Response Surface Optimization of Compressive Strength for Fluorogypsum-Based Cementitious Materials under Multi-Factor Interactive Effects
DOI:
https://doi.org/10.54097/a6qw5350Keywords:
Fluorogypsum, Response surface methodology, Compressive strengthAbstract
The massive accumulation of fluorogypsum (FG) poses severe environmental challenges. To address the limitations of previous single-factor studies, this research employed the Box-Behnken design and response surface methodology (BBD-RSM) to investigate the interactive effects of FG, ground granulated blast-furnace slag (GGBS), and sodium sulfate (Na₂SO₄) on the compressive strength of a novel solid waste-based cementitious material. Analysis of variance confirmed the high fitting accuracy of the established quadratic regression model. Results indicated that the significance of factors on compressive strength ranks as: GGBS > FG > Na₂SO₄. The optimal mix proportion for maximizing compressive strength was determined as 65.39% FG, 15% GGBS, 14.61% fly ash (FA), and 5% ordinary Portland cement (OPC), with an external addition of 1.47% Na₂SO₄. Under this formulation, the measured 28-day compressive strength reached 36.51 MPa, yielding a relative error of only 1.4% compared to the predicted value. This study provides robust theoretical guidance for the large-scale application of FG in green building materials.
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