Effect Of Gypsum Content On Cement
Effects of various gypsum on early-age hydration behavior …
Gypsum modification is an effective strategy to improve the water resistance of magnesium oxychloride cement paste (MOCP), but its early-ages performance evolution has not received much attention. The exothermic characteristics and hydration kinetic parameters of MOCP with different contents and types of gypsum are investigated. The results show that the …
Effect of gypsum on hydration properties, composition and …
The effect of water and gypsum content on strätlingite formation in calcium sulfoaluminate-belite cement pastes Constr. Build. Mater., 166 ( 2018 ), pp. 712 - 722, 10.1016/j.conbuildmat.2018.01.153
Effects of different gypsum varieties on the hydration and …
The property of the gypsum and its possible effect on the cement were the key considerations when choosing the quantities of gypsum. ... In order to observe the changes of hydration products of cement under the influence of gypsum, the content of anhydrite was designed to be 5 wt%, 10 wt% and 15 wt%, respectively. ...
A quantitative study of the C3A hydration
The effect of fineness, gypsum content and water – cement (w/c) ratio on the hydration of C 3 A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, 27 Al MAS NMR) and numerical modelling. It is proposed that the retardation of C 3 A in the presence of calcium sulphates …
Effects of sulfates on the hydration of Portland cement – A …
Presented within is a critical overview of the effect of sulfates on cement hydration, properties, and optimum sulfate content in Portland cement. ... [151], the gypsum content needed for the maximum volume of aluminate phases increases with time, which could explain the higher optimum sulfate content at later ages. Further studies regarding ...
Uses of Gypsum in Cement
Gypsum in cement reduces friction between its particles, thus resulting in a mix with higher smoothness and improved workability. Durability. Gypsum increases the durability of cement structures or elements by providing improved resistance to chemical attacks by sulfates and alkali-silicates. Effects of Gypsum in the cement
(PDF) Effect of gypsum and cement content on unconfined …
Considering Portland cement to be $90/ton and gypsum to be $30/ton (Kimball and Jewell 2016), a one cubic meter of mixture with the density of 1.4 (gr/cm3) with 8% Portland cement (112 kg, or of the total binder content) would cost $10.08, while a mixture of 2% gypsum (28 kg, or 25% of the total binder content) and 6% Portland cement (84 ...
Effect of gypsum content in sprayed cementitious matrices: Early age
To mitigate such effect, the construction industry developed new formulations of alkali-free accelerators, which contain sulfate ions in their composition to balance the C 3 A/SO 3 ratio. However, mixes with these accelerators may still behave as undersulfated [3, 6, 10] so that extra doses of sulfate are required to control C 3 A and C 4 AF hydration.A proper addition of …
The effect of water and gypsum content on strätlingite …
The effects of the w/c and gypsum content on the hydration of CSAB cement and the formation of strätlingite were investigated with a series of experiments including mechanical testing, quantitative X-ray diffraction (XRD, QXRD), isothermal calorimetry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM).
Effect of gypsum content on the carbonation of …
The carbonation behavior of sulfoaluminate cement (SAC) with different contents (0%, 5%, 10%, 15%, and 20%, by mass) of gypsum was investigated via th…
Effects of C3A and C3S with gypsums on the hydration of oil well cement
Gypsums shorten cement setting and thickening times opposite to the commonly known retardation effect due to the lower content of C3A and its acceleration on C3S hydration. Dihydrate and hemihydrate gypsums show a greater promotion effect on strength at 30 and 50 °C, while anhydrous gypsum presents a greater enhancing effect at 80 °C ...
Effect of Gypsum Content in Cement on Autogenous …
Title: Effect of Gypsum Content in Cement on Autogenous Shrinkage of Portland Blast-Furnace Slag Cement Concrete Author(s): H. Tsuruta, H. Matsushita, K. Harada, and T. Goto Publication: Symposium Paper Volume: 221 Issue: Appears on pages(s): 683-702 Keywords: autogenous shrinkage strain; degree of slag hydration; gypsum content; thermal …
Effect of gypsum content on the carbonation of …
This study makes a good understanding to the effect of gypsum content on the carbonation behavior of SAC. Section snippets Raw materials and sample preparation. The …
Effect of Gypsum Content on the Compressive Strength of LC3 Cement
LC3 cement is a type of cement that uses high additions contents, counting on the synergistic reaction between calcined clay and limestone to obtain mechanical strengths similar to those of traditional cements. This research intends to investigate the influence of the gypsum content on the compressive strength of a LC3 cement.
Study of Hydration of Belite-Based Cement with High Gypsum Content
An interesting effect of initial Gypsum content on the Pseudo Formula Mass of CSH calibrated using the internal standard for PONKS analysis has been observed as can be seen in Fig. 10. The Pseudo Formula Mass of CSH steadily increases with the increase of initial Gypsum content starting from 6% and almost linearly up to 30%.
8 FACTORS AFFECTING SETTING & HARDENING OF CEMENT
The retardation mechanism of gypsum is: when cement is hydrated, gypsum reacts with C3A quickly to generate calcium sulfoaluminate hydrate which deposits and forms a protection film on the cement particles to hinder the hydration of C3A and delay the setting time of cement. If the content of gypsum is too little, the retardation affect will be ...
Effect of gypsum and cement content on unconfined …
ABSTRACT This study investigates the impact of gypsum and Portland cement as binding agents on the stabilization of soft sediment. Eight combinations of gypsum and Portland cement were studied to identify the optimum gypsum content for a total binder content of 8% (by wet weight of sediment). Samples were cured for 7 and 28 days at high and low temperatures …
Effect of Gypsum-Hemihydrate Ratio in Cement on …
For the most reactive type of cement with a high content of both C3A and alkalies, a reduced gypsum-hemihydrate ratio from 80/20 to 20/80 reduced the yield stress, while the plastic viscosity was not much affected. ... For a less reactive type of cement, the effect of the gypsum-hemihydrate ratio was not so pronounced, but for the lowest ratio ...
The effect of water and gypsum content on strätlingite …
Request PDF | The effect of water and gypsum content on strätlingite formation in calcium sulfoaluminate-belite cement pastes | The main objective of this study was to investigate the phase and ...
Study on the effect of gypsum content in cement on the …
The results showed that an increase in the gypsum content of cement promoted the formation of ettringite (AFt) and decreased the setting times of cement pastes at 0°C, 20°C …
Effect of gypsum on low-heat Portland cement early …
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), …
Effect of desulfurization gypsum on alternating-current …
Effect of desulfurization gypsum on alternating-current impedance characteristics of all-solid-waste belite sulphoaluminate cement mortar ... with 10 % content is the highest at 28 d, which is 84.6 MPa. In 28d of hydration, with the increase of desulfurized gypsum content, the pore size of mortar decreases, so that the porosity decreases from 3 ...
Gypsum in Cement
Semantic Scholar extracted view of "Gypsum in Cement" by G. Frigione. Semantic Scholar extracted view of "Gypsum in Cement" by G. Frigione. ... Effect of sulphate content of cement upon heat evolution and slump loss of concretes containing high-range water-reducers (superplasticizers) S. M. Khalil M. Ward.
Effect of Portland Cement Blending with Calcium …
The CSAB system with additional gypsum will have ettringite as the major hydration product. The surplus gypsum will promote ettringite formation at the expense of monosulfate, limiting its capacity to bind carbon dioxide. The microstructure of PC system will also be influenced by blending it with CSA admixture or CSAB cement and gypsum.
Effect of gypsum content in cement on its adaptability to …
The setting times and early strength of shotcrete are greatly affected by the gypsum content of the cement used. In this work, the setting times, compressive strength and microscopic analysis (X-ray diffraction quantitative analysis, thermogravimetric analysis and scanning electron microscopy) were used to determine the effects of changes in gypsum content on the …
Effect of gypsum content in cement on its adaptability to …
The results showed that an increase in the gypsum content of the cement promoted the formation of ettringite (AFt) and decreased the setting times of the cement pastes at 0°C, …
Effect of Gypsum Content and other Factors on Shrinkage of Concrete …
The effects of gypsum content of cement and other factors on shrinkage and cracking tendency of concretes are investigated by methods described in a previous paper. An essential feature of the method is that prisms of the concretes are permitted to dry from only one side. It is found that there is in general an optimum gypsum content for each ...
Effect of gypsum content in cement on its adaptability …
in concrete, which severely reduce the durability of the concrete, cause pollution in construction environments and endanger the 440 Cite this article Wang Q, Guo Z, Zeng F, Wang H and Qin H (2024) Effect of gypsum content in cement on its adaptability to alkali-free accelerator at different temperatures. Advances in Cement Research 36(9): 440 ...
Effect of Gypsum Content on Sulfoaluminate Mortars Stability
The effect of gypsum content in CSA [8] [9] [10]and CAC [11] has already been reported, showing that the expansion increases with the gypsum content. Expansion is generally attributed to the ...
Understanding Gypsum's Crucial Role in Cement and Its …
Gypsum-infused cements boast superior strength and hardness compared to their non-gypsum counterparts. Gypsum-based cement requires less water in the hydration process, contributing …