Analysis of the relationship between particle size distribution of α-calcium sulfate hemihydrate and compressive strength of set plaster—Using grey model

Guan, Baohong; Ye, Qingqing; Wu, Zhongbiao; Lou, Wenbin; Yang, Lei

doi:10.1016/j.powtec.2010.02.015

Cited by 36 publications

(25 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The α-form is an especially valuable building material due to its enhanced mechanical properties after rehydration. The strength of the obtained plaster and the amount of water needed for setting depends on the particle size distribution [2,3]. For example, the modulus of rupture of commercial α-hemihydrate was reported to be approximately 2 MN/m 2 higher than that of the more commonly used β-hemihydrate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The crystal growth kinetics of alpha calcium sulfate hemihydrate in concentrated CaCl2–HCl solutions

Feldmann

Demopoulos²

2012

Journal of Crystal Growth

View full text Add to dashboard Cite

The crystal growth kinetics of calcium sulfate α-hemihydrate (α-HH) in nearly constant supersaturated HCl-CaCl 2 solutions were investigated. Two types of solutions were used, the first had a low HCl (1.4 mol/L) and high CaCl 2 (2.8 mol/L) concentration and the second had a high HCl (5.6 mol/L) and low CaCl 2 (0.7 mol/L) concentration. These conditions were chosen to represent the first and last stage of a newly developed stage-wise HCl regeneration process. The seeded growth experiments were carried out in a stirred, temperature controlled semi-batch reactor in which supersaturation was kept constant by simultaneous addition of CaCl 2 and Na 2 SO 4 solutions. The influence of the following parameters on α-HH crystal growth was studied: temperature (70-95°C), specific power input of stirring (0.02-1.29 W/kg) and equimolar inflow rate of CaCl 2 and Na 2 SO 4 (0-0.6 mol/h). The crystal growth rate was derived from particle size distribution measurements made with the laser light diffraction technique. It was found that the surface area normalized crystal growth rate increased linearly with the molar inflow rate up to 0.3 mol/h, at higher inflow rates no further increase of the growth rate was observed. Temperature and specific power input, within the investigated ranges, did not show a marked effect on the growth rate, attributable to a diffusion/adsorption controlled growth process. An interesting finding of the present research is the establishment of a positive relationship between the narrowing of the width of the particle size distribution with increasing crystal growth rate. The results show that the resulting particle size distribution is positively related to the reagent inflow rate, a finding that can be applied to the industrial design and scale-up of the α-HH crystallization/HCl regeneration process.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Another approach to the production of α-HH is taken with the Omega process [16,17], in which SO 2 gas from power plant gases is contacted with a Ca(OH) 2 solution. This results in a calcium sulfite slurry that is continuously fed to an autoclave and mixed with sulfuric acid solution to adjust the pH to a controlled end point.…”

Section: Introductionmentioning

confidence: 99%

The crystal growth kinetics of alpha calcium sulfate hemihydrate in concentrated CaCl2–HCl solutions

Feldmann

Demopoulos²

2012

Journal of Crystal Growth

View full text Add to dashboard Cite

show abstract

“…This induces a small volume of voids inside the material and a better compressive strength. Guan et al . discussed the relationship between the particle size distribution of CSH and the compressive strength of CSD.…”

Section: Discussionmentioning

confidence: 99%

Effect of Particle Size Ratios on the Physical and Chemical Properties of Surgical‐Grade Calcium Sulfate Hemihydrate

Lun

Wang

et al. 2019

Orthopaedic Surgery

View full text Add to dashboard Cite

Objectives To analyze the optimum particle size or formula ratio of surgical‐grade calcium sulfate (CS) for appropriate compressive strength, setting time, and vitro degradation rate. Methods Three types of calcium sulfate hemihydrate (CSH) particles with diameters of 0–37.5 μm, 37.5–75 μm, and >75 μm were screened. Based on formulation ratio of different particles, this topic is divided into 10 groups by the unconstrained third‐order simplex lattice mixing design scheme in formula design experiment. The optimum formulation ratio of particle diameter for compressive strength, solidification time, and degradation rate in vitro was analyzed. Results When the percentage of the particle diameter of CS with 0–37.5 μm, 37.5–75 μm and >75 μm are 55.0%, 17.4%, and 27.6% respectively, the compressive strength of the test sample is the highest, which is 14.16 MPa. When the percentage of the particle diameter of CS with 0–37.5 μm, 37.5–75 μm, and >75 μm are 0.00%, 0.00%, and 100.00% respectively, the initial setting time of the sample is the longest, which is 410.0 s. When the percentage of the particle diameter of CS with 0–37.5 μm, 37.5–75 μm, and >75 μm are 0.00%, 0.00%, and 100.00% respectively, the final setting time of the sample is the largest, and the final setting time of the sample is 460.00 s. When the percentage of the particle diameter of CS with 0–37.5 μm, 37.5–75 μm, and >75 μm are 0.00%, 0.00%, and 100.00% respectively, the degradation rate of the sample in vitro is the slowest, which is 18.8%. Conclusion The morphological structure of surgical‐grade CS can affect compressive strength, setting time, and in vitro degradation rate. Surgical CS should be prepared based on different uses.

show abstract

“…The physical properties of the raw duck eggshell and calcium sulfate samples, i.e. particle size and shape, specific surface area, true density, solubility, etc., are important factors for calcium sulfate formation and applications [6,29,30].…”

Section: Physical Properties and Microstructures Of Calcium Sulfate Pmentioning

confidence: 99%

Bio-calcium sulfate preparation from duck eggshell via chemical reaction process

Unjan¹,

Tangboriboon²

2017

Int j curr adv res

View full text Add to dashboard Cite

Analysis of the relationship between particle size distribution of α-calcium sulfate hemihydrate and compressive strength of set plaster—Using grey model

Cited by 36 publications

References 23 publications

The crystal growth kinetics of alpha calcium sulfate hemihydrate in concentrated CaCl2–HCl solutions

The crystal growth kinetics of alpha calcium sulfate hemihydrate in concentrated CaCl2–HCl solutions

Effect of Particle Size Ratios on the Physical and Chemical Properties of Surgical‐Grade Calcium Sulfate Hemihydrate

Bio-calcium sulfate preparation from duck eggshell via chemical reaction process

Contact Info

Product

Resources

About