Modifications in water resistance and engineering properties of β-calcium sulphate hemihydrate plaster-superplasticizer blends

Garg, Man Mohan; Pundir, Aakanksha; Singh, Randhir

doi:10.1617/s11527-015-0717-0

Cited by 41 publications

(12 citation statements)

References 24 publications

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“…In Fig. 9 it is noticed that there was the appearance of numerous superficial pores due to the dissolution of the plaster, which was 2 g/L [1]. As the amount of waterrepellent incorporated into the plaster increased, there was a reduction in the dissolution and, consequently, a smaller amount of pores on the surface of the material, as shown in Figs.…”

Section: Resultsmentioning

confidence: 88%

“…Plaster, a calcium sulfate hemihydrate (CaSO 4 .1/2H 2 O) is an aerial binder, obtained from the calcination of the mineral gypsum. The use of surface plaster in civil construction has become increasingly intense due to the ease of finishing, molding, and thermal and acoustic insulation behavior [1]. In addition, the Gesseiro pole, in the Araripe region, in Pernambuco state (Brazil), also uses this material in the production of blocks and slabs.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of plaster with water-repellent additive under natural aging

et al. 2022

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This research evaluates the behavior of plaster with a water-repellent additive when submitted to a natural aging process. Casting plaster and silane/siloxane-based water-repellent were used as materials. The water/plaster ratio was set at 0.7 and the contents of 0.2% and 0.4% of water-repellent were used, in relation to the plaster mass. Plaster pastes without water-repellent (reference) and containing mass water-repellent were evaluated at 'zero' age and after 30, 60, 90, 120, and 150 days of natural aging. After 150 days of natural aging, it was observed that the mechanical properties of the material (compressive strength and hardness) did not undergo significant variations and remained above the minimum required by a standard. The addition of water-repellent resulted in a considerable reduction in water absorption, demonstrating the water repellency capacity of the material, compared to the reference specimen.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Behavior of plaster with water-repellent additive under natural aging

et al. 2022

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“…With another focus, Yang and Qian [ 62 ] calcined PG at 500 °C for 4 h. Garg et al [ 63 ] calcined PG at 150 °C for 4 h. Singh [ 64 ] calcined PG at 160 °C for 4 h. Singh and Garg [ 65 ] calcined PG at 750 °C for 4 h. Taher [ 20 ] calcined Egyptian PG at temperatures of 200, 400, 600 and 800 °C for 2 h. At the same time as exploring the optimal temperature of roasting and impurity removal, they were also committed to improving the performance of PG as tailings. The experimental results showed that the pre heat treatment of PG could effectively improve the hydraulic properties of slag cement, and the best hydraulic properties of slag cement were from PG produced after 800 °C heat treatment.…”

Section: Removal Of Impurities In the Pgmentioning

confidence: 99%

The Generation Process, Impurity Removal and High-Value Utilization of Phosphogypsum Material

Liu

2022

Nanomaterials

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As phosphogypsum constitutes a large amount of solid waste material, its purification treatment and comprehensive utilization have close connection with economic development and ecological environmental protection. For the moment, the storage quantity of phosphogypsum is still rising as a result of the increasing phosphate fertilizer production to meet the food demand in China. This paper summarizes the generation process, impurity removal treatment (physical method, chemical method, heat method), high-value utilization (nanometer calcium sulfate whisker, nanometer calcium carbonate) of phosphogypsum material and some existing problems. It puts forward some views on the challenges in this field and the direction of future development. It is hoped that the investigation and summary in this paper could supply some significant information for the impurity removal and high-value utilization of phosphogypsum material as a contribution to sustainability.

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“…According to Indian Standard [31,32], molds for compressive strength test should be cubes of size 25 × 25 × 25 mm, and molds for flexural strength should be rectangular specimens of size 100 × 25 × 25 mm. e compressive and flexural strength were measured after keeping at room temperature for 24 h and then drying in an electric furnace for two days.…”

Section: Effect Of Fineness On Properties Of Commercial Gypsummentioning

confidence: 99%

Influence of the Heating Temperature and Fineness on the Hydration and Mechanical Property of Recycled Gypsum Plaster

Peng

et al. 2021

Advances in Materials Science and Engineering

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Influence of the heating temperature and fineness on the hydration and mechanical property of recycled gypsum plaster was investigated to find the suitable heating temperature and fineness. According to the results, the setting time of recycled gypsum plaster increased with the increase of heating temperature, and the mechanical strength increased first and then decreased at a temperature of 165°C. Therefore, the suitable heating temperature was 165°C, and at this time, the initial setting time and final setting time were 8 min and 12.5 min, respectively, which met the requirements of the Chinese standard of GB/T 9776-2008. The strength of recycled gypsum plaster increased with the increase of specific surface area, and the low water to plaster ratio and high strength were achieved when the specific surface area was 1526 m2/kg. Therefore, it can be concluded that the suitable heating temperature was 165°C and the suitable specific surface area was 1526 m2/kg considering the properties and economics of recycled gypsum plaster.

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Modifications in water resistance and engineering properties of β-calcium sulphate hemihydrate plaster-superplasticizer blends

Cited by 41 publications

References 24 publications

Behavior of plaster with water-repellent additive under natural aging

Behavior of plaster with water-repellent additive under natural aging

The Generation Process, Impurity Removal and High-Value Utilization of Phosphogypsum Material

Influence of the Heating Temperature and Fineness on the Hydration and Mechanical Property of Recycled Gypsum Plaster

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