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This paper presents the findings of a preliminary study of the dependence of resilient modulus of cement stabilized phosphogypsum on various material parameters In particular the dependence of the resilient modulus on cement content dry unit weight moisture content and curing time was determined It was found that the resilient modulus increases with increasing density cement content
know morePhosphogypsum Mix Test Results Normal Consistency The normal consistency was conducted as per IS 40311988 It was observed that phosphogypsum provides additional stiffness to the paste and therefore it was required to add water for desired penetration of Vicats plunger However for five percent replacement of rawphosphogypsum the normal consistency is very close to standard
know morecement phosphogypsum could be used as a replacement of natural gypsum which plays the role of a set retarder [14 15] on the other hand Bagade et al studied the partial replacement of cement by various percentage of phosphogypsum gave good result with concrete specimens [16] Researches [17 18] on the basic engineering properties of phosphogypsum based concrete mixtures concluded that the
know moreTreatment of Phosphogypsum Waste for Use as an Additive in the Manufacture of Cement and Ceramics Islaam Anouar1 4 the non dryness of the cement the delayof setting and the problem of tiles we carried out a solid liquid extraction test at the laboratory scale using an organic solution and comparing it at some time to leaching by the mineral solution method
know morePhosphogypsum Waste for Portland Cement Production Oluwatimilehin G Aremu; & Dr A Manasseh Chemical Engineering Department Federal University of Technology Minna Niger State P M B 65 Nigeria Abstract Phosphogypsum PG the by product of phosphoric acid industry consists of CaSO 2 O and contains some impurities such as P 2 O 5 F and organic substances that seriously restrict
know morecement 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 embarked on a thermal process development program that continues today This proposal was
know morecement [3 4] Untreated phosphogypsum can be used for trass cement but it does not fit for regulation of setting times of Portland cement [12] Untreated phosphogypsum can be used to regulate Portland cement setting times only adding phosphogypsum into raw mixture prepared for burning the clinker The addition of phosphogypsum to the cement raw mixture shows that the burning temperature
know moreCement of cement with phosphogypsum The percentage increase in PG Mortar Mix IS 4031 Part 6 1988 compressive strength at 10% pho The standard mix proportion of 1 3 by weight was considered for the test The proportions of phosphogypsum were varied from 0% 5% 10%and 15% of cement by dry weight The strength was found to decrease at 15% replacement The results of c Fig 3 Compressive
know moreFor phosphogypsum employed as a cement retarder instead of natural gypsum the such 2 problems as soluble P component and high moisture therein must be solved to avoid the excessive retardation as well as the difficult feeding and pipe blocking 2 ways of making phosphogypsum into solidified body in size of 50 mm×50 mm are presented and some comparison are made in physical characteristic of
know moresulfoaluminate cement ladle slag and phosphogypsum Visa Isteri 1 Katja Ohenoja2 Theodore Hanein3 Pekka Tankanen1 Hajime Kinoshita3 Mirja Illikainen2 Timo Fabritius1 ABSTRACT Calcium sulfoaluminate belite CSAB cement clinkers were produced using two industrial by products ladle slag and phosphogypsum The phase composition of the produced clinkers was identified using quantitative
know morePortland cement the basic ingredient of concrete and is manufactured by crushing milling and proportioning limestone sand clay iron ore and secondary materials such as shells chalk or marl combined with shale slate or blast furnace slag fly ash gypsum phosphogypsum and some others Evaluating the physical and mineralogical characteristics of the cement and its chemical composition …
know moreThe standard consistency of the cement used is % Phosphogypsum Phosphogypsum is a by product in the wet process for manufacture of phosphoric acid ammonium phosphate fertilizer by the action of sulphuric acid on the rock phosphate The other sources of phosphogypsum are by products of hydrofluoric acid and boric acid industries Current worldwide production of phosphoric acid yields
know moreSuper sulfated cement SSC is a newly developed unburnt cementitious material It is a kind of environmental friendly cementitious material due to its energy saving carbon emission reducing and waste utilization It mainly composes of phosphogysum PG and ground granulated blast furnace slag GFS with a small amount of cement In Vietnam the Diammonium Phosphate DAP Dinh Vu fertilizer
know moreDeshpande Pradyot Sudhakar The determination of appropriate phosphogypsum Class C fly ash Portland Type II cement compositions for use in marine applications 2021 LSU Master s Theses …
know morePhosphogypsum to gypsum cement & sulphuric acid The second life of chemical waste materials as sustainable recyclables in the construction industry Dirk Köster thyssenkrupp Industrial Solutions AG Division Phosphates & Sulphates Technologies Dortmund Germany The production of phosphoric acid from natural phosphate rock by means of the wet process gives rise to an industrial by product
know moreCement of cement with phosphogypsum The percentage increase in PG Mortar Mix IS 4031 Part 6 1988 compressive strength at 10% pho The standard mix proportion of 1 3 by weight was considered for the test The proportions of phosphogypsum were varied from 0% 5% 10%and 15% of cement by dry weight The strength was found to decrease at 15% replacement The results of c Fig 3 …
know morefollowing mechanically activated phosphogypsum cement pozzolana PGCP compositions were proposed 70 % PG 20 % cement 10 % microsilica and 60 % PG 20 % cement and 20 % opoka In this work PG which was partially hydrated and had lost binding properties was used PG properties are tightly related to its storage period till the mechanical activation [17] Such relatively large amount of
know morecement and thus water requirement of the cement phosphogypsum mix minutely affected But further replacements of ordinary Portland cement with raw PG seriously affect the consistency Phosphogypsum in ordinary Portland cement mixes considerably retards setting time but does not contribute to produce unsound cement paste Phosphogypsum can be economically used up to five …
know moreINFLUENCE OF THE PRESENCE OF PHOSPHOGYPSUM IN CEMENT FINANCIAL EVALUATION CONCLUSIONS REFERENCES Keywords Cement Gypsum Phosphate based phosphogypsum Sulfate resistance Setting time Related /books books Thomas Telford Publishing / Cement Combinations for Durable Concrete Cement Combinations for Durable Concrete Proceedings of …
know morecement with phosphogypsum at different water/ binder ratios The above studies reveal the use of phosphogypsum as a waste material which can be better utilized in the production of concrete for road applications and soil stabilization Smadi et al 1999 investigated the influence of phosphogypsum on the times of setting and soundness of cement pastes In this study cement paste mixtures
know moreuate the properties and behavior of cement stabilized phos phogypsum when used as a base material Recommendations for additional studies are also presented MATERIALS Phosphogypsum In Louisiana Freeport McMoran Inc FMI uses the dihy drate modification of the wet process to produce phosphate fertilizers Therefore the phosphogypsum used in this study is in the dihydrate form that …
know morePhosphogypsum 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 collected from a local fertilizer industry Properties of phosphogypsum were evaluated and then the effect of various level phosphogypsum addition 2 5 10 and 15 percent by weight of cement with Portland
know moreThe compressive strength and pore microstructure of supersulfated cement SSC pastes with different kinds of gypsum different treatments on phosphogypsum and different fineness and ordinary Portland cement slag Portland cement were investigated The results indicate that phosphogypsum SSC performs better compared to anhydrite and dihydrate gypsum SSC for …
know moreIt is shown that Portland cement can be replaced with super sulfated cement based on Vietnam phosphogypsum to develop a good and hardened concrete to achieve economy; The compressive strength of concrete can achieve 20 40MPa This value is enough for the use of the eco concrete in the construction industry The results also indicate that the increase of replacement of phosphogypsum in concrete
know morecement is replaced with Phosphogypsum in percentage of 0 to 10 the compressive strength of concrete increases from MPa to MPa and MPa to MPa when cured for 7 and 28 days respectively When percentage of Phosphogypsum is increased from 10 to 30 it causes decrease in compressive strength of concrete from MPa to MPa and from MPa to MPa when …
know moreThe laboratory results indicate that cement stabilized phosphogypsum mixes have potential applications as road base and sub base materials This research was developed under the sponsorship of FAPESP INTRODUCTION The production of phosphoric acid a major constituent of many fertilizers results in a solid byproduct called phosphogypsum This material which consists mainly of calcium
know moreIn order to consume as much phosphogypsum as possible sulfate rich belite sulfoaluminate cements are produced by incorporating high amounts of phosphogypsum into the raw mix The presence of sulfate in the clinker is in the form of anhydrite in addition to calcium sulfoaluminate The aim of this paper is to study the effect of anhydrite on cement properties and the hydration process
know moreordinary Portland cement phosphogypsum and cement plus phosphogypsum was carried out and on the basis of chemical analysis the Bogue s compounds were calculated The results of chemical analysis indicates cement and 5% phosphogypsum mix produce appropriate quantities of C3S and SO3 which are mainly responsible for production of C S H calcium silicate hydrate and ettringite Calcium …
know moregypsum Portland cement and circulating fluidized bed slag is shown in Table 1 The as received phosphogypsum waste water and w/% CaO were mixed by ball milling and then the mixture was dried at 40 °C for 24 h to obtain the calci fied phosphogypsum which possesses the CaO amount corresponding to the P content in phosphogypsum waste
know moreBefore the use of phosphogypsum in the cement production as setting regulator is necessary to do a thermal study to avoid the false setting by the production of hemihydrate and anhydrate phases The mineralogical composition of Spanish phosphogypsum PGS was approximately of 64% of CaSO 4 ·2H 2 O; 33% CaSO 4 · 2 O and 3% of CaSO 4
know morePhosphogypsum in the Circular Economy AAPFCO 2021 Ft Lauderdale FL Dr Brian Birky FIPR Institute ^Wet Process Phosphoric Acid Production and Phosphogypsum PG fluorapatite Ca 10 F 2 PO 4 6 10H 2 SO 4 10nH 2O → 10CaSO 4•nH 2 O PG 6H 3 PO 4 2HF Di hydrate process n=2 Hemi hydrate process n=1/2 •Dihydrate process producing tons of PG per ton of P 2 O 5
know morePhosphogypsum with cement and fly ash waste for soil change This paper additionally demonstrates the aftereffects of concrete adjustment and cement Phosphogypsum adjustment In this examination paper it can be watched that when versatility of treated soil is decreased as far as possible esteems raise Investigation with bond and Phosphogypsum by and large diminishes the versatility of soil
know moreThis article investigates the effects of phosphogypsum PG pH and particle fineness on the mechanical properties of cement PG stabilized soil Using solutions of calcium hydroxide Ca OH 2 and sulfate H2SO4 to adjust pH value of PG from 2 to 8 The key pore size used to characterize PG fineness was determined to be 200 μm based on the Grey relational analysis GRA and the fineness of
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