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Improvement of early-age properties of silico-aluminophosphate geopolymer using dead burnt magnesia
https://orcid.org/0000-0001-9904-7914
Highlights An acid-base reaction was introduced during the formation of silico-aluminophosphate (SAP) geopolymer. This acid-base reaction was realized through addition of dead burnt magnesia (DBM). The DMB-SAP geopolymer could achieve enhanced early-age properties including the setting time and strength. The Mg/Al ratio is the critical influencing factor.
Abstract This paper proposes the induction of an acid-base reaction during the formation of silico-aluminophosphate (SAP) geopolymer. Such reaction is promoted by dead burnt magnesia (DBM) and phosphate activating solution to synthesize a DBM-doped silico-aluminophosphate (DBM-SAP) geopolymer with enhanced early-age properties. The reaction mechanisms and chemistries between DBM and mono-aluminum phosphate (MAP) in aqueous solution were firstly investigated at four Mg/Al ratios. Conductivity and pH evolutions of the solution systems, in addition to X-ray diffraction (XRD) and scanning electron microscopy (SEM) results of the final precipitations indicated that the crystalline phase (i.e., Newberyite) started to precipitate at a pH of 3 approximately. Besides, the reaction between DBM and MAP produced an amorphous aluminum magnesium phosphate (Al2O3·3MgO·2P2O5) phase. The rate of such reaction was governed by the DBM/MAP ratio in the solution system. Setting time and early strength of the DBM-SAP geopolymer pastes with an optimal Mg/Al ratio (i.e., 4) in solution system were evaluated to confirm the acceleration effect of DBM-induced acid-base reaction. Experimental results showed that 20% incorporation of DBM enabled the preparation of an SAP geopolymer with an initial setting time of 8 min and 1 day compressive strength of 8.3 MPa. Phosphorrösslerite was detected in the 1d-cured geopolymer paste but disappeared after 3 days curing. Such reaction intermediate might contribute to the fast setting and achieving early strength.
Improvement of early-age properties of silico-aluminophosphate geopolymer using dead burnt magnesia
https://orcid.org/0000-0001-9904-7914
Highlights An acid-base reaction was introduced during the formation of silico-aluminophosphate (SAP) geopolymer. This acid-base reaction was realized through addition of dead burnt magnesia (DBM). The DMB-SAP geopolymer could achieve enhanced early-age properties including the setting time and strength. The Mg/Al ratio is the critical influencing factor.
Abstract This paper proposes the induction of an acid-base reaction during the formation of silico-aluminophosphate (SAP) geopolymer. Such reaction is promoted by dead burnt magnesia (DBM) and phosphate activating solution to synthesize a DBM-doped silico-aluminophosphate (DBM-SAP) geopolymer with enhanced early-age properties. The reaction mechanisms and chemistries between DBM and mono-aluminum phosphate (MAP) in aqueous solution were firstly investigated at four Mg/Al ratios. Conductivity and pH evolutions of the solution systems, in addition to X-ray diffraction (XRD) and scanning electron microscopy (SEM) results of the final precipitations indicated that the crystalline phase (i.e., Newberyite) started to precipitate at a pH of 3 approximately. Besides, the reaction between DBM and MAP produced an amorphous aluminum magnesium phosphate (Al2O3·3MgO·2P2O5) phase. The rate of such reaction was governed by the DBM/MAP ratio in the solution system. Setting time and early strength of the DBM-SAP geopolymer pastes with an optimal Mg/Al ratio (i.e., 4) in solution system were evaluated to confirm the acceleration effect of DBM-induced acid-base reaction. Experimental results showed that 20% incorporation of DBM enabled the preparation of an SAP geopolymer with an initial setting time of 8 min and 1 day compressive strength of 8.3 MPa. Phosphorrösslerite was detected in the 1d-cured geopolymer paste but disappeared after 3 days curing. Such reaction intermediate might contribute to the fast setting and achieving early strength.
Improvement of early-age properties of silico-aluminophosphate geopolymer using dead burnt magnesia
https://orcid.org/0000-0001-9904-7914
Highlights An acid-base reaction was introduced during the formation of silico-aluminophosphate (SAP) geopolymer. This acid-base reaction was realized through addition of dead burnt magnesia (DBM). The DMB-SAP geopolymer could achieve enhanced early-age properties including the setting time and strength. The Mg/Al ratio is the critical influencing factor.
Abstract This paper proposes the induction of an acid-base reaction during the formation of silico-aluminophosphate (SAP) geopolymer. Such reaction is promoted by dead burnt magnesia (DBM) and phosphate activating solution to synthesize a DBM-doped silico-aluminophosphate (DBM-SAP) geopolymer with enhanced early-age properties. The reaction mechanisms and chemistries between DBM and mono-aluminum phosphate (MAP) in aqueous solution were firstly investigated at four Mg/Al ratios. Conductivity and pH evolutions of the solution systems, in addition to X-ray diffraction (XRD) and scanning electron microscopy (SEM) results of the final precipitations indicated that the crystalline phase (i.e., Newberyite) started to precipitate at a pH of 3 approximately. Besides, the reaction between DBM and MAP produced an amorphous aluminum magnesium phosphate (Al2O3·3MgO·2P2O5) phase. The rate of such reaction was governed by the DBM/MAP ratio in the solution system. Setting time and early strength of the DBM-SAP geopolymer pastes with an optimal Mg/Al ratio (i.e., 4) in solution system were evaluated to confirm the acceleration effect of DBM-induced acid-base reaction. Experimental results showed that 20% incorporation of DBM enabled the preparation of an SAP geopolymer with an initial setting time of 8 min and 1 day compressive strength of 8.3 MPa. Phosphorrösslerite was detected in the 1d-cured geopolymer paste but disappeared after 3 days curing. Such reaction intermediate might contribute to the fast setting and achieving early strength.
Improvement of early-age properties of silico-aluminophosphate geopolymer using dead burnt magnesia
Wang, Yan-Shuai (author) / Alrefaei, Yazan (author) / Dai, Jian-Guo (author)
Construction and Building Materials ; 217 ; 1-11
2019-05-07
11 pages
Article (Journal)
Electronic Resource
English
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