Effects of microencapsulated phase change materials on the …

Microencapsulated phase change materials (MePCMs) were fabricated via sol–gel synthesis, with nano-SiO 2 acting as shell, lauric acid (LA) and myristic acid (MA) binary eutectic mixture as core materials, and then MePCMs were incorporated in gypsum. The thermal performances of LA-MA@nano-SiO 2 MePCM as well as MePCM based gypsum board were …

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Optimization of the SO3 content of an Algerian Portland cement: …

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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Effect of wetting-drying cycles on gypsum plasters containing …

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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Fate of Adsorbed Arsenate during Phase Transformation of Ferrihydrite

Gypsum retains Cu via structural fixation, surface adsorption, and surface coprecipitation. ... The effect of aging in As-mobility in two dip-site soil types, ferralitic and sandy soils, are ...

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Effect of Mechanical Activation Procedure on the Phase

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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Effect of ratio of desulfurization gypsum to carbide slag on low …

Results show that the mixture of desulfurization gypsum and carbide slag as skeleton material is feasible and reliable and an optimal mass ratio of desulfurization gypsum to carbide slag was obtained to be 3.5 to 1.5; the phase-change composite with the optimal mass ratio possesses good mechanical strength of up to 134.116 MPa and an energy ...

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Effect of Phosphoric Acid on the Preparation of α-Hemihydrate Gypsum

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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Preparation of α-hemihydrate gypsum from phosphogypsum in …

The industrial application of PG is mainly focused on building gypsum (β-CaSO 4 ·0.5H 2 O) [5], α-hemihydrate gypsum (α-CaSO 4 ·0.5H 2 O, α-HH) [6], [7], cement retarder [8], sulfuric acid co-production cement [9], soil conditioner [10] and so on. Among which, the preparation of α-HH using PG is one of the most profitable approaches because α-HH is a …

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The Effect of Multistage Aging on Mechanical Properties and

A new four-stage aging treatment, which is composed of pre-aging, retrogression, natural aging (NA) and re-aging, is designed to increase the tensile properties and the fatigue life of forged 7050 aluminum alloy in this work. As compared to traditional T74 and RRA treatments, the four-stage aging-treated sample exhibits the highest tensile properties and ductility. The …

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Analysis of aging effects on the mechanical and vibration …

Composite materials have become a cornerstone of modern engineering and manufacturing, offering unparalleled advantages over traditional materials like metals and ceramics 1,2.Fiber reinforced ...

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New insight into the phase changes of gypsum

However, due to the increasing importance of gypsum recalcination (connected with the planned closure of thermal power plants resulting in a lack of FGD gypsum) and new …

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Effect of gypsum on low-heat Portland cement early mechanical

Alkanolamines are commonly used complexing agents in the cement industry. Due to its surface activation effect on cement clinker particles, it is commonly used as cement grinding aids [44], [45].When used as chemical admixtures, it can accelerate the early hydration process of cement by complexing with metal ions [46], [47].Among them, triisopropanolamine (TIPA), …

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Preparation of eco-friendly functional lightweight gypsum: Effect of

To achieve the process of making lightweight gypsum, three kinds of LWAs were selected in this paper, including pottery sand, expanded perlite and EPS particles. ... Therefore, the introduction of the gas phase under the effect of LWAs is the reason for the enhancement of sound absorption capacity. For B0-B8, it has excellent sound absorption ...

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Effect of gypsum on hydration properties, composition and …

Q phase is a high-alumina mineral phase belonging to the CaO-MgO-Al 2 O 3-SiO 2 quaternary system. Its chemical composition is represented by Ca 20 Al 32-2n Mg n Si n O 68, (2.5 ≤ n ≤ 3.5) [45].Q phase exhibits a low firing temperature about 1300 °C [46], and its calcium content is 33 % lower than C 3 S, indicating a reduced carbon footprint [47]. ...

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Effect of aging on micromechanical behavior of asphalt surfaces …

Asphalt pavements are unavoidably vulnerable to aging during construction and use because of the coupling of temperature, humidity, and ultraviolet (UV) light cycles in the road area [1].After aging, the chemical makeup and molecular structure of asphalt changes, leading to detrimental impacts on the macro properties and long-term performance of asphalt pavements …

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New insights into the effects of aging on Portland cement …

Beyond 3 days of exposure the ettringite signal decreased, signifying carbonation and decomposition of this phase into calcite, aluminum hydroxide and gypsum as we have …

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Effect of gypsum content in cement on its adaptability to alkali …

The effects of three different curing temperatures (0°C, 20°C and 40°C) on cement setting times and performance were thus examined. ... both the CH and amorphous phase contents increased and then decreased with an increase in gypsum content. The amorphous phase content in OPC_97 + 3 was the highest among all the samples after curing at these ...

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Preparation of α-High Strength Gypsum from Flue Gas …

The effects of salt solution recycling on the transition of α-HH from FGD gypsum were investigated by a comparison with that in laboratory scale, focusing on the dehydration rate of FGD gypsum ...

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Effects of various gypsum on early-age hydration behavior of …

Incorporation of natural gypsum (NG) to MOCP reduces its nucleation rate and growth rate, while an appropriate amount of flue gas desulfurization gypsum can provide …

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Preparation of α-High Strength Gypsum from Flue Gas

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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Jets of three-phase power-law fluids and jet mixing in gypsum

Section 2 provides the original experimental data on the material rheology. Section 3 describes the problem formulation for jets of the three-phase power-law fluids. Section 4 describes the invariant-based coordinate transformation used to develop the novel numerical method proposed in this work. Section 5 discusses the results for straight jets issued into the …

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Effects of thermal aging on the blend phase morphology and …

To explore the effect of thermal aging on the phase morphology of the PI/UHMWPE blends, the intensity ratio (I 1601 /I 2885) of the peaks at 1601 cm −1 (characteristic peak of PI, indicating the benzene skeleton vibration) and 2885 cm −1 (characteristic peak of UHMWPE, indicating the –CH 2 - asymmetrical stretching vibration) was ...

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Numerical investigation of gypsum board calcination under …

As gypsum boards are widely used in building construction, fires leave fire patterns on the gypsum board. Currently, fire investigators identify fire patterns by visible observation or through depth measurements of materials affected by the fire [1].This analysis demands the coupling of the physical laws of fire dynamics with the investigator's inference regarding the …

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Gypsum as a Construction Material-A Review of Recent …

Effect of Fineness of Gypsum Powder: The fine gypsum powder exhibits a greater expansion than a coarse material at a constant water-gypsum ratio. Effect of Water-gypsum ratio: Usually expansion reduces with increase in the water-gypsum ratio since the increase in the water-gypsum ratio creates more distance between the particles which will ...

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Fire performance of gypsum-sheathed cold-formed steel walls …

Aging had a negligible effect on the insulation performance of LBR-FGP boards, while it enhanced the insulation performance of LBR-GP boards. The improvement was attributed to stress relief between gypsum crystals during dehydration and recrystallization, resulting in reduced cracking and improved insulation.

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Compressive strength of plaster composites with aging time. The

Houses, especially in the U.S.A. and Europe, are either built from or lined with gypsum-based products favored by architects because of their superior properties, such as obtainable availability ...

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Effect of Curing Temperature on the Hydration of Calcium …

Gao, D., Z. Zhang, Y. Meng, J. Tang, and L. Yang. 2021. "Effect of flue gas desulfurization gypsum on the properties of calcium sulfoaluminate cement blended with ground granulated blast furnace slag." ... and J. Ji. 2018. "3 phase in the hydration product system of AFt-AFm-AH 3 ... Lizhe Liang, Effect of Three-Dimensional Porous ...

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Improvement of the Hydration Kinetics of High Ferrite

Request PDF | On Nov 4, 2021, Kechang Zhang and others published Improvement of the Hydration Kinetics of High Ferrite Cement: Synergic Effect of Gypsum and C 3 S–C 4 AF Systems | Find, read and ...

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The effect of low temperature aging on the mechanical property & phase

Although low temperature aging caused the tetragonal-to-monoclinic phase transformation related to temperature, the minimum flexural strength was above 700 MPa. CONCLUSION. The monoclinic phase started to appear after aging treatment above 100℃. With the higher aging temperature, the fraction of monoclinic phase increased.

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Investigation of the impurity effect on the kinetics of thermal

In this work, samples of natural gypsum from various locations of various chemical and phase compositions were studied, and the effect of a controlled amount of added crystalline modifier on the thermal properties of pure gypsum was investigated.The results of this study do not only expand knowledge about the basic mechanisms in natural gypsum ...

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