The combined effects of calcium oxide and phosphate on burnt coal cinder-based cementitious materials

Huang, Muyang; Bao, Shenxu; Zhang, Yimin; Luo, Yongpeng; Xu, Xianqing; Santos, Ilídio Deocleciano Salomão Dos

doi:10.1016/j.conbuildmat.2022.129720

Cited by 15 publications

(6 citation statements)

References 40 publications

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“…A mass loss (about 3.34%) is revealed in the temperature range from 30 to 270°C due to the rapid loss of –OH. This is attributed to the loss of adsorbed water and phosphoric acid dehydroxylation 25,26 . The same results are also shown by the endothermic peaks of the DSC curve at 110 and 186.7°C, respectively.…”

Section: Resultssupporting

confidence: 69%

“…This is attributed to the loss of adsorbed water and phosphoric acid dehydroxylation. 25,26 The same results are also shown by the endothermic peaks of the DSC curve at 110 and 186.7 • C, respectively. Under heating conditions of 1200 • C, no physicochemical changes occurred in albite and muscovite.…”

Section: Thermal Analysissupporting

confidence: 70%

“…In addition, the uneven distribution of gels around the cracks formed a region with poor structure which is more likely to lead to stress fatigue and space faults. 26 EDS measurement is to better understand the distribution of Si, Al, and P in the PABG after different calcination temperatures. Four areas are randomly selected from the SEM image of each calcination temperature for measurement, and the results are shown in Table 6.…”

Section: Microstructural Characterization and Eds Resultsmentioning

confidence: 99%

“…Through the study of FT‐IR at different phosphoric acid to GP mass ratios and different calcination temperatures, the effect of the two on the synthetic PABG can be proved again. FT‐IR is particularly considered the powerful evidence of geopolymer structure 26 . As is shown in Figure 10, the absorption peaks produced at 3419–3435 and 1624–1638 cm −1 are attributed to the stretching vibration and bending vibration of –OH groups in water molecules, respectively 34,35 .…”

Section: Resultsmentioning

confidence: 99%

“…FT-IR is particularly considered the powerful evidence of geopolymer structure. 26 As is shown in Figure 10, the absorption peaks produced at 3419-3435 and 1624-1638 cm −1 are attributed to the stretching vibration and bending vibration of -OH groups in water molecules, respectively. 34,35 In Figure 10A, these two absorption peaks of GP 15 -300 are significantly reduced.…”

Section: Ft-ir Analysis Of the Pabg Samplesmentioning

confidence: 85%

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Preparation of granite powder–based geopolymer by synergistic action of calcination and phosphoric acid

Jia,

Huang,

Huang

et al. 2023

J Am Ceram Soc.

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Using the solid waste of granite powder (GP) to prepare green cementitious materials is of great significance for the sustainable development of the construction industry. In this study, a phosphoric acid–based geopolymer (PABG) was directly prepared from GP through a combination of phosphoric acid and calcination processes. Reaction mechanism of phosphoric‐activated GP is studied by techniques of X‐ray diffraction, thermal analysis, Fourier transform infrared spectroscopy, SE mode, and mercury intrusion porosimetry (MIP) taking calcination temperature, calcination time, and phosphoric acid as variables. The results indicated that the addition of 15 wt.% phosphoric acid and calcination at the temperature of 200°C for 90 min significantly increased compressive strength from 0.70 to 20.92 MPa. The calcination temperature was the most important factor in the synthesis of PABG using GP. The decrease of the peak value of mineral phase after calcination indicates that high temperature promotes the reaction between phosphoric acid and GP. According to the results of MIP, the gel generated by the reaction of phosphoric acid and GP refines the pore structure, which is conducive to the improvement of geopolymer properties. These research results provide a reference for the preparation of geopolymers directly using low pozzolanic active GP.

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Section: Resultssupporting

confidence: 69%

Section: Thermal Analysissupporting

confidence: 70%

Section: Microstructural Characterization and Eds Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%