The PBG cement was prepared using phosphogypsum waste, and the 28-day compressive strength of the cement can exceed 60 MPa. ... Therefore, the use of PG to produce high-performance materials becomes the focus of research. With 45 % PG, 10 % steel slag, 35 % iron slag, ...
However, the hydration rate of fluorogypsum mixed with KHCO 3 was higher than that of K 2 CO 3 when it was hydrated for 28 days. Because CO 3 2ions are more likely to combine directly with Ca 2 ...
Phosphogypsum can be chemically treated and become more suitable for the use of cementitious systems at a large scale in a more economical way.
The addition of no more than 30% phosphogypsum can enhance mechanical characteristics, reduce porosity, refine pore size distributions and densify the …
that a part of ordinary Portland cement can be replaced with phosphogypsum to develop a good and hardened concrete to achieve economy; above 10% replacement of phosphogypsum in ... does not contribute to produce unsound cement paste. The compressive strength of phosphogypsum cement concrete with five and ten percent …
Wang et al. prepared phosphogypsum based cement by mixing 20% phosphogypsum, 72% blast furnace slag and 8% carbide slag into powder. The strength grade of concrete prepared with this cement can meet the standard of C40 concrete [20]. As described above, the current industrial solid waste of phosphogypsum is mainly …
Natural materials are usually targeted as a replacement of ordinary cement past in order to attain a high compressive strength, longer workability, lower water consumption, better soundness, etc. El-Hasan and Al-Hamaideh (2012) used Tripoli as a partial replacement of OPC, and they reported that increasing the replacement ratio of Tripoli did not affect the …
746 G.M. Sadiqul Islam et al. / Procedia Engineering 171 ( 2017 ) 744 – 751 calcined phosphogypsum were used in mortar and concrete at the replacement level of 0%, 2%, 5%, 10% and 15% where ...
Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. This critical review provides an overview of …
Phosphogypsum (PG) is an industrial waste from the production of phosphoric acid.The impurities in PG limit its utilization in building materials, and make PG decompose easily at high temperatures. Calcium sulphoaluminate (CSA) cements are insensitive to the presence of impurities and show some desirable performance. The aim …
The production of concrete will produce a lot of carbon dioxide and pollute the environment. Phosphogypsum is a solid waste generated during wet phosphoric acid treatment, and the use of ...
materials used were Cement, Fine aggregate, Coarse aggregate and Phosphogypsum. A. Cement Ordinary Portland cement (CEM I-42.5) was used. The cement has specific gravity of 3.15 and fineness of 2.9x105 mm2/g. B. Fine Aggregates Natural sand with specific gravity of 2.61 was used as fine aggregates in the concrete specimens.
2.1 Phosphogypsum Generation Processes. The wet and dry process are the two main commercial processes used to produce phosphoric acid from natural phosphate. The dry process consists of a thermal reduction of rock phosphate at 2000 °C using an electrical furnace in the presence of coke or silica.
Phosphogypsum (PG) is a radioactive industrial by-product produced in large quantities when processing phosphate ores into fertilizers. With rapid growth of high concentration phosphate and compound fertilizers production in China, PG production is increasing every year. ... Eco - concrete made with phosphogypsum-based super …
with the addition of phosphogypsum up to 10% replacement sphogypsum content, when compared with plain concrete is more than 17%. There is a significant reduction in the compressive strength beyond 10% phosphogypsum content. Thus the optimum amount of phosphogypsum in concrete is found to be 10%. ompression tests of various samples …
In the past, phosphogypsum was incorporated into a Portland cement mixture for use in road construction. The use of phosphogypsum for such purposes is banned under the EPA final rule issued on June 3, 1992, which amends 40 CFR 61 Subpart R. Radon (Rn-222) can be found emanating
The leachability of concrete is enhanced by the addition of phosphogypsum because it increases the concrete's permeability. Therefore, Phosphogypsum-containing concrete can be used to immobilize radioactive waste [12]. This study focuses on the use of Phosphogypsum in concrete mixtures as a partial …
Phosphogypsum (PG) is a by-product generated from the phosphorus fertilizer industry (phosphoric acid production). PG is similar to natural gypsum, but there are some differences, of which it contains some impurities such as water-soluble phosphate (P 2 O 5), water-soluble fluoride (F −) and P 2 O 5 substituted in the gypsum crystal …
As a source of gypsum, phosphogypsum can and does substitute natural gypsum as a soil amendment in many countries, including Australia, Brazil, and Spain, to name a few. Studies have even found that the application of phosphogypsum can increase crop yields in many cases. ... Phosphogypsum has been studied for use in cement, bricks, …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was...
Using phosphogypsum-based excess-sulfate cement (PESC) for the preparation of super retarding materials. • PESC can achieve initial setting for 86 hours and final setting for 134 hours without additional retarders, and its 28d-compressive strength is 24.9 MPa. • The retardation mechanisms of phosphogypsum in PESC has been …
This experimental study suggests that phosphogypsum from industrial waste can be used as a cement substitute in concrete production. After 7 and 28 days, fresh …
The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable …
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing for solution,namely, delaying the setting time and difficulty being fed into the cement mill. The soluble phosphates in PG behave as super …
as an alternative raw material for cement, to increase the strength of the concrete and as an anti-cracking agent (Al-Hwaiti et al. 2005; El Rafie et al. 2020; Folek et al. 2011; Tayibi et al. 2009; Turner 2013). Phosphogypsum is currently marketed in Brazil, China, Spain, India, Kazakhstan,
The Industrial Waste (phosphogypsum) is a waste product which was produced from the chemical industries. This waste material is used in concrete.
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw …
the composition of the raw material charge, it is possible to produce lime, cement, aggregate-type materials, or even lime-aggregate mixtures. The cement-sulphuric acid approach was relatively widely adopted in Europe starting in the 1920's with a most successful operation by Marchon in England where natural gypsum was used as a raw …
Many studies have suggested that phosphogypsum can be used as a substitute for natural gypsum to control the hydration reaction rate in Portland cement production . PG has also been used in the manufacturing of bricks: the incorporation of 30% of PG into annealed clay bricks provides a product that successfully satisfies the …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H 3 PO 4) production from natural phosphate rocks. Approximately 4–6 …
Current demand for waste recycling, phosphogypsum-based excess-sulphate slag cement (PESSC) as a sustainable cement prepared by solid wastes, urges enhancing its performance development based on microstructure optimisation. For the purpose of improving the performance and durability of PESSC used in …
The incorporation of phosphogypsum (PG) in magnesium potassium phosphate cement (MPPC) can promote the utilization of PG not only by utilising the phosphate impurity in PG, but also by ...
Phosphogypsum (PG), as an industrial by-product, has historically suffered from challenges in achieving efficient utilization, resulting in enormous accumulation and environmental contamination. In this study, a certain proportion of PG was employed as a substitute for sand in magnesium oxysulfate cement (MOSC). The effects of PG on the …
Table 3 illustrates the proportional designs of MOSC paste. According to previous studies, high content of LBM can result in high pH of cement paste and poor cement strength development while low content of LBM can cause to low amorphous phase and poor performance of cement [35].The present study established the a-MgO …
Traditional Portland cement is widely used in the preparation of various hydraulic concrete. However, the high alkalinity produced by cement hydration threatens the survival of aquatic animals …
binders to substitute natural gypsum. Neutralized phosphorgypsum can be applied as mineralizing admixture in calcination of Portland cement clinker. Adding 2 to 2.5% of phosphorgypsum as setting time regulator resulted in a similar physical and mechanical properties compared to mix made with natural gypsum. Another important
Treated phosphogypsum can be used as an ingredient of plaster [6, 7, 8]. The most important and motivating use of phosphogypsum could be in the construction industry. In the manufacturing process of cement, phosphogypsum could be used as a replacement of natural gypsum which plays the role of a set retarder [9, 10], or to reduce …
