Evaluation of Water-Repelling Additives for Use in Concrete-Based Sanitary Sewer Infrastructure

Soroushian, Parviz; Chowdhury, Habibur; Ghebrab, Tewodros

doi:10.1061/(asce)1076-0342(2009)15:2(106)

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Due to the absence of standardised tests, in this study, the sulphuric acid attack was performed by immersing the specimens into an H 2 SO 4 solution (3% w/w) in hermetically closed containers. This procedure has been used in previous studies to analyse the effect of acidic environments on cement-based materials [23,24]. A high concentration of sulphuric acid was chosen in order to accelerate their effects on the mortars and obtain the same degradation in less exposure time [12].…”

Section: Methodsmentioning

confidence: 99%

“…Examples of such nanotechnologies are nano silica, nano alumina, titanium oxide, carbon nanotubes and polycarboxylates [18,19,20,21,22]. Water-repellent materials are also used to increase durability in acid attacks, since they reduce the affinity of capillary pore surfaces to moisture [23,24]. Examples of hydrophobic compounds used as admixtures are powdered stearates, oleates and products based on silanes and silicones [25,26,27].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Crystalline Admixtures on the Short-Term Behaviour of Mortars Exposed to Sulphuric Acid

et al. 2018

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Using durable materials is a sustainable solution for extending the lifetime of constructions. The use of crystalline admixtures makes cementitious materials more durable. They plug pores, capillary tracts and microcracks, blocking the entrance of water due to the formation of crystals that prevent the penetration of liquids. The literature has covered the performance of these admixtures on concrete, but studies on mortars are still scarce. The aim of this study is to investigate the effect of an aggressive environment (sulphuric acid solution—3 wt%) on mortars produced with different percentages of a crystalline admixture (1%, 1.5% and 2% by weight of cement content). Physical and mechanical properties were studied after immersing the mortars in a H2SO4 solution for 90 days. It was found that, after a 90-day sulphuric acid exposure, mortars with the crystalline admixture showed greater compressive strength than the control mortar, besides exhibiting lower mass loss. However, the crystalline admixture did not produce any significant effect on the capillary water absorption coefficient. In a nonaggressive environment, and in the short term, the crystalline admixture did not have a significant effect on the compressive strength, the capillary water absorption coefficient or the ultrasonic pulse velocity.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Crystalline Admixtures on the Short-Term Behaviour of Mortars Exposed to Sulphuric Acid

et al. 2018

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“…There is no standardised European methodology to evaluate the chemical resistance of cementitious materials. The methodology followed in this study for sulphuric acid exposure has already been used in previous studies [3,24,25]. The specimens were immersed in a solution (3% w/w) of sulphuric acid (H 2 SO 4 ), which was changed weekly.…”

Section: Manufacturing Of Specimens Curing Process and Sulphuric Acmentioning

confidence: 99%

“…Calcium compounds in these systems react with the acid solutions, resulting in the decomposition of hydration products and increasing the total porosity, subsequently accelerating the acid attack [45,46]. However, the water-repellent admixture (zinc stearate) was able to enhance the resistance to acid environments because they reduce the affinity of capillary pore surfaces to moisture and slow down mass loss [24]. However, in this study, the control mortar showed an insignificantincrease in compressive strength from 28 to 90 days (0.6%), while the other mortars showed an appreciable increase (about 4%observed in the mortars treated with ethyl silicate and nanosilica mortars).…”

Section: Mass Loss Caused By Sulphuric Acid Exposurementioning

confidence: 99%

Pore Structure Degradation of Different Cement Mortars Exposed to Sulphuric Acid

et al. 2019

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Acid attack causes the deterioration of construction material surfaces. The objective of this study was to investigate the degradation of different types of cement mortar in terms of variations in pore size distribution obtained by mercury intrusion porosimetry (MIP), mass loss, and compressive strength. The mortars were manufactured with nanosilica, zinc stearate, and an ethyl silicate coating. After curing (28 days), the samples were subjected to acid exposure for 90 days, immersed ina solution (3% w/w) of sulphuric acid (H2SO4). The results indicate that the mortars showed a more refined microstructure, with a higher proportion of smaller pores (<100 nm) compared to the control mortar. The 28-day and 90-day compressive strength variations of mortars were also determined by observing pronounced reduction due to the appearance of expansive compounds responsible for microcracking.

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“…The sulfuric acid attack was performed by immersing the specimens into a H 2 SO 4 solution (3% w/w) (Figure 3a,b) in hermetically closed containers, this procedure has been used in previous studies [30]. A high concentration of sulfuric acid was chosen in order to accelerate their effects on the mortars, and obtain the same degradation in less exposition time [1].…”

Section: Manufacturing and Curing Process Of The Mortars And Sulfuricmentioning

confidence: 99%

Exposing Sustainable Mortars with Nanosilica, Zinc Stearate, and Ethyl Silicate Coating to Sulfuric Acid Attack

et al. 2018

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Obtaining durable materials that lengthen the service life of constructions and thereby contribute to sustainability requires research into products that improve the durability of cementitious materials under aggressive conditions. This paper studies the effects of sulfuric acid exposure on four mortar types (control mortar, mortar with nanosilica, mortar with zinc stearate, and mortar with an ethyl silicate coating), and evaluates which of them have better performance against the acid attack. After 28 days of curing, the samples were exposed to a sulfuric acid attack by immersing them in a 3% w/w of H2SO4 solution. Physical changes (mass loss, ultrasonic pulse velocity, open porosity, and water absorption), and mechanical changes (compressive strength) were determined after the sulfuric acid exposure. A scanning electron microscope (SEM) was used to characterize the morphology of the surface mortars after the exposure. The control mortar had the highest compressive strength after the acid attack, although of the four types, the zinc stearate mortar showed the lowest percentage of strength loss. The zinc stearate mortar had the lowest mass loss after the acid exposure; moreover, it had the lowest capillary water absorption coefficient (demonstrating its hydrophobic effect) both in a non-aggressive environment and acid attack.

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Evaluation of Water-Repelling Additives for Use in Concrete-Based Sanitary Sewer Infrastructure

Cited by 9 publications

References 4 publications

Influence of Crystalline Admixtures on the Short-Term Behaviour of Mortars Exposed to Sulphuric Acid

Influence of Crystalline Admixtures on the Short-Term Behaviour of Mortars Exposed to Sulphuric Acid

Pore Structure Degradation of Different Cement Mortars Exposed to Sulphuric Acid

Exposing Sustainable Mortars with Nanosilica, Zinc Stearate, and Ethyl Silicate Coating to Sulfuric Acid Attack

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