Effect of Phosphogypsum on the Properties of …
The present paper deals with the experimental investigation on compressive, tensile and flexural strength characteristics of partially cement replaced phosphogypsum concrete using 0%., 10%, 20% ...
Properties and high-temperature resistance of tailing-based …
In this paper, 60% of LBM was replaced by calcined phosphate tailings (PT) to prepare MOS cement. Phosphogypsum (PG) and water-binder (W/B) ratio were used to adjust the setting and strength development of the cement. Moreover, strength evolution of MOS cement after high-temperature exposure was investigated. Results showed that PG addition ...
Effect of phosphogypsum on physiochemical and …
The objectives of this study are: (1) to investigate the effect of phosphogypsum on the physiochemical behaviour of the cement stabilized soil; (2) to study the variation of strength …
Retardation mechanism of phosphogypsum in phosphogypsum …
The effect of phosphogypsum (PG) on the hydration and retardation mechanism of phosphogypsum-based excess-sulfate slag cement (PESC) was mainly investigated. Based on the natural characteristics of PG, such as low pH value and the presence of soluble phosphorus impurities, the content of PG passing the 4.75 mm standard sieve was used as a ...
Performance and hydration mechanisms of ultrafine iron ore …
This study systematically investigates the influence of ultrafine iron ore tailings (UIOT) on the performance and hydration process of supersulfated cement (SSC) with high phosphogypsum (PG) content. UIOT incorporation retards early-age strength but enhances later-age strength, with a 20 % replacement ratio of granulated blast furnace slag ...
Preparation of phosphogypsum ecological concrete and …
Based on the conditions of porosity and water-cement ratio, the optimal proportion of phosphogypsum-based eco-concrete was investigated, and concrete specimens with good performance were prepared (14 days compressive strength: 3.49 MPa, permeability coefficient: 1.37, total porosity: 24.5%, Improved compressive strength by 15% and water ...
Effect of varying water content and extreme weather …
Therefore, in author previous study, the high water content (110%) of sludge was innovatively solidified by the combination hemihydrate phosphogypsum (HPG), ground granulated blast furnace slag (GGBFS), and cement [16], and also studied samples' compressive strength and strength formation mechanism. However, the effect of different moisture ...
Mechanical Properties and Optimal Mix Design of …
The discussion on the process parameters of phosphogypsum cement micro silica fume system (PGCF) foam light soil and phosphogypsum cement slag powder system (PGCS) foam light soil shows that the optimal mix …
Incorporation of phosphogypsum with cement in rigid …
Phosphogypsum is one of many waste products that can be used to create concrete. Phosphogypsum is a by-product of the industrial sector that can be used to prepare concrete for less money by reducing the strength development of calcined products. 1. The slump cone test, used to measure how easily a concrete mixture can be worked, reveals that ...
Improvement of calcium sulfoaluminate cement with carbide …
Phosphogypsum (PG) is an industrial by-product with an annual global output exceeding 200 million tons [27], [28].Its primary component is calcium sulfate dihydrate, along with impurities such as phosphorus and fluorine [29].PG is commonly employed as a retarder in OPC, regulating the hydration process and extending the setting time [30], [31]. ...
Mechanical characteristics and microstructural changes in phosphogypsum …
Phosphogypsum (PG) is a solid waste by-product generated during the production of wet process phosphoric acid, with an annual ... (OPC) P.O. 42.5 produced by Hunan Ningxiang South Cement Co., Ltd. was used. The cement exhibited an initial setting time of 175 minutes and a final setting time of 225 minutes. The lime used was sourced from Hunan ...
Phosphogypsum-Based Ultra-Low Basicity Cementing …
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, granulated ground blast slag …
Modification of recycled cement with phosphogypsum and …
Concrete is one of the most widely used building materials. In recent years, about 30 billion tons of concrete have been consumed annually, and the consumption is still growing rapidly [1].Cement, the primary component in concrete, emits large amounts of CO 2 during its production, which accounts for 5–8 % of global anthropogenic CO 2 emissions [2].
Resource utilization and development of phosphogypsum …
Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production generates as many as 4–6 tons of PG, including more than 90% of CaSO 4 ·2H 2 O, a small amount of phosphorus, fluorine, organic matter, oxides, heavy metals, radioactive substances and other impurities that have serious …
Treating waste phosphogypsum for cement and plaster …
Portland cement was produced by intergrinding cement clinker with the impure phosphogypsum samples at 1.8% SO 3 content (3.87% pure CaSO 4 ·2H 2 O) to a fineness of 320–330 m 2 /kg (Blaine). The Portland slag cement was produced by intergrinding the granulated blastfurnace slag and cement clinker with 5.0% gypsum to a fineness of 400–420 m 2 /kg …
Wetting-drying effect on the strength and microstructure of cement …
The obtained homogeneous cement-phosphogypsum paste was transformed into a container 39.1 mm in diameter and 80 mm in height. The air bubbles were carefully removed by vibrating the container. The prepared sample inside the container was cured under standard conditions (temperature of (20 ± 2) °C and relative humidity of 95%) for 1 d.
Mechanical Properties and Optimal Mix Design of …
However, the conventional application of foam lightweight soil, predominantly cement-based, has raised concerns about pollution and high energy consumption due to large cement dosages. To address this issue, this …
Modification of recycled cement with phosphogypsum and …
This paper presents the rehydration performance of binary binders made with dehydrated cement paste (DCP) and phosphogypsum (GP). DCP was obtained by thermal treatment of hardened cement pastes in ...
Phosphogypsum as a construction material
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 lattice. PG and …
Effects of different treatment of phosphogypsum on …
In this paper, the effects of the phosphogypsum (PG) content at 0%–50% and the calcination at 750°C, 800°C, and 850°C on the properties of cement mortar were studied. It is …
Phosphogypsum in Road Construction: Composition and …
The integration of phosphogypsum with asphalt and concrete presents intriguing possibilities for enhancing road construction materials. When combined with asphalt, phosphogypsum can act as a filler, improving the density and stability of the mix. This combination helps in reducing voids and enhancing the overall durability of the pavement.
Utilization of solidified phosphogypsum as Portland cement retarder
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-retarder and …
Development and optimization of phosphogypsum-based geopolymer cement
Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (β-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) cement.
Mechanical Properties and Optimal Mix Design of Phosphogypsum Cement …
The optimal mix proportions for two types of foam lightweight soil, namely phosphogypsum cement microsilica foam (PGCF) and phosphogypsum cement slag powder foam (PGCS), were determined based on ...
Recycling of waste river sludge into unfired green bricks stabilized …
The current study is taken an attempt to reuse the waste river sludge (WRS) with high moisture content in the production of cost-effective unfired green bricks. For this purpose, hemihydrate phosphogypsum (HPG) was innovatively applied to dehydrate WRS, and different consecutive dosages of Ordinary Portland cement (OPC), sodium metasilicate (SMS) and …
High-Volume Phosphogypsum Cement Stabilized Road …
This study investigated the potential for efficient and resourceful utilization of phosphogypsum (PG) through the preparation of a High-volume Phosphogypsum Cement Stabilized Road Base (HPG-CSSB). The investigation analyzed the unconfined compressive strength (UCS), water stability, strength formation mechanism, microstructure, and pollutant …
Phosphogypsum: potential uses and problems – a review
By evaluating properties of cement paste, mortar and concrete it was concluded that 5-10% phosphogypsum addition in cement clinker gave good results. In general, the processing of phosphogypsum by ...
Microstructural and Phase Characteristics of Phosphogypsum-Cement
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 electron microscopy) and phase properties of …
Preparation of Sustainable Foamed Concrete Using High …
In the present work, sustainable foamed concrete with a high content of phosphogypsum (PG) was prepared through the combination activation and synergistic strengthening of waterglass, ground blast furnace slag (GBFS), and cement. The fluidity, mechanical properties, volume stability, and durability of this sustainable foamed concrete …
Effect of Phosphogypsum on the Properties of …
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...