The detailed manufacturing process and study strategy were described in Fig. 2, where the preparation of ESPSC pastes contained two steps, i.e., original phosphogypsum modification and new cementitious material fabrication.A mix of fresh phosphogypsum, slag, and cement with a proportion of 94:2:4 was wet-milled firstly for …
As detrimental byproduct waste generated during the production of fertilizers, phosphogypsum can be harmlessly treated by producing phosphogypsum-based …
1. Introduction. As more than 300 million tons of phosphate fertilizer is produced for agriculture demands every year [1], [2], effective utilization of the by-product, phosphogypsum, has been put forward since 2010.Phosphogypsum-based excess-sulphate slag cement (PESSC), composed of more than 40% phosphogypsum, slag, …
Excess-sulfate phosphogypsum slag cement (ESPSC) is a low-carbon cementitious material. It comprises 40–50 % PG, 30–40 % granulated blast furnace slag, and a small amount of cement as an activator [16]. The ESPSC exhibits excellent later-age compressive strength [17], sulphate resistance [18] and water resistance [19].
Abstract. Phosphogypsum is a by-product of the phosphate fertilizer industry. It is generally treated by stacking, which not only causes environmental pollution, but also wastes …
partial replacement of cement with treated phosphogypsum (PG) in concrete. Phosphogypsum has been used with 3%, 7% and 10% percentages as partially replacement of cement. Results indicated that 10% of PG has improved the setting time, compressive strength, tensile strength and permeability of concrete. Further, it does not …
1. Introduction. Phosphogypsum (PG) is an industrial by-product gypsum produced by the phosphorus chemical industry, which contains a variety of impurities including acids, fluorides, organics and others (Cuadri et al., 2014; Qin et al., 2023; Wu et al., 2022a).Statistics show that wet production of 1t of phosphoric acid produces 4.55 t …
Alawi Zawawi, Vice Chairman of USG Boral Zawawi Gypsum, a leading player in the export of natural gypsum, said that Oman has the potential to export …
Based on the physical and chemical properties of red sandstone (RS), RS is used to produce composite cementitious materials. The flowability, mechanical strength, and micromechanics of a red sandstone–cement binary cementitious material (RS-OPC) were investigated as functions of the amount of RS replacing the cement (OPC). …
1PG Student, Dept. of Civil Engineering, Mar Athanasius College of Engineering, Kerala, India 2Assistant Professor, Dept. of Civil Engineering, Mar Athanasius College of Engineering, Kerala, India -----***-----Abstract Phosphogypsum (PG) is a solid by-product of the production of phosphoric acid, a major constituent of many fertilizers, chemical …
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 …
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 and plants. In this paper, a new eco-friendly, ultra-low alkalinity, cementitious material was prepared with industrial waste phosphogypsum, …
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 to …
Some studies showed that the soluble phosphorus and fluorine in the PG would react with Ca(OH) 2 produced by cement hydration and then generate precipitates coating the surface of the cement particles, which would restrict cement hydration causing longer setting time and lower early strength [38], [39], [40]. Therefore, it is essential to …
Building elements made of phosphogypsum, such as wallboards and similar construction elements, give yield to high values of radon emanation together with the mentioned elevated concentrations of 226 Ra. Phosphogypsum can be used in Portland cement as a setting time retarder in amounts below 4–5 wt%; then, it is diluted in the concrete and ...
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 …
The present study is an experiment, as a binding substance, OPC 53 grade was chosen. 2400 kg/m3 cement density The Le Chateliers Flask method is used to evaluate cement relative density as per IS 12269:2013 [9].Cement has …
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 …
The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and atmosphere. Therefore, this paper analyzes the directions of phosphogypsum recycling and possible alternatives to its use. The main …
Phosphogypsum (PG) is a bulk industrial solid waste generated during phosphoric acid manufacturing. This study investigated a novel phosphogypsum-based geopolymer (PBG) cement through L 16 (4 5) orthogonal experiments.The impact of five alkaline activators, including Portland cement clinker (PCC), sulfate alumina cement clinker (SACC), …
Since 1983, Oman Cement Company has symbolized Oman's drive for self-reliance in core industries. We Have given new strength to the construction industry, consolidated the nation's efforts for infrastructure development and …
In this study, usability of weathered phosphogypsum (PG) from residue areas as set retarder in Portland cement was investigated. The effects on the setting and mechanical properties of PG added in ratios 1, 3, 5, 7, 10, and 12.5 wt.% to Portland cements were studied and compared with a Portland cement containing natural gypsum …
Semantic Scholar extracted view of "The using of waste phosphogypsum and natural gypsum in adobe stabilization" by N. Değirmenci ... Potential use of phosphogypsum in concrete. M. Smadi R. Haddad ... cement and Sarooj (artificial pozzolan) on the swelling potential of an expansive soil from Oman. A. Al-Rawas A. …
1. Introduction. Supersulfated cement (SSC) is a binder with little Portland cement clinker. It is usually made up of 75–85 % granulated blast furnace slag (GGBFS), 10–20 % calcium sulfate, and less than 5% alkaline activator [1], [2], [3], [4].SSC is a low-carbon cementitious material, and its main raw material, slag, comes from a by-product …
The Industrial Waste (phosphogypsum) is a waste product which was produced from the chemical industries. This waste material is used in concrete.
Singh, Treating waste phosphogypsum for cement and plaster manufacture, Cement and Concrete Research 32(7) (2002) 1033-1038. [12] M. Singh, Role of phosphogypsum impurities on strength and microstructure of selenite plaster, Construction and building materials 19(6) (2005) 480-486. [13] M. Taher, Influence of thermally treated …
cement from phosphogypsum and phosphatic tailings sand. SO2 would have been produced as a by-product for conversion to sulphuric acid, The process was not successful in that it was not possible to obtain the high-quality cement product. With the funding of "Gypsum By-Product Exploitation," the Institute
Mortars and concretes produced with PG-based cementitious systems achieve high compressive strength levels (60 MPa, 70 MPa, 80 MPa) and accomplish the requirements of the European standards EN 998-1, EN 998-2, EN 13813, Eurocode …
The aim of the tests in this paper is to investigate the shrinkage properties of phosphogypsum-cement mixtures and the influence of thefactors, such as moisture content (MC), phosphogypsum/cement ratio (P/C), curing conditions, the relation between shrinkage and moisture loss, comparison of shrinkages of the compacted and vibrated …
The effects of the tricalcium aluminate (C 3 A) content of the stabilizing cement [Type II (1.3% C 3 A) cement and Type III cement (9.3% C 3 A)], curing time (seven to 90 days), proportion of PG (5–60%), grain size, and impurities in phosphogypsum (PG) (PG compared to gypsum) on the microstructural (by scanning …
The unconfined compressive strength (UCS), split tensile strength (STS), freeze-thaw cycles, and shrinkage tests were used to evaluate the mechanical …
Phosphogypsum (PG) is the primary byproduct generated during the production of phosphoric acid, an intermediate product in phosphate fertilizer production, from calcium phosphate (apatite) ore. PG also exists in very small amounts in nature where it is the result of natural guano processes as they took for instance place in the …
1. Introduction. Supersulfated cement (SSC) is a kind of environment-friendly cement as well as a newly developed non-burnt cementitious material with less clinker or even without clinker [1], [2].The common compositions of SSC are always about 75–85% ground granulated blast furnace slag (slag), 10–20% gypsum as sulfate activator, and …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded …
In order to remove impurities in phosphogypsum, phosphogypsum can be modified by wet grinding. Under the condition of water to cement ratio of 0.43, phosphogypsum paste was prepared by mixing phosphogypsum, slag powder and cement at the ratio of 45:1:2, wet grinding for 1 h and aging for 24 h [11], [29]. PPSC …