Effect of M/P and Borax on the Hydration Properties of Magnesium Potassium Phosphate Cement Blended with Large Volume of Fly Ash

Yang, Yuanquan; Sun, Sihui

doi:10.1007/s11595-018-1948-z

Cited by 21 publications

(11 citation statements)

References 14 publications

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“…2 Effect of blast furnace slag (a) and boric acid (b) on the heat flow evolution of slag-volcanic ash phosphate geopolymer binder dissolution of boric acid, which limits the availability of protons (H + ) that requires for the subsequent dissolution of volcanic ash and slag. Therefore, it contributes to the decrease in reaction temperature or heat [19,21,22]. However, no delay was observed in the time for reaching the peak maximum of the heat released during the reaction.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…On the other hand, if the metal oxide is less reactive (low solubility in acid), this will delay the setting and strength development, so the control of the hardening reaction should be considered when producing phosphate cement. The addition of boric acid or borax at different percentages (borax/MgO mass ratio up to 40%) was reported effective for controlling hardening reaction [19][20][21][22]. That acid performed well on delaying the initial setting time of magnesium phosphate cement by forming a protective layer on particles of MgO, increasing the pH, and decreasing the temperature of the paste [21].…”

Section: Introductionmentioning

confidence: 99%

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Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid

Djobo

2021

J Aust Ceram Soc

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This work aimed to evaluate the role of the addition of blast furnace slag for the formation of reaction products and the strength development of volcanic ash-based phosphate geopolymer. Volcanic ash was replaced by 4 and 6 wt% of ground granulated blast furnace slag to accelerate the reaction kinetics. Then, the influence of boric acid for controlling the setting and kinetics reactions was also evaluated. The results demonstrated that the competition between the dissolution of boric acid and volcanic ash-slag particles is the main process controlling the setting and kinetics reaction. The addition of slag has significantly accelerated the initial and final setting times, whereas the addition of boric acid was beneficial for delaying the setting times. Consequently, it also enhanced the flowability of the paste. The compressive strength increased significantly with the addition of slag, and the optimum replaced rate was 4 wt% which resulted in 28 d strength of 27 MPa. Beyond that percentage, the strength was reduced because of the flash setting of the binder which does not allow a subsequent dissolution of the particles and their precipitation. The binders formed with the addition of slag and/or boric acid are beneficial for the improvement of the water stability of the volcanic ash-based phosphate geopolymer.

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Section: Reaction Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid

Djobo

2021

J Aust Ceram Soc

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“…Some researchers present a different observation suggesting the formation of AlKO6Si2 structure in the secondary hydration [40] (Table 5). In previous research, precipitation of stable heavy metal phosphates has been confirmed for e.g., Chen et al [41] showed the formation of lead phosphate precipitates (Ksp=7.9×10−43 at 25 °C) and various different lead phosphate containing phases were formed. Therefore, heavy metal phosphate formed are insoluble and hence prevent the leaching of heavy metals under adverse environmental conditions.…”

Section: Phases Present In Cbpc Productmentioning

confidence: 82%

Solidification and Stabilization of Spent Pine-cone Biochar using Chemically Bonded Phosphate Cement

Tyagi¹,

Annachhatre²

2023

E3S Web of Conf.

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Spent biochar is produced after adsorption of heavy metal which is hazardous by nature. A suitable disposal technique is required to prevent the leaching of heavy metals from spent biochar into the environment. This study highlights the solidification and stabilization (S/S) of copper loaded spent pine-cone biochar by chemically bonded phosphate cement (CBPC). The response surface methodology (RSM) was used to conduct S/S experiments in order to evaluate the compressive strength of CBPC products. The CBPC samples were prepared by varying biochar content (5-50 wt. %); W:S (0.15-0.3) and curing time(3-28d). Results illustrated that CBPC products containing biochar had higher compressive strength upto 12.8 MPa in comparison to CBPC without biochar i.e., upto 10.8 MPa. XRD and SEM analysis confirmed the presence of K-struvite (MgKPO4.6H2O), copper containing phases (Ca-Cu-Si), copper phosphate precipitates (Cu3(PO4)2) and filling of pore spaces by spent biochar. Highest compressive strength of 12.8 MPa was obtained at an optimized biochar content of 25%, W:S of 0.18 and curing time of 28 d. The evaluation of leaching potential by TCLP illustrated that stabilization of Cu (II) upto 99.9% was achieved in CBPC product. The risk assessment study revealed that there is no significant danger due to leaching of heavy metals from final CBPC product indicating that it can be readily disposed in the hazardous landfill sites.

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“…It can be seen from the table that the compressive strength of the specimen with an M:P of 2:1 at the age of 28 d is the largest, and the maximum can reach 55.63 MPa. Furthermore, the strength of the specimen without fly ash and silica fume is slightly greater than that with the addition of fly ash and silica fume, which is because the incorporation of fly ash and silica fume reduces the amount of guano stone (MgKPO 4 •6H 2 O) generated [27]. It can also be found from Table 3 that the compressive strength of MKPC mortar at 1 d and 7 d with the same M:P decreases with the increase of fly ash admixture and increases with the increase of silica fume admixture.…”

Section: Effect Of Compressive Strengthmentioning

confidence: 97%

High-Temperature Resistance of Modified Potassium Magnesium Phosphate Cement

et al. 2022

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To study the high-temperature mechanical properties of potassium magnesium phosphate cement mortar and the high-temperature resistance of its laminates. Potassium magnesium phosphate cement (MKPC) was prepared by using heavy-burning magnesium oxide and potassium dihydrogen phosphate as the main raw materials, borax as the retarder, and compounded with a certain amount of fly ash and silica fume. The effect of the mass ratio of magnesium to phosphorus (M:P), compounded fly ash and silica fume on the setting time and mechanical properties of MKPC was investigated. Furthermore, based on the better M:P, the compressive strength of MKPC mortar was studied after 3 h of constant temperature at 400 °C, 600 °C, and 800 °C, and the effect of fly ash and silica fume on the high-temperature resistance of MKPC was analyzed. The high-temperature resistance of MKPC was further evaluated by analyzing the temperature variation of potassium magnesium phosphate cement laminate during a constant temperature of 650 °C for 3 h. The results showed that the mechanical properties of potassium magnesium phosphate cement were influenced by different raw material ratios, and the mechanical properties of potassium magnesium phosphate cement were optimal when M:P was 2:1, fly ash was 5% and silica fume was 15%. The internal temperature of MKPC laminate increased slowly with time, and its high-temperature resistance was better.

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Effect of M/P and Borax on the Hydration Properties of Magnesium Potassium Phosphate Cement Blended with Large Volume of Fly Ash

Cited by 21 publications

References 14 publications

Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid

Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid

Solidification and Stabilization of Spent Pine-cone Biochar using Chemically Bonded Phosphate Cement

High-Temperature Resistance of Modified Potassium Magnesium Phosphate Cement

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