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Abstract In this paper, cement, slag, fly ash, and silica fume were used as raw materials to prepare multi-component solid waste cementitious materials in the form of alkali activation. Solid sodium silicate, solid NaOH, gypsum, aluminum sulfate and calcium hydroxide were used as activators to study the effect of activator dosage on the flexural and compressive strength of multi-component solid waste cementitious material mortar. The results show that when Na2O content of solid sodium silicate is 10% and modulus is 1.00, the performance of the cementitious material reaches the optimum, with a 28 day flexural strength of 6.5 MPa and compressive strength of 34.8 MPa. The optimal NaOH content is 10%, with a 28 day flexural strength of 4.0 MPa and a compressive strength of 18.0 MPa. The samples did not set and harden in 3 days at any amount of aluminum sulfate. The optimal dosage of calcium hydroxide is 8%, with a 28 day flexural strength of 6.1 MPa and a compressive strength of 28.3 MPa. The optimal gypsum content is 10%, with a 28 day flexural strength of 7.8 MPa and a compressive strength of 44.0 MPa, which meets the strength index of 42.5 Portland cement.
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Published: 23 January 2025
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2025, Vol. 0 
