Role of Gypsum in Cement and its Effects
The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water. The process involved in hydration of …
Positive and negative impacts of flue gas desulfurization (FGD) gypsum …
Flue gas desulfurization (FGD) gypsum, a by-product of carbon-based energy sources, has typically been incorporated as a component of concrete mixes and wallboard and beneficially used as an agricultural amendment to enhance terrestrial crop production and improve the quality of runoff.
Utilizations of preheated flue gas desulfurization gypsum
Current study proposes an effective way to modify the properties of super-sulfated cement (SSC) paste and mortar with preheated flue gas desulfurization (FDG) gypsum at different temperatures and durations, and different sulfate compositions.
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 industrial production, formula (1) is commonly used to determine the mass fraction of industrial gypsum, in which SAC with different properties has different gypsum coefficients.
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 …
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 …
Partial Cement Replacement in Concrete with Gypsum …
On the other hand, although the whole gypsum concrete is slightly weaker than fine gypsum concrete, the former is much more sustainable compared to the latter. Table 4 shows the comparison between whole gypsum, fine gypsum concrete, and control specimen in terms of compressive strength changes as a result of using gypsum …
New insights into the effect of gypsum on hydration and …
The influence of gypsum on hydration and microstructure of fresh C 3 S paste during setting were studied with isothermal calorimetry, 1 H nuclear magnetic resonance ( 1H NMR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and …
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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).
Modified gypsum-cement-pozzolanic composites …
The purpose of this research is to study the effect of methods of preliminary preparation of thermally activated clay, which is a pozzolanic component in water-resistant composite gypsum binders ...
Understanding the effect of alkali content on hydration, …
Understanding the impact of alkali content in Portland cement on cement hydration is crucial for optimizing cement quality from the source and enhancing cement performance. This paper systematically elucidates the sources and content of alkalis in cement, as well as the effects of alkalis on hydration properties, strength, and durability.
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 …
Full article: An overview of alternative raw materials used in cement …
They compared the setting and mechanical properties of phospho-gypsum cement that were prepared in different ratios with Portland cement containing natural gypsum and found that the highest 28-day compressive strength is associated with 3% phosphor-gypsum cement.
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.
(PDF) Effect of Nano-gypsum on Mechanical Properties Cement …
This study investigates the effect on the mechanical properties of cement-stabilised silty soft soil (CSS) using nano-gypsum (NG). Unconfined compression strength (UCS) test trials were conducted ...
Analysis of anhydrite gypsum effects on quality of cement
In this report, quality parameters gypsum and anhydrite cement samples are also investigated. With respect to learn effects of gypsum and anhydrite on cement parameters, the physical and mechanical parameters of cement samples which is mixture of clinker-gypsum and clinker-anhydrite with 4.0, 4.5, 5.0, 5.5 and 6.0% are …
Why Gypsum Is Added To Cement? Roles And Uses Of Gypsum …
What is Gypsum? Gypsum is a mineral and is hydrated calcium sulfate and chemical form. Gypsum is also known as retarding agent in cement because its main function in cement is to control the initial and final setting time of the cement.
PERFORMANCE CRITERIA FOR THE USE OF FGD GYPSUM IN CEMENT AND CONCRETE …
FGD gypsum is evaluated as a possible partial or total substitute of natural gypsum for the control of cement setting. Extended laboratory and industrial scale trials in cement and concrete mixes were carried out.
The role of gypsum in cement
One of the main quality issues faced by cement plants using the chemical gypsum was the presence of contamination with azo dyes in the gypsum which resulted in market …
Properties of Cement that effect Quality
Chemical analysis of cement raw materials provides information about the chemical properties of cement. Tricalcium aluminate (C3A) The low content of C3A makes the cement resistant to sulfates. Gypsum …
(PDF) Effect of Gypsum Amount in Cement on …
The twenty eighth day compressive strength of SCC mixes with 5%, 10%, and 15% replacement showed a reduced strength having 72.18%, 58.12% and 60.56% of the control, 0% replacement, with a …
Effect of phosphorus impurities on sulfoaluminate cement …
The preparation of gypsum-based self-leveling mortar (GSLM) from solid waste-derived sulfoaluminate cement-modified hemihydrate gypsum is an effective path to enhance its mechanical properties. However, the phosphorus impurities in phosphogypsum (PG) still pose a challenge to the hemihydrate gypsum & sulfoaluminate cement composite system.
Analysis of anhydrite's effects on quality of cement
Gypsum plays a crucial role in cement. Though it is used in a small quantity, in the range of 2.5-3.0 percent in terms of SO3, gypsum's role in cement is significant, more predominantly at early ages.
(PDF) Role of Gypsum in Cement | shreesh khadilkar
Having appropriate performance tests on the receipt chemical gypsum would help the cement plants to overcome the cement quality issues in use of chemical gypsum and would result in usage of higher percentage of the chemical gypsum.
Construction Materials | Free Full-Text | Effects of Gypsum …
Usage of industrial by-products such as ground granulated blast furnace slag (GGBFS), gypsum, and limestone powder have gained prominence in concrete production. It is, therefore, very important to conduct research into the various materials and their attendant influence on properties of concrete at different ambient temperatures. …
Gypsum Concrete
There are also applied mathematical and computer methods for modelling the gypsum's internal structure formation and for subsequent regulation of the properties to produce …
Application of the Industrial Byproduct Gypsum in Building …
After a series of physical and chemical effects, building materials can change from slurry to solid stone. ... PG has the ability to replace natural gypsum as a cement retarder ... and stability of the grass-roots layer ensure the good quality of the surface structure. At present, all kinds of gypsum in road base materials have been …
Gypsum as set retarder in Cement
Effect of gypsum on cement by preparing four different batches of Ordinary Portland Cement (OPC) using same quality clinker, maintaing SO3 level of cement 2 +/- 0.05 % and maintaining Blaine value ...
Effect of Chemical Admixtures on Setting Time, Fluidity …
Effect of Chemical Admixtures on Setting Time, Fluidity and Mechanical ... expansion can cancel out the shrinkage effect that introduced by cement constituent to avoid crack formation. In addition, GSL ... is much less than that of natural gypsum while the quality of FGD is comparable to that of natural gypsum (Cao et al., 2015). Phosphorus
An Insight into the Chemistry of Cement—A Review
Even if cement is a well-consolidated material, the chemistry of cement (and the chemistry inside cement) remains very complex and still non-obvious. What is sure is that the hydration mechanism plays a pivotal role in the development of cements with specific final chemical compositions, mechanical properties, and porosities. This …
Evaluation of engineering properties and environmental effect …
As cement + gypsum and cement + gypsum dosage increase, the formed AFt and some chemical products increases, and the amount of AFt in lime + gypsum stabilized soil is larger than that of cement + gypsum stabilized soil (see Fig. 50) (Ahmed, 2015). However, For the FA + gypsum + lime stabilized soil, the formed cementitious …
Production and use of by-product gypsum in the construction industry
This chapter focuses on the production and the use of by-product gypsum in the construction industry. There are two groups of gypsum by-products that have been identified: chemical gypsum and desulphogypsum.
Construction Materials | Free Full-Text | Effects of …
The results of the tests indicated that both gypsum and limestone powder when added to a mix proportion containing GGBFS can improve slump and compressive strength of concrete. Anhydrous …