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On Fig. 12, showing the effect of freezing-thawing cycles, the thermal conductivity remained unchanged between the non-aged state and after the aging treatment. There was no effect of freezing-thawing aging on the thermal performance, either for …
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To reveal the mechanism of the high chloride-binding capacity for high ferrite Portland cement, ferrite phase (C4AF) was prepared and the effects of different gypsum dosages (0%, 5%, 10%, 20%, 30% ...
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The presence of residual C 3 A can be further associated with its higher content in the original mixtures of the M1010 series, but also with the overdosed gypsum content used, which has been found ...
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To this end, the effect of aging on micro-mechanics, chemical functional groups, and rheological properties of bitumen were evaluated by atomic force microscope, Fourier transform infrared spectroscopy and dynamic shear rheometer tests, respectively. ... The typical "bee" structure and the three-phase features (Bee phase, Periphase, and ...
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In clinker–gypsum system, these results show that the gypsum significantly improves the hydration kinetics of alite–belite–ferrite phase system at the first 7 days. …
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The gypsum plaster is used because of his thermal properties and ease of manufacture. Only the optimized mixture was used to perform the accelerated aging tests. ... Early on in the development phase of laboratory material, the choice of the basic components of the composite is often based on the literature and on economic considerations ...
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This study suggests that regulator SDS can facilely tune the crystal phase and morphology of gypsum products from FGD gypsum source materials in solution phase with low energy cost, and our work provides an alternative way for efficient conversion of FGD gypsum, thus showing great promise for a wide range of challenging reuse of solid waste in ...
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building gypsum can be divided into three stages. Gypsum releases the heat of solution in the first stage when it comes into contact with water; the hydration heat began to increase slowly in …
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The effects of aging time, aging temperature, MBA addition and pH on the morphology of the synthesized CSD after hydration are investigated. 3.1.1 The effect of aging time on the synthesized crystals Figs.2(b-e) show SEM images of the synthesized crystals for different aging time under 3 g of MBA, 4 of pH, and 80 ℃ of aging temperature. With the
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The effect of gypsum on the hydration of C 3 S is widely studied by Menetrier et al., [7]. It has been demonstrated that the dissolution rate of C 3 S increased in the presence of gypsum. Kurdowski [8], reported that the gypsum accelerates the C 3 S hydration mainly in the pre-induction period, its effect on cement hydration takes two aspects ...
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3 ð9Þ The effect of gypsum on the hydration of C 3S is widely studied by Menetrier et al., [7]. It has been demonstrated that the dissolu-tion rate of C 3S increased in the presence of gypsum. Kurdowski [8], reported that the gypsum accelerates the C 3S hydration mainly in the pre-induction period, its effect on cement hydration takes two ...
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Figure 8 b illustrates the main phases—CaSO 4 ·2H 2 O, C–S–H gel, AFt, RO phase, and Ca 3 SiO 5 —for the 28-day GSLM with SS. RO phase and Ca 3 SiO 5 were present in the raw materials of SS [42,43,44,45]. The diffraction intensity of RO phase and Ca 3 SiO 5 increased gradually with rising SS content, while the AFt content slightly ...
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To reduce energy consumption, enhancing the insulation performance of gypsum interiors is crucial. Meanwhile understanding the damage mechanisms of severe weather on building …
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This work presents thermomechanical experiments whose results have led to a new formulation of composite panels for building construction. This panel has the advantage to be lightweight and 2 h firebreak. Plaster, under the β-hemihydrate form, is used as a matrix and mineral products (vermiculite, mica, glass fibers) are added as lightweight additives, …
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Semantic Scholar extracted view of "The aging of gypsum in underground mines" by C. Auvray et al. ... In the present work, an attempt has been achieved to describe the effects of ageing and of water on the hydro-mechanical behaviour of chalks from underground quarries of northern Parisian basin. … Expand. 1.
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The phase evolution and the total porosity were followed and compared to thermodynamic simulation to understand the reactions involved and the effect of limestone on these binders.
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The field experiments were conducted for three consecutive years from 2011 to 2014 to evaluate the influence of graded levels of gypsum as a source of sulfur and different times of application on ...
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Abstract. The effects of phosphoric acid (H 3 PO 4) in pressurized aqueous solution on the dehydration of CaSO 4 ·2H 2 O to form α-hemihydrate gypsum (α-HH) phase and the regulation of crystal shape were studied in this paper in order to provide guidance for the low-cost and high-value utilization of phosphogypsum. The results showed that H 3 PO 4 can significantly …
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The results indicate that the presence of cement as an additive could eliminate the weak points of construction gypsum without any negative side effect. The study was supported by aging ...
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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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Gypsum plaster is one of the most commonly used construction materials. It has been frequently used in the construction of historical buildings, temples and monuments since ancient times [1].Today, the use of gypsum as a building material is on the rise [2, 3].The main reasons for this are that gypsum plaster is cheap, energy-saving, healthy, environmental …
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The Al2(SO4)3 addition also has a quick-setting effect on gypsum plaster during the hydration process, meanwhile inhibiting the growth of the (020) crystal plane of dihydrate gypsum (DH), then ...
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phase composition of gypsum (dihydrate) with the aim of producing a partially dehydrated gypsum binder similar to incompletely fired binders [12]. EXPERIMENTAL We used natural gypsum from the Baskunchak deposit (Astrakhan oblast). To reduce the effect of impurities, we selected the purest CaSO 4 · 2H 2 O samples (98.3+% purity).
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In this work, the effect of curing temperature on the hydration of calcium sulphoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS) …
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This work investigated the effect of gypsum on the early-ages hydration progress of MOC systems by isothermal calorimetry and BNG model. The following conclusions can be …
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Abstract: The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD)gypsum is a good way to realize the comprehensive utilization of FGD gypsum.To obtain α-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD gypsum was ...
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to be the preferred hydration phase with significant strength gain due to its good lling and interconnection properties. However, in a humid environment, 5-phase and 3-phase are easily decomposed into Mg(OH) 2, and unreacted MgO will also be converted into Mg(OH) 2, which will cause cracking and performance degradation of sample [10, 12]. To ...
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Flue gas desulfurization (FGD) gypsum is an inevitable industrial solid waste originated from the process of calcium-based wet flue gas desulfurization in thermal power plants and some chemical plants in order to reduce the emission of SO 2 pollution gas [1], [2].In China, the total product of FGD gypsum has reached 550 million tons by 2016 [4], and the FGD …
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Effect of AlCl 3 concentrations and equilibrium time on the phase and XRD patterns of FGD gypsum in the reaction. Violet and orange lines (at bottom) indicate expected reflections for the CaSO 4 ...
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The application of α-hemihydrate gypsum (α-HH) is limited by several factors, such as a rapid hydration rate, short setting time, poor water resistance, and high cost.
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