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Strength Behavior of Sedimented Gypsum Slurry
Abstract. Rapid increases in the production of gypsum waste from the Flue Gas Desulphurization process necessitates that proper impoundments be built with an adequate understanding of the strength behavior of the sedimented gypsum slurry. This article presents laboratory experimental results that describe its physical characteristics and strength behavior. …
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Study on Effect of Nano-CaCO3 on Properties of Phosphorus Building Gypsum
When the content was 1%, the strengthening effect reached 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 blank group; when the content was 1.5%, the water absorption was 0.22, which was 33% lower ...
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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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High value-added utilization of desulfurized building gypsum …
GSL. Traditionally, β -hemihydrate gypsum is commonly blended with cement, α -hemihydrate gypsum or anhydrite to improve its strength (Ma et al. 2018; Jin et al. 2020). Peng et al. (Peng et al. 2012) suggested that 24-hour absolute dry exure and …
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A novel method for preparing phosphorus building gypsum (PBG …
It is necessary to consider the dual problems of poor performance and low production efficiency that stem from the highly utilised water/gypsum ratios in the traditional preparation of phosphorus building gypsum (PBG)-based building materials. These problems cannot be easily overcome because that PBG tends to agglomerate at low water/gypsum …
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Strength Prediction of Ball-Milling-Modified …
In this paper, the absolute dry flexural strength and the absolute dry compressive strength of phosphorus building gypsum were compared under different mass ratios of material to...
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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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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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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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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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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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Effect of Organic Admixtures on the Water Resistance of …
In this experiment, the strength, water absorption and softening coefficient of gypsum test blocks were measured under different admixture conditions using desulphurised building gypsum with …
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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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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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Research on the Performance of Phosphorus Building Gypsum
16.3.1 Effect of Physical Properties of Phosphorus Building Gypsum-Based Lightweight Concrete Materials. Setting Time and Standard Consistency.The gypsum-based material setting time and standard consistency water consumption is an important indicator in measuring the physical properties of the material inspection, which not only affects 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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Compressive Strength and Durability of FGD Gypsum-Based …
2.1. Materials. FGD gypsum, S95-GGBS, and S105-GGBS were provided by Shanghai Baotian New Building Materials Co., Ltd (Shanghai, China). The chemical compositions of these raw materials were listed in Table 1.The physical state of the FGD gypsum was a powder-like condition in a dark brown color, and had 15.6 wt.% free water, which was dried in …
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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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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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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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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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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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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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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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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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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 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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(PDF) A novel method for preparing phosphorus building gypsum …
One important way to recycle phosphogypsum is by preparing phosphorus building gypsum, but its use is limited due to inferior properties compared with cement or natural building gypsum [7, 8 ...
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The prediction results of absolute dry compressive strength.
Download scientific diagram | The prediction results of absolute dry compressive strength. from publication: Strength Prediction of Ball-Milling-Modified Phosphorus Building Gypsum Based on NSGM ...
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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.
WhatsApp: +86 18221755073