Gypsum in its natural state (gypsum mineral), as recycled and industrial waste (e.g. used or waste plasterboards), or as phosphate industry and thermal power plants by-product (e.g. phosphogypsum, flue gas desulfurization gypsum) has the potential to be used as a cementing/adhesive material instead of cement for ground improvement.
mined-gypsum has been used as cement additive and soil amendments (Hurlbut and Klein, 1971). Another source of gypsum is nongeogenic in nature, such as it is a by-product of phosphoric acid production, which is a part of high analysis prophetic fertiliser production. As compared to the natural gypsum, it is much finer in quality and higher ...
Application of Gypsum in Cement Production:The addition of gypsum to cement changes the properties of cement mortar in a way that... Skip to content. JONOUB-ALAHLI Gypsum Company Since 1982 Until Now; ... chemical gypsum and chemical anhydrite are added to cement as an important additive. On the other hand, in countries like Iran, where …
1. Introduction. The production of cement and concrete is an energy-intensive and carbon-intensive industry [1].Due to modern society's reliance on cement and concrete, the cement industry consumes a staggering annual energy of 1.4×10 10 GJ, approximately 3 % of global energy usage [2].The development of the cement industry has also contributed to the …
Portland composite cement (PCC) is a new variant type of commercial cement that is similar in characteristics with Portland cement in general, but has better quality, is ecofriendly and cheap . The composition of the cement materials includes clinker, gypsum and additive materials such as fly ash and trace or pozzolan [3,4]. Therefore, the ...
Cement plant Require Gypsum as Additive for Making Cement. Gypsum is useful For Regulate Setting Time. J.K.Lakshmi Cement Limited Use Chemical Gypsum as Additive. Chemical Gypsum has Moisture Contain up to 35%. Due to Moisture Contain Handling of Gypsum is difficult.The purpose of this study was to investigate an economical ...
Popp et al. (2021) revealed that mixing gypsum with additives like lime and cement could reduce the leaching of impurities from gypsum in the soil to safe levels through …
Flue gas desulphurisation gypsum (FGDG) mainly refers to the solid by-product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur-containing fuels, such as coal and petroleum [1].In the limestone gypsum flue gas desulphurisation process, 2.7 tons of FGDG can be produced for …
In order to utilize FGD gypsum as a useful admixture in concrete on a large scale, it is necessary to study the adaptability of cement with Compound-slag to concrete plasticizers, …
Alpha gypsum additives make gypsum far stronger and more weather resistant. Forton and Matrix products can be cast solid or make lightweight architectural elements and sculpture castings by reinforcing with glass fiber that are …
Titanium Gypsum (TG) is a kind of industrial solid waste, whose main component is CaSO 4 ·2 H 2 O, produced as the by-product during the production of titanium dioxide [1].For every 1 t of titanium dioxide produced, about 6 t of TG is to be by-produced [2], [3], the production rate of TG is extremely high.The annual output of TG has exceeded 23 million tons [4], but the …
The gypsum core sets and hardens by rehydration of the calcined gypsum, before excess water is removed from the boards in the dryer. A variety of liquid and solid additives are used during gypsum board production. An overview of the most relevant additive types added to the gypsum core is provided in [1].
However the use of gypsum as a stabilizing agent is currently not clear. This paper deals with the performance of the gypsum as an additive for treatment of the expansive clay soils by means of swell potential and strength. Optimum water content for the best compaction of the bentonite was first determined by standard compaction tests ...
The substitution of 5% cement clinker by 5% gypsum or 5% limestone additive as well as the fineness of limestone was studied about its effects on the strength of cement. The study show that the gypsum additive of 5% increase the strength of cement at the time of 1, 3, 7, 28 days (R= 55.1 MPa of cement with 5% substituted additive comparable to ...
Gypsum: Gypsum is a light weight material which is formed as the result of evaporating sea water in massive prehistoric basins. In terms of its chemical composition, it is Calcium Sulphate Di-hydrate (CaSO4.2H2O) and ... To suggest the optimum percentage of addition above additives in concrete number of cubes with different percentage were cast ...
Gypsum is a very popular mineral additive used in autoclaved aerated concrete (AAC) technology. In many studies, tobermorite can be synthesized from calcium-silicate-hydrate (C-S-H) phase under hydrothermal conditions in the presence of gypsum, and its impact on the tobermorite content in the AAC blocks has been discussed.
as partial cement replacement when heated in an oven at 100OC for 12 hours. The amount of eggshell used was at 5% partial cement replacement which was the optimum based on the work of Yerramala (2014). In this study, GMS and EGS are utilized as a partial cement replacement for non-load bearing concrete hollow blocks (CHB).
DOI: 10.1016/J.JMRT.2017.08.005 Corpus ID: 21752578; Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement @article{Caillahua2017TechnicalFF, title={Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement}, author={Mariella Cortez Caillahua and …
OPC paste with a water cement ratio 0.4 to 0.5 was prepared by mixing 500 grams of ordinary Portland cement, a fixed amount of sugar of 0.02% by weight of cement with a combination of different ...
To obtain these desirable properties the application of several numbers of chemical admixtures and mineral additives in gypsum were found necessary. ... Characteristics of acrylic latex-modified and partially epoxy-impregnated …
For more than a decade, significant research efforts in civil engineering and construction have focused on sustainable building materials in order to reduce the industry´s carbon footprint [1], [2].Considering the relatively low calcination temperature of gypsum (i.e., calcination T of industrial gypsum being 135–180°C and that of lime and cement being ∼900°C and ∼1400°C ...
gypsum performed better than replacing cement with only gypsum. Combining fly ash (20%) and powdered gypsum (10%) with cement (70%) yielded results comparable to plain cement after aging 91 days, demonstrating that up to 10% powdered gypsum can be used in concrete without showing adverse effects on its mechanical properties.
On the other hand, cement production emits a lot of toxic gases in the atmosphere which causes environmental pollution and greenhouse gases. Thus, CSA might be utilized as a cementitious material ...
The primary function of gypsum in cement lies in slowing down the hydration process. Cement, upon contact with water, swiftly reacts with C3A, leading to rapid hardening. This quick pace …
Gypsum is one of the additive raw materials added to the clinker grinding process that regulate the binding time of cement or commonly known as a retarder.
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 cement is that, when the water is added into cement, it starts …
The commercial ordinary Portland cement P.O 42.5 was applied in accordance with the Chinese standard GB 175–2020 [21].Its chemical compositions and mineral compositions are listed in Table 1 and Table 2, respectively.Aqueous solution of chemically pure triethanolamine was added to cement mortar at the dosages of 0.02 wt%, 0.1 wt% and 0.5 …
The setting times of the three cements formed by using different proportions of red gypsum as an additive were also obtained with a Vicat apparatus equipped with a normalized noodle with a 1.13 ... further increasing confidence in the viability of RG as a set retardant additive in cement fabrication.
The effects on the setting and mechanical properties of partly-refined boro- and phosphogypsum mixed with Portland and trass cements were studied and compared with a Portland cement containing high grade natural gypsum.
This paper aims to investigate drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash (AAHF) paste by using FGD-gypsum (FGD) and dolomite (DLM) as expansive additives. The 10 M sodium hydroxide combined with sodium silicate solutions were used as alkaline activator for all mixes. The preparation of AAHF paste was …
Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive. Cement Concr. Compos., 34 (7) (2012), pp. 819-824. View PDF View article View in Scopus ... Study on the performance of FGD gypsum-metakaolin-cement composite cementitious system. Construct. Build. Mater., 128 (2016), pp. 1-11. View PDF View ...
Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive. Cement Concr. ... Physical and chemical properties of concrete using GGBFS-KRslag-gypsum binder. Constr. Build. Mater., 123 (2016), pp. 436-443. View PDF View article View in Scopus Google Scholar. Davidovits, 1989.
