Effect of different types of calcium sulfate on the reactivity of cement/Fe(II) system in dechlorination of trichloroethylene

Ghorpade, Praveen A.; Ha, Min-Gyu; Park, Joo-Yang

doi:10.1080/19443994.2014.950342

Cited by 4 publications

(7 citation statements)

References 17 publications

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“…The [14]. The dosage of dihydrate form of calcium sulfate and anhydrate (insoluble) form of calcium sulfate was kept at 5% and was added to clinker separately in two glass bottles.…”

Section: Methodsmentioning

confidence: 99%

“…Series of batch experiments were performed to determine the removal of fluoride using four types of cement, cement [14] the highest reactivity in the reduction in pollutant. However, the present study contradicts the findings.…”

Section: Fluoride Removal Efficiency Of Different Types Of Cementsmentioning

confidence: 99%

“…Types of cement have been previously used for the removal of organic contaminants like trichloroethylene (TCE) [14] and other anionic pollutants like nitrates, arsenic and phosphates [15,16]. Cured cement paste powder has been utilized for the treatment of high fluoride concentration coming from fertilizer industries and semiconductor fabrications [17].…”

Section: Introductionmentioning

confidence: 99%

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A novel cement-based technology for the treatment of fluoride ions

et al. 2020

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Previous studies have confirmed the effective removal of fluoride by cured cement paste powder from wastewaters originating from semiconductor and fertilizer industries. However, the mineralogical changes taking place in cement paste during fluoride removal were not reported. There is need to understand the significance of cement hydration products and performance of different types of cements in fluoride removal. The present study shows the fluoride removal efficiency using different types of cement, such as cement containing calcium sulfate dihydrate, cement containing calcium sulfate anhydrate, clinker and Ordinary Portland Cement (OPC). OPC gave the best result with 61.1% of fluoride removal efficiency within 5 h of reaction time, and reduction the followed pseudo-first-order kinetics. Further, the column studies were carried out using granules of OPC run under two different conditions, by passing the solution containing only fluoride ions and another condition in which the mixture of fluoride and nitrate was passed to see the reduction efficiencies of OPC granules. The results showed a 91% reduction in fluoride ions on fourth day of cement hydration in former condition; however, the reduction was less when mixture was passed. Further, to understand the mineralogical and morphological changes in cement during anionic removal reactions, analytical tools such as X-ray diffraction (XRD) and scanning electron microscope (SEM) were used.

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“…The [14]. The dosage of dihydrate form of calcium sulfate and anhydrate (insoluble) form of calcium sulfate was kept at 5% and was added to clinker separately in two glass bottles.…”

Section: Methodsmentioning

confidence: 99%

Section: Fluoride Removal Efficiency Of Different Types Of Cementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel cement-based technology for the treatment of fluoride ions

et al. 2020

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“…Also, the presence of calcium sulfate in mixing water has been found to increase the setting time. However, the rate of increase is reduced when a higher concentration of calcium sulfate is present in the mixing water [42]. Moreover, it was reported that mixing water with high pH increases the setting time of paste drastically.…”

Section: Initial Setting Time Of Cement Pastementioning

confidence: 99%

“…The higher the alkalinity, the more accelerated the setting times. This accelerated setting time has been attributed to the formation of gyrolite [42]. The presence of sulphuric acid or hydrochloric acid has been found to decrease the initial and final setting time of paste [43].…”

Section: Initial Setting Time Of Cement Pastementioning

confidence: 99%

Reinforced concrete deterioration caused by contaminated construction water: An overview

Awoyera

Adesina

Olalusi

et al. 2020

Engineering Failure Analysis

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Over the years, there were cases of building failures in most developing countries of the world that have led to the loss of lives and property. Yet, most investigations conducted on the causes of building failures have suggested poor design, inadequate supervision, and the use of inferior materials as the factors responsible for the failures. However, not so much emphasis has been placed on concrete mixing water as a contributing factor to the failures. Therefore, this review summarizes the effect of the type and composition of mixing water on the properties of concrete. Different sources of water that can be used to mix concrete were explored, alongside with the effect on fresh and hardened properties of concrete. The fresh properties of concrete, such as setting time and slump, were examined, while the hardened properties focused on the strength and durability of the concrete. A brief statement on the available regulation and standards for mixing water was also reported. This review shows the viability of using water from different sources, such as wastewater, to mix concrete successfully. However, the treatment of some types of water might be required to ensure that excellent strength and durability properties are achieved while preventing any threat to human life and the environment. Area for future research was also suggested, which, among other procedures, could help proffer solutions to the challenge of building failures in developing countries.

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