phase can variably be altered which consequently affects the rheokinetics of the cement paste. Currently, the effect of the available amount of hemihydrate and natural gypsum in the cement sulphate phase, on both the hydration and rheology of ordinary Portland cements (OPC), are not well-understood.
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In this study, the impact of four accelerators, namely sodium sulfate (Na2SO4), calcium nitrite (Ca (NO2)2), triethanolamine (TEA), and diethanolisopropanolamine (DEIPA), on the hydration and...
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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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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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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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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 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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The performance of composite gypsum at elevated temperatures depends on the treatment temperature and reflects the combined effects of gypsum phase change and the filler effects of silica flour or talc powder. …
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Freezing-thawing and wetting-drying accelerated aging tests are considered to simulate outdoor conditions. Two straw-gypsum plaster composites were designed. Long-term durability under …
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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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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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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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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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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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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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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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The phase changes of gypsum were considered to be sufficiently understood for a long time. 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 detailed research associated with it, gaps in the current knowledge have been discovered. This paper …
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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. ... The gypsum plaster used is a quick-setting ... the effect of accelerated aging on the thermal and mechanical properties of two plaster and cereal straw composites was ...
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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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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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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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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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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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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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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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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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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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The largest increase occurs in 3 days of aging at the relative humidity of 80%. The studied thermodynamic analysis of the process has showed that the most significant change of …
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As the aging time increases, the size and area fraction of the μ phase initially increase, stabilizing after 2000 h of aging. Specifically, the μ phase maintains stable dimensions, with a length, width, and area fraction of approximately 1.35 μm, 0.55 μm, and 2.85 %, respectively.
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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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