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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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The compressive strength and flexural strength were assessed under the international standard 'Gypsum plasters—Determination of Mechanical Properties' (ISO 3051:1974). It would be advisable to store the specimens, which have a size of 40 mm × 40 mm × 160 mm, in a closed climate chamber immediately after demolding.
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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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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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Two groups of the same gypsum samples were prepared. some of them were used for the dry strength (f 1), and the others were soaked in water for the wet strength at 20 ± 2 °C for 24 h (f 2). What' more, the absolute dry mass (m 1) was measured before the absolute dry strength was tested. Thus, the softening coefficient was defined as the ...
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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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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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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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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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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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The fired gypsum is used as a dry, powdered product, for example, as a binder in plaster or screed. Before processing, these dry products are mixed again with water. Gypsum, plaster and gypsum screed, and gypsum plasterboard consist essentially of …
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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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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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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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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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unconfined compressive strength test results were found in the gypsum content of 0% and curing for 0 days of 3.8667 kg / cm2. While, the largest found in the gypsum content of 8% with 28 days of 14.2 kg / cm2. Curing increases the strength of soil. The addition of gypsum is effective for stabilization of clay soil. Keywords
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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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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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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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Lewry and Williamson [9] reported that the gypsum strength develops during setting via a three-stage process: first a development of an interlocking matrix of dihydrate needles, then a relief …
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