[4] [4] DAVIDOVITS J. Synthesis of new high-temperature geo-polymers for reinforced plastic/composites［C］. PACTEC 79 Society of Plastics Engineers, 1979: 151-154.

[5] [5] ZHAO J H, TONG L Y, LI B E, et al. Eco-friendly geopolymer materials: a review of performance improvement, potential application and sustainability assessment［J］. Journal of Cleaner Production, 2021, 307: 127085.

[6] [6] MAJDOUBI H, MAKHLOUF R, HADDAJI Y, et al. Valorization of phosphogypsum waste through acid geopolymer technology: synthesis, characterization, and environmental assessment［J］. Construction and Building Materials, 2023, 371: 130710.

[7] [7] MARSH A, HEATH A, PATUREAU P, et al. Alkali activation behaviour of un-calcined montmorillonite and illite clay minerals［J］. Applied Clay Science, 2018, 166: 250-261.

[8] [8] SEDMALE G, RANDERS M, RUNDANS M, et al. Application of differently treated illite and illite clay samples for the development of ceramics［J］. Applied Clay Science, 2017, 146: 397-403.

[9] [9] BERNASCONI D, VIANI A, ZRYBNICK L, et al. Phosphate-based geopolymer: influence of municipal solid waste fly ash introduction on structure and compressive strength［J］. Ceramics International, 2023, 49(13): 22149-22159.

[10] [10] SASUI S S, KIM G, NAM J, et al. Strength and microstructure of class-C fly ash and GGBS blend geopolymer activated in NaOH&NaOH+Na2SiO3［J］. Materials, 2019, 13(1): 59.

[11] [11] DJOBO J, STEPHAN D, ELIMBI A. Setting and hardening behavior of volcanic ash phosphate cement［J］. Journal of Building Engineering, 2020, 31: 101427.

[12] [12] KUMAR P K, SRINIVASU K. Influence of GGBS and concentration of sodium hydroxide on strength behavior of geopolymer mortar［J］. Materials Today: Proceedings, 2022, 65: 702-706.

[13] [13] ZULKIFLY K, HEAH C Y, LIEW Y M, et al. Effect of phosphate addition on room-temperature-cured fly ash-metakaolin blend geopolymers［J］. Construction and Building Materials, 2021, 270: 121486.

[14] [14] WANG Y S, ALREFAEI Y, DAI J G. Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer［J］. Cement and Concrete Research, 2020, 127: 105932.

[15] [15] MA S, ZHANG Z, LIU X. Comprehensive understanding of aluminosilicate phosphate geopolymers: a critical review［J］. Materials, 2022, 15(17): 5961.

[16] [16] DAVIDOVITS J. Geopolymers［J］. Journal of Thermal Analysis, 1991, 37(8): 1633-1656.

[17] [17] KHALE D, CHAUDHARY R. Mechanism of geopolymerization and factors influencing its development: a review［J］. Journal of Materials Science, 2007, 42(3): 729-746.

[18] [18] YAO X, ZHANG Z H, ZHU H J, et al. Geopolymerization process of alkali-metakaolinite characterized by isothermal calorimetry［J］. Thermochimica Acta, 2009, 493(1/2): 49-54.

[19] [19] MUIZ-VILLARREAL M S, MANZANO-RAMREZ A, SAMPIERI-BULBARELA S, et al. The effect of temperature on the geopolymerization process of a metakaolin-based geopolymer［J］. Materials Letters, 2011, 65(6): 995-998.

[20] [20] KUMAR A, KUMAR S. Development of paving blocks from synergistic use of red mud and fly ash using geopolymerization［J］. Construction and Building Materials, 2013, 38: 865-871.

[21] [21] DAVIDOVITS J. Geopolymers and geopolymeric materials［J］. Journal of Thermal Analysis, 1989, 35(2): 429-441.

[22] [22] NATH S K, MUKHERJEE S, MAITRA S, et al. Ambient and elevated temperature geopolymerization behaviour of class F fly ash［J］. Transactions of the Indian Ceramic Society, 2014, 73(2): 126-132.

[23] [23] BAJPAI R, CHOUDHARY K, SRIVASTAVA A, et al. Environmental impact assessment of fly ash and silica fume based geopolymer concrete［J］. Journal of Cleaner Production, 2020, 254: 120147.

[24] [24] GAO L, ZHENG Y X, TANG Y, et al. Effect of phosphoric acid content on the microstructure and compressive strength of phosphoric acid-based metakaolin geopolymers［J］. Heliyon, 2020, 6(4): e03853.

[25] [25] KHABBOUCHI M, HOSNI K, MEZNI M, et al. Interaction of metakaolin-phosphoric acid and their structural evolution at high temperature［J］. Applied Clay Science, 2017, 146: 510-516.

[26] [26] RAVEN K P, LOEPPERT R H. Microwave digestion of fertilizers and soil amendments［J］. Communications in Soil Science and Plant Analysis, 1996, 27(18/19/20): 2947-2971.

[27] [27] BARTOS J M, MULLINS G L, SIKORA F J, et al. Availability of phosphorus in the water-insoluble fraction of monoammonium phosphate fertilizers［J］. Soil Science Society of America Journal, 1991, 55(2): 539-543.

[28] [28] WAGH A S. Chemically bonded phosphate ceramics-a novel class of geopolymers[C]//Advances in Ceramic Matrix Composites X: Proceedings of the 106th Annual Meeting of the American Ceramic Society. Indiana: Ceramic Transactions, 2004: 107.

[29] [29] PU S Y, ZHU Z D, SONG W L, et al. Mechanical and microscopic properties of fly ash phosphoric acid-based geopolymer paste: a comprehensive study［J］. Construction and Building Materials, 2021, 299: 123947.

[30] [30] DJOBO J N Y, NKWAJU R Y. Preparation of acid aluminum phosphate solutions for metakaolin phosphate geopolymer binder［J］. RSC Advances, 2021, 11(51): 32258-32268.

[31] [31] GUO C M, WANG K T, LIU M Y, et al. Preparation and characterization of acid-based geopolymer using metakaolin and disused polishing liquid［J］. Ceramics International, 2016, 42(7): 9287-9291.

[35] [35] LOUATI S, BAKLOUTI S, SAMET B. Acid based geopolymerization kinetics: effect of clay particle size［J］. Applied Clay Science, 2016, 132/133: 571-578.

[36] [36] ZRIBI M, BAKLOUTI S. Investigation of phosphate based geopolymers formation mechanism［J］. Journal of Non-Crystalline Solids, 2021, 562: 120777.

[37] [37] TCHAKOUT H K, RSCHER C H, KAMSEU E, et al. The influence of gibbsite in kaolin and the formation of berlinite on the properties of metakaolin-phosphate-based geopolymer cements［J］. Materials Chemistry and Physics, 2017, 199: 280-288.

[38] [38] TCHAKOUT H K, RSCHER C H. Mechanical and microstructural properties of metakaolin-based geopolymer cements from sodium waterglass and phosphoric acid solution as hardeners: a comparative study［J］. Applied Clay Science, 2017, 140: 81-87.

[39] [39] DOUIRI H, LOUATI S, BAKLOUTI S, et al. Structural, thermal and dielectric properties of phosphoric acid-based geopolymers with different amounts of H3PO4［J］. Materials Letters, 2014, 116: 9-12.

[40] [40] TCHAKOUT H K, RSCHER C H, KAMSEU E, et al. Influence of the molar concentration of phosphoric acid solution on the properties of metakaolin-phosphate-based geopolymer cements［J］. Applied Clay Science, 2017, 147: 184-194.

[41] [41] MORSY M S, RASHAD A M, SHOUKRY H, et al. Potential use of limestone in metakaolin-based geopolymer activated with H3PO4 for thermal insulation［J］. Construction and Building Materials, 2019, 229: 117088.

[42] [42] LOUATI S, BAKLOUTI S, SAMET B. Geopolymers based on phosphoric acid and illito-kaolinitic clay［J］. Advances in Materials Science and Engineering, 2016, 2016: 1-7.

[43] [43] MATHIVET V, JOUIN J, GHARZOUNI A, et al. Acid-based geopolymers: understanding of the structural evolutions during consolidation and after thermal treatments［J］. Journal of Non-Crystalline Solids, 2019, 512: 90-97.

[44] [44] WANG Y S, DAI J G, DING Z, et al. Phosphate-based geopolymer: formation mechanism and thermal stability［J］. Materials Letters, 2017, 190: 209-212.

[45] [45] PERERA D S, HANNA J V, DAVIS J, et al. Relative strengths of phosphoric acid-reacted and alkali-reacted metakaolin materials［J］. Journal of Materials Science, 2008, 43(19): 6562-6566.

[46] [46] LIN H, LIU H, LI Y, et al. Properties and reaction mechanism of phosphoric acid activated metakaolin geopolymer at varied curing temperatures［J］. Cement and Concrete Research, 2021, 144: 106425.

[47] [47] DONG T, XIE S B, WANG J S, et al. Properties and characterization of a metakaolin phosphate acid-based geopolymer synthesized in a humid environment［J］. Journal of the Australian Ceramic Society, 2020, 56(1): 175-184.

[48] [48] CELERIER H, JOUIN J, TESSIER-DOYEN N, et al. Influence of various metakaolin raw materials on the water and fire resistance of geopolymers prepared in phosphoric acid［J］. Journal of Non-Crystalline Solids, 2018, 500: 493-501.

[49] [49] GUO H Z, YUAN P, ZHANG B F, et al. Realization of high-percentage addition of fly ash in the materials for the preparation of geopolymer derived from acid-activated metakaolin［J］. Journal of Cleaner Production, 2021, 285: 125430.

[50] [50] KATSIKI A, HERTEL T, TYSMANS T, et al. Metakaolinite phosphate cementitious matrix: inorganic polymer obtained by acidic activation［J］. Materials, 2019, 12(3): 442.

[52] [52] WANG Y S, PROVIS J L, DAI J G. Role of soluble aluminum species in the activating solution for synthesis of silico-aluminophosphate geopolymers［J］. Cement and Concrete Composites, 2018, 93: 186-195.

[53] [53] ZRIBI M, SAMET B, BAKLOUTI S. Effect of curing temperature on the synthesis, structure and mechanical properties of phosphate-based geopolymers［J］. Journal of Non-Crystalline Solids, 2019, 511: 62-67.

[54] [54] BEWA C N, TCHAKOUT H K, BANENZOU C, et al. Acid-based geopolymers using waste fired brick and different metakaolins as raw materials［J］. Applied Clay Science, 2020, 198: 105813.

[55] [55] ZHANG B F, GUO H Z, DENG L L, et al. Undehydrated kaolinite as materials for the preparation of geopolymer through phosphoric acid-activation［J］. Applied Clay Science, 2020, 199: 105887.

[56] [56] HE Y, LIU L P, HE L P, et al. Characterization of chemosynthetic H3PO4-Al2O3-2SiO2 geopolymers［J］. Ceramics International, 2016, 42(9): 10908-10912.

[57] [57] BEWA C N, TCHAKOUT H K, RSCHER C H, et al. Influence of the curing temperature on the properties of poly(phospho-ferro-siloxo) networks from laterite［J］. SN Applied Sciences, 2019, 1(8): 1-12.

[58] [58] POUGNONG T E, BELIBI P D B, BAENLA J, et al. Effects of chemical composition of amorphous phase on the reactivity of phosphoric acid activation of volcanic ashes［J］. Journal of Non-Crystalline Solids, 2022, 575: 121213.

[59] [59] MAHYAR M, ERDOAN S T. Phosphate-activated high-calcium fly ash acid-base cements［J］. Cement and Concrete Composites, 2015, 63: 96-103.

[60] [60] HE M, YANG Z B, LI N, et al. Strength, microstructure, CO2 emission and economic analyses of low concentration phosphoric acid-activated fly ash geopolymer［J］. Construction and Building Materials, 2023, 374: 130920.

[61] [61] PU S Y, ZHU Z D, SONG W L, et al. A eco-friendly acid fly ash geopolymer with a higher strength［J］. Construction and Building Materials, 2022, 335: 127450.

[62] [62] WANG Y S, ALREFAEI Y, DAI J G. Improvement of early-age properties of silico-aluminophosphate geopolymer using dead burnt magnesia［J］. Construction and Building Materials, 2019, 217: 1-11.

[63] [63] CELERIER H, JOUIN J, MATHIVET V, et al. Composition and properties of phosphoric acid-based geopolymers［J］. Journal of Non-Crystalline Solids, 2018, 493: 94-98.

[64] [64] ZAHID M, SHAFIQ N, NURUDDIN M F, et al. Effect of partial replacement of fly ash by metakaolin on strength development of fly ash based geopolymer mortar［J］. Key Engineering Materials, 2017, 744: 131-135.

[65] [65] ZHANG B F, GUO H Z, YUAN P, et al. Novel acid-based geopolymer synthesized from nanosized tubular halloysite: the role of precalcination temperature and phosphoric acid concentration［J］. Cement and Concrete Composites, 2020, 110: 103601.

[66] [66] WANG M R, JIA D C, HE P G, et al. Influence of calcination temperature of kaolin on the structure and properties of final geopolymer［J］. Materials Letters, 2010, 64(22): 2551-2554.

[67] [67] DEROUICHE R, BAKLOUTI S. Phosphoric acid based geopolymerization: effect of the mechanochemical and the thermal activation of the kaolin［J］. Ceramics International, 2021, 47(10): 13446-13456.

[70] [70] MATHIVET V, JOUIN J, PARLIER M, et al. Control of the alumino-silico-phosphate geopolymers properties and structures by the phosphorus concentration［J］. Materials Chemistry and Physics, 2021, 258: 123867.

[71] [71] ZRIBI M, SAMET B, BAKLOUTI S. Mechanical, microstructural and structural investigation of phosphate-based geopolymers with respect to P/Al molar ratio［J］. Journal of Solid State Chemistry, 2020, 281: 121025.

[72] [72] LOUATI S, HAJJAJI W, BAKLOUTI S, et al. Structure and properties of new eco-material obtained by phosphoric acid attack of natural Tunisian clay［J］. Applied Clay Science, 2014, 101: 60-67.

[77] [77] KAZE C R, LECOMTE-NANA G L, KAMSEU E, et al. Mechanical and physical properties of inorganic polymer cement made of iron-rich laterite and lateritic clay: a comparative study［J］. Cement and Concrete Research, 2021, 140: 106320.

[78] [78] DJOBO J N Y, STEPHAN D. The reaction of calcium during the formation of metakaolin phosphate geopolymer binder［J］. Cement and Concrete Research, 2022, 158: 106840.

[79] [79] LI J C, SUN Z G, WANG L, et al. Properties and mechanism of high-magnesium nickel slag-fly ash based geopolymer activated by phosphoric acid［J］. Construction and Building Materials, 2022, 345: 128256.

[80] [80] WAGH A S, JEONG S Y. Chemically bonded phosphate ceramics: I, a dissolution model of formation［J］. Journal of the American Ceramic Society, 2003, 86(11): 1838-1844.

[81] [81] CHERKI EL IDRISSI A, ROZIERE E, LOUKILI A, et al. Design of geopolymer grouts: the effects of water content and mineral precursor［J］. European Journal of Environmental and Civil Engineering, 2018, 22(5): 628-649.

[82] [82] NG Y S, LIEW Y M, HEAH C Y, et al. Improvements of flexural properties and thermal performance in thin geopolymer based on fly ash and ladle furnace slag using borax decahydrates［J］. Materials, 2022, 15(12): 4178.

[83] [83] LIU H J, SANJAYAN J G, BU Y H. The application of sodium hydroxide and anhydrous borax as composite activator of class F fly ash for extending setting time［J］. Fuel, 2017, 206: 534-540.

[84] [84] NUAKLONG P, JANPRASIT K, JONGVIVATSAKUL P. Enhancement of strengths of high-calcium fly ash geopolymer containing borax with rice husk ash［J］. Journal of Building Engineering, 2021, 40: 102762.

[86] [86] YU C Q, YU Y R, ZHAO Y M, et al. Mechanical properties and in situ fracture behavior of SiO2f/phosphate geopolymer composites［J］. Rare Metals, 2020, 39(5): 562-569.

[87] [87] HE P G, JIA L Y, MA G R, et al. Effects of fiber contents on the mechanical and microwave absorbent properties of carbon fiber felt reinforced geopolymer composites［J］. Ceramics International, 2018, 44(9): 10726-10734.

[88] [88] DING Z, LU C, CUI P, et al. Primal study on mechanical properties of phosphate based geopolymer［J］. Key Engineering Materials, 2017, 726: 490-494.