The Influence of Different B2O3 Dosage on the Rheological Properties and Mechanical Properties of Geopolymer Cement Mortar

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Abstract
This article investigates the influence of B2O3 dosage on the rheological properties and mechanical properties of geopolymer cement mortar. The results showed that B2O3 slightly reduced the fluidity of geopolymer cement mortar, whereas the yield stress and plastic viscosity of geopolymer cement mortar increased with the increase of B2O3 dosage, besides the thixotropy of geopolymer cement mortar also increased. Moreover, the appropriate amount of B2O3 was found to improve the mechanical properties of the 3, 7 days geopolymer cement mortar. Compared to the specimen without B2O3, with 1 wt. % B2O3 geopolymer cement mortar, the 3, 7 days flexural strengths were increased by 18.15 % and 15.03 %, the 3, 7 days compressive strength were increased by 4.95 % and 11.28 %, respectively. Furthermore, infrared spectrum analysis indicated that the formation and propagation of the amorphous aluminosilicate gel phase were improved, which can explain the improvement in the mechanical strength with the incorporation of B2O3. Hence, it is found that the incorporation of B2O3 particles can enhance the rheological properties and mechanical properties of geopolymer cement mortar.

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