Effects of different ball-milling parameters on the …

Phosphorus building gypsum can be obtained from phosphogypsum after high-thermal dehydration. This study aimed to analyze the influence of ball milling with different parameters on the strength...

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Study on Effect of Nano-CaCO3 on Properties of Phosphorus …

the optimum, with the absolute dry flexural strength and absolute dry compressive strength being increased to 8.1 MPa and 20.5 MPa, respectively, which were 50% and 24% higher than those of the

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Effects of several retarders on setting time and strength of …

The 1d absolute dry flexural and compressive strength of building gypsum with bone glue of 2.8% were tested. The results show that 1d absolute dry flexural and …

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Improvement on mechanical strength and water absorption …

crystals [3]; hence β-H requires more water than the α-H does in order to obtain a paste of standard consistency because it has much higher specific surface area.

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Strength Prediction of Ball-Milling-Modified Phosphorus Building Gypsum

Phosphogypsum is an industrial byproduct from the wet preparation of phosphoric acid. Phosphorus building gypsum can be obtained from phosphogypsum after high-thermal dehydration.

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Determination of parameters of dry building mixtures based on …

The fundamental points related to the smoothness of strength gain of the finished building composition have been determined. Recommendations for the use of regulators of the …

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Influence of crystal-transforming agent on the performance and

The maximum strength is 32 MPa after 2 h, the absolute dry compressive strength is up to 38 MPa, and the surface hardness is improved by 24.43%. Graphical abstract. Download: ... Refer to GB/T 17669.3–1999 ″Determination of Mechanical Properties of Building Gypsum". Take a 2 cm × 2 cm × 2 cm six-hole mould, brush with oil, and set aside ...

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Preparation of α-High Strength Gypsum from Flue Gas

76 Vol.39 S iin et al: Preparation of a-High Strength Gypsum from Flue Gas Desul... 3, and the highest absolute dry compressive strength reached 25.3 MPa. And after 8 cycles of mother liquor recycling, high-strength α-CSH crystals could still be prepared[12]. Jia et al reported that trace NaCl and Na

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Effect of modifiers on crystalizing habit and mechanical strength …

The 2 h flexural strength and absolute dry compressive strength of α-HHs with different modifiers all increased by comparation with the blank sample, and met the requirements of α30 in 《α-High strength gypsum plaster》(JC/T 2038–2010) [29]. The decrease of normal consistency and the increase of the well-crystallized crystals was the ...

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Determination of a partial phase composition in calcined …

b-gypsum has a significantly lower strength than a-gypsum, it is usually preferred for industrial purposes because the technology of its production is much simpler and more economical [1, 2]. From the chemical point of view, both these types of calcined gypsum are similar. However, they differ in the size of crystals and specific

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Molecular dynamics study on the interaction of phosphorus building

Phosphorus building gypsum [6, 7] is the dried product obtained after ... The compressive strength and flexural strength of the phosphogypsum specimens can be determined following the standard Gypsum plasters - Determination of mechanical properties (GB/T 17 669.3–1999). ... the PBG's dry flexural strength and dry compressive strength show a ...

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Strength Prediction of Ball-Milling-Modified …

In this paper, the absolute dry flexural strength and absolute dry compressive strength were two indicators applied to investigate phosphorus building gypsum modified by ball milling, and there were two characteristic …

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Influence of calcination temperature on hydration behavior, strength

Gypsum (CaSO 4 ·2H 2 O) has been an important building material since ancient times and was traditionally used for a wide variety of interior/exterior and structural applications (Fig. 1), including columns, load-bearing walls, arches, vaults, cantilevered staircases, façades, and floors [1], [2], [3].By comparison, todaýs industrially produced gypsum is essentially limited …

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Strength Prediction of Ball-Milling-Modified Phosphorus Building Gypsum

The NSGM (1,4) model established in this paper could effectively simulate and predict the absolute dry flexural strength and the absolute dry compressive strength of the ball-milling-modified phosphorus building gypsum; the average relative simulation errors were 12.38% and 13.77%, and the average relative prediction errors were 6.30% and 12.47%.

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Changes in the Strength Properties and Phase Transition of Gypsum

The paper presents an assessment of the impact of using additives on the strength of a binding material, i.e., building gypsum, and also the phase transformation that takes place in it. Microspheres, aerogel and polymer (HEMC) additives were added to a building gypsum slurry with a water to gypsum ratio of 0.75.

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Study on Effect of Nano-CaCO3 on Properties of Phosphorus Building Gypsum

The absolute dry compressive strength and absolute dry flexural strength of specimens were tested in accordance with the Chinese national standard "Determination of Mechanical Properties of Building Plaster" (GB/T 17669.3-1999) .

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Preparation and Pore Structure of Energy-Storage Phosphorus Building Gypsum

Following the specifications stated in the 'Determination of Mechanical Properties of Building Gypsum' (GB/T17669.3-1999), part of the phosphorous building gypsum slurry was poured into a 40 × 40 × 160 mm triple die to test its compressive strength. ... showing the degree of influence that the two factors have on the absolute dry ...

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Effect of Mineral Admixtures on Physical, Mechanical, and

Desulfurization building gypsum underwent production at 170–190 °C, followed by aging before use. The performance characteristics of desulfurization building gypsum are detailed in Table 1 and Figure 1. As shown in the figure, the main mineral phases of desulfurization building gypsum are hemihydrate gypsum and a small amount of anhydrous ...

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Strength Prediction of Ball-Milling-Modified Phosphorus …

dry compressive strength of phosphorus building gypsum were compared under different mass ratios of material to ball, ball-milling speed, and ball-milling time, and the NSGM (1,4) model …

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Effect of Ball Milling Time on the Performance of …

strength at 2h and strength at dry condition of building gypsum. e results showed that the best performance of building gypsum was obtained when the ball milling time

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Research on the Properties of High-strength Gypsum Based …

prepared with β- gypsum. With reference to this standard, the immersion tensile bond strength of α-gypsum based ceramic tile adhesives is 0.40 MPa to 0.55 MPa, which

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Deterioration Reason and Improvement Measure of the

tive called gypsum retarder is usually used to prolong the setting time of building gypsum, maintain the plas-ticity of building gypsum for a longer period of time to improve the construction performance[7,8]. Unfortunate-ly, the retarder is negative to the mechanical strength of hardened gypsum. Moreover, the type and addition

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Determination of equilibrium moisture content of building …

The EMC of a building material thus spans from an absolute dry state of zero moisture content to its vacuum saturation moisture content, as the partial pressure of water vapor varies from zero to full saturation value for a given temperature. But the path that connects these two extremes is often not unique. This is due to a phenomenon called

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Determination of Young's Modulus of Gypsum Blocks Using …

The dynamic Young's modulus determination of the first six gypsum blocks were done twice, at first on 2nd February 2009 (the first two were tested on 23rd January 2009) and then on 27th April 2009. In time between these two dates, the gypsum blocks were put out of the laboratory building. They were exposed to weather

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Effects of different ball-milling parameters on the …

Under water consumption for standard consistency, the effects of the mass ratio of material to ball, milling speed, and milling time on the absolute dry flexural strength of phosphorus building ...

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Preparation and Performance Study of Light Weight Gypsum …

cementitious materials with desulfurization building gypsum as the main component. Liang Hongchao et al. prepared gypsum-based thermal insulation materials with compressive strength of 0.7MPa and dry density of 350kg/m3 using VM as lightweight aggregate [2]. Zhang Dajiang et al. ... determination of EP and VM, the average particle size D(50) of ...

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Changes in the Strength Properties and Phase Transition of Gypsum

The paper presents an assessment of the impact of using additives on the strength of a binding material, i.e., building gypsum, and also the phase transformation that takes place in it. Microspheres, aerogel and polymer (HEMC) additives were added to a building gypsum slurry with a water to gypsum ratio of 0.75. In order to investigate their influence on bending strength, …

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Effect of ball milling on absolute dry flexural strength …

As can be seen from Figure 1, under different mass ratios of material to ball and milling speed, the absolute dry flexural strength of phosphorus building gypsum first increased and then decreased ...

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Strength Prediction of Ball-Milling-Modified Phosphorus Building …

According to the research results, under the same mass ratio of material to ball and ball-milling speed, the absolute dry flexural strength and absolute dry compressive …

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Deterioration Reason and Improvement Measure of the

Effects of Several Retarders on Setting Time and Strength of Building Gypsum[J]. Construction and Building Materials, 2020, 240: 117–927. Article ... but little effect on the absolute dry flexural strength was observed. The retarding effect of protein retarder on phosphorus building gypsum (PBG) and desulfurization building gypsum (DBG) was ...

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