of Polycarboxylate Addition and Its Influence on Concrete’s Scaling Resistance

Nowak-Michta

2020

Materials

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A side effect of using modified polycarboxylates to liquefy a concrete mix is additional pores in the concrete. They change the air void system in hardened concretes, and can be used to evaluate the freeze–thaw resistance of concretes. The purpose of this study is to determine the impact of the abovementioned quantitative and qualitative parameters on the freeze–thaw resistance of concretes. The research program was performed on eight sets of air-entraining and non-air-entraining concretes with a variable content of superplasticizer based on modified polycarboxylates. The basic composition of and air-entraining admixture content in the air-entraining concrete mixtures were held constant. Pore structure tests were performed according to EN 480-11. Scaling resistance was determined according to PKN-CEN/TS 12390-9. The results showed that as the content of modified polycarboxylates increased, the pore structure was adversely affected, and, consequently, the air void parameters deteriorated. At the same time, the freeze–thaw resistance of the non-air-entraining concretes decreased. The pores sizes also changed. As the fluidity increased, the specific surface area decreased, and, consequently, the spacing factor increased. The air-entraining concretes, despite the deterioration in the pore structure due to the modified polycarboxylates, were found to be very good quality concretes after 56 freeze–thaw cycles in the presence of 3% NaCl.

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

Cited by 33 publications

References 14 publications

Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers

Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers

SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Additional Porosity as a Side Effect of Polycarboxylate Addition and Its Influence on Concrete’s Scaling Resistance

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